Variable littoral‐pelagic coupling as a food‐web response to seasonal changes in pelagic primary production
Lakes are among the most seasonally forced ecosystems on Earth. Seasonal variation in temperature and light produce cyclic patterns in water column mixing, nutrient supply and phytoplankton biomass. Diet responses of consumers to these patterns have rarely been quantified. Moreover, pelagic‐littoral...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Stewart, Simon D [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2017 |
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| Rechteinformationen: |
Nutzungsrecht: © 2017 John Wiley & Sons Ltd |
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| Schlagwörter: |
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| Übergeordnetes Werk: |
Enthalten in: Freshwater biology - Oxford : Wiley-Blackwell, 1971, 62(2017), 12, Seite 2008-2025 |
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| Übergeordnetes Werk: |
volume:62 ; year:2017 ; number:12 ; pages:2008-2025 |
| Links: |
|---|
| DOI / URN: |
10.1111/fwb.13046 |
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| Katalog-ID: |
OLC1998998584 |
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| 245 | 1 | 0 | |a Variable littoral‐pelagic coupling as a food‐web response to seasonal changes in pelagic primary production |
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| 520 | |a Lakes are among the most seasonally forced ecosystems on Earth. Seasonal variation in temperature and light produce cyclic patterns in water column mixing, nutrient supply and phytoplankton biomass. Diet responses of consumers to these patterns have rarely been quantified. Moreover, pelagic‐littoral coupling of dietary resources by mobile consumers is commonly considered to be static over annual cycles. This study quantifies littoral‐pelagic diet responses of multiple consumers to a strong shift in pelagic phytoplankton abundance over an annual cycle (September 2014 to August 2015) in a large (area 614 km 2 ), oligotrophic, monomictic lake (Lake Taupō, New Zealand). Intra‐annual patterns in pelagic phytoplankton (chlorophyll a ) and zooplankton were determined over multiple years. Major resource and consumer δ 13 C and δ 15 N were then collected over an annual cycle. Temporal patterns in food‐web structure were examined using convex hulls as a proxy of community trophic niche size. Diet was quantified using mixing models for zooplankton, meso‐predatory zooplanktivorous common smelt ( Retropinna retropinna ) and benthivorous common bullies ( Gobiomorphus cotidianus ), as well as the top‐predator rainbow trout ( Oncorhynchus mykiss ). Trophic structure patterns for smelt, bullies and trout were then independently examined using compound‐specific amino acid δ 15 N analyses ( CSIA ‐ AA ). Lake Taupō demonstrated similar food‐web patterns to other lakes globally. Phytoplankton and zooplankton demonstrated strong seasonal oscillations of abundance driven by both bottom‐up (nutrient supply) and top‐down (stable limit cycle) drivers. The food web demonstrated the typical nested structure. It responded to seasonally low and high pelagic resource availability periods by expansion and contraction, respectively, of trophic niche space. In response to lower pelagic phytoplankton abundance during summer stratification, and phytoplankton accumulation at a deep chlorophyll maximum ( DCM ), zooplankton abundance reduced and their diet became dominated by phytoplankton from below the thermocline (i.e. the hypolimnion and DCM ). This change may have been prompted by the combined drivers of avoidance of predation and depauperate food supply in surface waters. The diet of smelt and bullies switched from predominantly zooplankton to benthic macroinvertebrates, synchronous with the decline in pelagic zooplankton. Trout diet, inferred from comparison of isotopic signatures of tissues with different turnover rates, also increased littoral resource reliance over the stratified period. Smelt, bully and trout CSIA ‐ AA data confirmed estimates of trophic position and indicated a greater degree of trophic complexity in the littoral than the pelagic food chain. Food webs in large, deep lakes such as Taupō are expected to be primarily pelagic. This study demonstrates the need to re‐examine this expectation due to seasonal variations in productivity. The relatively small littoral areas in large lakes, combined with meso‐predators’ highly seasonally variable littoral resource use, may drive strong seasonal top‐down effects on littoral macroinvertebrate prey. Our study supports the notion that food‐web interactions are highly dynamic and responsive to seasonal forcing. By linking food‐web dynamics to dynamic environmental conditions, this study provides a framework for future studies research on understanding lake food‐web responses to a range of annual/seasonal and global environmental change drivers. | ||
| 540 | |a Nutzungsrecht: © 2017 John Wiley & Sons Ltd | ||
| 650 | 4 | |a lakes | |
| 650 | 4 | |a secondary production | |
| 650 | 4 | |a primary production | |
| 650 | 4 | |a food webs | |
| 650 | 4 | |a pelagic | |
| 650 | 4 | |a stable isotopes | |
| 650 | 4 | |a Tissues | |
| 650 | 4 | |a Chlorophyll | |
| 650 | 4 | |a Food chains | |
| 650 | 4 | |a Ecosystems | |
| 650 | 4 | |a Niches | |
| 650 | 4 | |a Predation | |
| 650 | 4 | |a Abundance | |
| 650 | 4 | |a Phytoplankton | |
| 650 | 4 | |a Nutrients | |
| 650 | 4 | |a Macroinvertebrates | |
| 650 | 4 | |a Primary production | |
| 650 | 4 | |a Nutrient cycles | |
| 650 | 4 | |a Water column | |
| 650 | 4 | |a Columns (structural) | |
| 650 | 4 | |a Lakes | |
| 650 | 4 | |a Consumers | |
| 650 | 4 | |a Seasonal variations | |
| 650 | 4 | |a Hypolimnion | |
| 650 | 4 | |a Salmon | |
| 650 | 4 | |a Diets | |
| 650 | 4 | |a Hulls (structures) | |
| 650 | 4 | |a Amino acids | |
| 650 | 4 | |a Interactions | |
| 650 | 4 | |a Zooplankton | |
| 650 | 4 | |a Littoral environments | |
| 650 | 4 | |a Hulls | |
| 650 | 4 | |a Water temperature | |
| 650 | 4 | |a Annual cycles | |
| 650 | 4 | |a Aquatic ecosystems | |
| 650 | 4 | |a Convexity | |
| 650 | 4 | |a Trout | |
| 650 | 4 | |a Seasons | |
| 650 | 4 | |a Environmental changes | |
| 650 | 4 | |a Nutrients (mineral) | |
| 650 | 4 | |a Diet | |
| 650 | 4 | |a Thermocline | |
| 650 | 4 | |a Plankton | |
| 650 | 4 | |a Bullying | |
| 650 | 4 | |a Oscillations | |
| 650 | 4 | |a Surface water | |
| 650 | 4 | |a Food | |
| 650 | 4 | |a Resource availability | |
| 650 | 4 | |a Contraction | |
| 650 | 4 | |a Food chain | |
| 650 | 4 | |a Predators | |
| 650 | 4 | |a Stratification | |
| 650 | 4 | |a Interspecific relationships | |
| 650 | 4 | |a Prey | |
| 650 | 4 | |a Food webs | |
| 650 | 4 | |a Food supply | |
| 650 | 4 | |a Annual variations | |
| 650 | 4 | |a Framework | |
| 650 | 4 | |a Dynamics | |
| 650 | 4 | |a Coupling | |
| 650 | 4 | |a Zoobenthos | |
| 650 | 4 | |a Environmental conditions | |
| 700 | 1 | |a Hamilton, David P |4 oth | |
| 700 | 1 | |a Baisden, W. Troy |4 oth | |
| 700 | 1 | |a Dedual, Michel |4 oth | |
| 700 | 1 | |a Verburg, Piet |4 oth | |
| 700 | 1 | |a Duggan, Ian C |4 oth | |
| 700 | 1 | |a Hicks, Brendan J |4 oth | |
| 700 | 1 | |a Graham, Brittany S |4 oth | |
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| 773 | 1 | 8 | |g volume:62 |g year:2017 |g number:12 |g pages:2008-2025 |
| 856 | 4 | 1 | |u http://dx.doi.org/10.1111/fwb.13046 |3 Volltext |
| 856 | 4 | 2 | |u http://onlinelibrary.wiley.com/doi/10.1111/fwb.13046/abstract |
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10.1111/fwb.13046 doi PQ20171228 (DE-627)OLC1998998584 (DE-599)GBVOLC1998998584 (PRQ)p976-6d23ea4cf3aa5602eb64abd61964e0b1b1a5b56e7f727cc0a20d5c9560be53e40 (KEY)0056936420170000062001202008variablelittoralpelagiccouplingasafoodwebresponset DE-627 ger DE-627 rakwb eng 570 DNB BIODIV fid 42.00 bkl Stewart, Simon D verfasserin aut Variable littoral‐pelagic coupling as a food‐web response to seasonal changes in pelagic primary production 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Lakes are among the most seasonally forced ecosystems on Earth. Seasonal variation in temperature and light produce cyclic patterns in water column mixing, nutrient supply and phytoplankton biomass. Diet responses of consumers to these patterns have rarely been quantified. Moreover, pelagic‐littoral coupling of dietary resources by mobile consumers is commonly considered to be static over annual cycles. This study quantifies littoral‐pelagic diet responses of multiple consumers to a strong shift in pelagic phytoplankton abundance over an annual cycle (September 2014 to August 2015) in a large (area 614 km 2 ), oligotrophic, monomictic lake (Lake Taupō, New Zealand). Intra‐annual patterns in pelagic phytoplankton (chlorophyll a ) and zooplankton were determined over multiple years. Major resource and consumer δ 13 C and δ 15 N were then collected over an annual cycle. Temporal patterns in food‐web structure were examined using convex hulls as a proxy of community trophic niche size. Diet was quantified using mixing models for zooplankton, meso‐predatory zooplanktivorous common smelt ( Retropinna retropinna ) and benthivorous common bullies ( Gobiomorphus cotidianus ), as well as the top‐predator rainbow trout ( Oncorhynchus mykiss ). Trophic structure patterns for smelt, bullies and trout were then independently examined using compound‐specific amino acid δ 15 N analyses ( CSIA ‐ AA ). Lake Taupō demonstrated similar food‐web patterns to other lakes globally. Phytoplankton and zooplankton demonstrated strong seasonal oscillations of abundance driven by both bottom‐up (nutrient supply) and top‐down (stable limit cycle) drivers. The food web demonstrated the typical nested structure. It responded to seasonally low and high pelagic resource availability periods by expansion and contraction, respectively, of trophic niche space. In response to lower pelagic phytoplankton abundance during summer stratification, and phytoplankton accumulation at a deep chlorophyll maximum ( DCM ), zooplankton abundance reduced and their diet became dominated by phytoplankton from below the thermocline (i.e. the hypolimnion and DCM ). This change may have been prompted by the combined drivers of avoidance of predation and depauperate food supply in surface waters. The diet of smelt and bullies switched from predominantly zooplankton to benthic macroinvertebrates, synchronous with the decline in pelagic zooplankton. Trout diet, inferred from comparison of isotopic signatures of tissues with different turnover rates, also increased littoral resource reliance over the stratified period. Smelt, bully and trout CSIA ‐ AA data confirmed estimates of trophic position and indicated a greater degree of trophic complexity in the littoral than the pelagic food chain. Food webs in large, deep lakes such as Taupō are expected to be primarily pelagic. This study demonstrates the need to re‐examine this expectation due to seasonal variations in productivity. The relatively small littoral areas in large lakes, combined with meso‐predators’ highly seasonally variable littoral resource use, may drive strong seasonal top‐down effects on littoral macroinvertebrate prey. Our study supports the notion that food‐web interactions are highly dynamic and responsive to seasonal forcing. By linking food‐web dynamics to dynamic environmental conditions, this study provides a framework for future studies research on understanding lake food‐web responses to a range of annual/seasonal and global environmental change drivers. Nutzungsrecht: © 2017 John Wiley & Sons Ltd lakes secondary production primary production food webs pelagic stable isotopes Tissues Chlorophyll Food chains Ecosystems Niches Predation Abundance Phytoplankton Nutrients Macroinvertebrates Primary production Nutrient cycles Water column Columns (structural) Lakes Consumers Seasonal variations Hypolimnion Salmon Diets Hulls (structures) Amino acids Interactions Zooplankton Littoral environments Hulls Water temperature Annual cycles Aquatic ecosystems Convexity Trout Seasons Environmental changes Nutrients (mineral) Diet Thermocline Plankton Bullying Oscillations Surface water Food Resource availability Contraction Food chain Predators Stratification Interspecific relationships Prey Food webs Food supply Annual variations Framework Dynamics Coupling Zoobenthos Environmental conditions Hamilton, David P oth Baisden, W. Troy oth Dedual, Michel oth Verburg, Piet oth Duggan, Ian C oth Hicks, Brendan J oth Graham, Brittany S oth Enthalten in Freshwater biology Oxford : Wiley-Blackwell, 1971 62(2017), 12, Seite 2008-2025 (DE-627)129295906 (DE-600)121180-8 (DE-576)014489139 0046-5070 nnns volume:62 year:2017 number:12 pages:2008-2025 http://dx.doi.org/10.1111/fwb.13046 Volltext http://onlinelibrary.wiley.com/doi/10.1111/fwb.13046/abstract https://search.proquest.com/docview/1962042239 GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-UMW SSG-OLC-TEC SSG-OLC-PHA SSG-OLC-DE-84 42.00 AVZ AR 62 2017 12 2008-2025 |
| spelling |
10.1111/fwb.13046 doi PQ20171228 (DE-627)OLC1998998584 (DE-599)GBVOLC1998998584 (PRQ)p976-6d23ea4cf3aa5602eb64abd61964e0b1b1a5b56e7f727cc0a20d5c9560be53e40 (KEY)0056936420170000062001202008variablelittoralpelagiccouplingasafoodwebresponset DE-627 ger DE-627 rakwb eng 570 DNB BIODIV fid 42.00 bkl Stewart, Simon D verfasserin aut Variable littoral‐pelagic coupling as a food‐web response to seasonal changes in pelagic primary production 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Lakes are among the most seasonally forced ecosystems on Earth. Seasonal variation in temperature and light produce cyclic patterns in water column mixing, nutrient supply and phytoplankton biomass. Diet responses of consumers to these patterns have rarely been quantified. Moreover, pelagic‐littoral coupling of dietary resources by mobile consumers is commonly considered to be static over annual cycles. This study quantifies littoral‐pelagic diet responses of multiple consumers to a strong shift in pelagic phytoplankton abundance over an annual cycle (September 2014 to August 2015) in a large (area 614 km 2 ), oligotrophic, monomictic lake (Lake Taupō, New Zealand). Intra‐annual patterns in pelagic phytoplankton (chlorophyll a ) and zooplankton were determined over multiple years. Major resource and consumer δ 13 C and δ 15 N were then collected over an annual cycle. Temporal patterns in food‐web structure were examined using convex hulls as a proxy of community trophic niche size. Diet was quantified using mixing models for zooplankton, meso‐predatory zooplanktivorous common smelt ( Retropinna retropinna ) and benthivorous common bullies ( Gobiomorphus cotidianus ), as well as the top‐predator rainbow trout ( Oncorhynchus mykiss ). Trophic structure patterns for smelt, bullies and trout were then independently examined using compound‐specific amino acid δ 15 N analyses ( CSIA ‐ AA ). Lake Taupō demonstrated similar food‐web patterns to other lakes globally. Phytoplankton and zooplankton demonstrated strong seasonal oscillations of abundance driven by both bottom‐up (nutrient supply) and top‐down (stable limit cycle) drivers. The food web demonstrated the typical nested structure. It responded to seasonally low and high pelagic resource availability periods by expansion and contraction, respectively, of trophic niche space. In response to lower pelagic phytoplankton abundance during summer stratification, and phytoplankton accumulation at a deep chlorophyll maximum ( DCM ), zooplankton abundance reduced and their diet became dominated by phytoplankton from below the thermocline (i.e. the hypolimnion and DCM ). This change may have been prompted by the combined drivers of avoidance of predation and depauperate food supply in surface waters. The diet of smelt and bullies switched from predominantly zooplankton to benthic macroinvertebrates, synchronous with the decline in pelagic zooplankton. Trout diet, inferred from comparison of isotopic signatures of tissues with different turnover rates, also increased littoral resource reliance over the stratified period. Smelt, bully and trout CSIA ‐ AA data confirmed estimates of trophic position and indicated a greater degree of trophic complexity in the littoral than the pelagic food chain. Food webs in large, deep lakes such as Taupō are expected to be primarily pelagic. This study demonstrates the need to re‐examine this expectation due to seasonal variations in productivity. The relatively small littoral areas in large lakes, combined with meso‐predators’ highly seasonally variable littoral resource use, may drive strong seasonal top‐down effects on littoral macroinvertebrate prey. Our study supports the notion that food‐web interactions are highly dynamic and responsive to seasonal forcing. By linking food‐web dynamics to dynamic environmental conditions, this study provides a framework for future studies research on understanding lake food‐web responses to a range of annual/seasonal and global environmental change drivers. Nutzungsrecht: © 2017 John Wiley & Sons Ltd lakes secondary production primary production food webs pelagic stable isotopes Tissues Chlorophyll Food chains Ecosystems Niches Predation Abundance Phytoplankton Nutrients Macroinvertebrates Primary production Nutrient cycles Water column Columns (structural) Lakes Consumers Seasonal variations Hypolimnion Salmon Diets Hulls (structures) Amino acids Interactions Zooplankton Littoral environments Hulls Water temperature Annual cycles Aquatic ecosystems Convexity Trout Seasons Environmental changes Nutrients (mineral) Diet Thermocline Plankton Bullying Oscillations Surface water Food Resource availability Contraction Food chain Predators Stratification Interspecific relationships Prey Food webs Food supply Annual variations Framework Dynamics Coupling Zoobenthos Environmental conditions Hamilton, David P oth Baisden, W. Troy oth Dedual, Michel oth Verburg, Piet oth Duggan, Ian C oth Hicks, Brendan J oth Graham, Brittany S oth Enthalten in Freshwater biology Oxford : Wiley-Blackwell, 1971 62(2017), 12, Seite 2008-2025 (DE-627)129295906 (DE-600)121180-8 (DE-576)014489139 0046-5070 nnns volume:62 year:2017 number:12 pages:2008-2025 http://dx.doi.org/10.1111/fwb.13046 Volltext http://onlinelibrary.wiley.com/doi/10.1111/fwb.13046/abstract https://search.proquest.com/docview/1962042239 GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-UMW SSG-OLC-TEC SSG-OLC-PHA SSG-OLC-DE-84 42.00 AVZ AR 62 2017 12 2008-2025 |
| allfields_unstemmed |
10.1111/fwb.13046 doi PQ20171228 (DE-627)OLC1998998584 (DE-599)GBVOLC1998998584 (PRQ)p976-6d23ea4cf3aa5602eb64abd61964e0b1b1a5b56e7f727cc0a20d5c9560be53e40 (KEY)0056936420170000062001202008variablelittoralpelagiccouplingasafoodwebresponset DE-627 ger DE-627 rakwb eng 570 DNB BIODIV fid 42.00 bkl Stewart, Simon D verfasserin aut Variable littoral‐pelagic coupling as a food‐web response to seasonal changes in pelagic primary production 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Lakes are among the most seasonally forced ecosystems on Earth. Seasonal variation in temperature and light produce cyclic patterns in water column mixing, nutrient supply and phytoplankton biomass. Diet responses of consumers to these patterns have rarely been quantified. Moreover, pelagic‐littoral coupling of dietary resources by mobile consumers is commonly considered to be static over annual cycles. This study quantifies littoral‐pelagic diet responses of multiple consumers to a strong shift in pelagic phytoplankton abundance over an annual cycle (September 2014 to August 2015) in a large (area 614 km 2 ), oligotrophic, monomictic lake (Lake Taupō, New Zealand). Intra‐annual patterns in pelagic phytoplankton (chlorophyll a ) and zooplankton were determined over multiple years. Major resource and consumer δ 13 C and δ 15 N were then collected over an annual cycle. Temporal patterns in food‐web structure were examined using convex hulls as a proxy of community trophic niche size. Diet was quantified using mixing models for zooplankton, meso‐predatory zooplanktivorous common smelt ( Retropinna retropinna ) and benthivorous common bullies ( Gobiomorphus cotidianus ), as well as the top‐predator rainbow trout ( Oncorhynchus mykiss ). Trophic structure patterns for smelt, bullies and trout were then independently examined using compound‐specific amino acid δ 15 N analyses ( CSIA ‐ AA ). Lake Taupō demonstrated similar food‐web patterns to other lakes globally. Phytoplankton and zooplankton demonstrated strong seasonal oscillations of abundance driven by both bottom‐up (nutrient supply) and top‐down (stable limit cycle) drivers. The food web demonstrated the typical nested structure. It responded to seasonally low and high pelagic resource availability periods by expansion and contraction, respectively, of trophic niche space. In response to lower pelagic phytoplankton abundance during summer stratification, and phytoplankton accumulation at a deep chlorophyll maximum ( DCM ), zooplankton abundance reduced and their diet became dominated by phytoplankton from below the thermocline (i.e. the hypolimnion and DCM ). This change may have been prompted by the combined drivers of avoidance of predation and depauperate food supply in surface waters. The diet of smelt and bullies switched from predominantly zooplankton to benthic macroinvertebrates, synchronous with the decline in pelagic zooplankton. Trout diet, inferred from comparison of isotopic signatures of tissues with different turnover rates, also increased littoral resource reliance over the stratified period. Smelt, bully and trout CSIA ‐ AA data confirmed estimates of trophic position and indicated a greater degree of trophic complexity in the littoral than the pelagic food chain. Food webs in large, deep lakes such as Taupō are expected to be primarily pelagic. This study demonstrates the need to re‐examine this expectation due to seasonal variations in productivity. The relatively small littoral areas in large lakes, combined with meso‐predators’ highly seasonally variable littoral resource use, may drive strong seasonal top‐down effects on littoral macroinvertebrate prey. Our study supports the notion that food‐web interactions are highly dynamic and responsive to seasonal forcing. By linking food‐web dynamics to dynamic environmental conditions, this study provides a framework for future studies research on understanding lake food‐web responses to a range of annual/seasonal and global environmental change drivers. Nutzungsrecht: © 2017 John Wiley & Sons Ltd lakes secondary production primary production food webs pelagic stable isotopes Tissues Chlorophyll Food chains Ecosystems Niches Predation Abundance Phytoplankton Nutrients Macroinvertebrates Primary production Nutrient cycles Water column Columns (structural) Lakes Consumers Seasonal variations Hypolimnion Salmon Diets Hulls (structures) Amino acids Interactions Zooplankton Littoral environments Hulls Water temperature Annual cycles Aquatic ecosystems Convexity Trout Seasons Environmental changes Nutrients (mineral) Diet Thermocline Plankton Bullying Oscillations Surface water Food Resource availability Contraction Food chain Predators Stratification Interspecific relationships Prey Food webs Food supply Annual variations Framework Dynamics Coupling Zoobenthos Environmental conditions Hamilton, David P oth Baisden, W. Troy oth Dedual, Michel oth Verburg, Piet oth Duggan, Ian C oth Hicks, Brendan J oth Graham, Brittany S oth Enthalten in Freshwater biology Oxford : Wiley-Blackwell, 1971 62(2017), 12, Seite 2008-2025 (DE-627)129295906 (DE-600)121180-8 (DE-576)014489139 0046-5070 nnns volume:62 year:2017 number:12 pages:2008-2025 http://dx.doi.org/10.1111/fwb.13046 Volltext http://onlinelibrary.wiley.com/doi/10.1111/fwb.13046/abstract https://search.proquest.com/docview/1962042239 GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-UMW SSG-OLC-TEC SSG-OLC-PHA SSG-OLC-DE-84 42.00 AVZ AR 62 2017 12 2008-2025 |
| allfieldsGer |
10.1111/fwb.13046 doi PQ20171228 (DE-627)OLC1998998584 (DE-599)GBVOLC1998998584 (PRQ)p976-6d23ea4cf3aa5602eb64abd61964e0b1b1a5b56e7f727cc0a20d5c9560be53e40 (KEY)0056936420170000062001202008variablelittoralpelagiccouplingasafoodwebresponset DE-627 ger DE-627 rakwb eng 570 DNB BIODIV fid 42.00 bkl Stewart, Simon D verfasserin aut Variable littoral‐pelagic coupling as a food‐web response to seasonal changes in pelagic primary production 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Lakes are among the most seasonally forced ecosystems on Earth. Seasonal variation in temperature and light produce cyclic patterns in water column mixing, nutrient supply and phytoplankton biomass. Diet responses of consumers to these patterns have rarely been quantified. Moreover, pelagic‐littoral coupling of dietary resources by mobile consumers is commonly considered to be static over annual cycles. This study quantifies littoral‐pelagic diet responses of multiple consumers to a strong shift in pelagic phytoplankton abundance over an annual cycle (September 2014 to August 2015) in a large (area 614 km 2 ), oligotrophic, monomictic lake (Lake Taupō, New Zealand). Intra‐annual patterns in pelagic phytoplankton (chlorophyll a ) and zooplankton were determined over multiple years. Major resource and consumer δ 13 C and δ 15 N were then collected over an annual cycle. Temporal patterns in food‐web structure were examined using convex hulls as a proxy of community trophic niche size. Diet was quantified using mixing models for zooplankton, meso‐predatory zooplanktivorous common smelt ( Retropinna retropinna ) and benthivorous common bullies ( Gobiomorphus cotidianus ), as well as the top‐predator rainbow trout ( Oncorhynchus mykiss ). Trophic structure patterns for smelt, bullies and trout were then independently examined using compound‐specific amino acid δ 15 N analyses ( CSIA ‐ AA ). Lake Taupō demonstrated similar food‐web patterns to other lakes globally. Phytoplankton and zooplankton demonstrated strong seasonal oscillations of abundance driven by both bottom‐up (nutrient supply) and top‐down (stable limit cycle) drivers. The food web demonstrated the typical nested structure. It responded to seasonally low and high pelagic resource availability periods by expansion and contraction, respectively, of trophic niche space. In response to lower pelagic phytoplankton abundance during summer stratification, and phytoplankton accumulation at a deep chlorophyll maximum ( DCM ), zooplankton abundance reduced and their diet became dominated by phytoplankton from below the thermocline (i.e. the hypolimnion and DCM ). This change may have been prompted by the combined drivers of avoidance of predation and depauperate food supply in surface waters. The diet of smelt and bullies switched from predominantly zooplankton to benthic macroinvertebrates, synchronous with the decline in pelagic zooplankton. Trout diet, inferred from comparison of isotopic signatures of tissues with different turnover rates, also increased littoral resource reliance over the stratified period. Smelt, bully and trout CSIA ‐ AA data confirmed estimates of trophic position and indicated a greater degree of trophic complexity in the littoral than the pelagic food chain. Food webs in large, deep lakes such as Taupō are expected to be primarily pelagic. This study demonstrates the need to re‐examine this expectation due to seasonal variations in productivity. The relatively small littoral areas in large lakes, combined with meso‐predators’ highly seasonally variable littoral resource use, may drive strong seasonal top‐down effects on littoral macroinvertebrate prey. Our study supports the notion that food‐web interactions are highly dynamic and responsive to seasonal forcing. By linking food‐web dynamics to dynamic environmental conditions, this study provides a framework for future studies research on understanding lake food‐web responses to a range of annual/seasonal and global environmental change drivers. Nutzungsrecht: © 2017 John Wiley & Sons Ltd lakes secondary production primary production food webs pelagic stable isotopes Tissues Chlorophyll Food chains Ecosystems Niches Predation Abundance Phytoplankton Nutrients Macroinvertebrates Primary production Nutrient cycles Water column Columns (structural) Lakes Consumers Seasonal variations Hypolimnion Salmon Diets Hulls (structures) Amino acids Interactions Zooplankton Littoral environments Hulls Water temperature Annual cycles Aquatic ecosystems Convexity Trout Seasons Environmental changes Nutrients (mineral) Diet Thermocline Plankton Bullying Oscillations Surface water Food Resource availability Contraction Food chain Predators Stratification Interspecific relationships Prey Food webs Food supply Annual variations Framework Dynamics Coupling Zoobenthos Environmental conditions Hamilton, David P oth Baisden, W. Troy oth Dedual, Michel oth Verburg, Piet oth Duggan, Ian C oth Hicks, Brendan J oth Graham, Brittany S oth Enthalten in Freshwater biology Oxford : Wiley-Blackwell, 1971 62(2017), 12, Seite 2008-2025 (DE-627)129295906 (DE-600)121180-8 (DE-576)014489139 0046-5070 nnns volume:62 year:2017 number:12 pages:2008-2025 http://dx.doi.org/10.1111/fwb.13046 Volltext http://onlinelibrary.wiley.com/doi/10.1111/fwb.13046/abstract https://search.proquest.com/docview/1962042239 GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-UMW SSG-OLC-TEC SSG-OLC-PHA SSG-OLC-DE-84 42.00 AVZ AR 62 2017 12 2008-2025 |
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10.1111/fwb.13046 doi PQ20171228 (DE-627)OLC1998998584 (DE-599)GBVOLC1998998584 (PRQ)p976-6d23ea4cf3aa5602eb64abd61964e0b1b1a5b56e7f727cc0a20d5c9560be53e40 (KEY)0056936420170000062001202008variablelittoralpelagiccouplingasafoodwebresponset DE-627 ger DE-627 rakwb eng 570 DNB BIODIV fid 42.00 bkl Stewart, Simon D verfasserin aut Variable littoral‐pelagic coupling as a food‐web response to seasonal changes in pelagic primary production 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Lakes are among the most seasonally forced ecosystems on Earth. Seasonal variation in temperature and light produce cyclic patterns in water column mixing, nutrient supply and phytoplankton biomass. Diet responses of consumers to these patterns have rarely been quantified. Moreover, pelagic‐littoral coupling of dietary resources by mobile consumers is commonly considered to be static over annual cycles. This study quantifies littoral‐pelagic diet responses of multiple consumers to a strong shift in pelagic phytoplankton abundance over an annual cycle (September 2014 to August 2015) in a large (area 614 km 2 ), oligotrophic, monomictic lake (Lake Taupō, New Zealand). Intra‐annual patterns in pelagic phytoplankton (chlorophyll a ) and zooplankton were determined over multiple years. Major resource and consumer δ 13 C and δ 15 N were then collected over an annual cycle. Temporal patterns in food‐web structure were examined using convex hulls as a proxy of community trophic niche size. Diet was quantified using mixing models for zooplankton, meso‐predatory zooplanktivorous common smelt ( Retropinna retropinna ) and benthivorous common bullies ( Gobiomorphus cotidianus ), as well as the top‐predator rainbow trout ( Oncorhynchus mykiss ). Trophic structure patterns for smelt, bullies and trout were then independently examined using compound‐specific amino acid δ 15 N analyses ( CSIA ‐ AA ). Lake Taupō demonstrated similar food‐web patterns to other lakes globally. Phytoplankton and zooplankton demonstrated strong seasonal oscillations of abundance driven by both bottom‐up (nutrient supply) and top‐down (stable limit cycle) drivers. The food web demonstrated the typical nested structure. It responded to seasonally low and high pelagic resource availability periods by expansion and contraction, respectively, of trophic niche space. In response to lower pelagic phytoplankton abundance during summer stratification, and phytoplankton accumulation at a deep chlorophyll maximum ( DCM ), zooplankton abundance reduced and their diet became dominated by phytoplankton from below the thermocline (i.e. the hypolimnion and DCM ). This change may have been prompted by the combined drivers of avoidance of predation and depauperate food supply in surface waters. The diet of smelt and bullies switched from predominantly zooplankton to benthic macroinvertebrates, synchronous with the decline in pelagic zooplankton. Trout diet, inferred from comparison of isotopic signatures of tissues with different turnover rates, also increased littoral resource reliance over the stratified period. Smelt, bully and trout CSIA ‐ AA data confirmed estimates of trophic position and indicated a greater degree of trophic complexity in the littoral than the pelagic food chain. Food webs in large, deep lakes such as Taupō are expected to be primarily pelagic. This study demonstrates the need to re‐examine this expectation due to seasonal variations in productivity. The relatively small littoral areas in large lakes, combined with meso‐predators’ highly seasonally variable littoral resource use, may drive strong seasonal top‐down effects on littoral macroinvertebrate prey. Our study supports the notion that food‐web interactions are highly dynamic and responsive to seasonal forcing. By linking food‐web dynamics to dynamic environmental conditions, this study provides a framework for future studies research on understanding lake food‐web responses to a range of annual/seasonal and global environmental change drivers. Nutzungsrecht: © 2017 John Wiley & Sons Ltd lakes secondary production primary production food webs pelagic stable isotopes Tissues Chlorophyll Food chains Ecosystems Niches Predation Abundance Phytoplankton Nutrients Macroinvertebrates Primary production Nutrient cycles Water column Columns (structural) Lakes Consumers Seasonal variations Hypolimnion Salmon Diets Hulls (structures) Amino acids Interactions Zooplankton Littoral environments Hulls Water temperature Annual cycles Aquatic ecosystems Convexity Trout Seasons Environmental changes Nutrients (mineral) Diet Thermocline Plankton Bullying Oscillations Surface water Food Resource availability Contraction Food chain Predators Stratification Interspecific relationships Prey Food webs Food supply Annual variations Framework Dynamics Coupling Zoobenthos Environmental conditions Hamilton, David P oth Baisden, W. Troy oth Dedual, Michel oth Verburg, Piet oth Duggan, Ian C oth Hicks, Brendan J oth Graham, Brittany S oth Enthalten in Freshwater biology Oxford : Wiley-Blackwell, 1971 62(2017), 12, Seite 2008-2025 (DE-627)129295906 (DE-600)121180-8 (DE-576)014489139 0046-5070 nnns volume:62 year:2017 number:12 pages:2008-2025 http://dx.doi.org/10.1111/fwb.13046 Volltext http://onlinelibrary.wiley.com/doi/10.1111/fwb.13046/abstract https://search.proquest.com/docview/1962042239 GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-UMW SSG-OLC-TEC SSG-OLC-PHA SSG-OLC-DE-84 42.00 AVZ AR 62 2017 12 2008-2025 |
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lakes secondary production primary production food webs pelagic stable isotopes Tissues Chlorophyll Food chains Ecosystems Niches Predation Abundance Phytoplankton Nutrients Macroinvertebrates Primary production Nutrient cycles Water column Columns (structural) Lakes Consumers Seasonal variations Hypolimnion Salmon Diets Hulls (structures) Amino acids Interactions Zooplankton Littoral environments Hulls Water temperature Annual cycles Aquatic ecosystems Convexity Trout Seasons Environmental changes Nutrients (mineral) Diet Thermocline Plankton Bullying Oscillations Surface water Food Resource availability Contraction Food chain Predators Stratification Interspecific relationships Prey Food webs Food supply Annual variations Framework Dynamics Coupling Zoobenthos Environmental conditions |
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Stewart, Simon D @@aut@@ Hamilton, David P @@oth@@ Baisden, W. Troy @@oth@@ Dedual, Michel @@oth@@ Verburg, Piet @@oth@@ Duggan, Ian C @@oth@@ Hicks, Brendan J @@oth@@ Graham, Brittany S @@oth@@ |
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Stewart, Simon D ddc 570 fid BIODIV bkl 42.00 misc lakes misc secondary production misc primary production misc food webs misc pelagic misc stable isotopes misc Tissues misc Chlorophyll misc Food chains misc Ecosystems misc Niches misc Predation misc Abundance misc Phytoplankton misc Nutrients misc Macroinvertebrates misc Primary production misc Nutrient cycles misc Water column misc Columns (structural) misc Lakes misc Consumers misc Seasonal variations misc Hypolimnion misc Salmon misc Diets misc Hulls (structures) misc Amino acids misc Interactions misc Zooplankton misc Littoral environments misc Hulls misc Water temperature misc Annual cycles misc Aquatic ecosystems misc Convexity misc Trout misc Seasons misc Environmental changes misc Nutrients (mineral) misc Diet misc Thermocline misc Plankton misc Bullying misc Oscillations misc Surface water misc Food misc Resource availability misc Contraction misc Food chain misc Predators misc Stratification misc Interspecific relationships misc Prey misc Food webs misc Food supply misc Annual variations misc Framework misc Dynamics misc Coupling misc Zoobenthos misc Environmental conditions Variable littoral‐pelagic coupling as a food‐web response to seasonal changes in pelagic primary production |
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570 DNB BIODIV fid 42.00 bkl Variable littoral‐pelagic coupling as a food‐web response to seasonal changes in pelagic primary production lakes secondary production primary production food webs pelagic stable isotopes Tissues Chlorophyll Food chains Ecosystems Niches Predation Abundance Phytoplankton Nutrients Macroinvertebrates Primary production Nutrient cycles Water column Columns (structural) Lakes Consumers Seasonal variations Hypolimnion Salmon Diets Hulls (structures) Amino acids Interactions Zooplankton Littoral environments Hulls Water temperature Annual cycles Aquatic ecosystems Convexity Trout Seasons Environmental changes Nutrients (mineral) Diet Thermocline Plankton Bullying Oscillations Surface water Food Resource availability Contraction Food chain Predators Stratification Interspecific relationships Prey Food webs Food supply Annual variations Framework Dynamics Coupling Zoobenthos Environmental conditions |
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ddc 570 fid BIODIV bkl 42.00 misc lakes misc secondary production misc primary production misc food webs misc pelagic misc stable isotopes misc Tissues misc Chlorophyll misc Food chains misc Ecosystems misc Niches misc Predation misc Abundance misc Phytoplankton misc Nutrients misc Macroinvertebrates misc Primary production misc Nutrient cycles misc Water column misc Columns (structural) misc Lakes misc Consumers misc Seasonal variations misc Hypolimnion misc Salmon misc Diets misc Hulls (structures) misc Amino acids misc Interactions misc Zooplankton misc Littoral environments misc Hulls misc Water temperature misc Annual cycles misc Aquatic ecosystems misc Convexity misc Trout misc Seasons misc Environmental changes misc Nutrients (mineral) misc Diet misc Thermocline misc Plankton misc Bullying misc Oscillations misc Surface water misc Food misc Resource availability misc Contraction misc Food chain misc Predators misc Stratification misc Interspecific relationships misc Prey misc Food webs misc Food supply misc Annual variations misc Framework misc Dynamics misc Coupling misc Zoobenthos misc Environmental conditions |
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ddc 570 fid BIODIV bkl 42.00 misc lakes misc secondary production misc primary production misc food webs misc pelagic misc stable isotopes misc Tissues misc Chlorophyll misc Food chains misc Ecosystems misc Niches misc Predation misc Abundance misc Phytoplankton misc Nutrients misc Macroinvertebrates misc Primary production misc Nutrient cycles misc Water column misc Columns (structural) misc Lakes misc Consumers misc Seasonal variations misc Hypolimnion misc Salmon misc Diets misc Hulls (structures) misc Amino acids misc Interactions misc Zooplankton misc Littoral environments misc Hulls misc Water temperature misc Annual cycles misc Aquatic ecosystems misc Convexity misc Trout misc Seasons misc Environmental changes misc Nutrients (mineral) misc Diet misc Thermocline misc Plankton misc Bullying misc Oscillations misc Surface water misc Food misc Resource availability misc Contraction misc Food chain misc Predators misc Stratification misc Interspecific relationships misc Prey misc Food webs misc Food supply misc Annual variations misc Framework misc Dynamics misc Coupling misc Zoobenthos misc Environmental conditions |
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ddc 570 fid BIODIV bkl 42.00 misc lakes misc secondary production misc primary production misc food webs misc pelagic misc stable isotopes misc Tissues misc Chlorophyll misc Food chains misc Ecosystems misc Niches misc Predation misc Abundance misc Phytoplankton misc Nutrients misc Macroinvertebrates misc Primary production misc Nutrient cycles misc Water column misc Columns (structural) misc Lakes misc Consumers misc Seasonal variations misc Hypolimnion misc Salmon misc Diets misc Hulls (structures) misc Amino acids misc Interactions misc Zooplankton misc Littoral environments misc Hulls misc Water temperature misc Annual cycles misc Aquatic ecosystems misc Convexity misc Trout misc Seasons misc Environmental changes misc Nutrients (mineral) misc Diet misc Thermocline misc Plankton misc Bullying misc Oscillations misc Surface water misc Food misc Resource availability misc Contraction misc Food chain misc Predators misc Stratification misc Interspecific relationships misc Prey misc Food webs misc Food supply misc Annual variations misc Framework misc Dynamics misc Coupling misc Zoobenthos misc Environmental conditions |
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Variable littoral‐pelagic coupling as a food‐web response to seasonal changes in pelagic primary production |
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Variable littoral‐pelagic coupling as a food‐web response to seasonal changes in pelagic primary production |
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variable littoral‐pelagic coupling as a food‐web response to seasonal changes in pelagic primary production |
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Variable littoral‐pelagic coupling as a food‐web response to seasonal changes in pelagic primary production |
| abstract |
Lakes are among the most seasonally forced ecosystems on Earth. Seasonal variation in temperature and light produce cyclic patterns in water column mixing, nutrient supply and phytoplankton biomass. Diet responses of consumers to these patterns have rarely been quantified. Moreover, pelagic‐littoral coupling of dietary resources by mobile consumers is commonly considered to be static over annual cycles. This study quantifies littoral‐pelagic diet responses of multiple consumers to a strong shift in pelagic phytoplankton abundance over an annual cycle (September 2014 to August 2015) in a large (area 614 km 2 ), oligotrophic, monomictic lake (Lake Taupō, New Zealand). Intra‐annual patterns in pelagic phytoplankton (chlorophyll a ) and zooplankton were determined over multiple years. Major resource and consumer δ 13 C and δ 15 N were then collected over an annual cycle. Temporal patterns in food‐web structure were examined using convex hulls as a proxy of community trophic niche size. Diet was quantified using mixing models for zooplankton, meso‐predatory zooplanktivorous common smelt ( Retropinna retropinna ) and benthivorous common bullies ( Gobiomorphus cotidianus ), as well as the top‐predator rainbow trout ( Oncorhynchus mykiss ). Trophic structure patterns for smelt, bullies and trout were then independently examined using compound‐specific amino acid δ 15 N analyses ( CSIA ‐ AA ). Lake Taupō demonstrated similar food‐web patterns to other lakes globally. Phytoplankton and zooplankton demonstrated strong seasonal oscillations of abundance driven by both bottom‐up (nutrient supply) and top‐down (stable limit cycle) drivers. The food web demonstrated the typical nested structure. It responded to seasonally low and high pelagic resource availability periods by expansion and contraction, respectively, of trophic niche space. In response to lower pelagic phytoplankton abundance during summer stratification, and phytoplankton accumulation at a deep chlorophyll maximum ( DCM ), zooplankton abundance reduced and their diet became dominated by phytoplankton from below the thermocline (i.e. the hypolimnion and DCM ). This change may have been prompted by the combined drivers of avoidance of predation and depauperate food supply in surface waters. The diet of smelt and bullies switched from predominantly zooplankton to benthic macroinvertebrates, synchronous with the decline in pelagic zooplankton. Trout diet, inferred from comparison of isotopic signatures of tissues with different turnover rates, also increased littoral resource reliance over the stratified period. Smelt, bully and trout CSIA ‐ AA data confirmed estimates of trophic position and indicated a greater degree of trophic complexity in the littoral than the pelagic food chain. Food webs in large, deep lakes such as Taupō are expected to be primarily pelagic. This study demonstrates the need to re‐examine this expectation due to seasonal variations in productivity. The relatively small littoral areas in large lakes, combined with meso‐predators’ highly seasonally variable littoral resource use, may drive strong seasonal top‐down effects on littoral macroinvertebrate prey. Our study supports the notion that food‐web interactions are highly dynamic and responsive to seasonal forcing. By linking food‐web dynamics to dynamic environmental conditions, this study provides a framework for future studies research on understanding lake food‐web responses to a range of annual/seasonal and global environmental change drivers. |
| abstractGer |
Lakes are among the most seasonally forced ecosystems on Earth. Seasonal variation in temperature and light produce cyclic patterns in water column mixing, nutrient supply and phytoplankton biomass. Diet responses of consumers to these patterns have rarely been quantified. Moreover, pelagic‐littoral coupling of dietary resources by mobile consumers is commonly considered to be static over annual cycles. This study quantifies littoral‐pelagic diet responses of multiple consumers to a strong shift in pelagic phytoplankton abundance over an annual cycle (September 2014 to August 2015) in a large (area 614 km 2 ), oligotrophic, monomictic lake (Lake Taupō, New Zealand). Intra‐annual patterns in pelagic phytoplankton (chlorophyll a ) and zooplankton were determined over multiple years. Major resource and consumer δ 13 C and δ 15 N were then collected over an annual cycle. Temporal patterns in food‐web structure were examined using convex hulls as a proxy of community trophic niche size. Diet was quantified using mixing models for zooplankton, meso‐predatory zooplanktivorous common smelt ( Retropinna retropinna ) and benthivorous common bullies ( Gobiomorphus cotidianus ), as well as the top‐predator rainbow trout ( Oncorhynchus mykiss ). Trophic structure patterns for smelt, bullies and trout were then independently examined using compound‐specific amino acid δ 15 N analyses ( CSIA ‐ AA ). Lake Taupō demonstrated similar food‐web patterns to other lakes globally. Phytoplankton and zooplankton demonstrated strong seasonal oscillations of abundance driven by both bottom‐up (nutrient supply) and top‐down (stable limit cycle) drivers. The food web demonstrated the typical nested structure. It responded to seasonally low and high pelagic resource availability periods by expansion and contraction, respectively, of trophic niche space. In response to lower pelagic phytoplankton abundance during summer stratification, and phytoplankton accumulation at a deep chlorophyll maximum ( DCM ), zooplankton abundance reduced and their diet became dominated by phytoplankton from below the thermocline (i.e. the hypolimnion and DCM ). This change may have been prompted by the combined drivers of avoidance of predation and depauperate food supply in surface waters. The diet of smelt and bullies switched from predominantly zooplankton to benthic macroinvertebrates, synchronous with the decline in pelagic zooplankton. Trout diet, inferred from comparison of isotopic signatures of tissues with different turnover rates, also increased littoral resource reliance over the stratified period. Smelt, bully and trout CSIA ‐ AA data confirmed estimates of trophic position and indicated a greater degree of trophic complexity in the littoral than the pelagic food chain. Food webs in large, deep lakes such as Taupō are expected to be primarily pelagic. This study demonstrates the need to re‐examine this expectation due to seasonal variations in productivity. The relatively small littoral areas in large lakes, combined with meso‐predators’ highly seasonally variable littoral resource use, may drive strong seasonal top‐down effects on littoral macroinvertebrate prey. Our study supports the notion that food‐web interactions are highly dynamic and responsive to seasonal forcing. By linking food‐web dynamics to dynamic environmental conditions, this study provides a framework for future studies research on understanding lake food‐web responses to a range of annual/seasonal and global environmental change drivers. |
| abstract_unstemmed |
Lakes are among the most seasonally forced ecosystems on Earth. Seasonal variation in temperature and light produce cyclic patterns in water column mixing, nutrient supply and phytoplankton biomass. Diet responses of consumers to these patterns have rarely been quantified. Moreover, pelagic‐littoral coupling of dietary resources by mobile consumers is commonly considered to be static over annual cycles. This study quantifies littoral‐pelagic diet responses of multiple consumers to a strong shift in pelagic phytoplankton abundance over an annual cycle (September 2014 to August 2015) in a large (area 614 km 2 ), oligotrophic, monomictic lake (Lake Taupō, New Zealand). Intra‐annual patterns in pelagic phytoplankton (chlorophyll a ) and zooplankton were determined over multiple years. Major resource and consumer δ 13 C and δ 15 N were then collected over an annual cycle. Temporal patterns in food‐web structure were examined using convex hulls as a proxy of community trophic niche size. Diet was quantified using mixing models for zooplankton, meso‐predatory zooplanktivorous common smelt ( Retropinna retropinna ) and benthivorous common bullies ( Gobiomorphus cotidianus ), as well as the top‐predator rainbow trout ( Oncorhynchus mykiss ). Trophic structure patterns for smelt, bullies and trout were then independently examined using compound‐specific amino acid δ 15 N analyses ( CSIA ‐ AA ). Lake Taupō demonstrated similar food‐web patterns to other lakes globally. Phytoplankton and zooplankton demonstrated strong seasonal oscillations of abundance driven by both bottom‐up (nutrient supply) and top‐down (stable limit cycle) drivers. The food web demonstrated the typical nested structure. It responded to seasonally low and high pelagic resource availability periods by expansion and contraction, respectively, of trophic niche space. In response to lower pelagic phytoplankton abundance during summer stratification, and phytoplankton accumulation at a deep chlorophyll maximum ( DCM ), zooplankton abundance reduced and their diet became dominated by phytoplankton from below the thermocline (i.e. the hypolimnion and DCM ). This change may have been prompted by the combined drivers of avoidance of predation and depauperate food supply in surface waters. The diet of smelt and bullies switched from predominantly zooplankton to benthic macroinvertebrates, synchronous with the decline in pelagic zooplankton. Trout diet, inferred from comparison of isotopic signatures of tissues with different turnover rates, also increased littoral resource reliance over the stratified period. Smelt, bully and trout CSIA ‐ AA data confirmed estimates of trophic position and indicated a greater degree of trophic complexity in the littoral than the pelagic food chain. Food webs in large, deep lakes such as Taupō are expected to be primarily pelagic. This study demonstrates the need to re‐examine this expectation due to seasonal variations in productivity. The relatively small littoral areas in large lakes, combined with meso‐predators’ highly seasonally variable littoral resource use, may drive strong seasonal top‐down effects on littoral macroinvertebrate prey. Our study supports the notion that food‐web interactions are highly dynamic and responsive to seasonal forcing. By linking food‐web dynamics to dynamic environmental conditions, this study provides a framework for future studies research on understanding lake food‐web responses to a range of annual/seasonal and global environmental change drivers. |
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