Spatial and Temporal Variations of Chlorophyll <i<a</i< and Primary Productivity in the Hangzhou Bay

The Hangzhou Bay (HZB) is an important part of the Zhoushan fishing ground, the most productive region in the Eastern China Seas. Although HZB remains eutrophication all year round, its chlorophyll <i<a</i< (Chl) and primary productivity (PP) are usually significantly lower than those in...
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Autor*in:	Yiheng Wang [verfasserIn] Jianfang Chen [verfasserIn] Feng Zhou [verfasserIn] Wei Zhang [verfasserIn] Qiang Hao [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2022

Schlagwörter:	Hangzhou Bay chlorophyll primary productivity light exposure total suspended matters

Übergeordnetes Werk:	In: Journal of Marine Science and Engineering - MDPI AG, 2014, 10(2022), 3, p 356
Übergeordnetes Werk:	volume:10 ; year:2022 ; number:3, p 356

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3390/jmse10030356

Katalog-ID:	DOAJ007903391

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520			\|a The Hangzhou Bay (HZB) is an important part of the Zhoushan fishing ground, the most productive region in the Eastern China Seas. Although HZB remains eutrophication all year round, its chlorophyll <i<a</i< (Chl) and primary productivity (PP) are usually significantly lower than those in the adjacent waters. In the present study, we presented the Chl and PP distributions in the HZB and analyzed their correlations with environmental factors in four seasons. The field observation showed that Chl and PP had significant seasonal variations, and was highest in the summer (1.66 ± 0.61 mg·m<sup<−3</sup< and 12.11 ± 12.25 mg C·m<sup<−3</sup<·h<sup<−1</sup<, respectively). Total suspended matters (TSM) concentration was the key environmental factor that constrains PP in the study area. High concentration of TSM reduced light exposure (LE, the annual mean value was 0.92 ± 0.81 Einstein·m<sup<−2</sup<·day<sup<−1</sup<) in the mixed layer of the HZB, which was much lower than the saturated light intensity of phytoplankton growth, and thus caused a strong light limitation in the HZB. However, the seasonal variations in the photosynthesis rates (P<sup<B</sup<) and Chl did not coincide. This fact suggested that the growth rate was not the only factor controlling seasonal variations of phytoplankton biomass. In winter, the very high TSM and strong mixing might reduce the zooplankton grazing rate, and lead to a relatively high concentration of Chl during the very low LE and P<sup<B</sup< period. These results implied that, in the HZB, the extremely turbid water could affect both phytoplankton growth and loss, which was probably the major mechanism responsible for the complex phytoplankton spatial and temporal variations.
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callnumber-first	V - Naval Science
author	Yiheng Wang
spellingShingle	Yiheng Wang misc VM1-989 misc GC1-1581 misc Hangzhou Bay misc chlorophyll <i<a</i< misc primary productivity misc light exposure misc total suspended matters misc Naval architecture. Shipbuilding. Marine engineering misc Oceanography Spatial and Temporal Variations of Chlorophyll <i<a</i< and Primary Productivity in the Hangzhou Bay
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topic	misc VM1-989 misc GC1-1581 misc Hangzhou Bay misc chlorophyll <i<a</i< misc primary productivity misc light exposure misc total suspended matters misc Naval architecture. Shipbuilding. Marine engineering misc Oceanography
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title	Spatial and Temporal Variations of Chlorophyll <i<a</i< and Primary Productivity in the Hangzhou Bay
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title_full	Spatial and Temporal Variations of Chlorophyll <i<a</i< and Primary Productivity in the Hangzhou Bay
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title_sort	spatial and temporal variations of chlorophyll <i<a</i< and primary productivity in the hangzhou bay
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title_auth	Spatial and Temporal Variations of Chlorophyll <i<a</i< and Primary Productivity in the Hangzhou Bay
abstract	The Hangzhou Bay (HZB) is an important part of the Zhoushan fishing ground, the most productive region in the Eastern China Seas. Although HZB remains eutrophication all year round, its chlorophyll <i<a</i< (Chl) and primary productivity (PP) are usually significantly lower than those in the adjacent waters. In the present study, we presented the Chl and PP distributions in the HZB and analyzed their correlations with environmental factors in four seasons. The field observation showed that Chl and PP had significant seasonal variations, and was highest in the summer (1.66 ± 0.61 mg·m<sup<−3</sup< and 12.11 ± 12.25 mg C·m<sup<−3</sup<·h<sup<−1</sup<, respectively). Total suspended matters (TSM) concentration was the key environmental factor that constrains PP in the study area. High concentration of TSM reduced light exposure (LE, the annual mean value was 0.92 ± 0.81 Einstein·m<sup<−2</sup<·day<sup<−1</sup<) in the mixed layer of the HZB, which was much lower than the saturated light intensity of phytoplankton growth, and thus caused a strong light limitation in the HZB. However, the seasonal variations in the photosynthesis rates (P<sup<B</sup<) and Chl did not coincide. This fact suggested that the growth rate was not the only factor controlling seasonal variations of phytoplankton biomass. In winter, the very high TSM and strong mixing might reduce the zooplankton grazing rate, and lead to a relatively high concentration of Chl during the very low LE and P<sup<B</sup< period. These results implied that, in the HZB, the extremely turbid water could affect both phytoplankton growth and loss, which was probably the major mechanism responsible for the complex phytoplankton spatial and temporal variations.
abstractGer	The Hangzhou Bay (HZB) is an important part of the Zhoushan fishing ground, the most productive region in the Eastern China Seas. Although HZB remains eutrophication all year round, its chlorophyll <i<a</i< (Chl) and primary productivity (PP) are usually significantly lower than those in the adjacent waters. In the present study, we presented the Chl and PP distributions in the HZB and analyzed their correlations with environmental factors in four seasons. The field observation showed that Chl and PP had significant seasonal variations, and was highest in the summer (1.66 ± 0.61 mg·m<sup<−3</sup< and 12.11 ± 12.25 mg C·m<sup<−3</sup<·h<sup<−1</sup<, respectively). Total suspended matters (TSM) concentration was the key environmental factor that constrains PP in the study area. High concentration of TSM reduced light exposure (LE, the annual mean value was 0.92 ± 0.81 Einstein·m<sup<−2</sup<·day<sup<−1</sup<) in the mixed layer of the HZB, which was much lower than the saturated light intensity of phytoplankton growth, and thus caused a strong light limitation in the HZB. However, the seasonal variations in the photosynthesis rates (P<sup<B</sup<) and Chl did not coincide. This fact suggested that the growth rate was not the only factor controlling seasonal variations of phytoplankton biomass. In winter, the very high TSM and strong mixing might reduce the zooplankton grazing rate, and lead to a relatively high concentration of Chl during the very low LE and P<sup<B</sup< period. These results implied that, in the HZB, the extremely turbid water could affect both phytoplankton growth and loss, which was probably the major mechanism responsible for the complex phytoplankton spatial and temporal variations.
abstract_unstemmed	The Hangzhou Bay (HZB) is an important part of the Zhoushan fishing ground, the most productive region in the Eastern China Seas. Although HZB remains eutrophication all year round, its chlorophyll <i<a</i< (Chl) and primary productivity (PP) are usually significantly lower than those in the adjacent waters. In the present study, we presented the Chl and PP distributions in the HZB and analyzed their correlations with environmental factors in four seasons. The field observation showed that Chl and PP had significant seasonal variations, and was highest in the summer (1.66 ± 0.61 mg·m<sup<−3</sup< and 12.11 ± 12.25 mg C·m<sup<−3</sup<·h<sup<−1</sup<, respectively). Total suspended matters (TSM) concentration was the key environmental factor that constrains PP in the study area. High concentration of TSM reduced light exposure (LE, the annual mean value was 0.92 ± 0.81 Einstein·m<sup<−2</sup<·day<sup<−1</sup<) in the mixed layer of the HZB, which was much lower than the saturated light intensity of phytoplankton growth, and thus caused a strong light limitation in the HZB. However, the seasonal variations in the photosynthesis rates (P<sup<B</sup<) and Chl did not coincide. This fact suggested that the growth rate was not the only factor controlling seasonal variations of phytoplankton biomass. In winter, the very high TSM and strong mixing might reduce the zooplankton grazing rate, and lead to a relatively high concentration of Chl during the very low LE and P<sup<B</sup< period. These results implied that, in the HZB, the extremely turbid water could affect both phytoplankton growth and loss, which was probably the major mechanism responsible for the complex phytoplankton spatial and temporal variations.
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title_short	Spatial and Temporal Variations of Chlorophyll <i<a</i< and Primary Productivity in the Hangzhou Bay
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Although HZB remains eutrophication all year round, its chlorophyll <i<a</i< (Chl) and primary productivity (PP) are usually significantly lower than those in the adjacent waters. In the present study, we presented the Chl and PP distributions in the HZB and analyzed their correlations with environmental factors in four seasons. The field observation showed that Chl and PP had significant seasonal variations, and was highest in the summer (1.66 ± 0.61 mg·m<sup<−3</sup< and 12.11 ± 12.25 mg C·m<sup<−3</sup<·h<sup<−1</sup<, respectively). Total suspended matters (TSM) concentration was the key environmental factor that constrains PP in the study area. High concentration of TSM reduced light exposure (LE, the annual mean value was 0.92 ± 0.81 Einstein·m<sup<−2</sup<·day<sup<−1</sup<) in the mixed layer of the HZB, which was much lower than the saturated light intensity of phytoplankton growth, and thus caused a strong light limitation in the HZB. However, the seasonal variations in the photosynthesis rates (P<sup<B</sup<) and Chl did not coincide. This fact suggested that the growth rate was not the only factor controlling seasonal variations of phytoplankton biomass. In winter, the very high TSM and strong mixing might reduce the zooplankton grazing rate, and lead to a relatively high concentration of Chl during the very low LE and P<sup<B</sup< period. These results implied that, in the HZB, the extremely turbid water could affect both phytoplankton growth and loss, which was probably the major mechanism responsible for the complex phytoplankton spatial and temporal variations.</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Hangzhou Bay</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">chlorophyll <i<a</i<</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">primary productivity</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">light exposure</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">total suspended matters</subfield></datafield><datafield tag="653" ind1=" " ind2="0"><subfield code="a">Naval architecture. Shipbuilding. 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Spatial and Temporal Variations of Chlorophyll <i<a</i< and Primary Productivity in the Hangzhou Bay

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