Element Concentrations in the Flesh and Osteoderms of Estuarine Crocodiles (Crocodylus porosus) from the Alligator Rivers Region, Northern Australia: Biotic and Geographic Effects
Abstract The concentrations of Na, K, Ca, Mg, Ba, Sr, Fe, Al, Mn, Zn, Pb, Cu, Ni, Cr, Co, Se, U, and Ti were determined in the flesh and osteoderms of estuarine crocodiles (Crocodylus porosus) captured in three adjacent catchments of Kakadu National Park, within the Alligator Rivers Region of northe...
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| Autor*in: |
Jeffree, R. A. [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2001 |
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| Schlagwörter: |
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| Anmerkung: |
© Springer-Verlag New York Inc. 2001 |
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| Übergeordnetes Werk: |
Enthalten in: Archives of environmental contamination and toxicology - Springer-Verlag, 1973, 40(2001), 2 vom: Feb., Seite 236-245 |
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| Übergeordnetes Werk: |
volume:40 ; year:2001 ; number:2 ; month:02 ; pages:236-245 |
| Links: |
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| DOI / URN: |
10.1007/s002440010168 |
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| Katalog-ID: |
OLC2070700682 |
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| 520 | |a Abstract The concentrations of Na, K, Ca, Mg, Ba, Sr, Fe, Al, Mn, Zn, Pb, Cu, Ni, Cr, Co, Se, U, and Ti were determined in the flesh and osteoderms of estuarine crocodiles (Crocodylus porosus) captured in three adjacent catchments of Kakadu National Park, within the Alligator Rivers Region of northern Australia. This study provides, for the first-time, baseline concentrations of elements in both flesh and osteoderms of wild crocodiles. Multiple linear regression analyses were used to determine the effects of total crocodile length, estimated age, gender, inferred reproductive status, physical condition, and catchment of capture on element concentrations in both tissues. The Mg concentration ($ log_{10} $) in the flesh and osteoderms of C. porosus significantly (p ≤ 0.001) decreased with increasing length (1.7–5.0 m) and estimated age (5–40 years). Similarly, the Ti concentration ($ log_{10} $) in flesh significantly (p ≤ 0.01) decreased with increasing length. In contrast, Zn and Se concentration ($ log_{10} $) in flesh significantly (p ≤ 0.001) increased with increasing length and/or age, suggesting that these relationships are mediated by biological rather than environmental chemical factors. In flesh, Fe and Na concentrations ($ log_{10} $) significantly (p ≤ 0.05) increased as the physical condition of C. porosus deteriorated. No significant (p > 0.05) effects of gender or inferred reproductive status on element concentrations in the flesh and osteoderms were found. The mean concentrations ($ log_{10} $) of Al, Ba, Cr, Ni, and Pb in flesh and Co, Fe, Mg, Mn, and U in the osteoderms were significantly (p ≤ 0.01) different between catchments. The significant (p ≤ 0.05) effects of catchment on the concentrations of various elements indicate that C. porosus reflects the chemistry of its environmental milieu and therefore has a certain degree of catchment fidelity, even though the catchments are adjacent to one another. Such catchment-specific signals may be useful in the determination of the provenance of itinerant crocodiles. They also point to the utility of crocodiles as long-term biomonitors of their environment. | ||
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10.1007/s002440010168 doi (DE-627)OLC2070700682 (DE-He213)s002440010168-p DE-627 ger DE-627 rakwb eng 333.7 610 VZ Jeffree, R. A. verfasserin aut Element Concentrations in the Flesh and Osteoderms of Estuarine Crocodiles (Crocodylus porosus) from the Alligator Rivers Region, Northern Australia: Biotic and Geographic Effects 2001 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag New York Inc. 2001 Abstract The concentrations of Na, K, Ca, Mg, Ba, Sr, Fe, Al, Mn, Zn, Pb, Cu, Ni, Cr, Co, Se, U, and Ti were determined in the flesh and osteoderms of estuarine crocodiles (Crocodylus porosus) captured in three adjacent catchments of Kakadu National Park, within the Alligator Rivers Region of northern Australia. This study provides, for the first-time, baseline concentrations of elements in both flesh and osteoderms of wild crocodiles. Multiple linear regression analyses were used to determine the effects of total crocodile length, estimated age, gender, inferred reproductive status, physical condition, and catchment of capture on element concentrations in both tissues. The Mg concentration ($ log_{10} $) in the flesh and osteoderms of C. porosus significantly (p ≤ 0.001) decreased with increasing length (1.7–5.0 m) and estimated age (5–40 years). Similarly, the Ti concentration ($ log_{10} $) in flesh significantly (p ≤ 0.01) decreased with increasing length. In contrast, Zn and Se concentration ($ log_{10} $) in flesh significantly (p ≤ 0.001) increased with increasing length and/or age, suggesting that these relationships are mediated by biological rather than environmental chemical factors. In flesh, Fe and Na concentrations ($ log_{10} $) significantly (p ≤ 0.05) increased as the physical condition of C. porosus deteriorated. No significant (p > 0.05) effects of gender or inferred reproductive status on element concentrations in the flesh and osteoderms were found. The mean concentrations ($ log_{10} $) of Al, Ba, Cr, Ni, and Pb in flesh and Co, Fe, Mg, Mn, and U in the osteoderms were significantly (p ≤ 0.01) different between catchments. The significant (p ≤ 0.05) effects of catchment on the concentrations of various elements indicate that C. porosus reflects the chemistry of its environmental milieu and therefore has a certain degree of catchment fidelity, even though the catchments are adjacent to one another. Such catchment-specific signals may be useful in the determination of the provenance of itinerant crocodiles. They also point to the utility of crocodiles as long-term biomonitors of their environment. Linear Regression Physical Condition Regression Analysis Linear Regression Analysis Multiple Linear Regression Markich, S. J. aut Twining, J. R. aut Enthalten in Archives of environmental contamination and toxicology Springer-Verlag, 1973 40(2001), 2 vom: Feb., Seite 236-245 (DE-627)129397725 (DE-600)185986-9 (DE-576)01478100X 0090-4341 nnns volume:40 year:2001 number:2 month:02 pages:236-245 https://doi.org/10.1007/s002440010168 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW GBV_ILN_11 GBV_ILN_21 GBV_ILN_22 GBV_ILN_23 GBV_ILN_31 GBV_ILN_69 GBV_ILN_70 GBV_ILN_130 GBV_ILN_154 GBV_ILN_252 GBV_ILN_601 GBV_ILN_2006 GBV_ILN_2018 GBV_ILN_2021 GBV_ILN_2360 GBV_ILN_4012 GBV_ILN_4219 GBV_ILN_4277 GBV_ILN_4313 AR 40 2001 2 02 236-245 |
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10.1007/s002440010168 doi (DE-627)OLC2070700682 (DE-He213)s002440010168-p DE-627 ger DE-627 rakwb eng 333.7 610 VZ Jeffree, R. A. verfasserin aut Element Concentrations in the Flesh and Osteoderms of Estuarine Crocodiles (Crocodylus porosus) from the Alligator Rivers Region, Northern Australia: Biotic and Geographic Effects 2001 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag New York Inc. 2001 Abstract The concentrations of Na, K, Ca, Mg, Ba, Sr, Fe, Al, Mn, Zn, Pb, Cu, Ni, Cr, Co, Se, U, and Ti were determined in the flesh and osteoderms of estuarine crocodiles (Crocodylus porosus) captured in three adjacent catchments of Kakadu National Park, within the Alligator Rivers Region of northern Australia. This study provides, for the first-time, baseline concentrations of elements in both flesh and osteoderms of wild crocodiles. Multiple linear regression analyses were used to determine the effects of total crocodile length, estimated age, gender, inferred reproductive status, physical condition, and catchment of capture on element concentrations in both tissues. The Mg concentration ($ log_{10} $) in the flesh and osteoderms of C. porosus significantly (p ≤ 0.001) decreased with increasing length (1.7–5.0 m) and estimated age (5–40 years). Similarly, the Ti concentration ($ log_{10} $) in flesh significantly (p ≤ 0.01) decreased with increasing length. In contrast, Zn and Se concentration ($ log_{10} $) in flesh significantly (p ≤ 0.001) increased with increasing length and/or age, suggesting that these relationships are mediated by biological rather than environmental chemical factors. In flesh, Fe and Na concentrations ($ log_{10} $) significantly (p ≤ 0.05) increased as the physical condition of C. porosus deteriorated. No significant (p > 0.05) effects of gender or inferred reproductive status on element concentrations in the flesh and osteoderms were found. The mean concentrations ($ log_{10} $) of Al, Ba, Cr, Ni, and Pb in flesh and Co, Fe, Mg, Mn, and U in the osteoderms were significantly (p ≤ 0.01) different between catchments. The significant (p ≤ 0.05) effects of catchment on the concentrations of various elements indicate that C. porosus reflects the chemistry of its environmental milieu and therefore has a certain degree of catchment fidelity, even though the catchments are adjacent to one another. Such catchment-specific signals may be useful in the determination of the provenance of itinerant crocodiles. They also point to the utility of crocodiles as long-term biomonitors of their environment. Linear Regression Physical Condition Regression Analysis Linear Regression Analysis Multiple Linear Regression Markich, S. J. aut Twining, J. R. aut Enthalten in Archives of environmental contamination and toxicology Springer-Verlag, 1973 40(2001), 2 vom: Feb., Seite 236-245 (DE-627)129397725 (DE-600)185986-9 (DE-576)01478100X 0090-4341 nnns volume:40 year:2001 number:2 month:02 pages:236-245 https://doi.org/10.1007/s002440010168 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW GBV_ILN_11 GBV_ILN_21 GBV_ILN_22 GBV_ILN_23 GBV_ILN_31 GBV_ILN_69 GBV_ILN_70 GBV_ILN_130 GBV_ILN_154 GBV_ILN_252 GBV_ILN_601 GBV_ILN_2006 GBV_ILN_2018 GBV_ILN_2021 GBV_ILN_2360 GBV_ILN_4012 GBV_ILN_4219 GBV_ILN_4277 GBV_ILN_4313 AR 40 2001 2 02 236-245 |
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10.1007/s002440010168 doi (DE-627)OLC2070700682 (DE-He213)s002440010168-p DE-627 ger DE-627 rakwb eng 333.7 610 VZ Jeffree, R. A. verfasserin aut Element Concentrations in the Flesh and Osteoderms of Estuarine Crocodiles (Crocodylus porosus) from the Alligator Rivers Region, Northern Australia: Biotic and Geographic Effects 2001 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag New York Inc. 2001 Abstract The concentrations of Na, K, Ca, Mg, Ba, Sr, Fe, Al, Mn, Zn, Pb, Cu, Ni, Cr, Co, Se, U, and Ti were determined in the flesh and osteoderms of estuarine crocodiles (Crocodylus porosus) captured in three adjacent catchments of Kakadu National Park, within the Alligator Rivers Region of northern Australia. This study provides, for the first-time, baseline concentrations of elements in both flesh and osteoderms of wild crocodiles. Multiple linear regression analyses were used to determine the effects of total crocodile length, estimated age, gender, inferred reproductive status, physical condition, and catchment of capture on element concentrations in both tissues. The Mg concentration ($ log_{10} $) in the flesh and osteoderms of C. porosus significantly (p ≤ 0.001) decreased with increasing length (1.7–5.0 m) and estimated age (5–40 years). Similarly, the Ti concentration ($ log_{10} $) in flesh significantly (p ≤ 0.01) decreased with increasing length. In contrast, Zn and Se concentration ($ log_{10} $) in flesh significantly (p ≤ 0.001) increased with increasing length and/or age, suggesting that these relationships are mediated by biological rather than environmental chemical factors. In flesh, Fe and Na concentrations ($ log_{10} $) significantly (p ≤ 0.05) increased as the physical condition of C. porosus deteriorated. No significant (p > 0.05) effects of gender or inferred reproductive status on element concentrations in the flesh and osteoderms were found. The mean concentrations ($ log_{10} $) of Al, Ba, Cr, Ni, and Pb in flesh and Co, Fe, Mg, Mn, and U in the osteoderms were significantly (p ≤ 0.01) different between catchments. The significant (p ≤ 0.05) effects of catchment on the concentrations of various elements indicate that C. porosus reflects the chemistry of its environmental milieu and therefore has a certain degree of catchment fidelity, even though the catchments are adjacent to one another. Such catchment-specific signals may be useful in the determination of the provenance of itinerant crocodiles. They also point to the utility of crocodiles as long-term biomonitors of their environment. Linear Regression Physical Condition Regression Analysis Linear Regression Analysis Multiple Linear Regression Markich, S. J. aut Twining, J. R. aut Enthalten in Archives of environmental contamination and toxicology Springer-Verlag, 1973 40(2001), 2 vom: Feb., Seite 236-245 (DE-627)129397725 (DE-600)185986-9 (DE-576)01478100X 0090-4341 nnns volume:40 year:2001 number:2 month:02 pages:236-245 https://doi.org/10.1007/s002440010168 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW GBV_ILN_11 GBV_ILN_21 GBV_ILN_22 GBV_ILN_23 GBV_ILN_31 GBV_ILN_69 GBV_ILN_70 GBV_ILN_130 GBV_ILN_154 GBV_ILN_252 GBV_ILN_601 GBV_ILN_2006 GBV_ILN_2018 GBV_ILN_2021 GBV_ILN_2360 GBV_ILN_4012 GBV_ILN_4219 GBV_ILN_4277 GBV_ILN_4313 AR 40 2001 2 02 236-245 |
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10.1007/s002440010168 doi (DE-627)OLC2070700682 (DE-He213)s002440010168-p DE-627 ger DE-627 rakwb eng 333.7 610 VZ Jeffree, R. A. verfasserin aut Element Concentrations in the Flesh and Osteoderms of Estuarine Crocodiles (Crocodylus porosus) from the Alligator Rivers Region, Northern Australia: Biotic and Geographic Effects 2001 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag New York Inc. 2001 Abstract The concentrations of Na, K, Ca, Mg, Ba, Sr, Fe, Al, Mn, Zn, Pb, Cu, Ni, Cr, Co, Se, U, and Ti were determined in the flesh and osteoderms of estuarine crocodiles (Crocodylus porosus) captured in three adjacent catchments of Kakadu National Park, within the Alligator Rivers Region of northern Australia. This study provides, for the first-time, baseline concentrations of elements in both flesh and osteoderms of wild crocodiles. Multiple linear regression analyses were used to determine the effects of total crocodile length, estimated age, gender, inferred reproductive status, physical condition, and catchment of capture on element concentrations in both tissues. The Mg concentration ($ log_{10} $) in the flesh and osteoderms of C. porosus significantly (p ≤ 0.001) decreased with increasing length (1.7–5.0 m) and estimated age (5–40 years). Similarly, the Ti concentration ($ log_{10} $) in flesh significantly (p ≤ 0.01) decreased with increasing length. In contrast, Zn and Se concentration ($ log_{10} $) in flesh significantly (p ≤ 0.001) increased with increasing length and/or age, suggesting that these relationships are mediated by biological rather than environmental chemical factors. In flesh, Fe and Na concentrations ($ log_{10} $) significantly (p ≤ 0.05) increased as the physical condition of C. porosus deteriorated. No significant (p > 0.05) effects of gender or inferred reproductive status on element concentrations in the flesh and osteoderms were found. The mean concentrations ($ log_{10} $) of Al, Ba, Cr, Ni, and Pb in flesh and Co, Fe, Mg, Mn, and U in the osteoderms were significantly (p ≤ 0.01) different between catchments. The significant (p ≤ 0.05) effects of catchment on the concentrations of various elements indicate that C. porosus reflects the chemistry of its environmental milieu and therefore has a certain degree of catchment fidelity, even though the catchments are adjacent to one another. Such catchment-specific signals may be useful in the determination of the provenance of itinerant crocodiles. They also point to the utility of crocodiles as long-term biomonitors of their environment. Linear Regression Physical Condition Regression Analysis Linear Regression Analysis Multiple Linear Regression Markich, S. J. aut Twining, J. R. aut Enthalten in Archives of environmental contamination and toxicology Springer-Verlag, 1973 40(2001), 2 vom: Feb., Seite 236-245 (DE-627)129397725 (DE-600)185986-9 (DE-576)01478100X 0090-4341 nnns volume:40 year:2001 number:2 month:02 pages:236-245 https://doi.org/10.1007/s002440010168 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW GBV_ILN_11 GBV_ILN_21 GBV_ILN_22 GBV_ILN_23 GBV_ILN_31 GBV_ILN_69 GBV_ILN_70 GBV_ILN_130 GBV_ILN_154 GBV_ILN_252 GBV_ILN_601 GBV_ILN_2006 GBV_ILN_2018 GBV_ILN_2021 GBV_ILN_2360 GBV_ILN_4012 GBV_ILN_4219 GBV_ILN_4277 GBV_ILN_4313 AR 40 2001 2 02 236-245 |
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10.1007/s002440010168 doi (DE-627)OLC2070700682 (DE-He213)s002440010168-p DE-627 ger DE-627 rakwb eng 333.7 610 VZ Jeffree, R. A. verfasserin aut Element Concentrations in the Flesh and Osteoderms of Estuarine Crocodiles (Crocodylus porosus) from the Alligator Rivers Region, Northern Australia: Biotic and Geographic Effects 2001 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag New York Inc. 2001 Abstract The concentrations of Na, K, Ca, Mg, Ba, Sr, Fe, Al, Mn, Zn, Pb, Cu, Ni, Cr, Co, Se, U, and Ti were determined in the flesh and osteoderms of estuarine crocodiles (Crocodylus porosus) captured in three adjacent catchments of Kakadu National Park, within the Alligator Rivers Region of northern Australia. This study provides, for the first-time, baseline concentrations of elements in both flesh and osteoderms of wild crocodiles. Multiple linear regression analyses were used to determine the effects of total crocodile length, estimated age, gender, inferred reproductive status, physical condition, and catchment of capture on element concentrations in both tissues. The Mg concentration ($ log_{10} $) in the flesh and osteoderms of C. porosus significantly (p ≤ 0.001) decreased with increasing length (1.7–5.0 m) and estimated age (5–40 years). Similarly, the Ti concentration ($ log_{10} $) in flesh significantly (p ≤ 0.01) decreased with increasing length. In contrast, Zn and Se concentration ($ log_{10} $) in flesh significantly (p ≤ 0.001) increased with increasing length and/or age, suggesting that these relationships are mediated by biological rather than environmental chemical factors. In flesh, Fe and Na concentrations ($ log_{10} $) significantly (p ≤ 0.05) increased as the physical condition of C. porosus deteriorated. No significant (p > 0.05) effects of gender or inferred reproductive status on element concentrations in the flesh and osteoderms were found. The mean concentrations ($ log_{10} $) of Al, Ba, Cr, Ni, and Pb in flesh and Co, Fe, Mg, Mn, and U in the osteoderms were significantly (p ≤ 0.01) different between catchments. The significant (p ≤ 0.05) effects of catchment on the concentrations of various elements indicate that C. porosus reflects the chemistry of its environmental milieu and therefore has a certain degree of catchment fidelity, even though the catchments are adjacent to one another. Such catchment-specific signals may be useful in the determination of the provenance of itinerant crocodiles. They also point to the utility of crocodiles as long-term biomonitors of their environment. Linear Regression Physical Condition Regression Analysis Linear Regression Analysis Multiple Linear Regression Markich, S. J. aut Twining, J. R. aut Enthalten in Archives of environmental contamination and toxicology Springer-Verlag, 1973 40(2001), 2 vom: Feb., Seite 236-245 (DE-627)129397725 (DE-600)185986-9 (DE-576)01478100X 0090-4341 nnns volume:40 year:2001 number:2 month:02 pages:236-245 https://doi.org/10.1007/s002440010168 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW GBV_ILN_11 GBV_ILN_21 GBV_ILN_22 GBV_ILN_23 GBV_ILN_31 GBV_ILN_69 GBV_ILN_70 GBV_ILN_130 GBV_ILN_154 GBV_ILN_252 GBV_ILN_601 GBV_ILN_2006 GBV_ILN_2018 GBV_ILN_2021 GBV_ILN_2360 GBV_ILN_4012 GBV_ILN_4219 GBV_ILN_4277 GBV_ILN_4313 AR 40 2001 2 02 236-245 |
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element concentrations in the flesh and osteoderms of estuarine crocodiles (crocodylus porosus) from the alligator rivers region, northern australia: biotic and geographic effects |
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Element Concentrations in the Flesh and Osteoderms of Estuarine Crocodiles (Crocodylus porosus) from the Alligator Rivers Region, Northern Australia: Biotic and Geographic Effects |
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Abstract The concentrations of Na, K, Ca, Mg, Ba, Sr, Fe, Al, Mn, Zn, Pb, Cu, Ni, Cr, Co, Se, U, and Ti were determined in the flesh and osteoderms of estuarine crocodiles (Crocodylus porosus) captured in three adjacent catchments of Kakadu National Park, within the Alligator Rivers Region of northern Australia. This study provides, for the first-time, baseline concentrations of elements in both flesh and osteoderms of wild crocodiles. Multiple linear regression analyses were used to determine the effects of total crocodile length, estimated age, gender, inferred reproductive status, physical condition, and catchment of capture on element concentrations in both tissues. The Mg concentration ($ log_{10} $) in the flesh and osteoderms of C. porosus significantly (p ≤ 0.001) decreased with increasing length (1.7–5.0 m) and estimated age (5–40 years). Similarly, the Ti concentration ($ log_{10} $) in flesh significantly (p ≤ 0.01) decreased with increasing length. In contrast, Zn and Se concentration ($ log_{10} $) in flesh significantly (p ≤ 0.001) increased with increasing length and/or age, suggesting that these relationships are mediated by biological rather than environmental chemical factors. In flesh, Fe and Na concentrations ($ log_{10} $) significantly (p ≤ 0.05) increased as the physical condition of C. porosus deteriorated. No significant (p > 0.05) effects of gender or inferred reproductive status on element concentrations in the flesh and osteoderms were found. The mean concentrations ($ log_{10} $) of Al, Ba, Cr, Ni, and Pb in flesh and Co, Fe, Mg, Mn, and U in the osteoderms were significantly (p ≤ 0.01) different between catchments. The significant (p ≤ 0.05) effects of catchment on the concentrations of various elements indicate that C. porosus reflects the chemistry of its environmental milieu and therefore has a certain degree of catchment fidelity, even though the catchments are adjacent to one another. Such catchment-specific signals may be useful in the determination of the provenance of itinerant crocodiles. They also point to the utility of crocodiles as long-term biomonitors of their environment. © Springer-Verlag New York Inc. 2001 |
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Abstract The concentrations of Na, K, Ca, Mg, Ba, Sr, Fe, Al, Mn, Zn, Pb, Cu, Ni, Cr, Co, Se, U, and Ti were determined in the flesh and osteoderms of estuarine crocodiles (Crocodylus porosus) captured in three adjacent catchments of Kakadu National Park, within the Alligator Rivers Region of northern Australia. This study provides, for the first-time, baseline concentrations of elements in both flesh and osteoderms of wild crocodiles. Multiple linear regression analyses were used to determine the effects of total crocodile length, estimated age, gender, inferred reproductive status, physical condition, and catchment of capture on element concentrations in both tissues. The Mg concentration ($ log_{10} $) in the flesh and osteoderms of C. porosus significantly (p ≤ 0.001) decreased with increasing length (1.7–5.0 m) and estimated age (5–40 years). Similarly, the Ti concentration ($ log_{10} $) in flesh significantly (p ≤ 0.01) decreased with increasing length. In contrast, Zn and Se concentration ($ log_{10} $) in flesh significantly (p ≤ 0.001) increased with increasing length and/or age, suggesting that these relationships are mediated by biological rather than environmental chemical factors. In flesh, Fe and Na concentrations ($ log_{10} $) significantly (p ≤ 0.05) increased as the physical condition of C. porosus deteriorated. No significant (p > 0.05) effects of gender or inferred reproductive status on element concentrations in the flesh and osteoderms were found. The mean concentrations ($ log_{10} $) of Al, Ba, Cr, Ni, and Pb in flesh and Co, Fe, Mg, Mn, and U in the osteoderms were significantly (p ≤ 0.01) different between catchments. The significant (p ≤ 0.05) effects of catchment on the concentrations of various elements indicate that C. porosus reflects the chemistry of its environmental milieu and therefore has a certain degree of catchment fidelity, even though the catchments are adjacent to one another. Such catchment-specific signals may be useful in the determination of the provenance of itinerant crocodiles. They also point to the utility of crocodiles as long-term biomonitors of their environment. © Springer-Verlag New York Inc. 2001 |
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Abstract The concentrations of Na, K, Ca, Mg, Ba, Sr, Fe, Al, Mn, Zn, Pb, Cu, Ni, Cr, Co, Se, U, and Ti were determined in the flesh and osteoderms of estuarine crocodiles (Crocodylus porosus) captured in three adjacent catchments of Kakadu National Park, within the Alligator Rivers Region of northern Australia. This study provides, for the first-time, baseline concentrations of elements in both flesh and osteoderms of wild crocodiles. Multiple linear regression analyses were used to determine the effects of total crocodile length, estimated age, gender, inferred reproductive status, physical condition, and catchment of capture on element concentrations in both tissues. The Mg concentration ($ log_{10} $) in the flesh and osteoderms of C. porosus significantly (p ≤ 0.001) decreased with increasing length (1.7–5.0 m) and estimated age (5–40 years). Similarly, the Ti concentration ($ log_{10} $) in flesh significantly (p ≤ 0.01) decreased with increasing length. In contrast, Zn and Se concentration ($ log_{10} $) in flesh significantly (p ≤ 0.001) increased with increasing length and/or age, suggesting that these relationships are mediated by biological rather than environmental chemical factors. In flesh, Fe and Na concentrations ($ log_{10} $) significantly (p ≤ 0.05) increased as the physical condition of C. porosus deteriorated. No significant (p > 0.05) effects of gender or inferred reproductive status on element concentrations in the flesh and osteoderms were found. The mean concentrations ($ log_{10} $) of Al, Ba, Cr, Ni, and Pb in flesh and Co, Fe, Mg, Mn, and U in the osteoderms were significantly (p ≤ 0.01) different between catchments. The significant (p ≤ 0.05) effects of catchment on the concentrations of various elements indicate that C. porosus reflects the chemistry of its environmental milieu and therefore has a certain degree of catchment fidelity, even though the catchments are adjacent to one another. Such catchment-specific signals may be useful in the determination of the provenance of itinerant crocodiles. They also point to the utility of crocodiles as long-term biomonitors of their environment. © Springer-Verlag New York Inc. 2001 |
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In flesh, Fe and Na concentrations ($ log_{10} $) significantly (p ≤ 0.05) increased as the physical condition of C. porosus deteriorated. No significant (p > 0.05) effects of gender or inferred reproductive status on element concentrations in the flesh and osteoderms were found. The mean concentrations ($ log_{10} $) of Al, Ba, Cr, Ni, and Pb in flesh and Co, Fe, Mg, Mn, and U in the osteoderms were significantly (p ≤ 0.01) different between catchments. The significant (p ≤ 0.05) effects of catchment on the concentrations of various elements indicate that C. porosus reflects the chemistry of its environmental milieu and therefore has a certain degree of catchment fidelity, even though the catchments are adjacent to one another. Such catchment-specific signals may be useful in the determination of the provenance of itinerant crocodiles. 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