Organochlorine Pollutants and Stable Isotopes in Resident and Migrant Passerine Birds from Northwest Michoacán, Mexico
Abstract Although concentrations of organochlorine compounds (OCs) in birds from most of the United States and Canada have decreased over the last 30 years, there is still concern that migrant birds might be exposed to elevated concentrations of OCs during migration in Latin America. The Lerma-Chapa...
Ausführliche Beschreibung
Autor*in: |
Mora, Miguel A. [verfasserIn] |
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Artikel |
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Sprache: |
Englisch |
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2008 |
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Anmerkung: |
© Springer Science+Business Media, LLC 2008 |
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Übergeordnetes Werk: |
Enthalten in: Archives of environmental contamination and toxicology - Springer-Verlag, 1973, 55(2008), 3 vom: 29. Jan., Seite 488-495 |
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Übergeordnetes Werk: |
volume:55 ; year:2008 ; number:3 ; day:29 ; month:01 ; pages:488-495 |
Links: |
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DOI / URN: |
10.1007/s00244-007-9124-z |
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Katalog-ID: |
OLC2070711307 |
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520 | |a Abstract Although concentrations of organochlorine compounds (OCs) in birds from most of the United States and Canada have decreased over the last 30 years, there is still concern that migrant birds might be exposed to elevated concentrations of OCs during migration in Latin America. The Lerma-Chapala Basin in west-central Mexico is an important migration corridor and wintering area for many species. The objectives of this study were to assess if resident and migrant birds wintering in western Michoacán, Mexico accumulated elevated concentrations of OCs during fall and spring and to determine if the stable isotopes $ δ^{15} $N, $ δ^{13} $C, and δD could be used to predict burdens and origins of DDE accumulation. Resident and migrant passerine insectivorous birds were collected during fall and spring (2001–2002) in northwest Michoacán, near Chapala Lake, Mexico. The carcasses were analyzed for OCs and tail feathers were analyzed for stable isotopes $ δ^{15} $N, $ δ^{13} $C, and δD. The OCs detected in more than 50% of the samples were: oxychlordane (79%), p,p’-DDE (100%), p,p′-DDT (57%), and total PCBs (100%). p,p′-DDE was the OC detected at the highest concentrations, whereas residues of other OCs were near or below detection limits. Overall, there were no significant differences in concentrations of OCs between seasons or between resident and migrant birds. Concentrations of DDE and oxychlordane were somewhat higher in migrant and resident birds during spring than in fall; however, concentrations were significantly different only for oxychlordane. Two resident birds collected in fall and spring had DDE residues >10 μg/g wet weight in carcass. There were no significant differences in $ δ^{13} $C and $ δ^{15} $N values among species, between seasons, or between migrant and resident birds. However, δD values were clearly different between species and helped differentiate migrant from resident birds. δD values also were negatively and significantly correlated with DDE concentrations in carcass. Birds with more depleted δD values in feathers tended to have higher DDE concentrations than those with less depleted δD values, suggesting a potential latitudinal accumulation of DDE. Overall, our results suggest that during fall and spring, there is not a significant buildup of persistent OCs in migrant and resident passerine insectivorous birds in northwest Michoacán, Mexico. | ||
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10.1007/s00244-007-9124-z doi (DE-627)OLC2070711307 (DE-He213)s00244-007-9124-z-p DE-627 ger DE-627 rakwb eng 333.7 610 VZ Mora, Miguel A. verfasserin aut Organochlorine Pollutants and Stable Isotopes in Resident and Migrant Passerine Birds from Northwest Michoacán, Mexico 2008 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media, LLC 2008 Abstract Although concentrations of organochlorine compounds (OCs) in birds from most of the United States and Canada have decreased over the last 30 years, there is still concern that migrant birds might be exposed to elevated concentrations of OCs during migration in Latin America. The Lerma-Chapala Basin in west-central Mexico is an important migration corridor and wintering area for many species. The objectives of this study were to assess if resident and migrant birds wintering in western Michoacán, Mexico accumulated elevated concentrations of OCs during fall and spring and to determine if the stable isotopes $ δ^{15} $N, $ δ^{13} $C, and δD could be used to predict burdens and origins of DDE accumulation. Resident and migrant passerine insectivorous birds were collected during fall and spring (2001–2002) in northwest Michoacán, near Chapala Lake, Mexico. The carcasses were analyzed for OCs and tail feathers were analyzed for stable isotopes $ δ^{15} $N, $ δ^{13} $C, and δD. The OCs detected in more than 50% of the samples were: oxychlordane (79%), p,p’-DDE (100%), p,p′-DDT (57%), and total PCBs (100%). p,p′-DDE was the OC detected at the highest concentrations, whereas residues of other OCs were near or below detection limits. Overall, there were no significant differences in concentrations of OCs between seasons or between resident and migrant birds. Concentrations of DDE and oxychlordane were somewhat higher in migrant and resident birds during spring than in fall; however, concentrations were significantly different only for oxychlordane. Two resident birds collected in fall and spring had DDE residues >10 μg/g wet weight in carcass. There were no significant differences in $ δ^{13} $C and $ δ^{15} $N values among species, between seasons, or between migrant and resident birds. However, δD values were clearly different between species and helped differentiate migrant from resident birds. δD values also were negatively and significantly correlated with DDE concentrations in carcass. Birds with more depleted δD values in feathers tended to have higher DDE concentrations than those with less depleted δD values, suggesting a potential latitudinal accumulation of DDE. Overall, our results suggest that during fall and spring, there is not a significant buildup of persistent OCs in migrant and resident passerine insectivorous birds in northwest Michoacán, Mexico. Migrant Bird Passerine Bird Total PCBs Tail Feather Resident Bird Enthalten in Archives of environmental contamination and toxicology Springer-Verlag, 1973 55(2008), 3 vom: 29. Jan., Seite 488-495 (DE-627)129397725 (DE-600)185986-9 (DE-576)01478100X 0090-4341 nnns volume:55 year:2008 number:3 day:29 month:01 pages:488-495 https://doi.org/10.1007/s00244-007-9124-z lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW GBV_ILN_21 GBV_ILN_31 GBV_ILN_70 GBV_ILN_130 GBV_ILN_2003 GBV_ILN_2006 GBV_ILN_2018 GBV_ILN_2360 GBV_ILN_4012 GBV_ILN_4112 GBV_ILN_4219 GBV_ILN_4277 AR 55 2008 3 29 01 488-495 |
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10.1007/s00244-007-9124-z doi (DE-627)OLC2070711307 (DE-He213)s00244-007-9124-z-p DE-627 ger DE-627 rakwb eng 333.7 610 VZ Mora, Miguel A. verfasserin aut Organochlorine Pollutants and Stable Isotopes in Resident and Migrant Passerine Birds from Northwest Michoacán, Mexico 2008 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media, LLC 2008 Abstract Although concentrations of organochlorine compounds (OCs) in birds from most of the United States and Canada have decreased over the last 30 years, there is still concern that migrant birds might be exposed to elevated concentrations of OCs during migration in Latin America. The Lerma-Chapala Basin in west-central Mexico is an important migration corridor and wintering area for many species. The objectives of this study were to assess if resident and migrant birds wintering in western Michoacán, Mexico accumulated elevated concentrations of OCs during fall and spring and to determine if the stable isotopes $ δ^{15} $N, $ δ^{13} $C, and δD could be used to predict burdens and origins of DDE accumulation. Resident and migrant passerine insectivorous birds were collected during fall and spring (2001–2002) in northwest Michoacán, near Chapala Lake, Mexico. The carcasses were analyzed for OCs and tail feathers were analyzed for stable isotopes $ δ^{15} $N, $ δ^{13} $C, and δD. The OCs detected in more than 50% of the samples were: oxychlordane (79%), p,p’-DDE (100%), p,p′-DDT (57%), and total PCBs (100%). p,p′-DDE was the OC detected at the highest concentrations, whereas residues of other OCs were near or below detection limits. Overall, there were no significant differences in concentrations of OCs between seasons or between resident and migrant birds. Concentrations of DDE and oxychlordane were somewhat higher in migrant and resident birds during spring than in fall; however, concentrations were significantly different only for oxychlordane. Two resident birds collected in fall and spring had DDE residues >10 μg/g wet weight in carcass. There were no significant differences in $ δ^{13} $C and $ δ^{15} $N values among species, between seasons, or between migrant and resident birds. However, δD values were clearly different between species and helped differentiate migrant from resident birds. δD values also were negatively and significantly correlated with DDE concentrations in carcass. Birds with more depleted δD values in feathers tended to have higher DDE concentrations than those with less depleted δD values, suggesting a potential latitudinal accumulation of DDE. Overall, our results suggest that during fall and spring, there is not a significant buildup of persistent OCs in migrant and resident passerine insectivorous birds in northwest Michoacán, Mexico. Migrant Bird Passerine Bird Total PCBs Tail Feather Resident Bird Enthalten in Archives of environmental contamination and toxicology Springer-Verlag, 1973 55(2008), 3 vom: 29. Jan., Seite 488-495 (DE-627)129397725 (DE-600)185986-9 (DE-576)01478100X 0090-4341 nnns volume:55 year:2008 number:3 day:29 month:01 pages:488-495 https://doi.org/10.1007/s00244-007-9124-z lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW GBV_ILN_21 GBV_ILN_31 GBV_ILN_70 GBV_ILN_130 GBV_ILN_2003 GBV_ILN_2006 GBV_ILN_2018 GBV_ILN_2360 GBV_ILN_4012 GBV_ILN_4112 GBV_ILN_4219 GBV_ILN_4277 AR 55 2008 3 29 01 488-495 |
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10.1007/s00244-007-9124-z doi (DE-627)OLC2070711307 (DE-He213)s00244-007-9124-z-p DE-627 ger DE-627 rakwb eng 333.7 610 VZ Mora, Miguel A. verfasserin aut Organochlorine Pollutants and Stable Isotopes in Resident and Migrant Passerine Birds from Northwest Michoacán, Mexico 2008 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media, LLC 2008 Abstract Although concentrations of organochlorine compounds (OCs) in birds from most of the United States and Canada have decreased over the last 30 years, there is still concern that migrant birds might be exposed to elevated concentrations of OCs during migration in Latin America. The Lerma-Chapala Basin in west-central Mexico is an important migration corridor and wintering area for many species. The objectives of this study were to assess if resident and migrant birds wintering in western Michoacán, Mexico accumulated elevated concentrations of OCs during fall and spring and to determine if the stable isotopes $ δ^{15} $N, $ δ^{13} $C, and δD could be used to predict burdens and origins of DDE accumulation. Resident and migrant passerine insectivorous birds were collected during fall and spring (2001–2002) in northwest Michoacán, near Chapala Lake, Mexico. The carcasses were analyzed for OCs and tail feathers were analyzed for stable isotopes $ δ^{15} $N, $ δ^{13} $C, and δD. The OCs detected in more than 50% of the samples were: oxychlordane (79%), p,p’-DDE (100%), p,p′-DDT (57%), and total PCBs (100%). p,p′-DDE was the OC detected at the highest concentrations, whereas residues of other OCs were near or below detection limits. Overall, there were no significant differences in concentrations of OCs between seasons or between resident and migrant birds. Concentrations of DDE and oxychlordane were somewhat higher in migrant and resident birds during spring than in fall; however, concentrations were significantly different only for oxychlordane. Two resident birds collected in fall and spring had DDE residues >10 μg/g wet weight in carcass. There were no significant differences in $ δ^{13} $C and $ δ^{15} $N values among species, between seasons, or between migrant and resident birds. However, δD values were clearly different between species and helped differentiate migrant from resident birds. δD values also were negatively and significantly correlated with DDE concentrations in carcass. Birds with more depleted δD values in feathers tended to have higher DDE concentrations than those with less depleted δD values, suggesting a potential latitudinal accumulation of DDE. Overall, our results suggest that during fall and spring, there is not a significant buildup of persistent OCs in migrant and resident passerine insectivorous birds in northwest Michoacán, Mexico. Migrant Bird Passerine Bird Total PCBs Tail Feather Resident Bird Enthalten in Archives of environmental contamination and toxicology Springer-Verlag, 1973 55(2008), 3 vom: 29. Jan., Seite 488-495 (DE-627)129397725 (DE-600)185986-9 (DE-576)01478100X 0090-4341 nnns volume:55 year:2008 number:3 day:29 month:01 pages:488-495 https://doi.org/10.1007/s00244-007-9124-z lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW GBV_ILN_21 GBV_ILN_31 GBV_ILN_70 GBV_ILN_130 GBV_ILN_2003 GBV_ILN_2006 GBV_ILN_2018 GBV_ILN_2360 GBV_ILN_4012 GBV_ILN_4112 GBV_ILN_4219 GBV_ILN_4277 AR 55 2008 3 29 01 488-495 |
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10.1007/s00244-007-9124-z doi (DE-627)OLC2070711307 (DE-He213)s00244-007-9124-z-p DE-627 ger DE-627 rakwb eng 333.7 610 VZ Mora, Miguel A. verfasserin aut Organochlorine Pollutants and Stable Isotopes in Resident and Migrant Passerine Birds from Northwest Michoacán, Mexico 2008 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media, LLC 2008 Abstract Although concentrations of organochlorine compounds (OCs) in birds from most of the United States and Canada have decreased over the last 30 years, there is still concern that migrant birds might be exposed to elevated concentrations of OCs during migration in Latin America. The Lerma-Chapala Basin in west-central Mexico is an important migration corridor and wintering area for many species. The objectives of this study were to assess if resident and migrant birds wintering in western Michoacán, Mexico accumulated elevated concentrations of OCs during fall and spring and to determine if the stable isotopes $ δ^{15} $N, $ δ^{13} $C, and δD could be used to predict burdens and origins of DDE accumulation. Resident and migrant passerine insectivorous birds were collected during fall and spring (2001–2002) in northwest Michoacán, near Chapala Lake, Mexico. The carcasses were analyzed for OCs and tail feathers were analyzed for stable isotopes $ δ^{15} $N, $ δ^{13} $C, and δD. The OCs detected in more than 50% of the samples were: oxychlordane (79%), p,p’-DDE (100%), p,p′-DDT (57%), and total PCBs (100%). p,p′-DDE was the OC detected at the highest concentrations, whereas residues of other OCs were near or below detection limits. Overall, there were no significant differences in concentrations of OCs between seasons or between resident and migrant birds. Concentrations of DDE and oxychlordane were somewhat higher in migrant and resident birds during spring than in fall; however, concentrations were significantly different only for oxychlordane. Two resident birds collected in fall and spring had DDE residues >10 μg/g wet weight in carcass. There were no significant differences in $ δ^{13} $C and $ δ^{15} $N values among species, between seasons, or between migrant and resident birds. However, δD values were clearly different between species and helped differentiate migrant from resident birds. δD values also were negatively and significantly correlated with DDE concentrations in carcass. Birds with more depleted δD values in feathers tended to have higher DDE concentrations than those with less depleted δD values, suggesting a potential latitudinal accumulation of DDE. Overall, our results suggest that during fall and spring, there is not a significant buildup of persistent OCs in migrant and resident passerine insectivorous birds in northwest Michoacán, Mexico. Migrant Bird Passerine Bird Total PCBs Tail Feather Resident Bird Enthalten in Archives of environmental contamination and toxicology Springer-Verlag, 1973 55(2008), 3 vom: 29. Jan., Seite 488-495 (DE-627)129397725 (DE-600)185986-9 (DE-576)01478100X 0090-4341 nnns volume:55 year:2008 number:3 day:29 month:01 pages:488-495 https://doi.org/10.1007/s00244-007-9124-z lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW GBV_ILN_21 GBV_ILN_31 GBV_ILN_70 GBV_ILN_130 GBV_ILN_2003 GBV_ILN_2006 GBV_ILN_2018 GBV_ILN_2360 GBV_ILN_4012 GBV_ILN_4112 GBV_ILN_4219 GBV_ILN_4277 AR 55 2008 3 29 01 488-495 |
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10.1007/s00244-007-9124-z doi (DE-627)OLC2070711307 (DE-He213)s00244-007-9124-z-p DE-627 ger DE-627 rakwb eng 333.7 610 VZ Mora, Miguel A. verfasserin aut Organochlorine Pollutants and Stable Isotopes in Resident and Migrant Passerine Birds from Northwest Michoacán, Mexico 2008 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media, LLC 2008 Abstract Although concentrations of organochlorine compounds (OCs) in birds from most of the United States and Canada have decreased over the last 30 years, there is still concern that migrant birds might be exposed to elevated concentrations of OCs during migration in Latin America. The Lerma-Chapala Basin in west-central Mexico is an important migration corridor and wintering area for many species. The objectives of this study were to assess if resident and migrant birds wintering in western Michoacán, Mexico accumulated elevated concentrations of OCs during fall and spring and to determine if the stable isotopes $ δ^{15} $N, $ δ^{13} $C, and δD could be used to predict burdens and origins of DDE accumulation. Resident and migrant passerine insectivorous birds were collected during fall and spring (2001–2002) in northwest Michoacán, near Chapala Lake, Mexico. The carcasses were analyzed for OCs and tail feathers were analyzed for stable isotopes $ δ^{15} $N, $ δ^{13} $C, and δD. The OCs detected in more than 50% of the samples were: oxychlordane (79%), p,p’-DDE (100%), p,p′-DDT (57%), and total PCBs (100%). p,p′-DDE was the OC detected at the highest concentrations, whereas residues of other OCs were near or below detection limits. Overall, there were no significant differences in concentrations of OCs between seasons or between resident and migrant birds. Concentrations of DDE and oxychlordane were somewhat higher in migrant and resident birds during spring than in fall; however, concentrations were significantly different only for oxychlordane. Two resident birds collected in fall and spring had DDE residues >10 μg/g wet weight in carcass. There were no significant differences in $ δ^{13} $C and $ δ^{15} $N values among species, between seasons, or between migrant and resident birds. However, δD values were clearly different between species and helped differentiate migrant from resident birds. δD values also were negatively and significantly correlated with DDE concentrations in carcass. Birds with more depleted δD values in feathers tended to have higher DDE concentrations than those with less depleted δD values, suggesting a potential latitudinal accumulation of DDE. Overall, our results suggest that during fall and spring, there is not a significant buildup of persistent OCs in migrant and resident passerine insectivorous birds in northwest Michoacán, Mexico. Migrant Bird Passerine Bird Total PCBs Tail Feather Resident Bird Enthalten in Archives of environmental contamination and toxicology Springer-Verlag, 1973 55(2008), 3 vom: 29. Jan., Seite 488-495 (DE-627)129397725 (DE-600)185986-9 (DE-576)01478100X 0090-4341 nnns volume:55 year:2008 number:3 day:29 month:01 pages:488-495 https://doi.org/10.1007/s00244-007-9124-z lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW GBV_ILN_21 GBV_ILN_31 GBV_ILN_70 GBV_ILN_130 GBV_ILN_2003 GBV_ILN_2006 GBV_ILN_2018 GBV_ILN_2360 GBV_ILN_4012 GBV_ILN_4112 GBV_ILN_4219 GBV_ILN_4277 AR 55 2008 3 29 01 488-495 |
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Mora, Miguel A. ddc 333.7 misc Migrant Bird misc Passerine Bird misc Total PCBs misc Tail Feather misc Resident Bird Organochlorine Pollutants and Stable Isotopes in Resident and Migrant Passerine Birds from Northwest Michoacán, Mexico |
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Organochlorine Pollutants and Stable Isotopes in Resident and Migrant Passerine Birds from Northwest Michoacán, Mexico |
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Organochlorine Pollutants and Stable Isotopes in Resident and Migrant Passerine Birds from Northwest Michoacán, Mexico |
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organochlorine pollutants and stable isotopes in resident and migrant passerine birds from northwest michoacán, mexico |
title_auth |
Organochlorine Pollutants and Stable Isotopes in Resident and Migrant Passerine Birds from Northwest Michoacán, Mexico |
abstract |
Abstract Although concentrations of organochlorine compounds (OCs) in birds from most of the United States and Canada have decreased over the last 30 years, there is still concern that migrant birds might be exposed to elevated concentrations of OCs during migration in Latin America. The Lerma-Chapala Basin in west-central Mexico is an important migration corridor and wintering area for many species. The objectives of this study were to assess if resident and migrant birds wintering in western Michoacán, Mexico accumulated elevated concentrations of OCs during fall and spring and to determine if the stable isotopes $ δ^{15} $N, $ δ^{13} $C, and δD could be used to predict burdens and origins of DDE accumulation. Resident and migrant passerine insectivorous birds were collected during fall and spring (2001–2002) in northwest Michoacán, near Chapala Lake, Mexico. The carcasses were analyzed for OCs and tail feathers were analyzed for stable isotopes $ δ^{15} $N, $ δ^{13} $C, and δD. The OCs detected in more than 50% of the samples were: oxychlordane (79%), p,p’-DDE (100%), p,p′-DDT (57%), and total PCBs (100%). p,p′-DDE was the OC detected at the highest concentrations, whereas residues of other OCs were near or below detection limits. Overall, there were no significant differences in concentrations of OCs between seasons or between resident and migrant birds. Concentrations of DDE and oxychlordane were somewhat higher in migrant and resident birds during spring than in fall; however, concentrations were significantly different only for oxychlordane. Two resident birds collected in fall and spring had DDE residues >10 μg/g wet weight in carcass. There were no significant differences in $ δ^{13} $C and $ δ^{15} $N values among species, between seasons, or between migrant and resident birds. However, δD values were clearly different between species and helped differentiate migrant from resident birds. δD values also were negatively and significantly correlated with DDE concentrations in carcass. Birds with more depleted δD values in feathers tended to have higher DDE concentrations than those with less depleted δD values, suggesting a potential latitudinal accumulation of DDE. Overall, our results suggest that during fall and spring, there is not a significant buildup of persistent OCs in migrant and resident passerine insectivorous birds in northwest Michoacán, Mexico. © Springer Science+Business Media, LLC 2008 |
abstractGer |
Abstract Although concentrations of organochlorine compounds (OCs) in birds from most of the United States and Canada have decreased over the last 30 years, there is still concern that migrant birds might be exposed to elevated concentrations of OCs during migration in Latin America. The Lerma-Chapala Basin in west-central Mexico is an important migration corridor and wintering area for many species. The objectives of this study were to assess if resident and migrant birds wintering in western Michoacán, Mexico accumulated elevated concentrations of OCs during fall and spring and to determine if the stable isotopes $ δ^{15} $N, $ δ^{13} $C, and δD could be used to predict burdens and origins of DDE accumulation. Resident and migrant passerine insectivorous birds were collected during fall and spring (2001–2002) in northwest Michoacán, near Chapala Lake, Mexico. The carcasses were analyzed for OCs and tail feathers were analyzed for stable isotopes $ δ^{15} $N, $ δ^{13} $C, and δD. The OCs detected in more than 50% of the samples were: oxychlordane (79%), p,p’-DDE (100%), p,p′-DDT (57%), and total PCBs (100%). p,p′-DDE was the OC detected at the highest concentrations, whereas residues of other OCs were near or below detection limits. Overall, there were no significant differences in concentrations of OCs between seasons or between resident and migrant birds. Concentrations of DDE and oxychlordane were somewhat higher in migrant and resident birds during spring than in fall; however, concentrations were significantly different only for oxychlordane. Two resident birds collected in fall and spring had DDE residues >10 μg/g wet weight in carcass. There were no significant differences in $ δ^{13} $C and $ δ^{15} $N values among species, between seasons, or between migrant and resident birds. However, δD values were clearly different between species and helped differentiate migrant from resident birds. δD values also were negatively and significantly correlated with DDE concentrations in carcass. Birds with more depleted δD values in feathers tended to have higher DDE concentrations than those with less depleted δD values, suggesting a potential latitudinal accumulation of DDE. Overall, our results suggest that during fall and spring, there is not a significant buildup of persistent OCs in migrant and resident passerine insectivorous birds in northwest Michoacán, Mexico. © Springer Science+Business Media, LLC 2008 |
abstract_unstemmed |
Abstract Although concentrations of organochlorine compounds (OCs) in birds from most of the United States and Canada have decreased over the last 30 years, there is still concern that migrant birds might be exposed to elevated concentrations of OCs during migration in Latin America. The Lerma-Chapala Basin in west-central Mexico is an important migration corridor and wintering area for many species. The objectives of this study were to assess if resident and migrant birds wintering in western Michoacán, Mexico accumulated elevated concentrations of OCs during fall and spring and to determine if the stable isotopes $ δ^{15} $N, $ δ^{13} $C, and δD could be used to predict burdens and origins of DDE accumulation. Resident and migrant passerine insectivorous birds were collected during fall and spring (2001–2002) in northwest Michoacán, near Chapala Lake, Mexico. The carcasses were analyzed for OCs and tail feathers were analyzed for stable isotopes $ δ^{15} $N, $ δ^{13} $C, and δD. The OCs detected in more than 50% of the samples were: oxychlordane (79%), p,p’-DDE (100%), p,p′-DDT (57%), and total PCBs (100%). p,p′-DDE was the OC detected at the highest concentrations, whereas residues of other OCs were near or below detection limits. Overall, there were no significant differences in concentrations of OCs between seasons or between resident and migrant birds. Concentrations of DDE and oxychlordane were somewhat higher in migrant and resident birds during spring than in fall; however, concentrations were significantly different only for oxychlordane. Two resident birds collected in fall and spring had DDE residues >10 μg/g wet weight in carcass. There were no significant differences in $ δ^{13} $C and $ δ^{15} $N values among species, between seasons, or between migrant and resident birds. However, δD values were clearly different between species and helped differentiate migrant from resident birds. δD values also were negatively and significantly correlated with DDE concentrations in carcass. Birds with more depleted δD values in feathers tended to have higher DDE concentrations than those with less depleted δD values, suggesting a potential latitudinal accumulation of DDE. Overall, our results suggest that during fall and spring, there is not a significant buildup of persistent OCs in migrant and resident passerine insectivorous birds in northwest Michoacán, Mexico. © Springer Science+Business Media, LLC 2008 |
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