Stable isotopes of carbon and nitrogen in the study of organochlorine contaminants in albatrosses and petrels |
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Authors: | Fernanda I Colabuono Viviane Barquete Satie Taniguchi Peter G Ryan Rosalinda C Montone |
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Institution: | 1. Universidade de São Paulo, Instituto Oceanográfico, Laboratório de Química Orgânica Marinha, Pça. do Oceanográfico, 191, CEP 05508120 São Paulo, SP, Brazil;2. Percy FitzPatrick Institute, DST/NRF Centre of Excellence, University of Cape Town, Rondebosch 7701, South Africa |
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Abstract: | Carbon and nitrogen stable isotopes in albatrosses and petrels collected off southern Brazil were compared with concentrations of organochlorine contaminants (OCs). δ13C and δ15N values, as well as OCs concentrations, exhibited a high degree of variability among individuals and overlap among species. δ13C values reflected latitudinal differences among species, with lower values found in Wandering and Tristan Albatrosses and higher values found in Black-browed and Atlantic Yellow-nosed Albatrosses and White-chinned Petrels. Some relationships were found between OCs and stable isotopes, but in general a partial ‘uncoupling’ was observed between OCs concentrations and stable isotopes ratios (especially for δ15N). δ13C and δ15N values in Procellariiformes tissues during the non-breeding season appear to be a better indicator of foraging habitats than of trophic relationships, which may partially explain the high degree of variability between concentrations of OCs and stable isotopes ratios in birds with a diversified diet and wide foraging range. |
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Keywords: | Procellariiformes Stable isotopes Polychlorinated biphenyls Organochlorine pesticides Brazil |
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