Temporal and sex-based variation in organochlorine pesticide levels in the blue-footed booby in two coastal colonies of Sinaloa, Mexico

The temporal, inter-site, and sex-based variation of 19 organochlorine pesticides (OCPs) in blood plasma samples collected from blue-footed boobies of two islands in Sinaloa, Mexico, was evaluated. The effect of OCPs was evaluated with the heterophil/lymphocyte ratio, micronucleated erythrocyte freq...

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Bibliographic Details
Published in:Marine pollution bulletin 2021-03, Vol.164, p.112050, Article 112050
Main Authors: Piña-Ortiz, Alberto, Ceyca-Contreras, Juan Pablo, Covantes-Rosales, Carlos Eduardo, Betancourt-Lozano, Miguel, Castillo-Guerrero, José Alfredo
Format: Article
Language:English
Subjects:
Animals
Biomarker
Birds
Coastal ecosystem
Ecosystem
Environmental Monitoring
Humans
Hydrocarbons, Chlorinated
Mexico
Organochlorine pesticide
Pesticides
Sentinel species
Sex-related difference
Sula nebouxii
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Summary:The temporal, inter-site, and sex-based variation of 19 organochlorine pesticides (OCPs) in blood plasma samples collected from blue-footed boobies of two islands in Sinaloa, Mexico, was evaluated. The effect of OCPs was evaluated with the heterophil/lymphocyte ratio, micronucleated erythrocyte frequency, and scaled mass index. The OCP-group levels decreased as the breeding season progressed, and interannual (but not inter-colony) differences were detected. Intra-annual variation in OCP levels seemed to reflect run-off inputs, although other environmental processes may better explain the variation between years. Sex-based differences in OCP levels were likely related to ecological and physiological processes linked to breeding (e.g., egg-laying and use of lipid reserves). No correlations between OCP-group levels and biomarkers were detected. Small pelagic fishes are the main prey sources of blue-footed boobies and the targets of regional industrial fisheries, and thus blue-footed booby OCP levels could reflect ecosystem health and indicate potential risks for human consumers. [Display omitted] •Sex-based differences in OCP levels are likely related to breeding physiology.•OCP levels decreased as the breeding season progressed•Interannual but not intercolony differences in OCP levels were detected.•Blue-footed booby OCP levels likely reflect ecosystem health.
ISSN:0025-326X
1879-3363
DOI:10.1016/j.marpolbul.2021.112050