Seasonal Differences in Contaminant Accumulation in Neotropical Migrant and Resident Songbirds.
Academic Article
Overview
Research
Identity
Additional Document Info
Other
View All
Overview
abstract
For many years, it has been hypothesized that Neotropical migrants breeding in the United States and Canada accumulate organochlorine pesticides (OCPs) while on their wintering grounds in Latin America. We investigated the seasonal accumulation of persistent organic pollutant (POPs) in migrant and resident passerines in Texas, Yucatn, and Costa Rica collected during the fall, winter, and spring from 2011 to 2013. A total of 153 birds were collected, and all contained detectable levels of polychlorinated biphenyls (PCBs), polybrominated diphenyl ethers (PBDEs), and OCPs with dichlorodiphenyldichloroethylene (DDE) being the most predominant pesticide. OCPs and PCBs were the predominant contaminants, accounting for80% of the total POPs burden, whereas PBDEs accounted for16%. Only spring migrants from Texas had significantly greater DDE concentrations (64.6ng/gdry weight [dw]) than migrants collected in Costa Rica (23.2ng/gdw). Resident birds in Texas had significantly greater levels of DDE (121ng/g dw) and PBDEs (34.8ng/gdw) compared with residents in Yucatn and Costa Rica. For PCBs, resident birds from Costa Rica had significantly lower concentrations (9.60ng/gdw) compared with their migrant counterparts (43.7ng/gdw) and residents from Texas (48.3ng/gdw) and the Yucatn (32.1ng/gdw). Migrant and resident passerines had similar congener profiles for PCBs and PBDEs suggesting similar exposure and retention of these contaminants. No significant accumulation of DDE was observed in migrants while on their wintering grounds. Relatively high concentrations of PBDEs in resident birds from Costa Rica warrant future studies of PBDE contamination in Latin America.
