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Birds exposed to PCBs as nestlings show behavior changes as adults

Birds exposed to PCBs as nestlings show behavior changes as adults


PCB
PCB warning label affixed to a railroad signal power supply transformer dating from the 1930’s at CP-SLOPE interlocking, west of Altoona, PA on the Norfolk Southern Pittsburgh Line. Credit: Sturmovik/Wikipedia

According to a new study, zebra finches exposed to low levels of environmental PCBs as nestlings show changes in breeding behavior as adults. The study published in the journal PLoS ONE was conducted by scientists at the Cornell Lab of Ornithology. Though polychlorinated biphenyls, or PCBs, were banned in 1979, they still contaminate the environment because of improper disposal.

“Decades of work has shown that high levels of PCB-exposure can be toxic and carcinogenic, but less is known about low levels of PCB exposure,” explains lead author Sara DeLeon, who conducted the research as part of her doctoral studies at Cornell University. “PCBs are , meaning that even very low levels could be mimicking the effects of hormones, and potentially influencing behavior.”

The researchers investigated the effects of two kinds of PCBs used by industry. Nestling zebra finches were exposed to low levels of PCBs for seven days to mimic exposure to contaminated food that parent birds in the wild would deliver to their young.

“Our results show that this level of PCB exposure during development does have consequences on adult reproductive behavior,” says DeLeon. “Male finches exposed to PCBs during development sang fewer syllables as adults. Depending on the type of PCB treatment, some finches made more nesting attempts and also abandoned nests more often.”

Some young fledged significantly earlier than normal. DeLeon says these results are likely the result of increased aggression between males.

“Our findings suggest that sub-lethal PCB-exposure during development can change key reproductive characteristics of adult , likely reducing fitness in the wild,” concludes DeLeon.


Even low-level PCBs change bird songs


More information:
Sara DeLeon et al, Developmental polychlorinated biphenyl exposure influences adult zebra finch reproductive behaviour, PLOS ONE (2020). DOI: 10.1371/journal.pone.0230283

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Citation:
Birds exposed to PCBs as nestlings show behavior changes as adults (2020, March 26)
retrieved 27 March 2020
from https://phys.org/news/2020-03-birds-exposed-pcbs-nestlings-behavior.html

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