Long-lasting chemical contaminants may still be persisting in the Chesapeake Bay region, but the pollutants have had no significant effect on the world’s largest breeding population of ospreys, according to a report from the U.S. Geological Survey (USGS).
While the three-year study found some residue of pesticides and industrial chemicals in the Bay’s tidal waters, fish, osprey eggs and osprey chicks, researchers did not find a connection between the fish hawk’s exposure to the chemicals and its success in the Chesapeake region.
“Osprey populations are thriving almost everywhere in the Chesapeake,” Rebecca Lazarus, a researcher at the USGS’ Patuxent Wildlife Research Center and the lead author of the report, said in a release. “We found them nesting in some of the most highly contaminated areas in the Bay and we did not find any relationship between contaminants and their nests' productivity.”
Widespread use of DDT in the mid-twentieth century caused the Bay’s osprey population to fall to fewer than 1,500 pairs before the pesticide was banned in the United States in 1972. Close to 10,000 pairs of osprey are expected to nest in the Chesapeake region this year.
To hear Lazarus describe osprey life history and her research, watch our Bay 101: Ospreys video:
The study, "Chesapeake Bay fish–osprey food chain: Evaluation of contaminant exposure and genetic damage," is available online from the journal Environmental Toxicology and Chemistry.