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Image of the Day: A Good Egg

Osprey numbers are recovering after a drop in contaminants in the Delaware Estuary.

Jul 18, 2018
Sukanya Charuchandra

ABOVE: Two osprey nestlings in the Delaware Estuary
REBECCA S. LAZARUS, USGS

Compared to the years spanning the 1970s through the early 2000s, the amounts of environmental pollutants have fallen in osprey eggs from the Delaware Estuary, according to research published in Science of the Total Environment.

The water quality of the estuary worsened during the latter half of the last century due to contamination from urbanization, agriculture, and shipping, leading to a decline in the numbers of predatory birds such as ospreys. 

Osprey nestlings and an unhatched egg in the Delaware Estuary
REBECCA S. LAZARUS, USGS

Unlike in previous surveys, the researchers observed no thinning of osprey eggshells this time around. This was accompanied by no issues with egg hatching, no loss of eggs or hatchlings, and no impairment in the capability of young ones to leave the nest. 

“We are seeing less contamination now in the Delaware Estuary, and this likely reflects reduced pollution and ongoing cleanup efforts by local, state, and federal governments as well as conservation groups, the public, and other organizations working together to improve the estuary’s health, ultimately helping with the upswing in breeding success for ospreys,” coauthor Barnett Rattner, an ecotoxicologist for the U.S. Geological Survey, says in a statement.  According to Rattner, these results “will help inform decisions to continue progress and further enhance the environmental quality of the ecosystem.”

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