Differential Reproductive Success of Ospreys in New Jersey. Steidl, R., J., Griffin, C., R., & Niles, L., J. Journal of Wildlife Management, 55(2):266-272, 1991. abstract bibtex To determine factors responsible for low productivity of ospreys (Pandion haliaetus) nesting along Delaware Bay, we compared their reproductive success to birds nesting along the Atlantic Coast during 1987 and 1988. Productivity of ospreys nesting along Delaware Bay was lower because 50% of all nests initiated failed, whereas only 21% of Atlantic Coast nests failed. Only 50% of all eggs laid in the Bay colony hatched, compared to 69% in the Atlantic Coast colony. Nestling mortality was similar between colonies (26 vs. 18% for Delaware Bay and Atlantic Coast, respectively) but 21% of those young hatched near the Bay were probably preyed upon by great horned owls (Bubo virginianus). Although Delaware Bay ospreys spent considerably more time away from their nests, presumably foraging, than did Atlantic Coast birds, adults from both colonies spent similar amounts of time feeding young, which suggests that food stress did not influence productivity. High frequency of unhatched eggs and thinner eggshells (8% below pre-DDT levels vs. 3% for Atlantic Coast eggs) of ospreys along Delaware Bay suggests possible exposure to environmental contaminants that may reduce hatching success.
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title = {Differential Reproductive Success of Ospreys in New Jersey},
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abstract = {To determine factors responsible for low productivity of ospreys (Pandion haliaetus) nesting along Delaware Bay, we compared their reproductive success to birds nesting along the Atlantic Coast during 1987 and 1988. Productivity of ospreys nesting along Delaware Bay was lower because 50% of all nests initiated failed, whereas only 21% of Atlantic Coast nests failed. Only 50% of all eggs laid in the Bay colony hatched, compared to 69% in the Atlantic Coast colony. Nestling mortality was similar between colonies (26 vs. 18% for Delaware Bay and Atlantic Coast, respectively) but 21% of those young hatched near the Bay were probably preyed upon by great horned owls (Bubo virginianus). Although Delaware Bay ospreys spent considerably more time away from their nests, presumably foraging, than did Atlantic Coast birds, adults from both colonies spent similar amounts of time feeding young, which suggests that food stress did not influence productivity. High frequency of unhatched eggs and thinner eggshells (8% below pre-DDT levels vs. 3% for Atlantic Coast eggs) of ospreys along Delaware Bay suggests possible exposure to environmental contaminants that may reduce hatching success.},
bibtype = {article},
author = {Steidl, Robert J. and Griffin, Curtice R. and Niles, Lawrence J.},
journal = {Journal of Wildlife Management},
number = {2}
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