Differential reproductive success of ospreys in New Jersey

R. J. Steidl, C. R. Griffin, L. J. Niles

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Productivity of Pandion haliaetus along Delaware Bay was low 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, 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. -from Authors

Original languageEnglish (US)
Pages (from-to)266-272
Number of pages7
JournalJournal of Wildlife Management
Issue number2
StatePublished - 1991

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Nature and Landscape Conservation


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