Reproductive success and eggshell thinning of a reestablished peregrine falcon population

R. J. Steidl, C. R. Griffin, L. J. Niles, K. E. Clark

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


Examined numbers of Falco peregrinus pairs, reproductive success, and eggshell thinning in New Jersey during 1979-88. Productivity of these falcons (mean 1.38 young fledged/pair) was comparable with that of stable populations, but productivity was lower for pairs near Delaware Bay and River (0.58 young/pair) compared to those in other regions of New Jersey (1.55 young/pair). Lower productivity and nest success of 4 pairs near Delaware Bay and River studied in both 1987 and 1988 were due to low hatching success and predation, probably by great horned owls Bubo virginianus. During 1985-88 eggshell thickness from New Jersey peregrines averaged 16.4% below pre-DDT levels and apparently has decreased steadily since 1979. This decrease in eggshell thickness statewide suggests that falcons continue to be exposed to environmental contaminants. -from Authors

Original languageEnglish (US)
Pages (from-to)294-299
Number of pages6
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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