Midwest Peregrine Falcon demography, 1982-1995

Harrison B. Tordoff, Patrick T. Redig

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

Peregrine Falcon (Falco peregrinus) restoration in the midwestern U.S. has resulted in a growing population estimated in 1995 to consist of 67 pairs. Dispersal from hack or natal sites has huge variation, but mean dispersal distance of females (320 km) is about twice that of males (176 km). Minimum first-year survival is 23% but actual first-year survival probably exceeds 30%. Annual survival of territorial adults is 86% (93% for females and 79% for males). Age at first breeding is usually two years although some females and a few males begin breeding at one year of age. Peregrines seem not to delay first breeding beyond two years by choice. Only a small proportion of birds fledged become breeders. Successful individuals vary greatly in productivity, which is correlated with life span. Fidelity to territory is strong, but territorial shifts do occur. Mate fidelity appears to be a by-product of territorial fidelity. The midwestern population of peregrines appears to be secure. Reproduction and survival are adequate to permit growth to current carrying capacity although 80% of the peregrines nest on manmade structures and only 20% on cliffs.

Original languageEnglish (US)
Pages (from-to)339-346
Number of pages8
JournalJournal of Raptor Research
Volume31
Issue number4
StatePublished - Dec 1 1997

Keywords

  • Falco peregrinus
  • Midwest U.S
  • Natal dispersal
  • Peregrine falcon
  • Productivity, nest-site fidelity
  • Survival

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