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1 June 2005 EXTREMELY LOW NESTING SUCCESS AND CHARACTERISTICS OF LIFE HISTORY TRAITS IN AN INSULAR POPULATION OF PARUS VARIUS NAMIYEI
NORIYUKI YAMAGUCHI, HIROYOSHI HIGUCHI
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Abstract

Differing intensities of predation pressure can affect the evolution of life history traits in island and mainland populations. We found extremely low nesting success in an insular subspecies of the Varied Tit (Parus varius namiyei; Kozushima Island), and we compared certain life history traits among three subspecies of P. varius experiencing different predation pressures. The nesting success of P. v. namiyei was extremely low as a result of significant nest predation and nest abandonment; 83% of active nests failed due to snake predation. The proportion of depredated nests was significantly greater on Kozushima Island than on Miyakejima Island (P. v. owstoni) or on the mainland (P. v. varius). Of the three subspecies, P. v. namiyei had the longest incubation period, shortest nestling period, an intermediate clutch size, and a small brood size. There were no differences in the date of egg laying among the three populations. The short nestling period for P. v. namiyei may be an adaptive response, as the predation risk during the nestling period on Kozushima was extremely high.

NORIYUKI YAMAGUCHI and HIROYOSHI HIGUCHI "EXTREMELY LOW NESTING SUCCESS AND CHARACTERISTICS OF LIFE HISTORY TRAITS IN AN INSULAR POPULATION OF PARUS VARIUS NAMIYEI," The Wilson Bulletin 117(2), 189-193, (1 June 2005). https://doi.org/10.1676/04-081
Received: 3 August 2004; Accepted: 1 March 2005; Published: 1 June 2005
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