Western Snowy Plovers Charadrius alexandrinus nivosus select nesting substrates that enhance egg crypsis and improve nest survival

作者: MARK A. COLWELL , JASON J. MEYER , MICHAEL A. HARDY , SEAN E. MCALLISTER , AMBER N. TRANSOU

DOI: 10.1111/J.1474-919X.2011.01100.X

关键词: Reproductive successCrypsisHabitatPredationNestBiologyCharadriidaePopulationEcologyThreatened species

摘要: Predation is an important cause of nest failure for many birds and has shaped the lifehistory characteristics species, especially ground-nesting shorebirds. We examined nesting success, causes clutch survival in relation to variation substrate a colour-marked population Western Snowy Plovers Charadrius alexandrinus nivosus breeding on riverine gravel bars coastal northern California. experienced higher success than nearby beaches, which were characterized by more homogeneous, sandy substrates. On bars, nested habitats large, heterogeneous substrates, with egg-sized stones, compared random sites. Egg crypsis, as indexed time required naive observer detect nest, increased number Nest correlated negatively heterogeneity substrates positively stones. Consistently high indicates that this high-quality habitat deserves special management considerations given species’ threatened status.

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