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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Observations of predation by corvids at a Marbled Murrelet nest
Auteurs :	Percy N. Hebert, Auteur ; Richard T. Golightly, Auteur
Type de document :	Article
Dans :	Journal of Field Ornithology (78(2) JUN 2007)
Article en page(s) :	221-224
Langues:	Anglais
Résumé :	Unlike other alcids, Marbled Murrelets (Brachyramphus marmoratus) typically nest solitarily on large platforms in the upper canopy of old-growth coniferous trees. Although Marbled Murrelets exhibit characteristics that minimize the risk of predation, habitat fragmentation has likely increased the risk of nest predation by corvids. Using a video camera at a nest in northern California, we observed nest fates for 4 yr (2002-2005). These recordings revealed two cases of egg predation by a Steller's Jay (Cyanocitta stelleri) and a Common Raven (Corvus corax), respectively. In both instances, the egg was carried from the nest site, leaving no evidence that nesting had occurred. Our observations revealed (1) the need to be conservative in estimates of nesting attempts and nesting success of Marbled Murrelets based only on the presence or absence of eggshell fragments or feces, (2) that not all predation attempts were successful, and (3) that murrelets may be more susceptible to predation early in the incubation period when adults may be less attentive to eggs and, after hatching, when young are less than 14 d old. We encourage efforts to minimize anthropogenic activities that may increase local corvid densities or disturb murrelets during the early incubation period.

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