ACORN-STORING BY THE CALIFORNIA WOODPECKER By WILLIAM E. RITTER
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Seasonal Body Weight Variation in Five Species of Woodpeckers
We investigated patterns of seasonal variation in body weight in six populations of five resident species of temperate-zone woodpeckers: Acorn Woodpecker (Melanerpes formicivorus), Red-bellied Woodpecker (M. carolinus), Red-cockaded Woodpecker (Picoides borealis), Downy Woodpecker (P. pubescens), and Great Spotted Woodpecker (Dendrocopos major). After controlling for time of day and overall bod...
متن کاملTree community shifts and Acorn Woodpecker population increases over three decades in a Californian oak woodland
Forest communities change in response to shifting climate, changing land use, and species introductions, as well as the interactions of established species. We surveyed the oak (Quercus L. spp.) community and Acorn Woodpecker (Melanerpes formicivorus (Swainson, 1827)) population within 230 ha of oak forest and savanna in central coastal California in 1979 and 2013 to assess demographic changes ...
متن کاملOaks, acorns, and the geographical ecology of acorn woodpeckers
We investigated the geographical ecology of acorn woodpeckers (Melanerpes formicivorus) using 30 years of Audubon Christmas Bird Counts and data on the diversity and abundance of oaks. Spatial autocorrelation in acorn woodpecker population densities is not significantly greater than zero both in either the southwestern United States, where populations are often locally isolated, or along the Pa...
متن کاملAcorn woodpeckers: Helping at the nest, polygynandry, and dependence on a variable acorn crop
Th e acorn woodpecker ( Melanerpes formicivorus ) plays an important role in the history of cooperative breeding. It was one of the earliest species for which cooperative breeding was noted with more than two individuals feeding at a single nest as well as apparent mate-sharing (Myers 1915 ; Leach 1925 ; Michael 1927 ). Subsequently, in his classic Animal Dispersion in Relation to Social Behavi...
متن کاملWhat we don't know, and what needs to be known, about the coopera- tively breeding Acorn Woodpecker Melanerpes formicivorus
The Acorn Woodpecker Melanerpes formicivorus is one of a small number of woodpecker species that are cooperative breeders, living in family groups of up to 15 individuals of both sexes and all ages and exhibiting a complex mating system involving multiple cobreeders of both sexes (polygynandry). Although much has been learned concerning the social organisation and ecology of this species, over ...
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تاریخ انتشار 2001