multiple density-dependence mechanisms regulate a migratory bird population during the breeding season.the mechanisms regulating bird populations are poorly understood and controversial. we provide evidence that a migratory songbird, the black-throated blue warbler (dendroica caerulescens), is regulated by multiple density-dependence mechanisms in its breeding quarters. evidence of regulation includes: stability in population density during 1969-2002, strong density dependence in time-series analyses of this period, an inverse relationship between warbler density and annual fecundity, and a posit ...200314561272
warm springs, early lay dates, and double brooding in a north american migratory songbird, the black-throated blue warbler.numerous studies have correlated the advancement of lay date in birds with warming climate trends, yet the fitness effects associated with this phenological response have been examined in only a small number of species. most of these species--primarily insectivorous cavity nesters in europe--exhibit fitness declines associated with increasing asynchrony with prey. here, we use 25 years of demographic data, collected from 1986 to 2010, to examine the effects of spring temperature on breeding init ...201323565154
the interacting effects of food, spring temperature, and global climate cycles on population dynamics of a migratory songbird.although long-distance migratory songbirds are widely believed to be at risk from warming temperature trends, species capable of attempting more than one brood in a breeding season could benefit from extended breeding seasons in warmer springs. to evaluate local and global factors affecting population dynamics of the black-throated blue warbler (setophaga caerulescens), a double-brooded long-distance migrant, we used pradel models to analyze 25 years of mark-recapture data collected in new hamps ...201626242236
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