A Quantitative Study of Foraging of Male and Female Spruce-Woods Warblers

摘要: Males of four congeneric species wood warblers (Parulidae) inhabiting a spruce forest coastal Maine were found to forage higher than their females. They the Magnolia (Dendroica Magnolia), Myrtle (D. coronata), Black—throat Green virens), and Blackburnian fusca) warblers. The foraging areas males nearer height singing nests, while females nest perches males. Very few differences observed between sexes in part tree utilized (proximal parts limbs, tips foliage, etc.) During period incubation, rates became noticeably greater those males; before after this less pronounced or non—existent. partitioning results situation where can readily remaining maximally conspicuous, an area adjacent nests. t...