The Grasshopper Sparrow in Maine, and Other Notes
نویسندگان
چکیده
منابع مشابه
First Documented Cases of Polygyny in the Grasshopper Sparrow
—We studied the breeding biology of Grasshopper Sparrows (Ammodramus savannarum) on restored grasslands in Maryland from 1999 to present. We report the first documented cases of social polygyny in this species. Polygyny increased reproductive success for males in two of four cases, but its rarity suggests it is only a facultative behavior for this usually socially monogamous species Received 31...
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Please cite this article in press as: Jill A. Soha (2009), doi:10.1016/j.anbehav.2009.02.021 T E D P R O Adult male grasshopper sparrows sing two structurally and functionally distinct songs: buzz song and warble song. To investigate how these songs develop, we tutored three groups of young males in the laboratory: one with recordings, one with live adult tutors and one with no song (isolate bi...
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Patch-burn grazing is a management framework designed to promote heterogeneity in grasslands, creating more diverse grassland structure to accommodate the habitat requirements of many grassland species, particularly grassland birds. Published studies on the effects of patch-burn grazing on passerines have been conducted on relatively large (430–980 ha pastures), contiguous grasslands, and only ...
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ژورنال
عنوان ژورنال: The Auk
سال: 1902
ISSN: 0004-8038,1938-4254
DOI: 10.2307/4069035