By Les D. Beletsky, David F. Gori, Scott Freeman, John C. Wingfield (auth.), Dennis M. Power (eds.)
In Volume 12, eminent overseas ornithologists additional elucidate endocrinological correlates of mating techniques and hormones and reproductive habit; check the price of the ''brood aid hypothesis'' in explaining ''the paradox of hatching asynchrony''; and discover the validity and sensitivity of development bands in feathers as a sign of dietary and using feather banding in learning development. Chapters are good supported with charts, maps, schematic diagrams, and images. Current Ornithology is the one English-language book presently dedicated completely to wide reports and synthesis of subject matters bearing on all features of the biology of birds. Chapters fall lower than such different rubrics as ecology, evolution, habit, phylogeny, behavioral ecology, anatomy and body structure, and conservation biology. All authors are top specialists on their topics, and every bankruptcy is refereed through specialists within the issues coated. even supposing all chapters concentration totally on birds, a few subject matters, equivalent to the social cognition of birds in comparison to primates (Volume 13), have major software to disciplines outdoor of ornithology. Current Ornithology goals to supply an obtainable, up to date, exact resource of knowledge and to give a contribution to conceptual generalization and unification around the organic sciences.
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26:420-432. Best, 1. , and Rodenhouse, N. , 1984, Territory preference of Vesper Sparrows in cropland, Wilson Bull. 96:72-82. , and Wingfield, J. , 1991, Hormonal correlates of bower decoration and sexual display in the Satin Bowerbird (Ptilonorhynchos violaceus), Condor 93:935-942. , 1992, Immediate and long-term effects on male aggression from testosterone implants in juvenile male Satin Bowerbirds, Auk 109:422-434. Crook, J. , 1964, The evolution of social organization and visual communication in the weaverbirds (Ploceinae), Behav.
Males of species which usually breed polygynously may be inherently less sensitive endocrinologically to immediate social interactions, with respect to T secretion, because their breeding systems favor continual high T levels. 10. Results of a field experiment in which male Red-winged Blackbirds were given T implants to increase their circulating T levels supported the hypothesis that there are costs associated with maintaining high plasma T levels. Males given high T levels suffered more wounding than did controls, suggesting that they engaged in more fighting with conspecifics.
We artificially raised circulating T levels in territory owners and then assessed whether experimental males lost weight more rapidly, behaved more aggressively, or were wounded more often than controls. , Washington. Between 8 and 15 April, we trapped all 24 males with territories on the two marshes. 96 mm) adjacent to the left pectoralis muscle; (2) provided with colored legbands for individual identification; (3) weighed and released. Experimental males (n = 12), with contiguous territories that were spatially separated from the control males' territories, were given implants packed with crystalline testosterone; control males (n = 12) received empty implants.