Geographic variation in social behaviour of white-browed sparrow-weavers,Plocepasser mahali
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چکیده
منابع مشابه
Geographic Variation in Wing-loading of the House Sparrow
Intraspecific variation in size of widely distributed birds often agrees with modern interpretation of Bergmann’ s Rule; that is, size is correlated with a combination of climatic variables that includes temperature and/or moisture (James 1968, 1970, Power 1969). N or th ern races of birds are frequently larger (Mayr 1963:320), but the adaptive significance of increased size has been widely deb...
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Intradialect variation in the song of 138 male Nuttall’s White-crowned Sparrows (Zonotrichia Zeucophrys nuttalli) was examined using multivariate cluster analyses on both quantitative (frequency and temporal) and qualitative (structural) variables. Mapping of song groups revealed local song clusters with a high degree of spatial overlap and the occurrence of “satellite” males located well outsi...
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Environments vary across space and time, and behavioural divergence among populations is commonplace. Differences in behaviour may represent genetic divergence or phenotypic plasticity, and arise from abiotic or biotic factors. In turn, such differences in behaviour may promote reproductive isolation and speciation, and they may also influence how traits such as mating displays relate to fitnes...
متن کاملEcology shapes birdsong evolution: variation in morphology and habitat explains variation in white-crowned sparrow song.
Ecological variation appears to underlie the evolution of mating signals in many taxa, yet understanding of how this process occurs over time is limited. Here, I investigate whether changes over time in a well-studied mating signal-birdsong-are attributable to ecological factors that affect signal production and transmission. Variation in the acoustic properties of songs is thought to be affect...
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ژورنال
عنوان ژورنال: South African Journal of Zoology
سال: 1988
ISSN: 0254-1858
DOI: 10.1080/02541858.1988.11448069