Further evidence for apostatic selection by wild passerine birds—9:1 experiments
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چکیده
منابع مشابه
Experimental evidence for adaptive personalities in a wild passerine bird.
Individuals of the same species differ consistently in risky actions. Such 'animal personality' variation is intriguing because behavioural flexibility is often assumed to be the norm. Recent theory predicts that between-individual differences in propensity to take risks should evolve if individuals differ in future fitness expectations: individuals with high long-term fitness expectations (i.e...
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در این تحقیق به مطالعه وجود انتخاب نامساعد(کژ گزینی) در بازار بیمه درمان تکمیلی ایران پرداخته شده است. داده های مورد نیاز توسط پرسشنامه و به روش نمونه گیری خوشه ای جمع آوری شده است. پرسشنامه ها در میان افراد شاغل ساکن شهر تهران توریع شد. در این تحقیق با استفاده از تخمین دو مدل لجستیک و به دست آوردن ضریب همبستگی میان تقاضای بیمه درمان تکمیلی و رخداد خسارت به بررسی موضوع مورد نظر پرداخته شده است....
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Theories regarding the role of sexual selection on the evolution of sperm traits are based on an association between pre-copulatory (e.g. female preference) and post-copulatory (e.g. ejaculate quality) male reproductive traits. In tests of these hypotheses, sperm morphology has rarely been used, despite its high heritability and intra-individual consistency. We found evidence of selection for l...
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Because female reproductive success in social mammals is determined largely by parental rather than mating effort, intra-sexual competition among females has typically been assumed to occur primarily over food. Recently, however, renewed attention has been paid to the importance of other sources of variation in female fitness, with a concomitant focus on a broader definition of intra-sexual sel...
متن کاملMultilevel Selection and Neighbourhood Effects from Individual to Metapopulation in a Wild Passerine
Multilevel selection has rarely been studied in the ecological context of animal populations, in which neighbourhood effects range from competition among territorial neighbours to source-sink effects among local populations. By studying a Dupont's lark Chersophilus duponti metapopulation, we analyze neighbourhood effects mediated by song repertoires on fitness components at the individual level...
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ژورنال
عنوان ژورنال: Heredity
سال: 1976
ISSN: 0018-067X,1365-2540
DOI: 10.1038/hdy.1976.21