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  • 1
    Publication Date: 2008-07-11
    Description: In their investigation into whether female mate-choice drives male dispersal, Honer et al. argue that female spotted hyaenas (Crocuta crocuta) prefer mates whose tenure in the social group is less than the females' age, to avoid paternal incest, and suggest that male dispersal reflects this preference. However, we are not persuaded that females choose mates on the basis of tenure because Honer et al. overlook the alternative hypothesis that dispersal status itself is important in female mate-choice, such that females prefer immigrants over natal males. Like mate-choice based on tenure, choice based on dispersal status reduces the risk of incest.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Van Horn, Russell C -- Watts, Heather E -- Holekamp, Kay E -- England -- Nature. 2008 Jul 10;454(7201):E1; discussion E2. doi: 10.1038/nature07122.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Zoological Society of San Diego, Conservation and Research for Endangered Species, P.O. Box 120551, San Diego, California 92112-0551, USA. rvanhorn@sandiegozoo.org〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18615020" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Female ; Hyaenidae/*physiology ; Inbreeding ; Male ; Mating Preference, Animal/*physiology ; Reproducibility of Results ; Social Behavior ; Time Factors
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2018-08-09
    Description: The transition to a migratory state involves coordinated changes in physiology and behaviour. In species with regular, predictable (obligate) migrations, increasing day length triggers the expression of a spring migratory state and androgens play an important role in stimulating its development. By contrast, we know little about the environmental cues and endocrine mechanisms that regulate migration in species with less predictable (facultative) migrations. Here, we tested whether photoperiod stimulates a migratory state in a facultative nomadic migrant, the pine siskin ( Spinus pinus ). We exposed wintering birds to either a naturally increasing or short-day photoperiod and measured physiological and behavioural changes indicative of a migratory state. We also examined changes in circulating hormones that may play a role in the migratory transition. Natural-day, but not short-day, birds displayed physiological preparations for migration, including increases in fat deposition, and showed increased levels of migratory restlessness. We found no evidence for a role of corticosterone in the migratory transition, but testosterone may be important. This study is the first experimental test of the role of photoperiod in regulating facultative migration and demonstrates that the predictive cue used by many obligate migrants to time spring migration is also important in a facultative migrant.
    Keywords: behaviour, physiology
    Electronic ISSN: 2054-5703
    Topics: Natural Sciences in General
    Published by Royal Society
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