منابع مشابه
Bust economics: foragers choose high quality habitats in lean times
In environments where food resources are spatially variable and temporarily impoverished, consumers that encounter habitat patches with different food density should focus their foraging initially where food density is highest before they move to patches where food density is lower. Increasing missed opportunity costs should drive individuals progressively to patches with lower food density as ...
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Resource selection is grounded in the understanding that animals select resources based on fitness requirements. Despite uncertainty in how mechanisms relate to the landscape, resource selection studies often assume, but rarely demonstrate, a relationship between modeled variables and fitness mechanisms. Using Canada lynx (Lynx canadensis) and snowshoe hare (Lepus americanus) as a model system,...
متن کاملSexual selection favours male parental care, when females can choose.
Explaining the evolution of male care has proved difficult. Recent theory predicts that female promiscuity and sexual selection on males inherently disfavour male care. In sharp contrast to these expectations, male-only care is often found in species with high extra-pair paternity and striking variation in mating success, where current theory predicts female-only care. Using a model that examin...
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We show that the provision of social information influences a high-stakes decision and this influence persists over time. In a field experiment involving thousands of admits to Teach For America, those told about the previous year’s matriculation rate are more likely to accept a teaching job, complete training, start, and return a second year. To show robustness, we develop a simple theory that...
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Information on schools’ performance is central to the school choice process in England. This paper evaluates school performance tables against criteria of functionality, relevance, and comprehensibility. We estimate a model to judge functionality by setting up the following question: “In which feasible school will my child achieve the highest exam score?” We show that neither of the current lea...
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ژورنال
عنوان ژورنال: Nature
سال: 1980
ISSN: 0028-0836,1476-4687
DOI: 10.1038/286757a0