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The costs of mischoosing are not uniform across individuals


Matching habitat choice is a particular form of habitat selection based on self?assessment of local performance that offers individuals a means to optimize the match of phenotype to the environment. Despite the advantages of this mechanism in terms of increased local adaptation, examples from natural populations are extremely rare. One possible reason for the apparent rarity of matching habitat choice is that it might be manifest only in those segments of a population for which the cost of a phenotype–environment mismatch is high. To test this hypothesis, we used a breeding population of sockeye salmon (Oncorhynchus nerka) exposed to size-dependent predation risk by bears, and evaluated the costs of mischoosing in discrete groups (e.g. male versus females, and ocean?age 2 versus ocean?age 3) using reproductive life span as a measure of individual performance. Bear preference for larger fish, especially in shallow water, translates into a performance trade-off that sockeye salmon can potentially use to guide their settlement decisions. Consistent with matching habitat choice, we found that salmon of similar ocean?age and size tended to cluster together in sites of similar water depth. However, matching habitat choice was only favoured in 3?ocean females – the segment of the population most vulnerable to bear predation. This study illustrates the unequal relevance of matching habitat choice to different segments of a population, and suggests that ‘partial matching habitat choice' could have resulted in an underestimation of the actual prevalence of this mechanism in nature. informacion[at] Camacho & Hendry (2020) Matching habitat choice: it's not for everyone. Oikos DOI 10.1111/oik.06932
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Different responses to climate change in resident and migratory birds

Different responses to climate change in resident and migratory birds

The adjustment to climate change and the differential effects of temperature on resident and migratory birds were studied using the start dates of the laying in ten long-term studies in nest-boxes in Europe with data on at least one species of resident tit ??and one species of migratory flycatcher. Resident tit populations advanced their breeding more strongly in relation to temperature increases than migratory flycatchers. The divergence was strongest in the lower latitudes where the interval between tits and flycatchers is smaller and winter conditions are more favourable for residents. The phenological adjustment of flycatchers to climate change seems to be progressively further hampered by competition with resident species. The differential effect of climate change on groups of species with superimposed reproductive ecology affects the phenological interval between them, impinging on interspecific interactions. informacion[at] Samplonius et al. (2018) Phenological sensitivity to climate change is higher in resident than in migrant bird populations among European cavity breeders; Global Change Biol