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Personality differences in the selection of dynamic refugia have demographic consequences for a winter-adapted bird.

ABSTRACT: For overwintering species, individuals' ability to find refugia from inclement weather and predators probably confers strong fitness benefits. How animals use their environment can be mediated by their personality (e.g. risk-taking), but does personality mediate how overwintering species select refugia? Snow cover is a dynamic winter characteristic that can influence crypsis or provide below-the-snow refugia. We explored how wintering ruffed grouse (Bonasa umbellus) selected snow roosting sites, a behaviour that reduces stress and cold exposure. We linked selection for approximately 700 roosts with survival of 42 grouse, and showed that grouse generally selected deeper snow and warmer areas. Grouse found in shallow snow were less likely to survive winter. However, individuals that selected deep snow improved their survival, suggesting that demographic consequences of selecting winter refugia are mediated by differences in personality. Our study provides a crucial, and seldom addressed, link between personality in resource selection and resulting demographic consequences.

SUBMITTER: Shipley AA

PROVIDER: S-EPMC7542783 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature

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Personality differences in the selection of dynamic refugia have demographic consequences for a winter-adapted bird.

Shipley Amy A AA Cruz Jennyffer J Zuckerberg Benjamin B

Proceedings. Biological sciences 20200909 1934

For overwintering species, individuals' ability to find refugia from inclement weather and predators probably confers strong fitness benefits. How animals use their environment can be mediated by their personality (e.g. risk-taking), but does personality mediate how overwintering species select refugia? Snow cover is a dynamic winter characteristic that can influence crypsis or provide below-the-snow refugia. We explored how wintering ruffed grouse (<i>Bonasa umbellus</i>) selected snow roosting ...[more]

PMID: 32900309

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Project description:IntroductionThere is a growing drive to improve the heterogeneity of medical school cohorts. However, those from lower socio-economic groups remain under-represented. Understanding the methods used by applicants to prepare for medical school selection, and the challenges they face with respect to opportunities and access, may provide important insights to this lack of diversity. This research considered the influence of socio-demographic background on preparation for medical school selection and on the successful offer of a place.MethodsAll eligible applicants to a large UK medical school were invited to complete an anonymous online survey (international and mature applicants excluded), detailing demographic data and experiences of preparing for selection and challenges faced (n = 1885). Selection outcomes across all UK medical schools were examined for consenting students (n = 955). Univariate and multivariate analyses explored the associations of preparatory activities and demographic data with subsequent offer of a place at a UK medical school.ResultsThe survey response rate was 66.4%. Clinical work experience (hospital or general practice), fee-based courses for admissions tests and school preparation courses for interview were activities significantly associated with the offer of a place (P < .05). Those attending independent (private) schools most frequently reported school support and fee-based courses to support preparation (P < .01). Applicants from state non-selective (SNS) schools and lower socio-economic groups more frequently reported challenges in accessing fee-based support, school interview courses and clinical work experience (P ≤ .02).DiscussionClinical work experience, commercial courses for admissions tests and school-based support for interview represent areas of preparation that are associated with success. However, they also represent areas that are more challenging to access for demographic groups traditionally under-represented in medicine. Addressing complex issues of fairness in highly selective higher education settings can appear an insurmountable task. These preparatory activities represent key areas for applicants, schools and institutions to explore and address.

Project description:BackgroundSeasonal changes in resource availability are known to influence the migratory behaviour of animals, including both timing and distance. While the influence of environmental cues on migratory behaviour has been widely studied at the population level, it has rarely been examined at the spatial scale at which individuals experience their environment. Here, we test the hypothesis that individuals exposed to similar large-scale environmental cues may vary in migratory behaviour in response to the different microclimate conditions they experience at fine scales.MethodsWe combine high-spatial and temporal resolution microclimate and habitat information with GPS tracking data for a partially migratory threatened grassland bird. Data from 47 little bustards (Tetrax tetrax; 67 breeding events) tracked between 2009 and 2019 was used to (i) evaluate individual consistency in migratory behaviour (timing and distance) and (ii) assess whether the local environmental characteristics experienced by individuals - and in particular their use of microclimate refugia - influence distance and timing of migration, from and to the breeding sites.ResultsMigratory distance was consistent for birds tracked over multiple years, while the timing of migration showed high variability among individuals. Departures from breeding areas spanned from May to August, with a few birds remaining in their breeding areas. Vegetation greenness (a proxy for food availability) was positively associated with the time birds spent in the breeding area. The best model also included a positive effect of microclimate refugia availability on breeding season length, although an interaction with temperature suggested that this effect did not occur at the highest relative temperatures. The return date to breeding grounds, although spanning from September to April, was not influenced by the environmental conditions or food availability.ConclusionsFood availability, measured by a vegetation greenness proxy, was associated with later migration at the end of the breeding season. Availability of cooler microclimate refugia may also allow for later departures from the breeding sites in all but the hottest conditions. Management measures that increase microclimate refugia availability and provide foraging resources can thus potentially increase the length of the breeding season for this species.

Dataset Information

Personality differences in the selection of dynamic refugia have demographic consequences for a winter-adapted bird.

Publications

Personality differences in the selection of dynamic refugia have demographic consequences for a winter-adapted bird.

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