气候变化领域集成服务门户(CCPortal): Seasonal nest use of sympatric North American flying squirrels

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DOI	10.1071/WR23041
	Seasonal nest use of sympatric North American flying squirrels
发表日期	2024
ISSN	1035-3712
EISSN	1448-5494
起始页码	51
结束页码	2
卷号	51 期号:2
英文摘要	Context Nest or roost sites are important for social thermoregulators - not only because the locations provide shelter from harsh climates, but also because they provide sites for social aggregations. Nest use can therefore be informative about selection pressures facing social thermoregulators.Aims The aim of this study was to assess seasonal changes in nest use of sympatric northern (Glaucomys sabrinus) and southern (Glaucomys volans) flying squirrels. Local sympatry at our study site allowed us to evaluate nest use by individuals of both species subject to similar nest availability. We hypothesised that southern flying squirrels should be more selective than northern flying squirrels, especially in winter due to lower cold tolerance by the southern species.Methods We used radio telemetry to track 57 squirrels during 2019-2022 at a site in central Ontario, Canada. Each squirrel was tracked during the day to their nest site, and tree characteristics - including diameter at breast height, tree species, nest type and decay class - were recorded.Key results Northern flying squirrels used both coniferous and deciduous trees, as well as a mix of cavities, dreys and subterranean nests. Southern flying squirrels nested most often in deciduous tree cavities and used dreys less frequently than northern flying squirrels. The only significant effects in regression models, however, were effects of tree diameter. Both species used large-diameter trees in the winter and summer, and these effects were larger in the winter months. In both seasons, southern flying squirrels used larger trees than northern flying squirrels.Conclusions Our study results were consistent with the hypothesis that nest selection is associated with temperature and squirrel aggregation size. Both northern and southern flying squirrels used large trees during summer and winter months, as would be an expected requirement for aggregation; however, this effect was amplified in southern flying squirrels and in the winter.Implications Cold ambient temperature is an underlying factor in winter months, creating the need for social thermoregulation and increased squirrel aggregation sizes, especially in the small-bodied southern flying squirrel. This in turn leads to a need for large-diameter cavity trees for nest groups to occupy during winter. In North America, climate change and habitat loss are leading to increased interspecific contact between northern and southern flying squirrels. Both species use tree cavities for denning, and we assessed the seasonal selection of these nest trees by the two flying squirrel species at a site where they both occur. We found that both species used larger trees in winter than in summer, and that southern flying squirrels used larger trees than did northern flying squirrels. Photo by Jacob Bowman.
英文关键词	cavity; cavity nest; den; flying squirrel; Glaucomys; roost; social thermoregulation; tree; winter
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Zoology
WOS类目	Ecology ; Zoology
WOS记录号	WOS:001184458000004
来源期刊	WILDLIFE RESEARCH
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/306201
作者单位	Trent University; Trent University; University of Manitoba; University of Toronto; University Toronto Scarborough; Ministry of Natural Resources & Forestry
推荐引用方式 GB/T 7714	. Seasonal nest use of sympatric North American flying squirrels[J],2024,51(2).
APA	(2024).Seasonal nest use of sympatric North American flying squirrels.WILDLIFE RESEARCH,51(2).
MLA	"Seasonal nest use of sympatric North American flying squirrels".WILDLIFE RESEARCH 51.2(2024).

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