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• W4281722517 startingPage "1679" @default.
• W4281722517 abstract "Abstract Niche variation at population level mediates niche packing (i.e. patterns of species' spread within the niche space) and species coexistence at community level. Competition and ecological opportunity (resource diversity) are two of the main mechanisms underlying niche variation. Dense niche packing could occur through increased niche partitioning or increased niche overlap. In this study, we used stable carbon and nitrogen isotope data of 635 individual rodents from four species across nine sites in the montane region of a subtropical island to test the effects of competition and ecological opportunity on population isotope niche size, inter‐individual niche difference within population and interspecific niche overlap within community. We used the Bayesian Standard Ellipse Area (SEAB, the ellipse area enclosed by carbon and nitrogen isotope values of organisms on a bi‐plot) to estimate population niche size and interspecific niche overlap. Inter‐individual niche difference within population was quantified as isotopic divergence and isotopic uniqueness. We used rodent abundance (the number of unique individuals captured) to measure competition and plant isotope niche size (plant SEAB) to measure ecological opportunity. The rodents experienced competition as evidenced by a negative relationship between population change rate and conspecific abundance. Rodent population niche size increased with ecological opportunity but not competition. The inter‐individual niche difference (isotopic uniqueness) increased with competition (interspecific competition only) but not ecological opportunity. At community level, interspecific niche overlap (herbivore–omnivore pair only) increased with competition (the combined abundance of the pair) but not ecological opportunity. This study demonstrated that isotope niche variation of the rodents could be hierarchically influenced by ecological opportunity and competition, with the former setting the limit of population niche size across communities and the latter shaping inter‐individual niche difference and interspecific niche overlap within communities. Under strong intraspecific competition and limited ecological opportunity for niche expansion, individuals may choose to increase their isotopic uniqueness from conspecifics at the cost of overlapping with heterospecifics of different trophic roles within the community niche space as overall competition increases. Denser niche packing of these rodent communities might be achieved through increased niche overlap." @default.
• W4281722517 created "2022-06-13" @default.
• W4281722517 creator A5036370770 @default.
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• W4281722517 date "2022-06-07" @default.
• W4281722517 modified "2023-09-26" @default.
• W4281722517 title "Niche overlap in rodents increases with competition but not ecological opportunity: A role of inter‐individual difference" @default.
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• W4281722517 doi "https://doi.org/10.1111/1365-2656.13750" @default.
• W4281722517 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35633185" @default.
• W4281722517 hasPublicationYear "2022" @default.
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