Rapid morphological change in a small mammal species after habitat fragmentation over the past half?century

نویسندگان

چکیده

Aim To compare the rapid shifts in body size of mainland and island populations a native rodent examine mechanisms underlying these changes. Location Thousand Island Lake, China, which was created 1959 when Xin'anjiang Dam constructed for generating hydroelectricity. Taxon The Chinese white-bellied rat, Niviventer confucianus. Methods Field surveys were conducted from 2015 to 2018 collect data on rodents set islands nearby sites. We multiple linear models relationships between (length mass) biological variables (predators, competitors food availability). also structural equation modelling (SEM) by constructing via confirmatory path analysis. Results All N. confucianus had significantly larger (both mass length) than their counterparts. Moreover, small more isolated relatives big islands. relative absence predators (large-bodied mammals, snakes raptors) most strongly associated with rodents. documented changes occurred after only half-century fragmentation. Main conclusions observed enlargement habitat fragmentation is consistent release predation pressure. SEM indicated that area, rather isolation, positive effects abundance predators, interspecific resources, then an indirect impact In this study, we report remarkably case mammal morphological response Given omnipresence dams other anthropogenic disturbances, our findings suggest wave phenotypic terrestrial vertebrates taking place Anthropocene.

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ژورنال

عنوان ژورنال: Diversity and Distributions

سال: 2021

ISSN: ['1472-4642', '1366-9516']

DOI: https://doi.org/10.1111/ddi.13437