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Body-size shifts in aquatic and terrestrial urban communities.

Abstract：

:Body size is intrinsically linked to metabolic rate and life-history traits, and is a crucial determinant of food webs and community dynamics1,2. The increased temperatures associated with the urban-heat-island effect result in increased metabolic costs and are expected to drive shifts to smaller body sizes 3 . Urban environments are, however, also characterized by substantial habitat fragmentation 4 , which favours mobile species. Here, using a replicated, spatially nested sampling design across ten animal taxonomic groups, we show that urban communities generally consist of smaller species. In addition, although we show urban warming for three habitat types and associated reduced community-weighted mean body sizes for four taxa, three taxa display a shift to larger species along the urbanization gradients. Our results show that the general trend towards smaller-sized species is overruled by filtering for larger species when there is positive covariation between size and dispersal, a process that can mitigate the low connectivity of ecological resources in urban settings 5 . We thus demonstrate that the urban-heat-island effect and urban habitat fragmentation are associated with contrasting community-level shifts in body size that critically depend on the association between body size and dispersal. Because body size determines the structure and dynamics of ecological networks 1 , such shifts may affect urban ecosystem function.

journal_name

Nature

journal_title

Nature

authors

Merckx T,Souffreau C,Kaiser A,Baardsen LF,Backeljau T,Bonte D,Brans KI,Cours M,Dahirel M,Debortoli N,De Wolf K,Engelen JMT,Fontaneto D,Gianuca AT,Govaert L,Hendrickx F,Higuti J,Lens L,Martens K,Matheve H,Matthysen

doi

10.1038/s41586-018-0140-0

subject

Has Abstract

pub_date

2018-06-01 00:00:00

pages

113-116

issue

7708

eissn

0028-0836

issn

1476-4687

pii

10.1038/s41586-018-0140-0

journal_volume

558

pub_type

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