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Climate change and temporal trends in body size: the case of rodents
Author(s) -
Villar Carlos H.,
Naya Daniel E.
Publication year - 2018
Publication title -
oikos
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.672
H-Index - 179
eISSN - 1600-0706
pISSN - 0030-1299
DOI - 10.1111/oik.04884
Subject(s) - torpor , context (archaeology) , climate change , rodent , biology , ecology , range (aeronautics) , basal metabolic rate , bergmann's rule , allometry , phenology , zoology , geography , thermoregulation , paleontology , biochemistry , materials science , geodesy , composite material , latitude
A reduction in body size has been proposed as the third universal ecological response to global warming, after species distributional shifts and phenological changes. However, some recent studies raise doubts about the validity of this pattern, in particular for endotherms. Within this context, here we analyzed data on body mass (m b ) for 17 rodent species, covering (at least) the last six decades, together with data on temperature change and basal metabolic rate (BMR) for each species. We found that: 1) ten species (58.8%) showed no significant changes in m b , while the remaining seven species (41.2%) decreased their size during the 20th century; 2) phylogenetic generalized linear mixed models indicate that there is a significant and negative effect of the year of collection on m b ; 3) the correlation coefficient between m b and the year of collection (r year ) was not correlated with species mean m b , species distributional range, the length of the time series, or the change in ambient temperature; and 4) the correlation between r year and (residual) BMR was significant (and negative) only for species that do not use torpor. In summary, our results suggest that reductions in m b are common among rodents, but we were unable to identify a clear cause behind these changes (e.g. some results support the energetic argument behind the Bergmann's rule but other do not). We concluded that with less than 0.5% of the extant (known) rodent species analyzed to date, we still are far from reaching a clear understanding of current patterns of variation in body size that are associated with global environmental change for this group.