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      Species and functional diversity accumulate differently in mammals : The dynamics of global mammalian diversity

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          Evolution and the latitudinal diversity gradient: speciation, extinction and biogeography.

          A latitudinal gradient in biodiversity has existed since before the time of the dinosaurs, yet how and why this gradient arose remains unresolved. Here we review two major hypotheses for the origin of the latitudinal diversity gradient. The time and area hypothesis holds that tropical climates are older and historically larger, allowing more opportunity for diversification. This hypothesis is supported by observations that temperate taxa are often younger than, and nested within, tropical taxa, and that diversity is positively correlated with the age and area of geographical regions. The diversification rate hypothesis holds that tropical regions diversify faster due to higher rates of speciation (caused by increased opportunities for the evolution of reproductive isolation, or faster molecular evolution, or the increased importance of biotic interactions), or due to lower extinction rates. There is phylogenetic evidence for higher rates of diversification in tropical clades, and palaeontological data demonstrate higher rates of origination for tropical taxa, but mixed evidence for latitudinal differences in extinction rates. Studies of latitudinal variation in incipient speciation also suggest faster speciation in the tropics. Distinguishing the roles of history, speciation and extinction in the origin of the latitudinal gradient represents a major challenge to future research.
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            A distance-based framework for measuring functional diversity from multiple traits

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              PanTHERIA: a species-level database of life history, ecology, and geography of extant and recently extinct mammals

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                Author and article information

                Journal
                Global Ecology and Biogeography
                Global Ecology and Biogeography
                Wiley-Blackwell
                1466822X
                September 2016
                September 2016
                : 25
                : 9
                : 1119-1130
                Article
                10.1111/geb.12471
                © 2016
                Product
                Self URI (article page): http://doi.wiley.com/10.1111/geb.12471

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