Increases in local richness (α-diversity) following invasion are offset by biotic homogenization in a biodiversity hotspot
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The world's ecosystems are experiencing unparalleled rates of biodiversity change, with invasive species implicated as one of the drivers that restructure local assemblages. Here we focus on the processes leading to biodiversity change in a biodiversity hotspot, the Brazilian Cerrado. The null expectation that invasion leads to increase in local species richness is supported by our investigation of the grass layer in two key habitats (campo sujo and campo úmido). Our analysis uncovered a linear relationship between total richness and invasive richness at the plot level. However, because the invasive species—even though few in number—are widespread, their contribution to local richness (α-diversity) is offset by their homogenizing influence on composition (β-diversity). We thus identify a mechanism that can help explain the paradox that species richness is not declining in many local assemblages, yet compositional change is exceeding the predictions of ecological theory. As such, our results emphasize the importance of quantifying both α-diversity and β-diversity in assessments of biodiversity change in the contemporary world.
Kortz , A R & Magurran , A E 2019 , ' Increases in local richness (α-diversity) following invasion are offset by biotic homogenization in a biodiversity hotspot ' , Biology Letters , vol. 15 , no. 5 , 20190133 . https://doi.org/10.1098/rsbl.2019.0133
Copyright © 2019 The Author(s). This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1098/rsbl.2019.0133
DescriptionThis work was funded by the Brazilian Ciência sem Fronteiras/Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) (grant number 1091/13-1), European Research Council (AdG BioTIME (grant number 250189) and PoC BioCHANGE (grant number 727440)) and the Royal Society.
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