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Available Climate Regimes Drive Niche Diversification during Range Expansion

Artikel i vetenskaplig tidskrift
Författare R. O. Wuest
Alexandre Antonelli
N. E. Zimmermann
H. P. Linder
Publicerad i American Naturalist
Volym 185
Nummer/häfte 5
Sidor 640-652
ISSN 0003-0147
Publiceringsår 2015
Publicerad vid Institutionen för biologi och miljövetenskap
Sidor 640-652
Språk en
Länkar dx.doi.org/10.1086/680551
Ämnesord biogeography, continents, niche evolution, opportunistic evolution, grasses (Poaceae), truncated, PHYLOGENETIC SIGNAL, CONSERVATION BIOLOGY, DANTHONIOID GRASSES, ADAPTIVE, EVOLUTION, ECOLOGY, SHIFT, BIOGEOGRAPHY, GRADIENTS, INVASION, INSIGHTS, Ecology, Evolutionary Biology
Ämneskategorier Geovetenskap och miljövetenskap

Sammanfattning

Climate is a main predictor of biodiversity on a global scale, yet how climate availability affects niche evolution remains poorly explored. Here we assess how intercontinental climate differences may affect the evolution of climate niches and suggest three possible processes: niche truncation along major environmental gradients, intercontinental differences in available climate causing differences in selective regimes, and niche shifts associated with long-distance dispersals leading to a pattern of punctuated evolution. Using the globally distributed danthonioid grasses, we show significant niche differentiation among continents and several instances of niche truncation. The comparison of inferred selective regimes with differences in available climatic space among continents demonstrates adaptation resulting from opportunistic evolution toward available climatic space. Our results suggest that niche evolution in this clade is punctuated, consistent with accelerated niche evolution after long-distance dispersal events. Finally, we discuss how intrinsic constraints (genetic, developmental, or functional) and biotic interactions could have interacted with these three processes during range expansion. Integrating these mechanisms could improve predictions for invasive taxa and long-term evolutionary responses of expanding clades to climate change.

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