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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
environmental science
The origins and diversification of C
4
grasses and savanna-adapted ungulates
Global Change Biology, Volume 15, No. 10, Year 2009
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Description
C4 grasses constitute the main component of savannas and are pervasive in other dry tropical ecosystems where they serve as the main diet for grazing animals. Among potential factors driving C4 evolution of grasses, the interaction between grasses and grazers has not been investigated. To evaluate if increased grazing pressure may have selected for higher leaf silica production as the grasses diverged, we reconstructed the phylogeny of all 800 genera of the grass family with both molecular (combined multiplastid DNA regions) and morphological characters. Using molecular clocks, we also calculated the age and number of origins of C4 clades and found that shifts from C3 to C4 photosynthesis occurred at least 12 times starting 30.9 million years ago and found evidence that the most severe drop in atmospheric carbon dioxide in the late Oligocene (between 33 and 30 million years ago) matches the first origin of C4 photosynthesis in Chloridoideae. By combining fossil and phylogenetic data for ungulates and implementing a randomization procedure, our results showed that the appearance of C4 grass clades and ungulate adaptations to C4-dominated habitats match significantly in time. An increase of leaf epidermal density of silica bodies was found to correspond to postulated shifts in diversification rates in the late Miocene [24 significant shifts in diversification (P<0.05) were detected between 23 and 3.7 million years ago]. For aristidoid and chloridoid grasses, increased grazing pressure may have selected for a higher leaf epidermal silica production in the late Miocene. © 2009 Blackwell Publishing Ltd.
Authors & Co-Authors
Bouchenak-Khelladi, Yanis
Ireland, Dublin
Trinity College Dublin
South Africa, Cape Town
University of Cape Town
Verboom, George Anthony
South Africa, Cape Town
University of Cape Town
Hodkinson, Trevor Roland
Ireland, Dublin
Trinity College Dublin
Salamin, Nicolas
Switzerland, Lausanne
Université de Lausanne Unil
François, Olivier
France, La Tronche
Techniques for Biomedical Engineering and Complexity Management Informatics, Mathematics and Applications Grenoble Timc-imag
Ní Chonghaile, Grainne
Ireland, Dublin
Trinity College Dublin
Savolainen, Vincent
United Kingdom, Richmond
Royal Botanic Gardens, Kew
United Kingdom, London
Imperial College London
Statistics
Citations: 112
Authors: 7
Affiliations: 6
Identifiers
Doi:
10.1111/j.1365-2486.2009.01860.x
ISSN:
13541013
e-ISSN:
13652486
Research Areas
Environmental
Genetics And Genomics
Study Design
Randomised Control Trial