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Bimodality of latitudinal gradients in marine species richness
Chaudhary, C.; Saeedi, H.; Costello, M.J. (2016). Bimodality of latitudinal gradients in marine species richness. Trends Ecol. Evol. 31(9): 670-676. https://dx.doi.org/10.1016/j.tree.2016.06.001
In: Trends in Ecology and Evolution. Elsevier Science: Amsterdam. ISSN 0169-5347; e-ISSN 1872-8383
Peer reviewed article  
Available in  Authors 
Keywords
    Biodiversity
    Climate change
    Geographical coordinates > Latitude
    Geography > Biogeography
    Habitat
    Properties > Physical properties > Thermodynamic properties > Temperature
    Marine/Coastal
Authors  Top 
  • Chaudhary, C.
  • Saeedi, H.
  • Costello, M.J., more
Abstract
    The paradigm for the latitudinal gradient in species richness is that it is unimodal with a tropical peak. For 27 published studies, and global datasets of 65 000 recent and 50 000 fossil marine species, we found that almost all datasets were significantly bimodal with a dip in species richness near the equator. The locations of mid-latitude peaks varied between taxa and were higher in the northern hemisphere where the continental shelf is greatest. Our findings support hypotheses of tropical species evolving in response to temperature variation near the edges of the tropics and available high-productivity habitat. They suggest that the equator may already be too hot for some species and that the modes may move further apart due to climate warming.
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