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Global gradients in intertidal species richness and functional groups
Thyrring, J.; Peck, L.S. (2021). Global gradients in intertidal species richness and functional groups. eLIFE 10: e64541. https://dx.doi.org/10.7554/elife.64541
In: eLIFE. eLife Sciences Publications: Cambridge. ISSN 2050-084X, more
Peer reviewed article  

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Keyword
    Marine/Coastal

Authors  Top 
  • Thyrring, J.
  • Peck, L.S.

Abstract
    Whether global latitudinal diversity gradients exist in rocky intertidal α-diversity and across functional groups remains unknown. Using literature data from 433 intertidal sites, we investigated α-diversity patterns across 155° of latitude, and whether local-scale or global-scale structuring processes control α-diversity. We, furthermore, investigated how the relative composition of functional groups changes with latitude. α-Diversity differed among hemispheres with a mid-latitudinal peak in the north, and a non-significant unimodal pattern in the south, but there was no support for a tropical-to-polar decrease in α-diversity. Although global-scale drivers had no discernible effect, the local-scale drivers significantly affected α-diversity, and our results reveal that latitudinal diversity gradients are outweighed by local processes. In contrast to α-diversity patterns, species richness of three functional groups (predators, grazers, and suspension feeders) declined with latitude, coinciding with an inverse gradient in algae. Polar and tropical intertidal data were sparse, and more sampling is required to improve knowledge of marine biodiversity.

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