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Latitudinal patterns of species diversity on South American rocky shores: local processes lead to contrasting trends in regional and local species diversity

Cruz-Motta, JJ, Miloslavich, P, Guerra-Castro, E, Hernandez-Agreda, A, Herrera, C, Barros, F, Navarrete, SA, Sepulveda, RD, Glasby, TM, Bigatti, G, Cardenas-Calle, M, Carneiro, PBM, Carranza, A, Flores, AAV, Gil-Kodaka, P, Gobin, J, Gutierrez, JL, Klein, E, Krull, M, Lazarus, JF, Londono-Cruz, E, Lotufo, T, Macaya, EC, Mora, C, Mora, E, Palomo, G, Parrague, M, Pellizzari, F, Retamales, R, Rocha, RM and Romero, L 2020 , 'Latitudinal patterns of species diversity on South American rocky shores: local processes lead to contrasting trends in regional and local species diversity' , Journal of Biogeography, vol. 47, no. 9 , pp. 1966-1979 , doi: 10.1111/jbi.13869.

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Aim We evaluated whether patterns of species diversity (α, β and γ) of rocky shore assemblages followed latitudinal gradients (i.e. LDGs) along the South American coasts, and tested hypotheses related to potential processes sustaining or disrupting the expected LDG pattern at various spatial scales. Location Coasts of South America. Taxon Macroalgae and sessile/slow‐moving macrofauna on intertidal rocky shores. Methods We evaluated changes in species composition across 143 sites. The degree of replacement and loss of species at different spatial scales (i.e. coasts, regions and sites) were estimated to help distinguish among ecological, historical and evolutionary hypotheses for explaining LDGs. Furthermore, components of diversity and taxonomic distinctness were measured, and variability in these measures was decomposed using analysis of covariance. Finally, we examined relationships between diversity and a suite of environmental and anthropogenic variables to identify potential mechanisms that may be responsible for the reported spatial relationships. Results Species composition varied with latitude, and this variability was relatively consistent on both coasts. At all spatial scales, replacement of species was the dominant phenomenon (>95%), rather than loss in the total number of species ( Main conclusions Species diversity of South American rocky shores followed, with interruptions, LDGs. The trend of those LDGs, however, depended on the scale and metric used to describe diversity. It is proposed that patterns of LDGs at various scales are not the result of a single overarching process but are strongly influenced by local and regional pro cesses. Although the most evident environmental gradient was the decrease in SST towards the south, it was demonstrated that regional and local environmental variables were also important for understanding the increase in regional β‐diversity towards the tropics.

Item Type: Article
Authors/Creators:Cruz-Motta, JJ and Miloslavich, P and Guerra-Castro, E and Hernandez-Agreda, A and Herrera, C and Barros, F and Navarrete, SA and Sepulveda, RD and Glasby, TM and Bigatti, G and Cardenas-Calle, M and Carneiro, PBM and Carranza, A and Flores, AAV and Gil-Kodaka, P and Gobin, J and Gutierrez, JL and Klein, E and Krull, M and Lazarus, JF and Londono-Cruz, E and Lotufo, T and Macaya, EC and Mora, C and Mora, E and Palomo, G and Parrague, M and Pellizzari, F and Retamales, R and Rocha, RM and Romero, L
Keywords: intertidal rocky shores, latitudinal diversity gradient, macroecology, Southeast Pacific, Southern Caribbean, Southwestern Atlantic, spatial scales, species diversity
Journal or Publication Title: Journal of Biogeography
Publisher: Blackwell Publishing Ltd
ISSN: 0305-0270
DOI / ID Number: 10.1111/jbi.13869
Copyright Information:

Copyright 2020 John Wiley & Sons Ltd

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