Rarity and beta diversity assessment as tools for guiding conservation strategies in marine tropical subtidal communities

Diversity and Distributions - Tập 25 Số 5 - Trang 743-757 - 2019
Lélis Antonio Carlos-Júnior1,2, Matthew Spencer2, Danilo M. Neves3,4, Timothy P. Moulton1, Débora de Oliveira Pires5, Clovis B. Castro5, Carlos Renato Rezende Ventura5, Carlos E. L. Ferreira6, Cristiana S. Serejo5, Simone Siag Oigman‐Pszczol7, Fernanda Araújo Casares1,7, Marcelo Checoli Mantelatto1, Joel C. Creed1
1Departamento de Ecologia, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
2School of Environmental Sciences, University of Liverpool, Liverpool, UK
3Department of Botany, Federal University of Minas Gerais, Belo Horizonte, Brazil
4Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, Arizona.
5Museu Nacional, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
6Departamento de Biologia Marinha, Universidade Federal Fluminense, Niterói, Brazil
7Instituto Brasileiro de Biodiversidade, Rio de Janeiro, Brazil

Tóm tắt

AbstractAimOur aim was to uncover patterns of distribution of marine subtidal rocky reef communities across six taxonomic groups and decompose the relative roles of species loss and turnover in total community variation. Additionally, we propose an easily calculated index that can be used to highlight areas with unique species composition for conservation planning. We estimated the strengths of associations between environmental factors and species richness and rarity.LocationIlha Grande Bay, Brazil, covering about 150,000 ha harbouring different marine habitats.MethodsWe used the Marine Rapid Assessment Protocol at 42 sites to gather information on environmental variables and species in six subtidal marine groups. We determined “singular” sites as the regions harbouring higher numbers of rare species. Then, we estimated the roles of species loss and turnover on the observed total variation among sites. We used Generalized Linear Model to partition the relative importance of the selected environmental factors in driving variation in species richness and singularity.ResultsThe singularity index and richness showed that the bay could be divided into three subregions for subtidal communities. Richness and rarity were structured at different spatial scales and associated with environmental variables related to water productivity and nutrients but varied among taxonomic groups. Community variation over space was largely associated with turnover of species.Main conclusionsHigher singularity and richness on the western side of the bay and around the main island suggested that these regions should be conservation priorities, but high species turnover across the whole bay indicated that portions of the central channel should be included in conservation strategies. This draws attention to the importance of community variation rather than just species numbers in conservation and management planning. The high species turnover indicated that these rocky reefs have high beta diversity when compared to other studied biological systems.

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Diversity and Distributions

Tập 25 Số 5

743-757

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