Geographic variation in diversity of wave exposed rocky intertidal communities along central Chile

Bernardo R. Broitman, Fredy VéLiz, Tatiana Manzur, Evie A. Wieters, G. Randall Finke, Paulina A. Fornes, Nelson Valdivia, Sergio A. Navarrete

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Along the coast of central Chile, geographic trends of diversity have been inferred from literature compilations and museum collections based on species range limits for some taxonomic groups. However, spatially-intensive fieldbased assessments of macrobenthic species richness are largely missing. Over the course of a multiyear study (1998-2005), we characterized latitudinal patterns of rocky intertidal diversity at 18 sites along the coast of central Chile (29-36° S). At each site, the number of sessile and mobile macrobenthic species was quantified in 0.25 m 2 quadrats. Two estimators of local (alpha) diversity were used: observed local species richness, calculated from the asymptote of a species-rarefaction curve, and the Chao2 index, which takes into account the effect of rare species on estimates of local richness. We identified a total of 71 species belonging to 66 genera for a total of 86 taxa. The most diverse groups were herbivorous mollusks (27 taxa) and macroalgae (43 taxa). Diversity showed a complex spatial pattern with areas of high species richness interspersed with areas of low richness. In accordance with previous work, we found no trend in the number of herbivorous mollusks and an inverse and significant latitudinal gradient in the number of algal species. Our results highlight the need for taxonomically diverse assessments of biodiversity of the dominant taxa that conform intertidal communities.

Original languageEnglish
Pages (from-to)143-154
Number of pages12
JournalRevista Chilena de Historia Natural
Volume84
Issue number1
DOIs
StatePublished - Mar 2011

Keywords

  • Biological diversity
  • Intertidal ecology
  • Latitudinal diversity gradient
  • Species richness

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