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| Natura: | Artículo científico |
| Lingua: | en |
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Universidad de Costa Rica
2008
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| Accesso online: | https://www.redalyc.org/articulo.oa?id=44919934009 |
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Sommario:
- Vertical zonation of rocky intertidal organisms in a seasonal upwelling area (Eastern Tropical Pacific) Jeffrey Alejandro Sibaja-Cordero Jorge Cortés Biología PCA PCA MDA MDA Tropical The intertidal rocky shore of Bahía Salinas (seasonal upwelling area), northern Pacific coast ofCosta Rica, was studied to determine the vertical zonation of algae and invertebrates. In two sheltered and two exposed sites the communities were sampled twice, once during the upwelling (April) and again during the nonupwelling season (October). At each site five strata were sampled with 25x25cm quadrats. Each stratum had five quadrats and digital photographs of each quadrat were taken. Digital image analysis was used to estimate the percent cover of sessile species and abundance of mobile fauna. A typical vertical zonation was found usingPrincipal Component Analysis (PCA) biplot and Multiple Discriminant Analysis (MDA). The analysis of similarities (ANOSIM) detected a seasonal change in the biological composition of the inferior strata. This change in the percent cover of the algal assemblage and their herbivores were related to the seasonal upwelling. Sessile invertebrates had a constant percent cover between April and October, but the difference between exposed andsheltered sites was significant. Invertebrates showed a patchy structure in sheltered sites while in exposed sites organisms formed horizontal bands. Interactions between species indicated that predation and space monopolization were possible causes of lower cover of barnacles in sheltered sites and lower abundance of mollusks in the exposed area. Regional difference of intensity in the upwelling event and larval recruitment may explain the high cover of sessile invertebrates of Bahía Salinas in comparison to the Bay of Panama, another seasonal upwelling system. 2008 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44919934009 en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.4 Vol.56