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      Análisis espacial de las comunidades tropicales intermareales asociadas a los litorales rocosos de Venezuela Translated title: Spatial analysis of intertidal tropical assemblages associated with rocky shores in Venezuela

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          Abstract

          Se presenta una descripción cuantitativa de las comunidades intermareales asociadas a los litorales rocosos de Venezuela, la cual consideró las siguientes escalas espaciales jerárquicamente organizadas: regiones (separadas por cientos de kilómetros), localidades dentro de cada región (separadas por decenas de kilómetros), sitios dentro de las localidades (separadas por cientos de metros) y réplicas (separadas por metros). Se encontró que las comunidades de algas variaron significativamente a todas las escalas espaciales consideradas, mientras que los animales variaron significativamente sólo a las escalas espaciales de sitios y localidades pero no a la escala de regiones. Para las dos matrices de datos (algas y animales), los componentes de variación mayores estuvieron asociados a las escalas de localidades y réplicas, y los menores con la escala de regiones. Los resultados de este estudio tienen relevancia para el entendimiento de las comunidades asociadas a litorales rocosos tropicales ya que se mostró que, como ocurre en zonas templadas, la mayor fuente de variabilidad se encuentra a escalas espaciales pequeñas (metros y cientos de metros) y que las comparaciones a escalas espaciales más grandes pueden estar confundidas o solapadas por esta variabilidad. Asimismo, permiten la propuesta de modelos conceptuales sobre procesos ecológicos que pueden ser relevantes para estos sistemas.

          Translated abstract

          A quantitative description is made of the intertidal assemblages associated with rocky shores on the coast of Venezuela, considering different hierarchically-structured spatial scales: regions (separated by hundreds of kilometers), locations within regions (separated by tens of kilometers), sites within locations (separated by tens to hundreds of meters) and replicate quadrates (separated by meters). Assemblages of algae varied significantly at all the spatial scales, whereas assemblages of animals varied significantly only at the spatial scales of sites and locations but not at the scale of regions. For the two data matrices (algae and animals), the largest components of variation were found among locations and among replicates, and the smallest were associated with the spatial scale of regions. Findings in this study have relevance for an improved understanding of tropical rocky assemblages because it was shown that, as occurs in other temperate zones, variability at small spatial scales (meters and hundreds of meters) is very important and, consequently, comparisons among places located at larger distances might be confounded by this variability. Moreover, they allow the proposal of conceptual models about ecological processes that might be relevant for these systems.

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          Most cited references 89

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                Author and article information

                Affiliations
                [1 ] Universidad Simón Bolívar Venezuela
                Contributors
                Role: ND
                Journal
                ciemar
                Ciencias marinas
                Cienc. mar
                Universidad Autónoma de Baja California, Instituto de Investigaciones Oceanológicas (Ensenada )
                0185-3880
                2007
                : 33
                : 2
                : 133-148
                S0185-38802007000200003

                http://creativecommons.org/licenses/by/4.0/

                Product
                Product Information: SciELO Mexico
                Categories
                Marine & Freshwater Biology

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