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Investigaciones marinas

versión On-line ISSN 0717-7178


RAMIREZ, María Eliana  y  OSORIO, Cecilia. Distributional patterns of the intertidal macroalgae and macroinvertebrates from  Robinson Crusoe island, Juan Fernandez archipelago, Chile. Investig. mar. [online]. 2000, vol.28, pp. 1-13. ISSN 0717-7178.

The present work describe in qualitative and quantitative terms the distributional patterns of the marine organisms from a rocky shores in the "El Palillo" beach at Robinson Crusoe Islands Archipelago Juan Fernandez, in base to a new exploration in the field and also in base to a coberture percentage of the organisms over a transect of 11.6 m. The following distributional patterns was observed. In the upper intertidal zone the small mollusk Nodilittorina fernandezensis is present with a coberture of 14 and 17%. In the middle intertidal zone (1 to 2 m) the dominants species are Chaaetomorpha firma (62%), Ulva rigida (36%) and Gelidium pseudointricatum (16%). Between the invertebrates at this tidal level we found Jehlius cirratus (10%) and Heliaster canopus ( 21%) only at 1 m. In the low intertidal the algae Corallina officinalis (27%), Chondracanthus intermedius (20%) and G. pseudointricatum (12 to 13%) are the dominants species. Below this level the species Ulva rigida (23%) and Sphacelaria cirrosa (20%) are the dominants. These patterns are different to those described for others near communities of the continent. Physical and biogeographicals factors can be determinants in the species composition and the structure of these communities

Palabras clave : distribution; macroalgae; macroinvertebrates; rocky intertidal habitat; Juan Fernandez archipelago; Chile.

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