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Revista de biología marina y oceanografía

versión On-line ISSN 0718-1957

Resumen

ACUNA, Emilio O  y  JARAMILLO, Eduardo. Sandy beach macroinfauna from the coast of northern Chile affected by different anthropic pressures. Rev. biol. mar. oceanogr. [online]. 2015, vol.50, n.2, pp.299-313. ISSN 0718-1957.  http://dx.doi.org/10.4067/S0718-19572015000300008.

Urban sandy beaches are affected by artificial grooming and recreational activities that result in disturbances of sediments and macroinfauna. During October 2012, 3 urban and 4 non-urban beaches were sampled along the coast of northern Chile (ca., 20-21°S), in order to evaluate their intertidal macroinfauna community structure. Four transects set - perpendicular to the shoreline - were replicated from the upper intertidal to the low tide level to collect sediment samples and macroinfauna on the upper, middle and lower beach. The amount of debris stranded across the shore was used as an estimation of beach grooming. Urban beaches with grooming (i.e., almost no debris) had lower species richness than non-urban beaches without grooming and thus with stranded debris (4-5 vs. 8-9 spp., respectively). The crab Ocypode gaudichaudii was absent in 2 urban beaches where artificial grooming is used; on the other hand, even when they are present in an urban beach with artificial grooming (Huayquique) the burrow´s diameter of this crab were the lowest at that site. No significant differences were found in the population abundances of the other 2 common species occurring in urban and non-urban beaches: the isopod Excirolana braziliensis and the anomuran Emerita analoga. Thus, it is concluded that artificial grooming affects primarily to an upper shore species, the crab O. gaudichaudii, which is a conspicuous member of the faunal communities in sandy beaches of northern Chile.

Palabras clave : Sandy beaches; northern Chile; anthropic disturbance.

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