Abstract
The objectives of the present study are to describe and compare the brachyuran community of rocky shores within the Central Portuguese coast and to examine the zonation patterns of the most representative species. For this, randornly placed transects were surveyed to obtain crab counts according to microhabitat and intertidal level. Repeated sampling in two different shores during two different seasons provided spatial and temporal replication for zonation analyses. Seven species were registered: Pachygrapsus marmoratus, Eriphia verrucosa, Xantho incisus, Carcinus maenas, Necora puber, Pirimela denticulata and Pilumnus hirtellus. Species density rankings are the same at both localities, but the less exposed shore presents higher diversity. While most species are mainly confined to specific microhabitats in the lower level, P. marmoratus and E. verrucosa can exploit the whole intertidal range. Regardless of shore and season, E. verrucosa is more abundant in the lower intertidal levels, while no such zonation patterns were recorded for P. marmoratus. Initial predictions concerning the effect of wave exposure and temperature on the zonation of those species are not validated after analysing the factorial model proposed. Between-shore contrasts were found instead, with higher densities recorded in the more exposed locality for both species. Possible causes of the observed patterns are discussed.
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© 2001 Springer Science+Business Media Dordrecht
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Flores, A.A.V., Paula, J. (2001). Intertidal distribution and species composition of brachyuran crabs at two rocky shores in Central Portugal. In: Paula, J.P.M., Flores, A.A.V., Fransen, C.H.J.M. (eds) Advances in Decapod Crustacean Research. Developments in Hydrobiology, vol 154. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0645-2_18
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DOI: https://doi.org/10.1007/978-94-017-0645-2_18
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