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dc.contributor.authorRufino, Marta M.-
dc.contributor.authorGaspar, Miguel B.-
dc.contributor.authorMaynou, Francesc-
dc.contributor.authorMonteiro, Carlos C.-
dc.identifier.citationEstuarine, Coastal and Shelf Science 80(4): 517–528 (2008)en_US
dc.description12 pages, 8 figures.-- Printed version published Dec 10, 2008.en_US
dc.description.abstractFrom 2000 to 2006, a total of 75 bivalve species were identified, varying from 29 (spring 2001) to 54 species (spring 2005) per year. Seasonal tendencies in diversity varied according the year, thus the interpretation of long-term and regional scales is essential before drawing any conclusions in other studies. Richness and diversity consistently decreased with depth and increased with sediment grain size (from low in very coarse sand to high in coarse silt). Diversity decreased progressively from 3 to 16 m depth, thus the harsher shallower environments (due to waves and tidal air exposure) showed greater diversity than the most stable areas. Communities in finer sediments were more diverse than those in coarser sand. Evenness showed patterns opposite to diversity, overall.en_US
dc.description.abstractDiversity and evenness maps (produced with multivariate universal kriging), showed that most geographic areas with greater diversity were farer from river outflows and wastewater treatment plants. Two types of geographic pattern were observed: areas with persistently greater bivalve diversity through time and areas that changed locally from year to year. This spatial analysis can be used to establish priority conservation areas for management purposes, and to analyse the persistency of regional diversity patterns. The area with most habitat heterogeneity (Sotavento) corresponded to greatest diversity.-
dc.description.abstractThere was a positive relationship between Spisula solida and Chamelea gallina landings and bivalve diversity 2 years and 1 year later, respectively. Possibly, local fisheries, by selectively withdrawing the commercial numerically dominant species from the ecosystem, increased diversity 1 to 2 years later, as the ecological niches of the dominants are quickly filled by several other species thereby creating a more even community. On regional scales, no significant impact was found on long-term bivalve diversity in local fisheries.-
dc.description.sponsorshipThis work was part of an MMR Post-doc program financed by Fundação para a Ciência e a Tecnologia BPD /14935/ 2004.en_US
dc.format.extent24064 bytes-
dc.subjectMultivariate analysisen_US
dc.subjectGeographical distributionen_US
dc.subjectTime series analysisen_US
dc.subjectLongitude -9 to -7.5ºWen_US
dc.subjectLatitude ~37ºNen_US
dc.titleRegional and temporal changes in bivalve diversity off the south coast of Portugalen_US
dc.description.peerreviewedPeer revieweden_US
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