caa a22 4500 445894083 CHVBK 20180317145626.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s10750-011-0821-2 doi (NATIONALLICENCE)springer-10.1007/s10750-011-0821-2 Pérez-Quintero Juan Departamento de Biología Ambiental y Salud Pública, Universidad de Huelva, Campus Universitario de El Carmen, Facultad de Ciencias Experimentales, Avda. Tres de Marzo s/n, 21071, Huelva, Spain aut Distribution patterns of freshwater molluscs along environmental gradients in the southern Guadiana River basin (SW Iberian Peninsula) [Elektronische Daten] [Juan Pérez-Quintero] The taxonomic status of the freshwater mollusc fauna of the Iberian Peninsula it is reasonably well known, but, unlike other benthic macroinvertebrate, its distribution and ecology has been poorly studied. In this article, I study the relationships between environmental characteristics and distribution and community structure of freshwater molluscs along climatic, hydrological, physicochemical, and heterogeneity gradients in the southwestern Iberian Peninsula. Ninety-four sampling points were analysed, in which, in addition to habitat features, the presence/absence and abundance of species were evaluated. The environmental gradients were measured by use of principal-components analysis (PAC), which orders the variables along two gradients: headwaters-mouth gradient (PC1) and water availability (PC2). According to canonical correspondence analysis (CCA), the main environmental factors related to species distribution and community structure were conductivity, permanency, channel width, turbidity, slope, and distance to the main river axis. The relationship between biodiversity (measured as species richness and the Shannon-Weiner diversity index), the ratio of the number of introduced species to the total number of species (zoogeographic integrity coefficient), and environmental variables was best explained by a regression model incorporating, basically, the permanence of water in streams as the variable that accounted for most of the variance. This study demonstrates that the distribution of freshwater molluscs along a Mediterranean gradient highly stressed by drought depends, mainly, on the hydrological stability and environmental conditions of the headwaters and estuarine sites. Springer Science+Business Media B.V., 2011 Biodiversity of freshwater molluscs nationallicence Distribution of freshwater molluscs nationallicence Guadiana River nationallicence Habitat fragmentation nationallicence Iberian Peninsula nationallicence Introduced species nationallicence Mediterranean rivers nationallicence Reservoirs nationallicence Hydrobiologia Springer Netherlands 678/1(2011-12-01), 65-76 0018-8158 678:1<65 2011 678 10750 https://doi.org/10.1007/s10750-011-0821-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-011-0821-2 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Pérez-Quintero Juan Departamento de Biología Ambiental y Salud Pública, Universidad de Huelva, Campus Universitario de El Carmen, Facultad de Ciencias Experimentales, Avda. Tres de Marzo s/n, 21071, Huelva, Spain aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 678/1(2011-12-01), 65-76 0018-8158 678:1<65 2011 678 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer