RT Journal Article T1 Spatio-temporal distribution and ecological preferences of coexisting hydropsychid species (Trichoptera) in two Mediterranean river basins (S Spain) A1 Prenda Marín, José A1 Toja Santillana, Julia A1 Gallardo Mayenco, Alfonso AB The hydropsychids of two Mediterranean river basins in southern Spain (Guadaira and Guadalete) were investigated from January 1988 to January 1989. The distribution of hydropsychids along an environmental gradient related to altitude varied depending on species. Two distinct species assemblages were observed, one located in the lower altitude sites (the "downstream assemblage" comprising Hydropsyche pictetorum, Hydropsyche exocellata and Cheumatopsyche lepida) and the other in the upper-most areas (the "upstream assemblage" comprising Hydropsyche punica, Hydropsyche infernalis, Hydropsyche instabilis), which displayed a statistically significant preference for this type of habitat. Finally, H. pictetorum, selected the lowest sites. From a temporal point of view most species displayed a high variability in density dynamics between sites, suggesting a strong plasticity in life-cycle phenology. SN 1434-2944 YR 1998 FD 1998 LK http://hdl.handle.net/10272/4179 UL http://hdl.handle.net/10272/4179 LA eng NO GALLARDO-MAYENCO, A., PRENDA MARÍN, J., TOJA SANTILLANA, J.: “Spatio-temporal distribution and ecological preferences of coexisting hydropsychid species (Trichoptera) intwo Mediterranean river basins (S Spain)”. International Review of Hydrobiology, vol. 83, n. 2, 1998, pp. 123–134.WILEY-V C H VERLAG GMBH. ISSN 1434-2944. DS Repositorio Institucional de la Universidad de Huelva RD 28 may 2026