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Macroinvertebrate community structure in an intermittent and a permanent Mediterranean streams (NE Spain)

Benthic invertebrate communities of two undisturbed Mediterranean streams were compared with respect to seasonal variation in richness, density, biomass, size and functional feeding groups. Seasonal variability of temperature and discharge differed among these streams and constituted a source of disturbance to the community. La Solana stream is characterised by a summer dry period, floods in winter and spring and a high range of water temperature, whereas Riera Major is a permanent stream and floods are uncommon thoughout the year. Richness and biomass were lower in La Solana than in Riera Major. Larvae of Hydropsyche gr. pellucidula and Ecdyonurus insignis Eaton from La Solana were smaller than from Riera Major. Cluster analysis revealed a different seasonal distribution of the biomass of different functional feeding groups that suggests variations in their food-web structure. Autumn communities of the two streams were the most distinctive due to a high total biomass in La Solana and a high shredder biomass in Riera Major. Marked seasonality appeared to be important determinant of invertebrate community structure.