Substrate utilisation in a Mediterranean littoral fish community
Marine Ecology Progress Series
Substratum use and spatial relationships in a littoral fish assemblage (families Blenniidae, Tripterygiidae and Gobiidae) were studied along the coast of northeastern Spain. All the species considered displayed a clear preference for a specific substratum type, and that preference was unrelated to substratum availability in the environment. Both the number of species and species density were distinctly higher for blennies and threefin blennies at depths of less than 1 m. Larger numbers of
... er numbers of species and higher density levels were observed in areas where rock and blocks were abundant as opposed to areas in which sand, gravel, or Posidonia oceanica beds predominated. The gobiids, in contrast, did not exhibit any clear tendency over the depth range considered. The results on the disjunct distributions, changes in niche breadth values for sympatric and allopatric distributions of species pairs, and variations in niche breadth and overlap with species richness appear to suggest that substratum occupancy by most species has no adverse effect on the other species present.