Structure of and relationships within and between the littoral, rock-substrate fish communities off four islands in the Canarian Archipelago

摘要: A total of 577 visual surveys (each 5 min in duration and 100 m2 area) were conducted throughout 1990 1991 at 32 locations off four Canary islands (i.e., Alegranza, Fuerteventura, Gran Canaria Tenerife) with the objects describing coastal fish community, comparing differences fauna within between these islands, determining biotic abiotic factors related to structure communities. 76 species recorded; most common Abudefduf luridus, Canthigaster rostrata, Chromis limbatus, Sparisoma cretense Thalassoma pavo (94.28, 86.48, 52.34, 73.31, 94.10% frequency occurrence, respectively). The abundance average size commercially important was greater those where there less fishing pressure. stepwise linear regression models capable explaining only a low amount variation dependent variables number species, individuals, diversity) community. independent recorded date, time day, depth, slope substrate, substrate type, percentage sand, algae, algal height, sea urchins (Diadema antillarum) individual islands. An ANOVA, using as variables, indicated that each island contributed significantly significant among Detrended correspondence analysis (DCA) two-way indicator (TWINSPAN) determined associations environmental attributes survey locations. patterns TWINSPAN localities had faunal resemblances based on which they located.