Species Composition of Rocky Intertidal and Subtidal Fish Assemblages in Central and Northern California, British Columbia-Southeast Alaska
Yoshiyama, Ronald M.
Lea, Robert N.
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We summarized data on species abundances for subtidal and shoreline fish assemblages from two areas in California and from the Alexander Archipelago in northern British Columbia-southeast Alaska. For the northern California and British Columbia-Alaska areas, the combined shoreline and subtidal collections were dominated numerically by cottids and stichaeids. At the central California survey area, scorpaenids were the predominant group, followed by cottids, stichaeids, pholids, and bothids. Within each region, individual species tended to occur either mostly in the intertidal/shoreline zone or mostly subtidally; rarely were species abundant in both habitats. Because intertidal species are largely confined to that habitat, populations at widely separated locations could be demographically and genetically isolated, unless gene flow (immigration) via planktonic larval dispersal occurs.