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    Distribution, Abundance, and Size Composition of Echinoids from Basin Slopes off Southern California

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    Subject
    Distribution; Abundance; Size Composition; Echinoids; Basin Slopes; Southern California
    Author
    Thompson, Bruce E.; Jones, Gilbert F.; Laughlin, Jimmy D.; Tsukada, David T.
    Journal Title
    Scas: Bulletin of the Southern California Academy of Sciences
    Volume
    86
    Issue
    scas/vol86/iss3; 3
    Metadata
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    URI
    https://scholar.oxy.edu/handle/20.500.12711/9239
    Abstract
    Distribution, abundance, and size composition of echinoids from basin slopes off southern California by Bruce E. Thompson, Gilbert F. Jones, Jimmy D. Laughlin, and David T. Tsukada, Bull. Southern California Acad. Sci. 86 #3. Four echinoid species are commonly collected from the basin slopes off southern California, and often are the dominant (abundance and biomass) megabenthic species. Allocentrotus fragilis is collected in low densities on the upper slopes (150-480 m) of all basins studied. Brissopsis pacifica inhabits all slope areas of the region and is most abundant mid-slope (300-600 m). It increases in abundance from the northern to southern nearshore basin slopes. Brisaster latifrons is most abundant on upper slopes of the northern nearshore basins and in contrast to B. pacifica, it decreases in abundance to the south. Spatangus californicus is only a minor component of upper slope assemblages. Although all four echinoid species co-occur on the slopes, there are differences in their abundances among the basin slopes and over slope depth.
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