Browsing by Author "CARRASCO, FD"

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    SOME CHARACTERISTICS OF MACROBENTHIC FAUNA FROM THE ORGANIC-ENRICHED SEDIMENTS AT TALCAHUANO, CHILE
    (1987) OYARZUN, C; CARRASCO, FD; GALLARDO, VA
    The community structure of the macrobenthic (> 500 .mu.m) fauna from organic matter enriched-soft bottom of Talcahuano Port, Concepcion Bay, Chile, was studied and compared over other two sites located further away with progressively less organic content. Polychaeta was the main taxon reaching 93.7% of the whole analyzed fauna. The numerical abundances were high (from 26.280 ind. m-2 to 63.830 ind. m-2), while the number of species was low (44 species). The species diversity values calculated for the fauna were low, and the same pattern for the evenness was observed. The Talcahuano port benthic station (C1) was dominated by the great numbers of the small opportunistic spinoid polychaete Carraziella carrascoi. The nearby station C2 showed high numbers of the small polychaete Cossura chilensis and oligochaetes. The more distant site from Talcahuano port (station C3) was dominated by individuals of C. carrascoi and Owenia collaris. The stations (C1 and C2) more associated with Talcahuano port facilities, where the organic matter was important, exhibited the highest number of individuals and the lowest amount of species, which was reflected in low species diversity figures and the low slopes of the rarefaction curves. The macrobenthic fauna of station C1 (Talcahuano port) and C2, conformed a different faunal assemblage with respect to station C3, as was showed by the numerical classification. The log-normal distribution analysis of individuals among species showed a faunal transition phase to organic pollution for the two more Talcahuano port associated benthic stations.