Browsing by Author "Gallardo, Victor"
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Item Analysis of Antarctic Conservation Areas with Emphasis on Marine Areas(1987) Gallardo, VictorPresent conservation areas within the Antarctic Treaty System (ATS) are analyzed by numerical classification. Emphasis is placed on the problem of generating marine conservation areas. The classification is based on 12 objective variables for both the Specially Protected Areas (SPAs) and the Sites of Special Scientific Interest (SSSIs). Jaccard's qualitative index of similarity and the unweighted arithmetic average clustering are applied. Results reveal important inconsistencies in the system of generating conservation areas in the Antarctic, particularly as regards areas with marine components. Corrections are suggested.Item Taxonomic Composition of the Sublittoral Soft - Bottom Polychaeta of Chile Bay (Greenwich Island, South Shetland Islands, Antarctica)(1988) Gallardo, Victor; Medrano, Sonia; Carrasco, FranklinThe taxonomic composition of the sublittoral soft-bottom polychaetes of Chile (Discovery) Bay collected in the summer (1967-1968) by the XXII Chilean Antarctic Expedition is studied. Samples were obtained from depths of 33-355 m with a Petersen 0.1 m2 bottom grab and the biological material steved through a 1 mm2 mesh sieve. Polychaetes were as far as possible specifically identified or separated into different forms (DFs). The analysis of 40 quantitative samples collected in 39 benthic stations revealed 206 species or DFs. distributed into 26 families in a total of 13.307 individuals. The Polychaeta Errantia comprised 11 families. 71 species and DFs, and a total of 535 individuals while the Sedentaria contained 15 families, 135 species and DFs, and a total of 12.772 individuals. The most abundant and widely distributed families were Maldanidae and Cirratulidae, while the most species rich were Terebellidae, Spionidae and Phyllodocidae. Oweniidae was only important in terms of abundance due to a singIe patch of Owenia sp. (St. 56 with 5.440 individuals). The most abundant species were Maldane sarsi antarctica Arwidson, 1911 and Tharyx cinccinnatus Ehlers, 1908. The maximum number of families, species and DFs, and individuals of polychaetes per 0.1 m2 sample were, 18, 43 and 5.440 respectively. In general the study discloses the existence in Chile Bay of a highly diversified and complex polychaete infauna dominated by deposit - feeders. Results are discussed with reference to data available in the literature from Arthur Harbor and Almiralty Bay. It is concluded that the polychaete assemblages of this part of Antarctica exhibit a similar taxonomic composition.