The distribution and abundance of gymnosome gas-tropods in the Argentine Sea and Brazil—Malvinas ... more The distribution and abundance of gymnosome gas-tropods in the Argentine Sea and Brazil—Malvinas Confluence during 1978-1979 and 1988 were studied. The collections analyzed included 768 quantitative samples obtained between 48°W and the coast, and from 35°S to 55°S. Two species were found. Spongio-branchaea australis was the most frequent and abundant (up to 730 per 1000 m3); its presence in the area was associated with the core of the Malvinas Current. Clione antarctica was less abundant (maxi-mum abundance: 230 per 1000 m3) and was also associated with the Malvinas Current. The geo-graphic ranges of both species in the area are wider than previously described. Since the range of 5. australis in the area extends far from the range of its prey Clio, it is not clear whether S. australis can feed on the thecosomatous pteropod Limacina (and not only on Clio, as described in the bibliography) or it starves in that area. During the 1978-1979 annual cycle, the abundance of both species fo...
The distribution and abundance of gymnosome gas-tropods in the Argentine Sea and Brazil—Malvinas ... more The distribution and abundance of gymnosome gas-tropods in the Argentine Sea and Brazil—Malvinas Confluence during 1978-1979 and 1988 were studied. The collections analyzed included 768 quantitative samples obtained between 48°W and the coast, and from 35°S to 55°S. Two species were found. Spongio-branchaea australis was the most frequent and abundant (up to 730 per 1000 m3); its presence in the area was associated with the core of the Malvinas Current. Clione antarctica was less abundant (maxi-mum abundance: 230 per 1000 m3) and was also associated with the Malvinas Current. The geo-graphic ranges of both species in the area are wider than previously described. Since the range of 5. australis in the area extends far from the range of its prey Clio, it is not clear whether S. australis can feed on the thecosomatous pteropod Limacina (and not only on Clio, as described in the bibliography) or it starves in that area. During the 1978-1979 annual cycle, the abundance of both species fo...
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Papers by Silvina Chauvin