Antarctic scallop (Adamussium colbecki) spatial population variability along the Victoria Land Coast, Antarctica |
| |
Authors: | Mariachiara Chiantore Riccardo Cattaneo-Vietti Paul Arthur Berkman Marco Nigro Marino Vacchi Stefano Schiaparelli Giancarlo Albertelli |
| |
Institution: | (1) DIP.TE.RIS Dipartimento per lo Studio del Territorio e delle sue Risorse, Università di Genova, Viale Benedetto XV, 5-16132 Genoa, Italy e-mail: chiantore@dipteris.unige.it Tel.: +39-10-3538329, Fax: +39-10-3538102, IT;(2) Byrd Polar Research Center, The Ohio State University, 108 Scott Hall, 1090 Carmack Road, Columbus, OH 43210, USA, US;(3) Dipartimento di Morfologia Umana e Biologia Applicata, Sez. di Biologia e Genetica, Università di Pisa, Via A. Volta, 4-56100 Pisa, Italy, IT;(4) ICRAM, Istituto Centrale per la Ricerca Scientifica e Tecnologica Applicata al Mare, Via di Casalotti, 300-00166 Rome, Italy, IT |
| |
Abstract: | Along the Victoria Land Coast, the population structure of the Antarctic scallop (Adamussium colbecki) was studied in McMurdo Sound (New Harbor), Terra Nova Bay, and Wood Bay, on a latitudinal span of 3 degrees. At a large
spatial scale, most relevant differences between the scallop populations are linked to their depth distributions. The McMurdo
and Wood Bay populations show a shallower bathymetric distribution with maximum abundance between 5 and 15 m depth. In contrast,
inside Terra Nova Bay, at sites with similar near-shore bathymetric profiles, the maximum biomass is found between 40 and
70 m. This difference can be related to the different ice-cover persistency characterising these two areas, being less at
Terra Nova Bay than in the other localities. Differences arise also in the reproductive period: at McMurdo, it seems to occur
early in the austral spring, while at Terra Nova Bay, mature females are observed at the beginning of February. Also at a
small scale, in sites only a few miles from each other, the population structures inside Terra Nova Bay and Wood Bay vary
in terms of abundance and size frequency distribution, suggesting various environmental and biological constraints. Among
environmental factors, bottom features (slope, sediment grain size, organic content) and water-column food supply during the
summer months may be considered. In addition, as Adamussium is preyed upon by starfishes and fishes, its abundance and population structure may be affected by predators and their abundance.
Accepted: 7 August 2000 |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|