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Gonzalez, A; Guerra, A; Pascual, S; Segonzac, Michel. |
During biological sampling of hydrothermal vents on the East Pacific Rise, the manned submersible 'Nautile' caught the first female of the endemic cephalopod Vulcanoctopus hydrothermalis. The specimen caught at the vent site Gromit (21 degrees 33 66'S, 114 degrees 17 98'W at 2832 m depth) is described here in detail and an amended diagnosis of the species proposed. The external morphology, measurements and internal structure resemble that Of males of this species. One of the most remarkable characters is the lack of spermathecae and the absence of apical filaments in the oocytes to provide a site for sperm storage. It is suggested that some species of the genera Benthoctopus and Bathypolypus would be the most suitable octopod ancestor of V. hydrothermalis. |
Tipo: Text |
Palavras-chave: Female description; Vulcanoctopus hydrothermalis; Cephalopods; Hydrothermal vent. |
Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4044.pdf |
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Pierce, G; Santos, M; Murphy, S; Learmonth, J; Zuur, A; Rogan, E; Bustamante, Paco; Caurant, Florence; Lahaye, V; Ridoux, Vincent; Zegers, B; Mets, A; Addink, M; Smeenk, C; Jauniaux, T; Law, R; Dabin, W; Lopez, A; Farre, J; Gonzalez, A; Guerra, A; Garcia Hartmann, M; Reid, R; Moffat, C; Lockyer, C; Boon, J. |
Concentrations of polychlorinated biphenyls (PCBs) in blubber of female common dolphins and harbour porpoises from the Atlantic coast of Europe were frequently above the threshold at which effects on reproduction could be expected, in 40% and 47% of cases respectively. This rose to 74% for porpoises from the Southern North Sea. PCB concentrations were also high in southern North Sea fish. The average pregnancy rate recorded in porpoises (42%) in the study area was lower than in the western Atlantic but that in common dolphins (25%) was similar to that of the western Atlantic population. Porpoises that died from disease or parasitic infection had higher concentrations of persistent organic pollutants (POPs) than animals dying from other causes. Few of the... |
Tipo: Text |
Palavras-chave: Diet; Reproduction; Persistent organic pollutants; Delphinus delphis; Phocoena phocoena. |
Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-7314.pdf |
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