期刊
JOURNAL OF THE MARINE BIOLOGICAL ASSOCIATION OF THE UNITED KINGDOM
卷 93, 期 5, 页码 1143-1150出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0025315412001890
关键词
Mid-Atlantic Ridge; Charlie-Gibbs Fracture Zone; megafauna; video observations
资金
- Minobrnauki of the Russian Federation [8664]
Megafauna from the Charlie-Gibbs Fracture Zone (northern Mid-Atlantic Ridge) based on video observations from submersibles was analysed. Species composition was examined, frequency of species occurrence on the fracture wall and its base (depth range from 1740 m to 3100 m) and density of megafauna in the depression at the fracture zone bottom (4200-4500 m depth) were evaluated. At depths between 1700 and 2500 m hexactinellid sponges were most common and diverse. Deeper parts of the wall and its base were dominated by anthozoans (especially gorgonian corals) and echinoderms. A set of dominant species in the lower bathyal in the study area was different from that on the lower continental slope in the north-east Atlantic (Porcupine Seabight). An important contribution to local species richness of 'rare' species was demonstrated. The elpidiid holothurian, Kolga nana, occurred at high density in the abyssal depression.
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