Megafauna of the Charlie-Gibbs Fracture Zone (northern Mid-Atlantic Ridge) based on video observations

被引：11

作者：

Gebruk, A. V. ^{[1
]}

Krylova, E. M. ^{[1
]}

机构：

[1] Russian Acad Sci, PP Shirshov Inst Oceanol, Moscow 117997, Russia

来源：

JOURNAL OF THE MARINE BIOLOGICAL ASSOCIATION OF THE UNITED KINGDOM | 2013年 / 93卷 / 05期

关键词：

Mid-Atlantic Ridge; Charlie-Gibbs Fracture Zone; megafauna; video observations; ECHINODERMATA; HOLOTHUROIDEA; FLOOR; OCEAN;

D O I：

10.1017/S0025315412001890

中图分类号：

Q17 [水生生物学];

学科分类号：

071004 ;

摘要：

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.

引用

页码：1143 / 1150

页数：8

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