期刊
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
卷 98, 期 -, 页码 407-411出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.dsr2.2013.08.013
关键词
ECOMAR; Mid-Atlantic Ridge; Charlie-Gibbs Fracture Zone; ROV video transect; Sampling bias; Fish; Demersal; Density; Abundance; Reaction
类别
资金
- UK Natural Environment Research Council [NE/C512961/1]
- Natural Environment Research Council [NE/C513018/1, NE/C512996/1, noc010009, NE/C51300X/1, NE/C512961/1, NE/C512988/1] Funding Source: researchfish
- NERC [NE/C513018/1, NE/C512996/1, NE/C512961/1, NE/C51300X/1, NE/C512988/1, noc010009] Funding Source: UKRI
Demersal fish were assessed by remotely operated vehicle (ROV) video transects at sites to the NE, NW (54 degrees N), SE and SW (49 degrees N) of the Charlie-Gibbs Fracture Zone (CGFZ) at ca. 2500 m depth on the Mid-Atlantic Ridge. At each site, three different slope categories (flat, 10 degrees slope and > 30 degrees slope) were sampled with four transects, each surveying 2000 m(3) of suprabenthic water. This resulted in 12 high-definition video transects at every site, covering a total of 24,000 m(3) suprabenthic water. Six species were observed; which was fewer than in surveys using baited landers (19 species) and trawls (26 species) in the same area. Bathysaurus ferox, Halosauropsis macrochir, Antimora rostrata and Polyacanthonotus challengeri did not vary in density between sites, while Cotyphaenoides brevibarbis and Coryphaenoides artnatus were significantly more abundant at the northern sites; the latter supporting findings using baited landers. The halosaur H. macrochir was the only species affected by slope. The majority of observed fish showed no reaction to one or more of the stimuli produced by the ROV, however burst swimming was observed at least once in all species except B. ferox. The most abundant species, C brevibarbis, was particularly affected by the presence of the ROV. (C) 2013 Elsevier Ltd. All rights reserved.
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