期刊
MARINE ECOLOGY-AN EVOLUTIONARY PERSPECTIVE
卷 38, 期 2, 页码 -出版社
WILEY
DOI: 10.1111/maec.12408
关键词
deep sea; macrobenthos; nematodes; polychaetes; submarine canyon; Whittard Canyon
资金
- Natural Environment Research Council [NE/J500227/1]
- Natural History Museum, London
- European Exchange Programme
- Natural Environment Research Council [noc010009] Funding Source: researchfish
- NERC [noc010009] Funding Source: UKRI
Large nematodes form an important component of deep-sea macrofaunal assemblages, but are often considered to be part of the meiobenthos and are rarely studied. We analysed the standing stocks, diversity, and functional group and genus-level composition of macrofaunal nematodes at lower bathyal depths (3,500m water depth) in the Whittard Canyon system (NE Atlantic) and on the adjacent continental slope. Five replicate sample sets were obtained using a Megacorer, at four locations (three canyon branches, one slope). Sediment samples were processed on a 500-m mesh to provide both nematode and polychaete data from the same samples. The dominant nematode genera included Paramesacanthion, Metacylicolaimus, Cylicolaimus and Phanodermopsis. Nematode standing stocks (density and biomass) increased significantly from slope to canyon locations. Similarly, nematode dominance increased substantially (and diversity decreased) from slope to canyon locations. Nematode feeding groups and tail shape groups also appeared to exhibit common trends across study locations. Nematode genus-level faunal composition varied significantly between slope and canyon locations. We describe and discuss the broadly similar trends detected in the matching polychaete data, noting some differences in the polychaete density and diversity responses. We suggest that the similar trends in macrofaunal nematode and polychaete ecology across our four study locations reflect responses to both changing sedimentology and food availability.
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