Structural and functional diversity of Nematoda in relation with environmental variables in the Setúbal and Cascais canyons, Western Iberian Margin
Ingels, J.; Billett, D.S.M.; Kiriakoulakis, K.; Wolff, G.A.; Vanreusel, A. (2011). Structural and functional diversity of Nematoda in relation with environmental variables in the Setúbal and Cascais canyons, Western Iberian Margin. Deep-Sea Res., Part II, Top. Stud. Oceanogr. 58(23-24): 2354-2368. http://dx.doi.org/10.1016/j.dsr2.2011.04.002
In: Deep-Sea Research, Part II. Topical Studies in Oceanography. Pergamon: Oxford. ISSN 0967-0645; e-ISSN 1879-0100, more
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| Keywords |
Biodiversity
Chemistry > Geochemistry > Biogeochemistry
Composition > Community composition
Deep sea
Interactions
Meiofauna
Topographic features > Submarine features > Submarine canyons
Nematoda [WoRMS]
ANE, Atlantic [Marine Regions]; ANE, Europe, Iberian Peninsula [Marine Regions]
Marine/Coastal |
| Author keywords |
Submarine canyons; NE Atlantic; Western Iberian Margin; Deep sea;Meiofauna; Nematodes; Biogeochemistry; Trophic Diversity; CommunityStructure; Conceptual Scheme; Canyon-Fauna Interaction |
| Authors | | Top |
- Ingels, J., more
- Billett, D.S.M., more
- Kiriakoulakis, K.
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| Abstract |
Samples collected at two different depths (ca. 3200 and ca. 4200 m) in the Setúbal and Cascais canyons off the Portuguese coast, during the HERMES RRS Charles Darwin cruise CD179, were analysed for (1) sediment biogeochemistry (TOC, TN) and (2 composition, and structural and trophic diversity of nematode communities. Multivariate PERMANOVA analysis on the nematode community data revealed differences between sediment layers that were greater than differences between canyons, water depths, and stations. This suggests that biogeochemical gradients along the vertical sediment profile are crucial in determining nematode community structure. The interaction between canyon conditions and the nematode community is illustrated by biogeochemical patterns in the sediment and the prevalence of nematode genera that are able to persist in disturbed sediments. Trophic analysis of the nematode community indicated that non-selective deposit feeders are dominant, presumably because of their non-selective feeding behaviour compared to other feeding types, which gives them a competitive advantage in exploiting lower-quality food resources. This study presents a preliminary conceptual scheme for interactions between canyon conditions and the resident fauna. |
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