Trophodynamics and functional feeding groups of North Sea fauna: a combined stable isotope and fatty acid approach.

Kürten, Benjamin, Frutos, Inmaculada, Struck, Ulrich, Painting, Suzanne J., Polunin, Nicholas V. C. and Middelburg, Jack J. (2013) Trophodynamics and functional feeding groups of North Sea fauna: a combined stable isotope and fatty acid approach. Biogeochemistry, 113 (1-3). pp. 189-212. DOI 10.1007/s10533-012-9701-8.

[img] Text
KÜRTEN et al. (2012) Biogeochemistry 10533_2012_9701_OnlinePDF.pdf - Published Version
Restricted to Registered users only

Download (1086Kb) | Contact
[img]
Preview
Text
10533_2012_9701_MOESM1_ESM.pdf - Supplemental Material

Download (245Kb) | Preview

Supplementary data:

Abstract

The trophodynamics of pelagic and benthic animals of the North Sea, North Atlantic shelf, were assessed using stable isotope analysis (SIA) of natural abundance carbon and nitrogen isotopes, lipid fingerprinting and compound-specific SIA (CSIA) of phospholipid-derived fatty acids (PLFAs). Zooplankton (z), epi- and supra-benthic macrofauna were collected in the Southern Bight, at the Oyster Grounds and at North Dogger, 111 km north of the Dogger Bank. The study included 22 taxonomic groups with particular reference to Mollusca (Bivalvia and Gastropoda) and Crustacea. Primary consumers (Bivalvia) were overall most 15N enriched in the southern North Sea (6.1‰) and more depleted in the Oyster Grounds (5.5‰) and at North Dogger (2.8‰) demonstrating differences in isotopic baselines for bivalve fauna between the study sites. Higher trophic levels also followed this trend. Over an annual cycle, consumers tended to exhibit 15N depletion during spring followed by 15N enriched signatures in autumn and winter. The observed seasonal changes of ? 15N were more pronounced for suspension feeders and deposit feeders (dfs) than for filter feeders (ffs). The position of animals in plots of ? 13C and ? 15N largely concurred with the expected position according to literature-based functional feeding groups. PLFA fingerprints of groups such as z were distinct from benthic groups, e.g. benthic ffs and dfs, and predatory macrobenthos. ? 13CPLFA signatures indicated similarities in 13C moiety sources that constituted ? 13CPLFA. Although functional groups of pelagic zooplankton and (supra-) benthic animals represented phylogenetically distinct consumer groups, ? 13CPLFA demonstrated that both groups were supported by pelagic primary production and relied on the same macronutrients such as PLFAs. Errors related to the static categorization of small invertebrates into fixed trophic positions defined by phylogenetic groupings rather than by functional feeding groups, and information on seasonal trophodynamic variability, may have implications for the reliability of numerical marine ecosystem models.

Document Type: Article
Additional Information: WOS:000317863300013
Keywords: Food Webs; Benthic–pelagic coupling; Food web structure; Phospholipid-derived fatty acids; Suprabenthos; Trophodynamics; Zooplankton; BENTHIC INVERTEBRATE COMMUNITIES; LONG-TERM CHANGES; ORGANIC-MATTER; SUPRABENTHIC FAUNA; CARBON-ISOTOPE; FOOD WEBS; DISCRIMINATION FACTORS; TROPHIC RELATIONSHIPS; ANTARCTIC KRILL; CLIMATE-CHANGE
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-N Experimental Ecology - Food Webs
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1007/s10533-012-9701-8
ISSN: 0168-2563
Projects: EUR-OCEANS, Jeddah Transect
Date Deposited: 12 Jul 2012 12:43
Last Modified: 16 Jun 2016 12:17
URI: http://oceanrep.geomar.de/id/eprint/14804

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...