Benthic trophic networks of the southern North Sea

Autor(en)

Jan Steger, Hendrik Pehlke, Benoit Lebreton, Thomas Brey, Jennifer Dannheim

Abstrakt

We examined whether taxonomically distinct benthic communities from contrasting sediments in the German Bight (southern North Sea) also differ in their trophic structure. As a case study, we compared the Amphiura filiformis community (AFC) of silty sands and the Bathyporeia− Tellina community (BTC) of fine sands using a combination of stable isotope analysis and data on trophic interactions. Differences between the food webs were evident in the feeding guild composition of important primary consumers: deposit and interface feeders are the most diverse primary consumer guilds in the AFC, whereas suspension and interface feeders play a major role in the BTC, reflecting differences in physical properties and food availability at the sediment−water interface. While all primary consumer guilds had the same trophic level (TL) in the AFC, deposit feeders of the BTC occupied a trophic position intermediate between other primary and higher-order consumer guilds, likely explained by partially incomplete knowledge of their trophic ecology and selective feeding, including the ingestion of meiofauna. Most food web properties, however, were similar between the AFC and BTC: they mainly depend on pelagic primary production, reach TL 4 and are characterized by a prevalence of generalist higher-order consumers. Furthermore, both trophic networks had similar linkage densities and high directed connectance, the latter feature suggesting considerable food web robustness. Our findings suggest that although communities in the German Bight differ in some aspects of their trophic structure, they share a similar food web topology, indicating a comparable degree of resilience towards natural and anthropogenic disturbances.

Organisation(en)

Institut für Paläontologie

Externe Organisation(en)

Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung, Helmholtz-Institut für Funktionelle Marine Biodiversität, Carl von Ossietzky Universität Oldenburg, Université de La Rochelle

Journal

Marine Ecology Progress Series

Band

628

Seiten

17-36

Anzahl der Seiten

20

ISSN

0171-8630

DOI

https://doi.org/10.3354/meps13069

Publikationsdatum

10-2019

Peer-reviewed

Ja

ÖFOS 2012

106021 Meeresbiologie, 106026 Ökosystemforschung

Schlagwörter

ASJC Scopus Sachgebiete

Ecology, Evolution, Behavior and Systematics, Aquatic Science, Ecology

Sustainable Development Goals

SDG 14 – Leben unter Wasser

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/ea0a6184-2b85-426c-8127-1fbf88b3e07f