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The Role of Body Size in Complex Food Webs: A Cold Case
University of Hamburg, Inst Hydrobiol & Fisheries Sci, Hamburg, Germany .
University of Sheffield, Dept Anim & Plant Sci, Western Bank, Sheffield S10 2TN, S Yorkshire, England / Microsoft Res, Cambridge, England .
Georg-August University Göttingen JF Blumenbach Inst Zool & Anthropol, Syst Conservat Biol Grp, Göttingen, Germany .
Alfred Wegener Inst Polar & Marine Res, Bremerhaven, Germany .
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2011 (English)In: Advances in Ecological Research, ISSN 0065-2504, E-ISSN 2163-582X, Vol. 45, 181-223 p.Article in journal (Refereed) Published
Abstract [en]

Human-induced habitat destruction, overexploitation, introduction of alien species and climate change are causing species to go extinct at unprecedented rates, from local to global scales. There are growing concerns that these kinds of disturbances alter important functions of ecosystems. Our current understanding is that key parameters of a community (e.g. its functional diversity, species composition, and presence/absence of vulnerable species) reflect an ecological network’s ability to resist or rebound from change in response to pressures and disturbances, such as species loss. If the food web structure is relatively simple, we can analyse the roles of different species interactions in determining how environmental impacts translate into species loss. However, when ecosystems harbour species-rich communities, as is the case in most natural systems, then the complex network of ecological interactions makes it a far more challenging task to perceive how species’ functional roles influence the consequences of species loss. One approach to deal with such complexity is to focus on the functional traits of species in order to identify their respective roles: for instance, large species seem to be more susceptible to extinction than smaller species. Here, we introduce and analyse the marine food web from the high Antarctic Weddell Sea Shelf to illustrate the role of species traits in relation to network robustness of this complex food web. Our approach was threefold: firstly, we applied a new classification system to all species, grouping them by traits other than body size; secondly, we tested the relationship between body size and food web parameters within and across these groups and finally, we calculated food web robustness. We addressed questions regarding (i) patterns of species functional/trophic roles, (ii) relationships between species functional roles and body size and (iii) the role of species body size in terms of network robustness. Our results show that when analyzing relationships between trophic structure, body size and network structure, the diversity of predatory species types needs to be considered in future studies.

Place, publisher, year, edition, pages
Elsevier, 2011. Vol. 45, 181-223 p.
Keyword [en]
Network structure, Ecosystem, Food web, Weddell Sea
National Category
Ecology
Research subject
Natural sciences; Ecological Modelling Group
Identifiers
URN: urn:nbn:se:his:diva-5812DOI: 10.1016/B978-0-12-386475-8.00005-8ISI: 000303215900005Scopus ID: 2-s2.0-80053185893OAI: oai:DiVA.org:his-5812DiVA: diva2:524274
Available from: 2012-04-30 Created: 2012-04-30 Last updated: 2017-06-15Bibliographically approved

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CiteExportLink to record
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Citation style
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