Publication Details

Category Text Publication
Reference Category Book chapters
DOI 10.1016/B978-0-12-386475-8.00005-8
Title (Primary) The role of body size in complex food webs: a cold case
Title (Secondary) The role of body size in multispecies systems
Author Jacob, U.; Thierry, A.; Brose, U.; Arntz, W.E.; Berg, S.; Brey, T.; Fetzer, I.; Jonsson, T.; Mintenbeck, K.; Möllmann, C.; Petchey, O.L.; Riede, J.O.; Dunne, J.A.
Publisher Belgrano, A.; Reiss, J.
Source Titel Advances in Ecological Research
Year 2011
Department UMB
Volume 45
Page From 181
Page To 223
Language englisch
Keywords Network structure; Ecosystem; Food web; Weddell Sea

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.

Persistent UFZ Identifier
Jacob, U., Thierry, A., Brose, U., Arntz, W.E., Berg, S., Brey, T., Fetzer, I., Jonsson, T., Mintenbeck, K., Möllmann, C., Petchey, O.L., Riede, J.O., Dunne, J.A. (2011):
The role of body size in complex food webs: a cold case
In: Belgrano, A., Reiss, J. (eds.)
The role of body size in multispecies systems
Advances in Ecological Research 45
Academic Press / Elsevier, London, p. 181 - 223 10.1016/B978-0-12-386475-8.00005-8