Body size and mobility explain species centralities in the Gulf of California food web

Olmo Gilabert, R., Navia, A. F., De La Cruz-Agüero, G., Molinero, Juan Carlos, Sommer, Ulrich and Scotti, Marco (2019) Body size and mobility explain species centralities in the Gulf of California food web Community Ecology, 20 (2). pp. 149-160. DOI 10.1556/168.2019.20.2.5.

168.2019.20.2.5.pdf - Published Version
Available under License Creative Commons: Attribution 4.0.

Download (2125Kb) | Preview

Supplementary data:


Anthropic activities impact ecosystems worldwide thus contributing to the rapid erosion of biodiversity. The failure of traditional strategies targeting single species highlighted ecosystems as the most suitable scale to plan biodiversity management. Network analysis represents an ideal tool to model interactions in ecosystems and centrality indices have been extensively applied to quantify the structural and functional importance of species in food webs. However, many network studies fail in deciphering the ecological mechanisms that lead some species to occupy the most central positions in food webs. To address this question, we built a high-resolution food web of the Gulf of California and quantified species position using 15 centrality indices and the trophic level. We then modelled the values of each index as a function of traits and other attributes (e.g., habitat). We found that body size and mobility are the best predictors of indices that characterize species importance at local, meso- and global scale, especially in presence of data accounting for energy direction. This result extends previous findings that illustrated how a restricted set of traitaxes can predict whether two species interact in food webs. In particular, we show that traits can also help understanding the way species are affected by and mediate indirect effects. The traits allow focusing on the processes that shape the food web, rather than providing case-specific indications as the taxonomy-based approach. We suggest that future network studies should consider the traits to explicitly identify the causal relationships that link anthropic impacts to role changes of species in food webs.

Document Type: Article
Keywords: Biodiversity; Centrality indices; Ecosystem functioning; Trait ecology
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-OEB Ökosystembiologie des Ozeans
OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-B Experimental Ecology - Benthic Ecology
Refereed: Yes
DOI etc.: 10.1556/168.2019.20.2.5
ISSN: 1585-8553
Date Deposited: 18 Nov 2019 10:15
Last Modified: 18 Nov 2019 10:15

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...