How habitat-modifying organisms structure the food web of two coastal ecosystems.

Journal Article (Journal Article)

The diversity and structure of ecosystems has been found to depend both on trophic interactions in food webs and on other species interactions such as habitat modification and mutualism that form non-trophic interaction networks. However, quantification of the dependencies between these two main interaction networks has remained elusive. In this study, we assessed how habitat-modifying organisms affect basic food web properties by conducting in-depth empirical investigations of two ecosystems: North American temperate fringing marshes and West African tropical seagrass meadows. Results reveal that habitat-modifying species, through non-trophic facilitation rather than their trophic role, enhance species richness across multiple trophic levels, increase the number of interactions per species (link density), but decrease the realized fraction of all possible links within the food web (connectance). Compared to the trophic role of the most highly connected species, we found this non-trophic effects to be more important for species richness and of more or similar importance for link density and connectance. Our findings demonstrate that food webs can be fundamentally shaped by interactions outside the trophic network, yet intrinsic to the species participating in it. Better integration of non-trophic interactions in food web analyses may therefore strongly contribute to their explanatory and predictive capacity.

Full Text

Duke Authors

Cited Authors

  • van der Zee, EM; Angelini, C; Govers, LL; Christianen, MJA; Altieri, AH; van der Reijden, KJ; Silliman, BR; van de Koppel, J; van der Geest, M; van Gils, JA; van der Veer, HW; Piersma, T; de Ruiter, PC; Olff, H; van der Heide, T

Published Date

  • March 2016

Published In

Volume / Issue

  • 283 / 1826

Start / End Page

  • 20152326 -

PubMed ID

  • 26962135

Pubmed Central ID

  • PMC4810843

Electronic International Standard Serial Number (EISSN)

  • 1471-2954

International Standard Serial Number (ISSN)

  • 0962-8452

Digital Object Identifier (DOI)

  • 10.1098/rspb.2015.2326


  • eng