Regime shifts in marine communities: a complex systems perspective on food web dynamics

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Johanna Yletyinen, Örjan Bodin, Benjamin Weigel, Marie C. Nordström, Erik Bonsdorff, Thorsten Blenckner
Publisher: The Royal Society Publishing
Publication year: 2016
Journal: Proceedings of the Royal Society B: Biological Sciences
Journal acronym: Proc R Soc B Biol Sci
Volume number: 283
Issue number: 1825
Start page: 1
End page: 8
eISSN: 1471-2954


Abstract

Species composition and habitats are changing at unprecedented rates in the world's oceans, potentially causing entire food webs to shift to structurally and functionally different regimes. Despite the severity of these regime shifts, elucidating the precise nature of their underlying processes has remained difficult. We address this challenge with a new analytic approach to detect and assess the relative strength of different driving processes in food webs. Our study draws on complexity theory, and integrates the network-centric exponential random graph modelling (ERGM) framework developed within the social sciences with community ecology. In contrast to previous research, this approach makes clear assumptions of direction of causality and accommodates a dynamic perspective on the emergence of food webs. We apply our approach to analysing food webs of the Baltic Sea before and after a previously reported regime shift. Our results show that the dominant food web processes have remained largely the same, although we detect changes in their magnitudes. The results indicate that the reported regime shift may not be a system-wide shift, but instead involve a limited number of species. Our study emphasizes the importance of community-wide analysis on marine regime shifts and introduces a novel approach to examine food webs.

Last updated on 2019-07-12 at 03:21