The combined effects of biotic and abiotic stress on species richness and connectance

Devdutt Kulkarni, Frédérik De Laender

Research output: Contribution to journalArticle

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Abstract

Food web structure and species richness are both subject to biotic (e.g. predation pressure and resource limitation) and abiotic stress (e.g. environmental change). We investigated the combined effects of both types of stress on richness and connectance, and on their relationship, in a predator-prey system. To this end, we developed a mathematical two trophic level food-web model to investigate the effects of biotic and abiotic stress on food web connectance and species richness. We found negative effects of top-down and bottom-up control on prey and predator richness, respectively. Effects of top-down and bottom-up control were stronger when initial connectance was high and low, respectively. Bottom-up control could either aggravate or buffer negative effects of top-down control. Abiotic stress affecting predator richness had positive indirect effects on prey richness, but only when initial connectance was low. However, no indirect effects on predator richness were observed following direct effects on prey richness. Top-down and bottom-up control selected for weakly connected prey and highly connected predators, thereby decreasing and increasing connectance, respectively. Our simulations suggest a broad range of negative and positive richness-connectance relationships, thereby revisiting the often found negative relationship between richness and connectance in food webs. Our results suggest that (1) initial foodweb connectance strongly influences the effects of biotic stress on richness and the occurrence of indirect effects on richness; and (2) the shape of the richness-connectance relationship depends on the type of biotic stress.

Original languageEnglish
Article numbere0172828
JournalPLoS ONE
Volume12
Issue number3
DOIs
Publication statusPublished - 1 Mar 2017

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Food Chain
biotic stress
abiotic stress
food webs
predators
species diversity
predator-prey relationships
Predator prey systems
Buffers
buffers
predation
Pressure

Keywords

  • Biodiversity
  • Food Chain
  • Models, Biological
  • Stress, Physiological

Cite this

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The combined effects of biotic and abiotic stress on species richness and connectance. / Kulkarni, Devdutt; De Laender, Frédérik.

In: PLoS ONE, Vol. 12, No. 3, e0172828, 01.03.2017.

Research output: Contribution to journalArticle

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