Species-rich ecosystems are vulnerable to cascading extinctions in an indreasingly variable world
2012 (English)In: Ecology and Evolution, ISSN 2045-7758, Vol. 2, no 4, 858-874 p.Article in journal (Refereed) Published
Global warming leads to increased intensity and frequency of weather extremes. Such increased environmental variability might in turn result in increased variation in the demographic rates of interacting species with potentially important consequences for the dynamics of food-webs. Using a theoretical approach we here explore the response of food-webs to a highly variable environment. We investigate how species richness and correlation in the responses of species to environmental fluctuations affect the risk of extinction cascades. We find that the risk of extinction cascades increases with increasing species richness, especially when correlation among species is low. Initial extinctions of primary producer species unleash bottom-up extinction cascades, especially in webs with specialist consumers. In this sense, species-rich ecosystems are less robust to increasing levels of environmental variability than species-poor ones. Our study thus suggests that highly species-rich ecosystems like coral reefs and tropical rainforests might be particularly vulnerable to increased climate variability.
Place, publisher, year, edition, pages
John Wiley & Sons, 2012. Vol. 2, no 4, 858-874 p.
Biodiversity; climate change; environmental variability; ecological networks; extinction cascades; food-web; species interactions; stability; stochastic models; weather extremes
IdentifiersURN: urn:nbn:se:liu:diva-74700DOI: 10.1002/ece3.218OAI: oai:DiVA.org:liu-74700DiVA: diva2:490440