The susceptibility of species to extinctions in model communities
2011 (English)In: Basic and Applied Ecology, ISSN 1439-1791, Vol. 12, no 7, 590-599 p.Article in journal (Refereed) Published
Despite the fact that the loss of a species from a community has the potential to cause a dramatic decline in biodiversity,for example through cascades of secondary extinctions, little is known about the factors contributing to the extinction riskof any particular species. Here we expand earlier modeling approaches using a dynamic food-web model that accounts forbottom-up as well as top-down effects. We investigate what factors influence a species’ extinction risk and time to extinction ofthe non-persistent species.We identified three basic properties that affect a species’ risk of extinction. The highest extinction risk is born by specieswith (1) low energy input (e.g. high trophic level), (2) susceptibility to the loss of energy pathways (e.g. specialists with fewprey species) and (3) dynamic instability (e.g. low Hill exponent and reliance on homogeneous energy channels when feedingon similarly sized prey).Interestingly, and different from field studies, we found that the trophic level and not the body mass of a species influencesits extinction risk. On the other hand, body mass is the single most important factor determining the time to extinction of aspecies, resulting in small species dying first. This suggests that in the field the trophic level might have more influence on theextinction risk than presently recognized.
Place, publisher, year, edition, pages
Elsevier, 2011. Vol. 12, no 7, 590-599 p.
IdentifiersURN: urn:nbn:se:liu:diva-73619DOI: 10.1016/j.baae.2011.09.002ISI: 000299149700005OAI: oai:DiVA.org:liu-73619DiVA: diva2:475167
funding agencies|ESF||German Research Foundation| BR 2315/13 BR 2315/11-1 |2012-01-102012-01-102012-03-31