umu.sePublications
Change search
ReferencesLink to record
Permanent link

Direct link
Deterministic control on community assembly peaks at intermediate levels of disturbance
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
2009 (English)In: Oikos, ISSN 0030-1299, E-ISSN 1600-0706, Vol. 118, no 3, 471-479 p.Article in journal (Refereed) PublishedText
Abstract [en]

Despite long-standing research, the processes that drive community assembly remain poorly understood. We censused macroinvertebrate communities and measured flood disturbance in 17 Scandinavian mountain streams to assess the hypothesis that communities are shaped by stochastic processes under stable conditions, and increasingly by deterministic processes as disturbance becomes more severe. Each study stream was categorized as being stable (n=5), intermediate (n=7), or disturbed (n=5) depending on the severity of scouring floods. Following spring floods, the number of potential colonisers decreased with increasing disturbance, suggesting that disturbance filtered out species unable to cope with the stress involved. Communities at stable sites had the highest beta diversity, indicating that stochastic processes of community assembly were most important under the least disturbed conditions. In partial contrast with our predictions, the lowest beta diversity occurred between intermediate (not disturbed) sites, suggesting that increasing disturbance first enhances determinism but then rekindles stochasticity at severity levels beyond intermediate. Macroinvertebrate communities were shaped by deterministic processes, which recruit potential regional colonists depending on niche differences and disturbance conditions and by stochastic processes, which distribute the selected species randomly among individual localities. Although often considered opposing, stochastic and deterministic processes interact hierarchically, with relative strength modified by disturbance.

Place, publisher, year, edition, pages
Wiley-Blackwell, 2009. Vol. 118, no 3, 471-479 p.
Keyword [en]
species traits, stream, biodiversity, diversity, patterns, forest, invertebrates, heterogeneity, equilibrium, environment
National Category
Environmental Sciences Ecology
Identifiers
URN: urn:nbn:se:umu:diva-116022DOI: 10.1111/j.1600-0706.2008.16989.xISI: 000263967000018OAI: oai:DiVA.org:umu-116022DiVA: diva2:905273
Available from: 2016-02-22 Created: 2016-02-08 Last updated: 2016-02-22Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Lepori, FabioMalmqvist, Björn
By organisation
Department of Ecology and Environmental Sciences
In the same journal
Oikos
Environmental SciencesEcology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 68 hits
ReferencesLink to record
Permanent link

Direct link