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Edge or dispersal effects - Their relative importance on arthropod densities on small islands
Stockholm University, Faculty of Science, Department of Botany.
Stockholm University, Faculty of Science, Department of Botany.
Stockholm University, Faculty of Science, Department of Botany.
2009 (English)In: Basic and Applied Ecology, ISSN 1439-1791, E-ISSN 1618-0089, Vol. 10, 475-484 p.Article in journal (Refereed) Published
Abstract [en]

Abstract Dispersal behaviour and edge effects are two potential factors determining population densities, and both effects are likely to vary with patch size. However, the relative importance of these two effects may be hard to separate because they may produce similar patterns. Here, we separate these two effects on population densities of seven groups of arthropods on small islands. To separate dispersal behaviour and edge effects, we use the fact that the slope of the density–area relationships (DAR-slope) should change with the absolute rates of dispersal, as would occur in response to island isolation, whereas the edge effect is expected not to be dependent on island isolation. For lycosid spiders, parasitic wasps and possibly herbivorous Homoptera DAR-slopes changed between isolated and non-isolated islands, suggesting dispersal behaviour to berelatively more important for explaining variation in their densities. Other arthropods (ants and Collembola), typically those with a predicted low dispersal among islands, showed similar DAR-slopes between isolated and non-isolated islands consistent with dominant edge effects. For two groups (web spider sand Diptera) the results were inconclusive. We conclude that both migratory processes and edge effects should be considered in the evaluation of patch size and isolation on density–area relationships.

Place, publisher, year, edition, pages
2009. Vol. 10, 475-484 p.
Keyword [en]
Lycosidae, Emmigration, Immigration, Metacommunity, Patch area, spatial subsidies
National Category
Ecology
Research subject
Ecological Botany
Identifiers
URN: urn:nbn:se:su:diva-27214ISI: 000268839500010OAI: oai:DiVA.org:su-27214DiVA: diva2:212931
Available from: 2009-04-24 Created: 2009-04-24 Last updated: 2017-12-13Bibliographically approved
In thesis
1. The Spider and the Sea: Effects of marine subsidies on the role of spiders in terrestrial food webs
Open this publication in new window or tab >>The Spider and the Sea: Effects of marine subsidies on the role of spiders in terrestrial food webs
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The purpose of this study was to identify if terrestrial arthropod predators on Baltic Sea shores vary in their use of marine versus terrestrial food items, and to construct a bottom-up food web for Baltic Sea shores. The inflow of marine nutrients in the area consists mainly of marine algal detritus and emerging aquatic insects (e.g. phantom midges, Chironomidae). Diets of coastal arthropods were examined using carbon and nitrogen stable isotope analysis, and a two source mixing model was used to examine proportions of marine carbon to diets. The results suggest that spiders are the terrestrial predators mainly utilizing nutrients and energy of marine origin on Baltic Sea shores, while insect predators such as beetles and hemipterans mainly utilize nutrients and energy derived from terrestrial sources, possibly due to differences in hunting behaviour. That spiders are the predators that benefit the most from the marine inflow suggest that eventual effects of marine subsidies for the coastal ecosystem as a whole are likely mediated by spiders.

Place, publisher, year, edition, pages
Stockholm: Department of Botany, Stockholm University, 2009. 44 p.
Keyword
marine subsidies, food webs, stable isotopes, shore ecosystems, predators, spiders, Pardosa, algae, emerging insects
National Category
Ecology
Research subject
Plant Ecology
Identifiers
urn:nbn:se:su:diva-27227 (URN)978-91-7155-877-0 (ISBN)
Public defence
2009-06-05, föreläsningssalen, Botanicum, Lilla Frescativägen 5, Stockholm, 13:00 (English)
Opponent
Supervisors
Available from: 2009-05-14 Created: 2009-04-26 Last updated: 2009-04-27Bibliographically approved

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