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Community structure convergence despite different species composition: community assembly in saproxylic Coleoptera
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Animal Ecology.
(English)Manuscript (Other academic)
Abstract [en]

Community assembly can be viewed as the trajectory, regarding species composition and community structure, a community exhibits over time as new species fail or succeed in establishing. Community assembly in saproxylic (wood-living) Coleoptera was studied in two boreal coniferous forest types, recently burnt forest and old-growth forest, by exposing 88 Norway spruce, Picea abies, bolts (0.5 m long pieces of bole) to colonization for increasingly longer times (0.5, 1, 2, 4, and 8 weeks). The final 8-week communities diverged in species composition but converged regarding community structure measures, such as species richness. In both forest types cambivores dominated the final state. Assemblages became increasingly similar in species composition along the assembly trajectory in old-growth forest but not in burnt forest. Assemblages in the two forest types followed different trajectories regarding species composition. They also showed clear differences in evenness and species identity of the bolt-dominant species (species with the highest abundance in a particular bolt). Overall, burnt-forest bolts had a more open community with higher evenness and a more diverse selection of bolt-dominants, while old-growth bolts had a more closed community highly dominated by Dryocoetes autographus (Scolytinae), a species common also in managed forest. During assembly, burnt-forest bolts had a higher proportion fungivores than old-growth bolts. Proportion predators was higher during assembly than in the final state in both forest types. The last two results showed that guilds important during assembly were found in lower proportions in the final assemblages.

National Category
Ecology
Research subject
Animal Ecology
Identifiers
URN: urn:nbn:se:uu:diva-88761OAI: oai:DiVA.org:uu-88761DiVA: diva2:159027
Available from: 2009-02-06 Created: 2009-02-06 Last updated: 2010-01-14
In thesis
1. Community Assembly and Spatial Ecology of Saproxylic Coleoptera
Open this publication in new window or tab >>Community Assembly and Spatial Ecology of Saproxylic Coleoptera
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Community assembly is the process deciding inclusion/exclusion of species in a developing community. Spatial ecology integrates spatial habitat factors with local biotic interactions within a given patch.

I used standardized tree bolts (0.35-1 m long) to sample saproxylic (wood living) beetles in natural and managed forest types.

Density-dependent effects were more intense in old-growth coniferous forest than in burnt forest. The final-state assemblages in these two forest types diverged regarding species composition but converged regarding community structure. The communities also followed forest-type specific assembly trajectories.

Order of arrival can influence the species assemblage, I found priority effects when comparing the reproductive success of two cerambycid species. A two-week head start had a positive effect on fitness in both species. Different fitness components were affected in the two species: offspring number in Acanthocinus aedilis and offspring quality in Rhagium inquisitor.

In birch-living Coleoptera a large part of variance in species composition could be explained by habitat variables (22.9 %), such as forest type, or spatial variables (15.8 %), such as distance apart. The assemblages in deciduous sites responded to distance apart and showed positive spatial autocorrelation up to a distance of 80 km. For assemblages in deciduous sites a metacommunity perspective is warranted – on a surprisingly large scale.

I compared two regions, one more fragmented and one less fragmented, (with 2.2 % more deciduous forest in the landscape). The effects of habitat fragmentation was primarily found in mature coniferous forest. Host-tree patches in this matrix forest were perceived as matrix by the Coleoptera in the more fragmented region but as habitat in the less fragmented region.

Some of my study sites consisted of protected old-growth forest. These were embedded in a landscape dominated by forestry. These protected areas were invaded by generalist species, thriving in managed forests.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2009. 36 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 604
National Category
Ecology
Research subject
Animal Ecology
Identifiers
urn:nbn:se:uu:diva-88765 (URN)978-91-554-7427-0 (ISBN)
Public defence
2009-03-20, Zootissalen, EBC, Villavägen 18, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2009-02-27 Created: 2009-02-06 Last updated: 2009-03-31Bibliographically approved

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Victorsson, Jonas

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