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What is the matrix ? A sea or a habitat for saproxylic Coleoptera in deciduous forest fragments in boreal forest
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Animal Ecology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Animal Ecology.
(English)Manuscript (Other academic)
Abstract [en]

We compared two regions that differed in the level of habitat fragmentation regarding deciduous trees. Brassberget, a less fragmented region, and Gåsberget, a more fragmented region that had a 2 % lower proportion of deciduous forest than Brassberget. We investigated the assemblage of saproxylic Coleoptera in birch in remnant patches of deciduous forest as well as in two matrix forest-types: mature coniferous forest and clear-cuts. We exposed 240 standardized birch bolts (tree bole, 1m in length) to natural colonization in a total of 30 forest sites and then collected Coleoptera emerging from those bolts. The saproxylic Coleoptera assemblages reflected the underlying regional difference in level of fragmentation. In the less fragmented region the Coleoptera assemblages in deciduous remnants and mature coniferous forest were largely similar in species composition, guild proportions, species richness, evenness, and dominance. The clear-cuts in this region differed from the other two forest types in all these community measures. In the more fragmented region there was a different pattern. In that region, the deciduous remnants were different from the matrix forest types, both mature coniferous sites and clear-cuts, in species composition, guild proportions, and evenness whereas the two matrix forest types had largely converged regarding all these community measures. Regional comparisons of forest types, showed that there was forest-type convergence in guild proportions in both deciduous remnants and in clear-cuts but regional divergence in mature coniferous sites. Thus, the effects of increasing habitat fragmentation was primarily found in mature coniferous forest. We conclude that in the less fragmented region, mature matrix forest retain habitat characteristics similar enough to natural deciduous forest to allow a saproxylic Coleoptera fauna similar to the one in deciduous forest-fire remnants to develop.

National Category
Ecology
Research subject
Animal Ecology
Identifiers
URN: urn:nbn:se:uu:diva-88762OAI: oai:DiVA.org:uu-88762DiVA: diva2:159028
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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