uu.seUppsala University Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Forest-type dependent response to spatial factors in birch-living saproxylic Coleoptera assemblages
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 studied spatial factors affecting the species composition of birch-living saproxylic (breeding in dead trees) Coleoptera. We sampled 30 forest sites in two regions by rearing Coleoptera from eight standardized birch-bolts (tree bole, 1m in length) from each site. 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. We compared three forest types – birch-dominated deciduous forest, mature coniferous forest, and clear-cuts – and found forest-type differences in response to spatial variables. The assemblages in deciduous sites responded to distance apart and showed some positive spatial autocorrelation up to a distance of 80 km. Assemblages in coniferous sites were different in the two regions whereas assemblages in clear-cuts did not respond to any spatial variables. Thus, the variation in species composition explained by spatial factors could mainly be attributed to spatial effects in two of the forest types: deciduous forest and mature coniferous forest. A conclusion from these results is that a metacommunity approach could be useful for understanding the community dynamics in the deciduous sites. Species in clear-cuts could conform more to the concept of patchy populations since the assemblages in those sites showed no spatial structure over the maximum inter-site distance of 105 km in this study.

National Category
Ecology
Research subject
Animal Ecology
Identifiers
URN: urn:nbn:se:uu:diva-88763OAI: oai:DiVA.org:uu-88763DiVA: diva2:159031
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

Open Access in DiVA

No full text

Authority records BETA

Victorsson, Jonas

Search in DiVA

By author/editor
Victorsson, Jonas
By organisation
Animal Ecology
Ecology

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 524 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf