Document Detail

Hoverfly (syrphidae) communities respond to varying structural retention after harvesting in canadian peatland black spruce forests.
MedLine Citation:
PMID:  17445365     Owner:  NLM     Status:  MEDLINE    
Variable retention harvesting (VRH), in which trees are removed at variable intensity and spatial configuration across the landscape, retains greater forest structural heterogeneity than traditional clear-cut harvesting and is being recommended as an alternative for sustainable management of the boreal forest. Little is known about its effects on forest fauna; thus, we studied the influence of one type of VRH (harvesting with advanced regeneration [HARP]) on the Syrphidae (Diptera) community in northern Ontario forests of peatland black spruce (Picea mariana). We examined the effects of varying structural retention (from unharvested through partial retention to clear-cut) on syrphid species richness and abundance, and abundance of functional assemblages. Greater species richness and population abundances were found generally in harvested than in unharvested forests. Overall species richness and the abundance of four species (Platycheirus rosarum, Toxomerus marginatus, Xylota annulifera, and X. tuberculata) and larval predators were all higher in both clear-cut sites and those with structural retention than in unharvested sites. Similarly, overall species richness and the abundance of nine species were higher in clear-cut than in unharvested sites. Species responses are discussed in an ecological context. Differences among the levels of forest retention harvesting were relatively minor compared with those of the clear-cut and unharvested area, suggesting that local habitat characteristics may play a more important role in determining the syrphid community than the landscape configuration. However, a landscape level effect was evident, suggesting that syrphids may be useful in reflecting changes in stand structure at the landscape scale.
A M Deans; S M Smith; J R Malcolm; W J Crins; M I Bellocq
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental entomology     Volume:  36     ISSN:  0046-225X     ISO Abbreviation:  Environ. Entomol.     Publication Date:  2007 Apr 
Date Detail:
Created Date:  2007-04-20     Completed Date:  2007-06-04     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7502320     Medline TA:  Environ Entomol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  308-18     Citation Subset:  IM    
Faculty of Forestry, University of Toronto, 33 Willcocks St., Toronto, Ontario, Canada M5S 3B3.
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MeSH Terms
Conservation of Natural Resources*
Diptera / growth & development,  physiology*
Forestry / methods*
Picea / growth & development*
Population Dynamics
Population Growth
Species Specificity

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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