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Effects of poisoning nonindigenous slugs in a boreal forest

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Abstract:

This study examined the impact of poisoning nonindigenous slugs on abundance of other soil arthropod groups occurring on the soil surface of a boreal forest. The experimental design consisted of counting soil fauna under boxes from 20 plots during weekly surveys before (year 1) and after (year 2) treatment (metaldehyde poison) with control and experimental plots. Slug abundance was negatively affected by presence of slug poison, with an 80% decrease in slug numbers following treatment. Herbaceous cover did not differ between plots (control and experimental) but the amount eaten decreased (26%–15%) with poisoning. Nonindigenous taxa, including slugs, predominated in the macrofauna at this site, accounting for a third of the individuals and a half of the biomass. Possible explanations for the observed patterns in soil arthropod community relative to invasive species are discussed.

Cette étude traite de l'impact de l'empoisonnement des limaces non indigènes sur l'abondance d'autres groupes d'invertébrés du sol vivant à la surface du sol dans une forêt boréale. Le dispositif expérimental consistait en un dénombrement de la faune au sol sous des boîtes dans 20 places échantillons, au cours d'inventaires hebdomadaires avant (an 1) et après (an 2) traitement (empoisonnement au métaldéhyde) dans des places témoins et expérimentales. L'abondance des limaces était négativement affectée par la présence de poison à limaces, causant une diminution de 80 % des effectifs de limaces après traitement. Le couvert herbacé ne différait pas entre les places échantillons (témoins et expérimentales) mais la quantité mangée a diminué (26 à 15 %) avec l'empoisonnement. Les taxons non indigènes, incluant les limaces, prédominaient dans la macrofaune de ce site, comptant pour un tiers des individus et la moitié de la biomasse. Diverses explications des patrons de communautés d'invertébrés du sol sont discutées en regard des espèces envahissantes.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: February 1, 2004

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  • Published since 1971, this monthly journal features articles, reviews, notes and commentaries on all aspects of forest science, including biometrics and mensuration, conservation, disturbance, ecology, economics, entomology, fire, genetics, management, operations, pathology, physiology, policy, remote sensing, social science, soil, silviculture, wildlife and wood science, contributed by internationally respected scientists. It also publishes special issues dedicated to a topic of current interest.
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