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Research article - Peer-reviewed, 2016

Restoration of semi-natural grasslands, a success for phytophagous beetles (Curculionidae)

Steiner, Magdalena; Öckinger, Erik; Karrer, Gerhard; Winsa, Marie; Jonsell, Mats

Abstract

Semi-natural pastures have rich plant and animal communities of high conservation value which depend on extensive management. As the area of such land decreases, abandoned semi-natural grasslands have been restored to re-establish biodiversity. Restoration schemes, which include thinning of woody plants and reintroduction of grazing, are mainly designed according to the responses of well-studied groups (such as vascular plants and birds). Weevils (Curculionidae) are a very diverse phytophagous beetle family. Here, we evaluated the restoration success of pastures for weevils (Curculionidae), by comparing their species diversity in abandoned, restored, and continuously grazed semi-natural pastures on 24 sites in central Sweden. Weevils were sampled by sweep-netting. We recorded 3019 weevil individuals belonging to 104 species. There was no statistically significant difference in species numbers between the pasture management treatments. However, weevil species composition of abandoned pastures differed from those in restored and continuously managed pastures, but there was no significant difference in community composition between restored and continuously grazed pastures. The abandoned sites tended to be dominated by polyphagous species, whereas the grazed sites contained more monophagous and oligophagous species. The number of weevil species was positively related to understory vegetation height and connectivity to other semi-natural grasslands and negatively related to the cover of trees and shrubs in the pastures. We conclude that restoration of abandoned semi-natural pastures is a good approach to restore weevil communities. To maintain a species rich weevil community, pastures should be managed to be relatively open, but still have patches of tall field-layer vegetation. Restoration and conservation measures should primarily be targeted on regions and landscapes where a high proportion of semi-natural grassland still remains.

Keywords

Agro-environment scheme; Biodiversity; Community composition; Grazing; Pasture; Weevils

Published in

Biodiversity and Conservation
2016, volume: 25, number: 14, pages: 3005-3022
Publisher: SPRINGER

Authors' information

Steiner, Magdalena
University of Fribourg
Swedish University of Agricultural Sciences, Department of Ecology
Karrer, Gerhard
University of Natural Resources and Life Sciences, Vienna (BOKU)
Winsa, Marie
Swedish University of Agricultural Sciences, Department of Ecology
Swedish University of Agricultural Sciences, Department of Ecology

UKÄ Subject classification

Ecology

Publication Identifiers

DOI: https://doi.org/10.1007/s10531-016-1217-4

URI (permanent link to this page)

https://res.slu.se/id/publ/78313