Ferrantia 76

Carlo Braunert 2017

Die Rüsselkäferfauna (Coleoptera, Curculionoidea) der Silikatmagerrasen im nördlichen Luxemburg

Ferrantia 76, Musée national d’histoire naturelle, Luxembourg, 51 p.

publication date: 20 décembre 2017

price: 15 €

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Ferrantia 76Abstract:

The present paper presents the results of a survey of the weevil fauna (Coleoptera, Curculionoidea) on 9 dry open areas on acid soils in the northern part of Luxembourg. The data were collected from 1999 to 2014. The investigated habitats are remnants of formerly more widespread heathland and warm-dry steep valley sides carved in Devonian rocks. All specimens were collected by sweeping and beating herbaceous vegetation, shrubs and trees, sifting litter, mosses and grassroots or catching them directly by hand on their host plants. The investigation yielded a total of 141 weevil species with an average species number of 52, the number of species recorded in the 9 areas varying from 42 to 65. The records of 14 species are considered to be remarkable and their distribution patterns are discussed in detail. A comparative analysis of the faunas of the investigated sites leads to the conclusion that the species assemblages feeding on Quercus spec.- and Cytisus scoparius-shrubs and on Rumex acetosella, together with the weevils feeding on Genista pilosa, Calluna vulgaris and Teesdalia nudicaulis and the species of the leaf litter make up the characteristic fauna of the habitats. A further comparison is made with the weevil faunas of dry heathland on sandy soils and of dry, calcareous grassland, both located in the southern part of Luxembourg: The highest similarity of the fauna of the dry siliceous slopes on Devonian rocks is with the fauna of heathland habitats on sandy soils, although specific features of both faunas exist. The high number of species found underpins the importance of the investigated habitats as a diversity hotspot for weevils in Luxembourg and conservation measures should be considered in a near future.

 

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