Vattenriket i fokus


Vattenriket i fokus 2007:03

Inventering av solitära bin väster om Åhus på
Ripa Sandar, Horna Sandar och Sånnarna inom Biosfärområde Kristianstads Vattenrike sommaren 2006


Författare Mikael Sörensson på uppdrag av Biosfärkontoret Kristianstads Vattenrike


Sandbi
Foto Patrik Olofsson/N

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Abstract

This report concerns an insect survey performed during the summer of 2006 in a sandy area around the village of Ripa and west of Åhus in eastern Scania, southernmost Sweden. Although the survey focused on solitary bee species other insect groups were sampled and documented as well. Altogether 47 nationally redlisted species of insects were found, 22 of which were made up by solitary bee and bumble bee species, among them the very rare Andrena bluethgeniEN Stoeck., A. morawitziEN Thoms., Dufourea inermisEN (Nyl.) and Megachile lagopodaVU (L.). The remaining 25 redlisted insect species included several rare and threatened indicators for sandy pastures, inland dunes and dry meadows, among them the beetles Harpalus hirtipesEN (Panz.), H. melancholicusVU Dej., H. froelichiiNT Sturm, Copris lunarisVU (L.), Heptaulacus susEN (Herbst) and H. villosusNT (Gyll.). Altogether eight species are targeted for national action plans for conservation. In addition, numerous other more or less rare and/or ecologically specialized species of various insect groups were recorded. It is assumed that the traditional use of fallows and cyclically interrupted cultivation of land considerably contributed to a small-scale, mosaic landscape of high internal dynamics where parameters such as rich and irregularly positioned floral resources, large floral variation, presence of larger areas of open sand and rotating pasture use created an almost optimal environment for many threatened insect species. In order to stabilize and enhance the species diversity in the future the continued use of the traditional methods of farming and agriculture, including use of long-term fallows, is strongly recommended.

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