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  • 1.
    Svensson, Martin
    University of Skövde, School of Life Sciences.
    Strukturer i grus- och sandtäkter som styr förekomsten av bibagge Apalus bimaculatus i Västra Götalands län2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The report is an analysis of inventory data on apalus bimaculatus and colletes cunicularius from Länsstyrelsen in Västra Götalands County. Naturvårdsverket has designed a program for apalus bimaculatus because it is noted on the red list as near threatened (NT). Apalus bimaculatus is an orange beetle found in bare, sun-exposed, sandy areas where their host species colletes cunicularius live. Apalus bimaculatus live partly as a parasite in the site of colletes cunicularius. Only during the mating season, a few weeks in late March and early April, is apalus bimaculatus active above ground. This is the reason why it was an overlooked species in the Swedish beetle fauna until a few years ago. Today the species mainly live in gravel- and sandpits. Now when the use of gravel and sand decreases in favor to crushed rock the gravel- and sandpits as well as the species’ habitat is at risk to disappear. The report analyzes inventory data trying to find the structures in the pits that govern the existence of apalus bimaculatus and colletes cunicularius. Analyses were by regression trees, correlations and t-test. The most important explanatory factor for the existence of apalus bimaculatus in a pit was the presence of colletes cunicularius. To more efficiently find this difficult inventoried species in future surveys it may be a good idea to concentrate on looking for sites of colletes cunicularius.

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