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The importance of flower resources and habitat configuration for bumblebees (Bombus) in a fragmented agricultural landscape

Heintz, Ragnhild Elisabeth
Master thesis
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URI
http://hdl.handle.net/11250/187013
Date
2013-08-23
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  • Master's theses (INA) [593]
Abstract
Bumblebees are important pollinators of crops and wild flowers, and the observed decrease in

natural bumblebee populations are therefore an increasing cause of concern. The aim of this

thesis was to evaluate how bumblebees are affected by different variables in the fragmented

landscape. The questions raised were if the density of flowering plants and habitat

configuration could explain the species richness, abundance and size of bumblebees.

Questions about preferred forage plant species were also addressed. The study was conducted

during the summer of 2012 in south-east Norway, which has a landscape dominated by a

mixture of intensive cereal production and coniferous forests. 13 different species of

bumblebees were found in this area and the results showed that the total abundance and

species richness of social bumblebees were positively influenced by the density of flowering

plants. Results show no significant effects of area, circumference or type of remnant on

species richness, abundance or size of bumblebees. The preferred plant species for

bumblebees in general were preferred by all observed species. Between casts, differences in

preferred plant species were found. The results also indicate that bumblebees prefer perennial

plants over annuals.
Publisher
Norwegian University of Life Sciences, Ås

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