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Påverkas tofsmesens förekomst av det svenska skogsbruket?
2004 (Swedish)Independent thesis Advanced level (degree of Master (One Year))Student thesis
Abstract [en]

Ever since the industrialisation a hundred years ago, forestry has affected the structure of the Swedish forest in a number of ways. The biggest effects have been caused by the reduction in stand age and amount of dead wood. Research has also confirmed a negative effect on the biodiversity as a result of the intensified forestry. The crested tit (Parus cristatus) is strongly connected to coniferous forest and there have been signs of a declining population trend in Sweden. For these reasons it is interesting to investigate how the crested tit is affected by forest structures, which was the purpose of this study. The study was performed in woods north of Molkom in the municipality of Karlstad. Twelve point-count routes were placed throughout the area. The stops represented the test areas where habitat measurements were performed. The measured variables were: basal area (m2/ha) for pine (Pinus sylvestris), spruce (Picea abies), deciduous trees, standing dead coniferous and deciduous trees, number of fallen logs, number of snags, average breast height diameter and the layers in the forest. I did not find any statistically significant differences between areas with and without crested tit for the investigated variables. Some non-significant trends however indicated that occurrence of dead wood might be important for the occurrence of the crested tit, but further investigation is needed for more definitive answers. One reason for not finding statistically significant results could be that the forest in the survey was not varied enough. Another reason could be that the study was conducted on a too low environmental scale. It is possible that a landscape approach is needed too find any effects.

Place, publisher, year, edition, pages
2004. , p. 16
Identifiers
URN: urn:nbn:se:kau:diva-49039Local ID: BIO D-4OAI: oai:DiVA.org:kau-49039DiVA, id: diva2:1097490
Subject / course
Biology
Available from: 2017-05-22 Created: 2017-05-22

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