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JYX - Tienpientareiden merkitys vaihtoehtoisina elinympäristöinä perinneympäristöjen luteille (full record)
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Species diversity is decreasing globally mainly due to human induced habitat destruction and degradation. In Finland, as in other European countries, the intensification of agriculture during the last century has led to drastic declines in semi-natural grasslands created and maintained by traditional animal husbandry. Many remaining areas also suffer from eutrophication, vegetation overgrowth and invasions of alien species. Furthermore, many species typical to semi-natural grasslands have become threatened or endangered because of the destruction and degradation of their primary habitats. However, it has been suggested that these species could also exploit alternative habitats resembling semi-natural grasslands. Such alternative habitats include small airfields, power line rights-of-ways and road verges. The aim of this thesis was to study the importance of road verges as alternative habitats to meadow Heteroptera. The data was collected during the summer of 2014 from 12 road verges and 24 semi-natural grasslands located in Central Finland using vegetation sweeping and window flight trapping. Half of the semi-natural grasslands were managed by cutting and the other half by grazing. The results show that the heteroptera fauna found from road verges consisted mainly species also present in semi-natural grasslands. Yet, species richness was significantly lower in road verges than in cut semi-natural grasslands. The species composition also differed significantly between road verges and both cut and grazed semi-natural grasslands, even though species diversity did not. Furthermore, the species composition was found to be quite heterogeneous also between different road verges. Finally, contrary to semi-natural grasslands, in road verges the observed diversity of heteroptera species could not be explained by the species diversity of vascular plants. The results indicate that even if road verges can serve as alternative habitats to some heteroptera species, they are not able to sustain whole communities similar to semi-natural grasslands. To increase the value of road verges as alternative habitats in the future, it is recommended to pay more attention especially to the frequency and timing of cutting and the removal of the cut material.
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Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty.
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Tienpientareiden merkitys vaihtoehtoisina elinympäristöinä perinneympäristöjen luteille
Bio- ja ympäristötieteiden laitos
Department of Biological and Environmental Science
Ecology and evolutionary biology
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Pro gradu -tutkielmat [24081]
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