Search for dissertations about: "insects diversity, richness and abundance"
Found 3 swedish dissertations containing the words insects diversity, richness and abundance.
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1. Butterfly Diversity and Dispersal in Fragmented Grasslands
Abstract : During the last decades, the distribution and abundance of many European species of birds, plants and insects in agricultural landscapes have declined due to agricultural intensification. To be able to mitigate these declines, it is essential to know the relative importance on local and regional ecological processes on population persistence and patterns of species richness. READ MORE
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2. What are the effects of natural versus human-caused acidity on stream species diversity and ecosystem functioning?
Abstract : Human activities have caused acidification of freshwater systems on a large scale resulting in reduced species diversity and ecological functioning in many lakes and streams. However, many naturally acidic freshwater systems have also been found, for instance in northern Sweden. READ MORE
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3. Old-Growth Forests in the High Coast Region in Sweden and Active Management in Forest Set-Asides
Abstract : In today´s intensively managed landscape, very few forests with old-growth characteristics and little human impact exist. One of the rare exceptions is pine forests on rocky soils, a forest type which has probably escaped extensive human use because of its low productivity. READ MORE