Search for dissertations about: "habitat loss"

Showing result 1 - 5 of 76 swedish dissertations containing the words habitat loss.

2. 1. Habitat compensation in nature-like fishways : Effects on benthos and fish

   Author : Stina Gustafsson; Olle Calles; Martin Österling; Jostein Skurdal; Paul Giller; Karlstads universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Biocanal; biodiversity; brown trout; freshwater pearl mussel; functional feeding groups; habitat heterogeneity; large woody debris; macroinvertebrates; PIT-tag; salmonids; Biology; Biologi;

   Abstract : The construction of nature-like fishways has become an increasingly common measure to restore longitudinal connectivity in streams and rivers affected by hydroelectric development. These fishways also have the potential to function as habitat compensation measures when running waters have been degraded or lost. READ MORE

4. 2. The long-term decline of the grey-sided vole (Clethrionomys rufocanus) in boreal Sweden: importance of focal forest patch and matrix

   Author : Pernilla Christensen; Birger Hörnfeldt; Rolf A. Ims; Umeå universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; : Destructive sampling; high quality habitat; focal habitat; landscape; habitat fragmentation; threshold; clear-cut; patch size and quality; long-term time-series; Terrestrial ecology; Terrestisk ekologi;

   Abstract : There has been a long-term decline in number of cyclic vole populations in boreal Sweden since the 1970s. Several hypotheses have been suggested to explain this decline. Commonly for C. glareolus, C. READ MORE

5. 3. Semi-natural grasslands: landscape, history and plant species diversity

   Author : Lotten Jönsson; Institutionen för naturgeografi och ekosystemvetenskap; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; aerial photographs; Land-use history; cadastral maps; habitat continuity; fragmentation; landscape context; habitat connectivity;

   Abstract : This thesis explores the impact of past and present landscape and habitat structure on present levels of vascular plant species diversity within fragmented semi-natural grasslands. Within the Jordtorp-area, a mosaic agricultural landscape on the island of Öland (Sweden), historical land-use changes and the development of semi-natural grasslands was characterized, over a time-period of almost 300 years, using historical maps, aerial photographs and a high-resolution imagery. READ MORE

6. 4. Species extinctions in food webs : local and regional processes

   Author : Anna Eklöf; Bo Ebenman; Peter Münger; Marcel Holyoak; Linköpings universitet; []
   Keywords : Extinction; food web; metacommunity; dispersal; species loss; migration; habitat fragmentation; connectance; NATURAL SCIENCES; NATURVETENSKAP;

   Abstract : Loss of biodiversity is one of the most severe threats to the ecosystems of the world. The major causes behind the high population and species extinction rates are anthropogenic activities such as overharvesting of natural populations, pollution, climate change and destruction and fragmentation of natural habitats. READ MORE

7. 5. Management Practices for Dealing with Uncertainty and Change : Social-Ecological Systems in Tanzania and Madagascar

   Author : Maria Tengö; Thomas Elmqvist; Monica Hammer; Carl Folke; Kamaljit Bawa; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; resilience; ecosystem services; local ecological knowledge; traditional ecological knowledge; ecosystem management; agroecosystems; dry tropical forest; social institutions; forest regeneration; sacred forests; taboos; community conservation; Southern Madagascar; Androy; Iraqw; management practices; habitat loss; small reserves; human-dominated ecosystems; social-ecological systems; Terrestrial; freshwater and marine ecology; Terrestisk; limnisk och marin ekologi;

   Abstract : The development of human societies rests on functioning ecosystems. This thesis builds on integrated theories of linked social-ecological systems and complex adaptive systems to increase the understanding of how to strengthen the capacity of ecosystems to generate services that sustain human well-being. READ MORE