Search for dissertations about: "Species deletion"

Showing result 1 - 5 of 62 swedish dissertations containing the words Species deletion.

2. 1. Biodiversity and Species Extinctions in Model Food Webs

   Author : Charlotte Borrvall; Bo Ebenman; Owen Petchey; Linköpings universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; biodiversity; food webs; redundancy; relaxation time; stability; stochasticity; species deletion; species extinction; Biology; Biologi;

   Abstract : Many of the earth’s ecosystems are experiencing large species losses due to human impacts such as habitat destruction and fragmentation, climate change, species invasions, pollution, and overfishing. Due to the complex interactions between species in food webs the extinction of one species could lead to a cascade of further extinctions and hence cause dramatic changes in species composition and ecosystem processes. READ MORE

4. 2. Interaction strength and responses of ecological communities to disturbances

   Author : Maria Christianou; Bo Ebenman; Peter de Ruiter; Linköpings universitet; []
   Keywords : Species deletion; secondary extinctions; keystone species; keystone links; species reintroductions; Lotka-Volterra models; local stability; permanence; resilience; sensitivity analysis; diversity; complexity; food webs; competition communities; NATURAL SCIENCES; NATURVETENSKAP;

   Abstract : Ecological communities are continuously exposed to natural or anthropogenic disturbances of varied intensity and frequency. The way communities respond to disturbances can depend on various factors, such as number of species, structural characteristics of the community, stability properties, species characteristics and the nature of the disturbance. READ MORE

5. 3. Interaction strength and keystone species in model food webs

   Author : Maria Christianou; Linköpings universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; interaction strength; keystone species; keystone links; permanence; resilience; local stability; Lotka-Volterra models; species loss;

   Abstract : Ecological communities are often exposed to different kind of disturbances of varied magnitude. The response to disturbances can be affected by, among other factors, the strength of interactions between species within the community. READ MORE

6. 4. Evolutionary genomics in Corvids : – From single nucleotides to structural variants

   Author : Matthias H. Weissensteiner; Jochen B.W. Wolf; Manfred Grabherr; Kateryna M. Makova; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; evolutionary genetics; genomics; population genetics; selection; recombination; chromosomal features; colouration; insertion; deletion; inversion; crow; tandem repeat; transposable element; gene expression;

   Abstract : Heritable genetic variation is the raw material of evolution and can occur in many different forms, from altering single nucleotides to rearranging stretches of millions at once. DNA mutations that result in phenotypic differences are the basis upon which natural selection can act, leading to a shift of the frequency of those mutations. READ MORE

7. 5. Variation in length of proteins by repeats and disorder regions

   Author : Rauan Sagit; Arne Elofsson; Andrey Kajava; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; protein length; repeats; domain repeats; protein evolution; duplication; tandem duplication; intrinsic disorder; intrinsically disordered; variation in length; insertion; deletion; recombination; expansion; contraction; Biochemistry; biokemi;

   Abstract : Protein-coding genes evolve together with their genome and acquire changes, some of which affect the length of their protein products. This explains why equivalent proteins from different species can exhibit length differences. READ MORE