Sökning: "body size"

Visar resultat 1 - 5 av 552 avhandlingar innehållade orden body size.

1. 1. Body Size Evolution in Butterflies

   Författare :David Berger; Karl Gotthard; Wolf Blanckenhorn; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Body size evolution; age- and size at maturity; life history theory; fecundity; predation risk; juvenile growth rate; Lepidoptera; Biology; Biologi; zoologisk ekologi; Animal Ecology;

   Sammanfattning : Life history research deals with the scheme of resource partitioning to a wide spectra of processes and the trade-offs shaping these events. One of the most fundamental life history trade-offs is the one of at which age- and size an organism should start to reproduce; reaching a large size at maturity is often advantageous in terms of high adult survival and reproductive potential, while to attain a larger size the organisms must prolong juvenile development which is assumed costly in terms of mortality. LÄS MER

3. 2. Micro- and macroevolutionary aspects of body size diversification and thermal adaptation in insects

   Författare :John Waller; Evolutionär ekologi; []
   Nyckelord :Evolution; body size; Insects; dragonflies; damselflies; Odonata; Comparative methods; fossils;

   Sammanfattning : Body size and body temperature are the two most important traits in biology. In this thesis I show how these twovariables have shaped the evolution of insects over the last 300 million years. LÄS MER

4. 3. Why and how brain size evolves : Sociality, predation and allometry

   Författare :Wouter van der Bijl; Niclas Kolm; Joah Madden; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; brain size; brain size evolution; encephalization; predation; predator inspection; sociality; animal contest; constraint; etologi; Ethology;

   Sammanfattning : The evolution of the vertebrate brain has remained a topic of intense interest from biologists over many decades. Evolutionary biologists have seen it as an intriguing example of how the size and structure of a trait evolves across large phylogenies and under body size constraints, with both large shifts in deep evolutionary time and continuous smaller scale adaptation. LÄS MER

5. 4. Survival of the Tamest : The Domesticated Phenotype in Red Junglefowl Selected for Tameness

   Författare :Rebecca Katajamaa; Per Jensen; Dominic Wright; Ruth C. Newberry; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; domestication; chicken; red junglefowl; tameness; brain size; behaviour; cognition; body size;

   Sammanfattning : Early animal domestication was probably associated with reduced fear of humans. Domestication is a process in which animals adapt to humans and the captive environment provided by humans. Selection on tameness as the only trait has previously been found to generate changes in other phenotypes in different animal species. LÄS MER

7. 5. Body weight, body size and early cardiovascular disease. Epidemiological studies using Swedish registries

   Författare :Christina Lundberg; Göteborgs universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; epidemiology; body mass index; obesity; bariatric surgery; gastric bypass; cardiovascular disease; mortality;

   Sammanfattning : Background: Obesity is a known risk factor for cardiovascular morbidity and mortality, as well as for atrial fibrillation and heart failure. While overweight and obesity have become increasingly more common in Sweden and worldwide during the past decades, there have also been an increase of some cardiovascular diseases (CVD) among men and women younger than 45 years old in Sweden. LÄS MER