Sökning: "David Berger"

Visar resultat 1 - 5 av 6 avhandlingar innehållade orden David Berger.

1. 1. Stabilizing selection on body size in butterflies

   Författare :David Berger; Stockholms universitet; []
   Nyckelord :;

   Sammanfattning : .... LÄS MER

3. 2. 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

4. 3. Condition dependent germline maintenance in seed beetles

   Författare :Julian Baur; David Berger; Simone Immler; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : The aim of the work presented in this thesis is to investigate how costly adaptations promoted by sexual selection affect fertility and offspring quality through changes in germline maintenance. Germline maintenance, comprising mechanisms maintaining DNA-integrity and homeostasis within germ cells, is known to be costly and, therefore, may trade-off with other costly reproductive traits that are under sexual selection. LÄS MER

5. 4. Sexual conflict, sexual selection, and genetic variance in fitness

   Författare :Karl Grieshop; Göran Arnqvist; David Berger; Jacek Radwan; Uppsala universitet; []
   Nyckelord :Biologi med inriktning mot zooekologi; Biology with specialization in Animal Ecology;

   Sammanfattning : Understanding sex-specific genetic variance for fitness is of fundamental importance to our understanding of evolution. This thesis presents the findings of empirical investigations into sex-specific genetic variance in fitness. LÄS MER

7. 5. Sexual Selection and Adaptation to Novel Environments

   Författare :Ivain Martinossi-Allibert; David Berger; Göran Arnqvist; Lukas Schärer; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Sexual selection; Environmental change; Sexual conflict; Environmental stress; Adaptation; Adaptive landscape; Biologi med inriktning mot zooekologi; Biology with specialization in Animal Ecology;

   Sammanfattning : The work included in this thesis aims at exploring the environmental sensitivity of benefits and costs of sexual selection through a combined empirical and theoretical effort, to increase our understanding of the impact of environmental change on sexually reproducing populations.Can sexual selection promote adaptation to novel environments? Sexual selection for good genes should accelerate adaptation by granting higher reproductive success to individuals of high genetic quality. LÄS MER