Sökning: "European whitefish"

Visar resultat 11 - 13 av 13 uppsatser innehållade orden European whitefish.

1. 11. Size selective predation of pike on whitefish : The effects on resource polymorphism in Scandinavian whitefish populations

   Kandidat-uppsats, Institutionen för ekologi, miljö och geovetenskap

   Författare :Johan Fahlman; [2014]
   Nyckelord :pike; whitefish; predation; resource polymorphism; divergence;

   Sammanfattning : The mechanisms behind speciation have been subject of debate for centuries. The presence of resource polymorphism has been discovered to play a significant part in this process, and has been proven to induce phenotypic and genetic divergence. LÄS MER

3. 12. Growth of whitefish ecotypes : A comparison of individual growth rates in monomorphic and polymorphic populations

   Kandidat-uppsats, Institutionen för ekologi, miljö och geovetenskap

   Författare :Fredrik Olajos; [2013]
   Nyckelord :whitefish; growth rate; scales; pike; polymorphism;

   Sammanfattning : In resource polymorphism, ecological opportunity and selective predatory pressure can be considered key factors in phenotypic divergence. In post-glacial lakes of Scandinavia, the European whitefish (Coregonus lavaretus L.) is a common species and has repeatedly diverged along the benthic - pelagic resource axis. LÄS MER

4. 13. Analys av åldersstrukturen hos sik (Coregonus lavaretus) i sjöar utan gädda (Esox lucius)

   Kandidat-uppsats, Institutionen för ekologi, miljö och geovetenskap

   Författare :Martina Magnusson; [2012]
   Nyckelord :Whitefish; Sympatric speciation; Age analysis; Otoliths;

   Sammanfattning : Development of morphs within European whitefish (Coregonus lavaretus), might be considered as a beginning of a sympatric speciation process. Unpublished data suggests that presence of the keystone piscivore northern pike (Esox lucius) is the main driver of sympatric divergence in European whitefish (Coregonus lavaretus). LÄS MER