Sökning: "European whitefish"

Visar resultat 6 - 10 av 13 uppsatser innehållade orden European whitefish.

1. 6. Predation as a driver of reproductive isolation : Differences in predation risk between whitefish (Coregonus lavaretus) spawning habitats

   Master-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

   Författare :Benjamin Lindberg; [2021]
   Nyckelord :Coregonus lavaretus; reproductive isolation; predation; spawning habitat; spawning time;

   Sammanfattning : The origin and maintenance of much of natural biodiversity can likely be explained by theecological speciation theory. Ecological speciation is defined as the process whenreproductive isolation arises through divergent selection caused by ecological factors, such asbiotic interactions and abiotic conditions. LÄS MER

3. 7. Temporal spawning divergence in European whitefish (Coregonus lavaretus) : The first steps towards reproductive isolation in young populations (70-171 years)

   Master-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

   Författare :Petter Johansson; [2017]
   Nyckelord :Population divergence; Coregonus lavaretus; spawning whitefish; reproductive isolation; young populations;

   Sammanfattning : A critical step in ecological speciation is the development of reproductive isolation. The processes leading up to reproductive isolation are difficult to study since they often occur over very long time periods. LÄS MER

4. 8. The road toward sympatric speciation in whitefish. : The effects of divergent selection on European whitefish (Coregonus lavaretus) size and behavior, and effects on zooplankton communities.

   Master-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

   Författare :William Hatchett; [2015]
   Nyckelord :sympatric speciation; selection pressures; divergence; speciation;

   Sammanfattning : For almost every organism there are large gaps in our knowledge about the processes that leads to speciation. The changes an organism undergoes before divergence has occurred have remained a mystery, as it is difficult to say whether or not a species is going to diverge and when. LÄS MER

5. 9. Method Improvement for the Determination and Quantification of PCBs in the Muscle Tissues of Arctic Char (Salvelinus salvelinus) and European Whitefish (Coregonus acronius) from Lake Vättern, Sweden

   Kandidat-uppsats, Örebro universitet/Institutionen för naturvetenskap och teknik

   Författare :Melli Sejfic; [2015]
   Nyckelord :PCBs; Arctic char; European whitefish; Lake Vättern; sample pretreatment; silica;

   Sammanfattning : Lake Vättern has been contaminated with high levels of polychlorinated biphenyls (PCBs) for decades, which could be due to the release of wastes from industries and urban communities surrounding the water system. This has especially had a negative effect on fatty fishes, which could accumulate large amounts of persistent organic pollutants (POPs) and thereby also become a source of environmental toxicants to humans through consumption. LÄS MER

7. 10. Adaptive trait utility in the feeding apparatus of European whitefish (Coregonus lavaretus) : Relationships between feeding morphology and maximum and minimum prey size in the diet of whitefish

   Master-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

   Författare :Emma Andersson; [2015]
   Nyckelord :trait utility; gill rakers; adaptive radiation; morphological adaptation; feeding niche;

   Sammanfattning : Whitefish (Coregonus lavaretus) populations diverge into morphs that differ in body size along a benthic-limnetic axis and throughout the depth of the water column. This process is assumedly initiated by the presence of northern pike (Esox lucius) and is followed by morphological adaptations to available food resources. LÄS MER