Sökning: "juvenile downstream migration"

Hittade 2 uppsatser innehållade orden juvenile downstream migration.

1. 1. Smoltification status of Atlantic salmon (Salmo salar) in relation to migratory success and migration speed in a regulated river

   Master-uppsats, Karlstads universitet

   Författare :Johanna Högvall; [2020]
   Nyckelord :Atlantic salmon; juvenile downstream migration; parr-smolt transformation; regulated rivers; dams; migration delay; radio-telemetry; Atlantlax; vandringshinder; smoltifieringsgrad; reglerade älvar; radiotelemetri;

   Sammanfattning : There is a concern that the ecosystems around the world are suffering from fragmentation. Ecosystems such as rivers have lost their connectivity to a large extent due to hydroelectric dams with no or insufficient passways for the natural flow of organisms, matter and energy. LÄS MER

3. 2. Consequences on population dynamics following regained connectivity in pike (Esox lucius) spawning location

   Master-uppsats, Linnéuniversitetet/Institutionen för biologi och miljö (BOM)

   Författare :Oscar Adolfsson; [2020]
   Nyckelord :dmixture; emigration; downstream spawning; pike-factory; restoration; sourcesink dynamics; spawning strategy;

   Sammanfattning : Distributional movements of subpopulations may act as a buffer to prevent the loss of a species in a certain area. However, within subpopulations adaptations may evolve that makes the inhabitants of a certain habitat to better cope with prevailing environmental conditions. LÄS MER