Sökning: "otolit"

Hittade 2 uppsatser innehållade ordet otolit.

1. 1. Utvärdering av rörelsemönster hos öring (Salmo trutta) utifrån otolitmikrokemi

   Magister-uppsats, Karlstads universitet/Fakulteten för hälsa, natur- och teknikvetenskap (from 2013)

   Författare :Magdalena Andersson; [2014]
   Nyckelord :öring; otolit; migration; mikrokemi;

   Sammanfattning : The classic view of trout (Salmo trutta) life history is that trout begins its life in freshwater, migrates to the ocean after about 1-4 years and then returns to freshwater to spawn. As trout fry have been caught at the mouth of the River Emån, near the Baltic Sea, researchers have speculated that some trout emigrate during their first year of life. LÄS MER

3. 2. Födosammansättning hos gråsäl (Halichoerus grypus) samt test av flotte för insamling av sälfekalier.

   Magister-uppsats, Naturvetenskapliga institutionen

   Författare :Christian Lagström; [2008]
   Nyckelord :grey seal; food preferences; ecosystem; Baltic Sea; otoliths; floating platform; scats; cormorants;

   Sammanfattning : During the 1960´s and 1970´s the number of grey seals in the Baltic Sea was decreasing rapidly, mostly due to hunting and toxic substances like DDT and PCB. When hunting became less intense and toxic substances decreased in the environment the grey seal population started to increase. LÄS MER