Disputas: Jean-Marc Costanzi

Jean-Marc Costanzi har til forsvar for graden philosophiae doctor (ph.d.) ved Fakultet for teknologi, naturvitenskap og maritime fag (TNM), innlevert avhandling med tittelen; “Habitat isolation in an alpine landscape: effects on population genetics and adult sex ratios in the rock ptarmigan Lagopus muta”.


28 Feb

Praktisk informasjon

  • Dato: 28. februar 2019
  • Tid: kl. 00.15 - 16.00
  • Sted: Campus Bø, Auditorium 5-115
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    Til å bedømme avhandlingen er oppnevnt:

    • Forsker Dr. Sara Oyler-McCance, the U.S. Geological Survey at the Fort Collins Science Center
    • Seniorforsker Erlend Birkeland Nilsen, Norsk institutt for naturforskning

     

    Administrator:

    Professor Jan Heggenes, USN

    Veiledere:

    Hovedveileder for doktorgradsarbeidet har vært Førsteamanuensis Øyvind Steifetten, USN, og biveiledere har vært Førsteamanuensis Mona Sæbø, USN.

    Program:

    Prøveforelesningen vil bli holdt i Auditorium 5-115 ved USN i Bø, torsdag 28. feb 2019, kl.11.00 over emnet:

    “The importance of confirmatory vs exploratory research in ecology and conservation”

    Disputas avholdes samme sted, 5-115 torsdag 28. feb 2019, kl.12.15  

    Prøveforelesning og disputas er åpen for alle interesserte.

Om avhandlingen:

I studied the effect of habitat isolation on the rock ptarmigan (Lagopus muta) in southern Norway and Sweden, with special emphasis on genetic diversity, adult sex ratio and population structure.

I found that genetic diversity was negatively affected by isolation and habitat size, and that isolated populations had a male-biased sex ratio. Although the rock ptarmigan is able of flying long distances, they do not seem to cross large stretches of unsuitable habitat. I also found that the presence of ski resorts increased the effect of isolation for small mountain fragments.

My work show that habitat isolation has an adverse effect on the genetics and dynamics of the rock ptarmigan, and that isolated populations are more likely to be negatively affected by changes in their habitat than large contiguous populations.

 

Jean-Marc Costanzi