Snorre Hagen
Avdelingsleder/forskningssjef
Forfattere
Runar Kjær David Kniha Andrea Gjestvang Marianne Liplass Svein Wara Victoria Gonzalez Paul Eric Aspholm Tommi Nyman Cornelya Klutsch Snorre HagenSammendrag
Denne studien undersøker effekten av tynningshogst på forekomsten av reinlav i Pasvikdalen, et område der både skogdrift og reindrift er viktige næringer. Resultatene viser at tynningshogst kan fremme en økning i lavforekomsten sammenlignet med ikke-tynnete kontrollområder, men det tar flere år før denne økningen blir signifikant. Lavforekomsten varierer imidlertid betydelig både innen og mellom lokaliteter, noe som sannsynligvis skyldes varierende miljøforhold og kort tidsramme for observasjoner. Studien understreker viktigheten av riktig håndtering av hogstavfall for å minimere negativ innvirkning på skogbunnen. Samling og komprimering av kvist i kjøretraséer fremskynder nedbrytning og reduserer langvarig påvirkning. Det anbefales også at fremtidige studier inkluderer både før- og etter-data for å kunne dokumentere lavens utvikling bedre, samt at langsiktige studier bør se på interaksjonen mellom tynningshogst, lavforekomst og reindrift over tid. Ekskludering av reinbeiting i visse områder kan gi et klarere bilde av effektene fra hogst alene. Samlet sett er tynningshogst en positiv faktor for lavforekomsten i denne studien, men videre forskning er nødvendig for å sikre at skogbruk og reindrift kan sameksistere bærekraftig.
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Rune Andreassen Berit Hansen Liya Pokrovskaya Vladimir Zhakov Daniel Kling Cornelya Klutsch Ida Marie Luna Fløystad Hans Geir Eiken Snorre HagenSammendrag
Despite the high density of brown bears (Ursus arctos piscator) on the Kamchatka peninsula their genetic variation has not been studied by STR analysis. Our aim was, therefore, to provide population data from the Kamchatka brown bear population applying a validated DNA profiling system. Twelve dinucleotide STRs commonly used in Western-European (WE) populations and four additional ones (G10C, G10J, G10O, G10X), were included. Template input ≥ 0.2 ng was successfully amplified. Measurements of precision, stutter and heterozygous balance showed that markers could be reliably genotyped applying the thresholds used for genotyping WE brown bears. However, locus G10X revealed an ancient allele-specific polymorphism that led to suboptimal amplification of all 174 bp alleles (Kamchatka and WE). Allele frequency estimates and forensic genetic parameters were obtained from 115 individuals successfully identified by genotyping 434 hair samples. All markers met the Hardy-Weinberg and linkage equilibrium expectations, and the power of discrimination ranged from 0.667 to 0.962. The total average probability of identity from the 15 STRs was 1.4 ×10−14 (FST = 0.05) while the total average probability of sibling identity was 6.0 ×10−6. Relationship tests revealed several parent-cub and full sibling pairs demonstrating that the marker set would be valuable for the study of family structures. The population data is the first of its kind from the Kamchatka brown bear population. Population pairwise FST`s revealed moderate genetic differentiation that mirrored the geographic distances to WE populations. The DNA profiling system, providing individual-specific profiles from non-invasive samples, will be useful for future monitoring and conservation purposes
Divisjon for miljø og naturressurser
Interreg-Aurora project: Our Precious Transboundary Waters
The brown trout is a socioeconomically important freshwater fish in both Norway and Finland, where habitat fragmentation, overexploitation, translocations, and stocking have led to nationwide decline especially in populations of large growing, adfluvial brown trout and their genetic integrity. Careful conservation and coordinated, sustainable management of the remaining large growing brown trout populations is crucial. For this purpose, our project focuses on the transboundary Lake Inari-Pasvik River catchment as a bilateral model (reference) system, utilizing and requiring cross-border cooperation between Norway and Finland. We combine information on the genetic status of trout populations in the catchment, introduce new research methods and compare existing stocking programs for providing tools and guidelines to support the knowledge-based conservation and management of adfluvial brown trout populations in Norway and Finland.
