Blar i forfatter "Aspholm, Paul Eric"

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    • Future changes in the supply of goods and services from natural ecosystems: prospects for the European north 

      Jansson, Roland; Nilsson, Christer; Keskitalo, E. Carina H.; Viasova, Tatiana; Sutinen, Marja-Liisa; Moen, Jon; Chapin, Stuart; Bråthen, Kari Anne; Cabeza, Mar; Callaghan, Terry V.; van Oort, Bob; Dannevig, Halvor; Bay-Larsen, Ingrid Agathe; Ims, Rolf Anker; Aspholm, Paul Eric (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-09)
      Humans depend on services provided by ecosystems, and how services are affected by climate change is increasingly studied. Few studies, however, address changes likely to affect services from seminatural ecosystems. We analyzed ecosystem goods and services in natural and seminatural systems, specifically how they are expected to change as a result of projected climate change during the 21st ...

    • Genetic changes caused by restocking and hydroelectric dams in demographically bottlenecked brown trout in a transnational subarctic riverine system 

      Klutsch, Cornelya; Maduna, Simo; Polikarpova, Natalia; Forfang, Kristin; Aspholm, Paul Eric; Nyman, Tommi; Eiken, Hans Geir; Amundsen, Per-Arne; Hagen, Snorre (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-04-29)
      Habitat discontinuity, anthropogenic disturbance, and overharvesting have led to population fragmentation and decline worldwide. Preservation of remaining natural genetic diversity is crucial to avoid continued genetic erosion. Brown trout (<i>Salmo trutta</i> L.) is an ideal model species for studying anthropogenic influences on genetic integrity, as it has experienced significant genetic alterations ...

    • Prey consumption rates and growth of piscivorous brown trout in a subarctic watercourse 

      Jensen, Hallvard; Amundsen, Per-Arne; Elliott, J. Malcolm; Bøhn, Thomas; Aspholm, Paul Eric (Journal article; Tidsskriftartikkel; Peer reviewed, 2006-02-28)
      Prey consumption rates of piscivorous brown trout <i>Salmo trutta</i> were studied in the Pasvik watercourse, which forms the border between Norway and Russia. Estimates of food consumption in the field were similar to or slightly less than maximum values from a bioenergetic model. The piscivore diet consisted mainly of vendace <i>Coregonus albula</i> with a smaller number of whitefish <i>Coregonus ...

    • Studying phenological phenomena in subarctic biomes with international school pupils as citizen scientists 

      Klutsch, Cornelya; Aspholm, Paul Eric; Polikarpova, Natalia; Veisblium, Olga; Bjørn, Tor-Arne; Wikan, Anne; Gonzalez, Victoria; Hagen, Snorre B. (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-12-30)
      Citizen science can facilitate in‐depth learning for pupils and students, contribute to scientific research, and permit civic participation. Here, we describe the development of the transnational school‐based citizen science project <i>Phenology of the North Calotte</i>. Its primary goal is to introduce pupils (age 12–15; grades 7–10) in northern Norway, Russia, and Finland to the local and global ...

    • Temporal analysis shows relaxed genetic erosion following improved stocking practices in a subarctic transnational brown trout population 

      Klutsch, Cornelya; Maduna, Simo; Polikarpova, Natalia; Forfang, Kristin; Beddari, Benedicte Lissner; Gjelland, Karl Øystein; Aspholm, Paul Eric; Amundsen, Per-Arne; Hagen, Snorre (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-08-30)
      Maintaining standing genetic variation is a challenge in human-dominated landscapes. We used genetic (i.e., 16 short tandem repeats) and morphological (i.e., length and weight) measurements of 593 contemporary and historical brown trout (Salmo trutta) samples to study fine-scale and short-term impacts of different management practices. These had changed from traditional breeding practices, using the ...