• Background invertebrate herbivory on dwarf birch (Betula glandulosa-nana complex) increases with temperature and precipitation across the tundra biome 

      Barrio, Isabel C.; Lindén, Elin; te Beest, Mariska; Olofsson, Johan; Rocha, Adrian; Soininen, Eeva M; Alatalo, Juha M.; Andersson, Tommi; Asmus, Ashley; Boike, Julia; Bråthen, Kari Anne; Bryant, John P.; Buchwal, Agata; Bueno, C. Guillermo; Christie, Katherine S.; Denisova, Yulia V.; Egelkraut, Dagmar; Ehrich, Dorothee; Fishback, LeeAnn; Forbes, Bruce C.; Gartzia, Maite; Grogan, Paul; Hallinger, Martin; Heijmans, Monicque M.P.D.; Hik, David S.; Hofgaard, Annika; Holmgren, Milena; Høye, Toke T.; Huebner, Diane C.; Jonsdottir, Ingibjørg; Kaarlejärvi, Elina; Kumpula, Timo; Lange, Cynthia Y.M.J.G.; Lange, Jelena; Lévesque, Esther; Limpens, Juul; Macias-Fauria, Marc; Myers-Smith, Isla; Van Nieukerken, Erik J.; Normand, Signe; Post, Eric S.; Schmidt, Niels Martin; Sitters, Judith; Skoracka, Anna; Sokolov, Alexander; Sokolova, Natalya; Speed, James David Mervyn; Street, Lorna E.; Sundqvist, Maja K.; Suominen, Otso; Tananaev, Nikita; Tremblay, Jean-Pierre; Urbanowicz, Christine; Uvarov, Sergey A.; Watts, David; Wilmking, Martin; Wookey, Philip A.; Zimmermann, Heike H.; Zverev, Vitali; Kozlov, Mikhail V. (Journal article; Peer reviewed, 2017)
      Chronic, low intensity herbivory by invertebrates, termed background herbivory, has been understudied in tundra, yet its impacts are likely to increase in a warmer Arctic. The magnitude of these changes is however hard to ...
    • Biding time before breeding: flexible use of the Arctic landscape by migratory geese during spring 

      Anderson, Helen; Hübner, Christiane E.; Speed, James David Mervyn; Madsen, Jesper; van der Wal, René (Journal article; Peer reviewed, 2015)
      Many millions of long-distance migrants use pre-breeding staging sites located adjacent to breeding grounds immediately prior to nesting, presumably to improve body condition and thus reproductive success. However, in ...
    • Can mowing restore boreal rich-fen vegetation in the face of climate change? 

      Ross, Louise C.; Speed, James David Mervyn; Øien, Dag-Inge; Grygoruk, Mateusz; Hassel, Kristian; Lyngstad, Anders; Moen, Asbjørn (Journal article; Peer reviewed, 2019)
      Low-frequency mowing has been proposed to be an effective strategy for the restoration and management of boreal fens after abandonment of traditional haymaking. This study investigates how mowing affects long-term vegetation ...
    • Cervid Exclusion Alters Boreal Forest Properties with Little Cascading Impacts on Soils 

      Kolstad, Anders Lorentzen; Speed, James David Mervyn; Austrheim, Gunnar; Solberg, Erling Johan; Woodin, Sarah J.; Venete, Aurel M A (Journal article; Peer reviewed, 2017)
      Large herbivores are capable of modifying entire ecosystems with a combination of direct (for example browsing/grazing, trampling, defecation) and indirect (for example affecting plant species composition that then alters ...
    • Contrasting spatial, temporal and environmental patterns in observation and specimen based species occurrence data 

      Speed, James David Mervyn; Bendiksby, Mika; Finstad, Anders Gravbrøt; Hassel, Kristian; Kolstad, Anders Lorentzen; Prestø, Tommy (Journal article; Peer reviewed, 2018)
      Species occurrence data records the location and time of an encounter with a species, and is valuable for many aspects of ecological and evolutionary analyses. A key distinction within species occurrence data is between ...
    • Contrasting spatial, temporal and environmental patterns in observation and specimen based species occurrence data 

      Speed, James David Mervyn; Bendiksby, Mika; Finstad, Anders Gravbrøt; Hassel, Kristian; Kolstad, Anders Lorentzen; Prestø, Tommy (Journal article; Peer reviewed, 2018)
      Species occurrence data records the location and time of an encounter with a species, and is valuable for many aspects of ecological and evolutionary analyses. A key distinction within species occurrence data is between ...
    • Cool as a moose: How can browsing counteract climate warming effects across boreal forest ecosystems? 

      Vuorinen, Katariina; Kolstad, Anders Lorentzen; De Vriendt, Laurent; Austrheim, Gunnar; Jean-Pierre, Tremblay; Solberg, Erling Johan; Speed, James David Mervyn (Peer reviewed; Journal article, 2020)
      Herbivory has potential to modify vegetation responses to climatic changes. However, climate and herbivory also affect each other, and rarely work in isolation from other ecological factors, such as plant–plant competition. ...
    • Differential patterns of floristic phylogenetic diversity across a post-glacial landscape 

      Mienna, Ida M.; Speed, James David Mervyn; Bendiksby, Mika; Thornhill, Andrew H.; Mishler, Brent D; Martin, Michael David (Journal article; Peer reviewed, 2019)
      Aim: In this study, we explored spatial patterns of phylogenetic diversity (PD) and end-emism in the flora of Norway and tested hypothesized post-glacial environmental drivers of PD, including temperature, precipitation, ...
    • Effects of hydropeaking on benthic invertebrate community composition in two central Norwegian rivers 

      Kjærstad, Gaute; Arnekleiv, Jo Vegar; Speed, James David Mervyn; Herland, Anne Karine (Journal article; Peer reviewed, 2018)
      Hydropower regulations can have dramatic impacts on river ecological communities. The operation of hydropower stations is related to power demands, but their releases in the receiving water body causes sudden changes in ...
    • Evidence of effects of herbivory on Arctic vegetation: a systematic map protocol 

      Soininen, Eeva M; Barrio, I.; Jepsen, Jane Uhd; Ehrich, Dorothee; Ravolainen, Virve; Speed, James David Mervyn (Journal article; Peer reviewed, 2018)
      Background: Along with climate change, herbivory is considered a main driver of ecosystem change in terrestrial Arctic environments. Understanding how herbivory influences the resilience of Arctic ecosystems to ongoing ...
    • Experimental effects of herbivore density on above-ground plant biomass in an alpine grassland ecosystem 

      Austrheim, Gunnar; Speed, James David Mervyn; Martinsen, Vegard; Mulder, Jan; Mysterud, Atle (Journal article; Peer reviewed, 2014)
      Herbivores may increase or decrease aboveground plant productivity depending on factors such as herbivore density and habitat productivity. The grazing optimization hypothesis predicts a peak in plant production at ...
    • Herbivory and climate as drivers of woody plant growth: Do deer decrease the impacts of warming? 

      Vuorinen, Katariina; Rao, Shaila; Hester, Alison J.; Speed, James David Mervyn (Peer reviewed; Journal article, 2020)
      Vegetation at ecotone transitions between open and forested areas is often heavily affected by two key processes: climate change and management of large herbivore densities. These both drive woody plant state shifts, ...
    • Hiding in the background: community-level patterns in invertebrate herbivory across the tundra biome 

      Rheubottom, Sarah I.; Barrio, Isabel C.; Kozlov, Mikhail V.; Alatalo, Juha M.; Andersson, Tommi; Asmus, Ashley L.; Baubin, Capucine; Brearley, Francis Q.; Egelkraut, Dagmar; Ehrich, Dorothee; Gauthier, Gilles; Jonsdottir, Ingibjørg; Konieczka, Sophia; Lévesque, Esther; Olofsson, Johan; Prevéy, Janet S.; Slevan-Tremblay, Guillaume; Sokolov, Aleksandr; Sokolova, Natalia; Sokovnina, Svetlana; Speed, James David Mervyn; Suominen, Otso; Zverev, Vitali; Hik, David S. (Journal article; Peer reviewed, 2019)
      Invertebrate herbivores depend on external temperature for growth and metabolism. Continued warming in tundra ecosystems is proposed to result in increased invertebrate herbivory. However, empirical data about how current ...
    • Hiding in the background: community-level patterns in invertebrate herbivory across the tundra biome 

      Rheubottom, Sarah I.; Barrio, Isabel C.; Kozlov, Mikhail V.; Alatalo, Juha M.; Andersson, Tommi; Asmus, Ashley L.; Baubin, Capucine; Brearley, Francis Q.; Egelkraut, Dagmar; Ehrich, Dorothee; Gauthier, Gilles; Jonsdottir, Ingibjørg; Konieczka, Sophia; Lévesque, Esther; Olofsson, Johan; Prevéy, Janet S.; Slevan-Tremblay, Guillaume; Sokolov, Aleksandr; Sokolova, Natalia; Sokovnina, Svetlana; Speed, James David Mervyn; Suominen, Otso; Zverev, Vitali; Hik, David S. (Journal article; Peer reviewed, 2019)
      Invertebrate herbivores depend on external temperature for growth and metabolism. Continued warming in tundra ecosys-tems is proposed to result in increased invertebrate herbivory. However, empirical data about how current ...
    • How does microclimate affect the growth of the rare liverwort Scapania nimbosa? 

      Wangen, Kristin; Speed, James David Mervyn; Hassel, Kristian (Journal article; Peer reviewed, 2017)
      Vegetative growth of bryophytes is dependent on water and will stop as soon as the plants dry out. The growth rate depends on the quality of the micro-habitat. Clonal growth and dispersal of plant fragments are important ...
    • Hyper-oceanic liverwort species of conservation concern: Evidence for dispersal limitation and identification of suitable uncolonised regions 

      Wangen, Kristin; Speed, James David Mervyn; Hassel, Kristian (Journal article; Peer reviewed, 2016)
      In order to successfully manage and conserve species and plant communities, it is important to have a good understanding of their ecology and distributions. The three liverwort species Anastrophyllum donnianum, Scapania ...
    • Impact of an invasive alien plant on litter decomposition along a latitudinal gradient 

      Helsen, Kenny; Smith, Stuart; Brunet, J; Cousins, Sara A.O.; De Frenne, Pieter; Kimberley, Adam; Kolb, Annette; Lenoir, Jonathan; Ma, Shiyu; Michaelis, Jana; Pule, Jan; Verheyen, Kris; Speed, James David Mervyn; Graae, Bente Jessen (Journal article; Peer reviewed, 2018)
      Invasive alien plant effects on ecosystem functions are often difficult to predict across environmental gradients due to the context-dependent interactions between the invader and the recipient communities. Adopting a ...
    • Impacts of an invasive plant on primary production: Testing a functional trait-based framework with a greenhouse experiment 

      Helsen, Kenny; Kapás, Rozália Erzsebet; Rakvaag, Grete; Speed, James David Mervyn; Graae, Bente Jessen (Journal article; Peer reviewed, 2018)
      Questions Predicting when invasive species will affect ecosystem functioning remains problematic, with strong contingency upon both the invasive species and the recipient community's identities. Adopting a functional ...
    • Increasing Cervidae populations have variable impacts on habitat suitability for threatened forest plant and lichen species 

      Speed, James David Mervyn; Austrheim, Gunnar; Bendiksby, Mika; Kolstad, Anders Lorentzen; Vuorinen, Katariina (Peer reviewed; Journal article, 2020)
      Large herbivores play a key role in temperate and boreal forest ecosystems. Cervidae (deer) population densities and community structure have undergone drastic changes in many parts of the world over the past decades, often ...
    • Is interspecific gene flow and speciation in peatmosses (Sphagnum) constrained by phylogenetic relationship and life-history traits? 

      Meleshko, Olena; Stenøien, Hans K.; Speed, James David Mervyn; Flatberg, Kjell Ivar; Kyrkjeeide, Magni Olsen; Hassel, Kristian (Journal article; Peer reviewed, 2018)
      Peatmosses are interesting for studies of speciation processes not only because of their frequent hybridization and recent diversification, but also their phenotypic diversity, ecological importance and ancient history. ...