Blar i NTNU Open på forfatter "Opedal, Øystein Hjorthol"
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Determinants of tree seedling establishment in alpine tundra
Marsman, Floor; Nystuen, Kristin Odden; Opedal, Øystein Hjorthol; Sørensen, Mia Vedel; De Frenne, Pieter; Graae, Bente Jessen; Limpens, Juul; Foest, Jessie (Peer reviewed; Journal article, 2020)Questions Changes in climate and herbivory pressure affect northern alpine ecosystems through woody plant encroachment, altering their composition, structure and functioning. The encroachment often occurs at unequal rates ... -
Evolvability and trait function predict phenotypic divergence of plant populations
Opedal, Øystein Hjorthol; Armbruster, Scott; Hansen, Thomas Fredrik; Holstad, Agnes; Pelabon, Christophe; Andersson, Stefan; Campbell, Diane R.; Caruso, Christina M.; Delph, Lynda F.; Eckert, Christopher G.; Lankinen, Åsa; Walter, Greg M.; Ågren, Jon; Bolstad, Geir Hysing (Peer reviewed; Journal article, 2023)Understanding the causes and limits of population divergence in phenotypic traits is a fundamental aim of evolutionary biology, with the potential to yield predictions of adaptation to environmental change. Reciprocal ... -
Fitness costs of delayed pollination in a mixed-mating plant
Hildesheim, Laura; Opedal, Øystein Hjorthol; Armbruster, Scott; Pelabon, Christophe (Journal article; Peer reviewed, 2019)Background and Aims To predict the evolutionary consequences of pollinator declines, we need to understand the evolution of delayed autonomous self-pollination, which is expected to evolve as a mechanism of reproductive ... -
Habitat area and local habitat conditions outweigh fragmentation effects on insect communities in vineyards
Bosco, Laura; Moser, Valentin; Jones, Mirkka M.; Opedal, Øystein Hjorthol; Ovaskainen, Otso Tapio; Sonja, Gerber; Van Klink, Roel; Cushman, Samuel A.; Arlettaz, Raphaël; Jacot, Alain (Peer reviewed; Journal article, 2023)Fragmentation of habitat, for example by intensive agricultural practices, can be detrimental to local biodiversity. However, it often remains unclear whether such biodiversity declines are caused by loss of habitat area ... -
Herkogamy, a principal functional trait of plant reproductive biology
Opedal, Øystein Hjorthol (Journal article; Peer reviewed, 2018)Premise of research. Phenotypic traits that consistently mediate species’ responses to environmental variation (functional traits) provide a promising approach toward generalizing ecological and evolutionary patterns and ... -
Inbreeding effects in a mixed-mating vine: Effects of mating history, pollen competition and stress on the cost of inbreeding
Opedal, Øystein Hjorthol; Armbruster, William Scott; Pelabon, Christophe (Journal article; Peer reviewed, 2015)Inbreeding depression is assumed to be a central factor contributing to the stability of plant mating systems. Predicting the fitness consequence of inbreeding in natural populations is complicated, however, because it may ... -
Intersexual conflict over seed size is stronger in more outcrossed populations of a mixed-mating plant
Raunsgard, Astrid; Opedal, Øystein Hjorthol; Ekrem, Runa K; Wright, Jonathan; Bolstad, Geir Hysing; Armbruster, William Scott; Pelabon, Christophe (Journal article; Peer reviewed, 2018)In polyandrous species, fathers benefit from attracting greater maternal investment toward their offspring at the expense of the offspring of other males, while mothers should usually allocate resources equally among ... -
Lichens facilitate seedling recruitment in alpine heath
Nystuen, Kristin Odden; Sundsdal, Kristine; Opedal, Øystein Hjorthol; Holien, Håkon; Strimbeck, Richard; Graae, Bente Jessen (Peer reviewed; Journal article, 2019)Questions How do mat thickness, physical structure and allelopathic properties of terricolous mat‐forming lichens affect recruitment of vascular plants in dwarf‐shrub and lichen heath vegetation? Location The mountains of ... -
No evidence that seed predators constrain pollinator-mediated trait evolution in a tropical vine
Opedal, Øystein Hjorthol; Albertsen, Elena; Perez-Barrales, Rocio; Armbruster, W.Scott; Pelabon, Christophe (Journal article; Peer reviewed, 2019)Turnover in biotic communities across heterogeneous landscapes is expected to lead to variation in interactions among plants, their mutualists, and their antagonists. Across a fragmented landscape in northern Costa Rica, ... -
Quantitative and qualitative consequences of reduced pollen loads in a mixed-mating plant
Hildesheim, Laura; Opedal, Øystein Hjorthol; Armbruster, Scott; Pelabon, Christophe (Journal article; Peer reviewed, 2019)Greater pollination intensity can enhance maternal plant fitness by increasing seed set and seed quality as a result of more intense pollen competition or enhanced genetic sampling. We tested experimentally these effects ... -
Quantitative and qualitative consequences of reduced pollen loads in a mixed-mating plant
Hildesheim, Laura; Opedal, Øystein Hjorthol; Armbruster, Scott; Pelabon, Christophe (Journal article; Peer reviewed, 2019)Greater pollination intensity can enhance maternal plant fitness by increasing seed set and seed quality as a result of more intense pollen competition or enhanced genetic sampling. We tested experimentally these effects ... -
Rainfall seasonality predicts the germination behaviour of a tropical dry-forest vine
Martins, Adriana A.; Opedal, Øystein Hjorthol; Armbruster, William Scott; Pelabon, Christophe (Journal article; Peer reviewed, 2019)Seed dormancy is considered to be an adaptive strategy in seasonal and/or unpredictable environments because it prevents germination during climatically favorable periods that are too short for seedling establishment. ... -
Rainfall seasonality predicts the germination behaviour of a tropical dry-forest vine
Martins, Adriana A.; Opedal, Øystein Hjorthol; Armbruster, William Scott; Pelabon, Christophe (Journal article; Peer reviewed, 2019)Seed dormancy is considered to be an adaptive strategy in seasonal and/or unpredictable environments because it prevents germination during climatically favorable periods that are too short for seedling establishment. ... -
Stay or go – how topographic complexity influences alpine plant population and community responses to climate change
Graae, Bente Jessen; Vandvik, Vigdis; Armbruster, W. Scott; Eiserhardt, Wolf L.; Svenning, Jens-Christian; Hylander, Kristoffer; Ehrlén, Johan; Speed, James D.M.; Klanderud, Kari; Bråthen, Kari Anne; Milbau, Ann; Opedal, Øystein Hjorthol; Alsos, Inger G.; Ejrnæs, Rasmus; Bruun, Hans Henrik; Birks, H. John B.; Westergaard, Kristine Bakke; Birks, Hilary H; Lenoir, Jonathan (Journal article; Peer reviewed, 2017)In the face of climate change, populations have two survival options − they can remain in situ and tolerate the new climatic conditions (“stay”), or they can move to track their climatic niches (“go”). For sessile and ... -
The Evolution of Herkogamy: Pollinator Reliability, Natural Selection, and Trait Evolvability
Opedal, Øystein Hjorthol (Doctoral theses at NTNU;2017:68, Doctoral thesis, 2017)Most flowering plants, including major crops, rely on animal pollinators for sexual reproduction. Therefore, recent declines in pollinator populations worldwide pose significant threats to food production and biodiversity. ... -
The evolvability of animal-pollinated flowers: towards predicting adaptation to novel pollinator communities
Opedal, Øystein Hjorthol (Journal article; Peer reviewed, 2018)In the event of a community turnover, population decline, or complete disappearance ofpollinators, animal-pollinated plants may respond by adapting to novel pollinators or bychanging their mating system. The ability of ... -
Topographic complexity and biotic resilience to climate change
Opedal, Øystein Hjorthol (Master thesis, 2013)Topographically complex alpine terrains create a mosaic of diverse microclimates over short distances. This study investigated the extent of small-scale variation in temperature and soil moisture using dense arrays of ... -
Topographic complexity and biotic resilience to climate change
Opedal, Øystein Hjorthol (Master thesis, 2013)Topographically complex alpine terrains create a mosaic of diverse microclimates over short distances. This study investigated the extent of small-scale variation in temperature and soil moisture using dense arrays of ... -
Using ecological context to interpret spatiotemporal variation in natural selection
Albertsen, Elena; Opedal, Øystein Hjorthol; Bolstad, Geir Hysing; Pérez-Barrales, Rocío; Hansen, Thomas F; Pelabon, Christophe; Armbruster, William Scott (Peer reviewed; Journal article, 2020)Spatiotemporal variation in natural selection is expected, but difficult to estimate. Pollinator‐mediated selection on floral traits provides a good system for understanding and linking variation in selection to differences ... -
Vegetation change on mountaintops in northern Sweden: Stable vascular-plant but reordering of lichen and bryophyte communities
Hagenberg, Liyenne Wu Chen; Vanneste, Thomas; Opedal, Øystein Hjorthol; Petlund, Hanne Torsdatter; Björkman, Mats Peter; Björk, Robert G.; Holien, Håkon; Limpens, Juul; Molau, Ulf; Graae, Bente Jessen; De Frenne, Pieter (Peer reviewed; Journal article, 2022)Alpine ecosystems harbor remarkably diverse and distinct plant communities that are characteristically limited to harsh, and cold climatic conditions. As a result of thermal limitation to species occurrence, mountainous ...