Blar i Brage IMR på forfatter "Christie, Hartvig C"
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Can multitrophic interactions and ocean warming influence large-scale kelp recovery?
Christie, Hartvig C; Gundersen, Hege; Rinde, Eli; Filbee-Dexter, Karen; Norderhaug, Kjell Magnus; Pedersen, Torstein; Bekkby, Trine; Gitmark, Janne Kim; Fagerli, Camilla With (Journal article; Peer reviewed, 2019)Ongoing changes along the northeastern Atlantic coastline provide an opportunity to explore the influence of climate change and multitrophic interactions on the recovery of kelp. Here, vast areas of sea urchin‐dominated ... -
Can sea urchin grazing of kelp forests in the arctic make rocky shore systems more vulnerable to oil spills?
Christie, Hartvig C; Bekkby, Trine; Norderhaug, Kjell Magnus; Beyer, Jonny; Jørgensen, Nina Mari (Peer reviewed; Journal article, 2019)In Arctic Norway, the risk of major marine oil spills associated with increasing offshore drilling, land terminal, and maritime transport activities is a cause for concern. Intertidal and subtidal kelp and seaweed communities ... -
Effects of depth and overgrowth of ephemeral macroalgae on a remote subtidal NE Atlantic eelgrass (Zostera marina) community
Baden, Susanne; Fredriksen, Stein; Christie, Hartvig C; Eriander, Louise; Gustafsson, Camilla; Holmer, Marianne; Olesen, Birgit; Thormar, Jonas; Boström, Christoffer (Peer reviewed; Journal article, 2022)We conducted a short-term field sampling complemented with time integrating stable isotope analysis to holistically investigate status and ecological interactions in a remote NE Atlantic Zostera marina meadow. We found ... -
Effects of depth and overgrowth of ephemeral macroalgae on a remote subtidal NE Atlantic eelgrass (Zostera marina) community
Baden, Susanne; Fredriksen, Stein; Christie, Hartvig C; Eriander, Louise; Gustafsson, Camilla; Holmer, Marianne; Olesen, Birgit; Thormar, Jonas; Boström, Christoffer (Peer reviewed; Journal article, 2022)We conducted a short-term field sampling complemented with time integrating stable isotope analysis to holistically investigate status and ecological interactions in a remote NE Atlantic Zostera marina meadow. We found ... -
Efficient coralline algal psbA mini barcoding and High Resolution Melt HRM) analysis using a simple custom DNA preparation
Anglès d'Auriac, Marc; Le Gall, Line; Peña, Viviana; Hall-Spencer, Jason M.; Steneck, Robert S.; Fredriksen, Stein; Gitmark, Janne Kim; Christie, Hartvig C; Husa, Vivian; Grefsrud, Ellen Sofie; Rinde, Eli (Journal article; Peer reviewed, 2019)Coralline algae form extensive maerl and rhodolith habitats that support a rich biodiversity. Calcium carbonate harvesting as well as trawling activities threatens this ecosystem. Eleven species were recorded so far as ... -
Efficient coralline algal psbA mini barcoding and High Resolution Melt HRM) analysis using a simple custom DNA preparation
Anglès d'Auriac, Marc; Le Gall, Line; Peña, Viviana; Hall-Spencer, Jason M.; Steneck, Robert S.; Fredriksen, Stein; Gitmark, Janne Kim; Christie, Hartvig C; Husa, Vivian; Grefsrud, Ellen Sofie; Rinde, Eli (Peer reviewed; Journal article, 2019)Coralline algae form extensive maerl and rhodolith habitats that support a rich biodiversity. Calcium carbonate harvesting as well as trawling activities threatens this ecosystem. Eleven species were recorded so far as ... -
Genetic heterogeneity of two bioeconomically important kelp species along the Norwegian coast
Evankow, Ann; Christie, Hartvig C; Hancke, Kasper; Brysting, Anne Krag; Junge, Claudia; Fredriksen, Stein; Thaulow, Jens (Journal article; Peer reviewed, 2019)Knowledge of genetic diversity among wild populations is becoming increasingly important as more species are recognized for their bioeconomic value. Industrialization of natural resources, such as kelp in the marine shallow ... -
In a squeeze: Epibiosis may affect the distribution of kelp forests
Andersen, Guri Sogn; Christie, Hartvig C; Moy, Frithjof Emil (Journal article; Peer reviewed, 2019)The processes limiting the population recovery of the kelp Saccharina latissima after recent large‐scale loss from the south coast of Norway are poorly understood. Previous investigations do, however, suggest that the ... -
Lithothamnion (Hapalidiales, Rhodophyta) in the changing Arctic and Subarctic: DNA sequencing of type and recent specimens provides a systematics foundation
Peña, Viviana; Bélanger, David; Gagnon, Patrick; Richards, Joseph L.; Gall, Line Le; Hughey, Jeffery R.; Saunders, Gary W.; Lindstrom, Sandra C.; Rinde, Eli; Husa, Vivian; Christie, Hartvig C; Fredriksen, Stein; Hall-Spencer, Jason M.; Steneck, Robert S.; Schoenrock, Kathryn M.; Gitmark, Janne Kim; Grefsrud, Ellen Sofie; Anglès d'Auriac, Marc; Legrand, Erwann; Grall, Jacques; Mumford, Thomas F.; Kamenos, Nicholas A.; Gabrielson, Paul W. (Peer reviewed; Journal article, 2021)Coralline red algae in the non-geniculate genera Clathromorphum, Phymatolithon and Lithothamnion are important benthic ecosystem engineers in the photic zone of the Arctic and Subarctic. In these regions, the systematics ... -
Local flexibility in feeding behaviour and contrasting microhabitat use of an omnivore across latitudes
Leclerc, Jean-Charles; de Bettignies, Thibaut; de Bettignies, Florian; Christie, Hartvig C; Franco, João N; Leroux, Cédric; Davoult, Dominique; Pedersen, Morten F; Filbee-Dexter, Karen; Wernberg, Thomas (Peer reviewed; Journal article, 2021)As the environment is getting warmer and species are redistributed, consumers can be forced to adjust their interactions with available prey, and this could have cascading effects within food webs. To better understand the ... -
Macrophytes as habitat for fish
Christie, Hartvig C; Andersen, Guri Sogn; Tveiten, Lise Ann; Moy, Frithjof Emil (Peer reviewed; Journal article, 2022)As different macrophyte habitats house different distributions of invertebrates, we questioned if differences in the composition of fish in these habitats also could be identified. Additionally, we addressed the question ... -
Norwegian kelp forest restauration - Kelp restoration actions in Norway, 1988-2022.
Bekkby, Trine; Christie, Hartvig C; Fagerli, Camilla With; Rinde, Eli; Strand, Hans Kristian (Lecture, 2023)The extensive kelp forests between 58 and 71oN along the Norwegian coastline have suffered greatly from sea urchin grazing since the 1970-ies (Mid and North Norway) and from turf/filamentous algal competition (South and ... -
Optimizing the use of quicklime (CaO) for sea urchin management — A lab and field study
Strand, Hans Kristian; Christie, Hartvig C; Fagerli, Camilla With; Mengede, Martin; Moy, Frithjof Emil (Peer reviewed; Journal article, 2020)Mass blooms of sea urchins sometimes cause kelp forest collapses that can last for decades. Quicklime has historically been used to reverse those conditions, but the efficacy of liming has varied along latitudinal and ... -
Predation mortality from ambush and cruising predators on newly-settled 0-group gadoids
Pedersen, Torstein; Strand, Hans Kristian; Christie, Hartvig C; Moy, Frithjof (Peer reviewed; Journal article, 2020)We investigated predation from an ambush predator (shorthorn sculpin) and two cruising predators (Atlantic cod and saithe) on bottom-settled 0-group cod and saithe juveniles in a fjord in northern Norway. Stomach contents ... -
Synergism between cruising cod and ambush sculpin predators on 0-group gadoids is modified by daylight cycle and presence of aggressive wolffish
Strand, Hans Kristian; Pedersen, Torstein; Christie, Hartvig C; Moy, Frithjof Emil (Peer reviewed; Journal article, 2020)Shorthorn sculpin (Myoxocephalus scorpius) and large cod (300–400 g body weight) are important predators on newly settled 0-group cod (Gadus morhua) and saithe (Pollachius virens) in Porsangerfjorden in northern Norway. ... -
Tallknusing av sukkertaredata
Gundersen, Hege; Norderhaug, Kjell Magnus; Christie, Hartvig C; Moy, Frithjof Emil; Hjermann, Dag Øystein; Vedal, Jens; Ledang, Anna Birgitta; Gitmark, Janne Kim; Walday, Mats (Research report, 2014)Norsk institutt for vannforskning (NIVA) og Havforskningsinstituttet (HI) har gjennomført prosjektet «Tallknusing av sukkertare-data», på oppdrag fra Miljødirektoratet. Gjennom prosjektet har tilgjengelige data som kan ... -
The abundance of kelp is modified by the combined impact of depth, waves and currents
Bekkby, Trine; Smit, Cecilie; Gundersen, Hege; Rinde, Eli; Steen, Henning; Tveiten, Lise Ann; Gitmark, Janne Kim; Fredriksen, Stein; Albretsen, Jon; Christie, Hartvig C (Journal article; Peer reviewed, 2019)This study analyses the combined impact of two types of ocean water flow, wave exposure and ocean currents, on kelp Laminaria hyperborea abundance, taking other environmental co-variables into account. The dataset covers ...