A5084227472- Marine and coastal ecosystems
- Marine Biology and Ecology Research
- Marine and fisheries research
- Isotope Analysis in Ecology
- Arctic and Antarctic ice dynamics
- Microbial Community Ecology and Physiology
- Methane Hydrates and Related Phenomena
- Ocean Acidification Effects and Responses
- Genetic diversity and population structure
- Marine Toxins and Detection Methods
- Atmospheric and Environmental Gas Dynamics
- Marine and environmental studies
- Marine and coastal plant biology
- Aquatic Ecosystems and Phytoplankton Dynamics
- Marine Bivalve and Aquaculture Studies
- Plant Ecology and Taxonomy Studies
- Mediterranean and Iberian flora and fauna
- Cephalopods and Marine Biology
- Geological Studies and Exploration
- Marine Biology and Environmental Chemistry
- Aquatic Invertebrate Ecology and Behavior
- Protist diversity and phylogeny
- Crustacean biology and ecology
- Food Industry and Aquatic Biology
- Environmental DNA in Biodiversity Studies
UiT The Arctic University of Norway
2014-2025
Centre for Arctic Gas Hydrate, Environment and Climate
2020-2025
We quantified prey encounter rates and reaction distances in the ambush-feeding cyclopoid copepod Oithona similis by video recording freely swimming copepods at different concentrations of prey, dinoflagellate Gymnodinium dominans. Prey rate increased with concentration, a maximal clearance 0.42 ± 0.10 ml h–1 was estimated. The average distance (from antennules) which O.similis reacts to is 0.014 0.007 cm. A simple model used combine observed predator velocities distance, yielded similar...
Abstract Copepods of the genus Calanus play a key role in marine food webs as consumers primary producers and prey for many commercially important species. Within genus, glacialis finmarchicus are considered indicator species Arctic Atlantic waters, respectively, changes their distributions frequently used tool to track climate change effects ecosystems northern hemisphere. Despite extensive literature available, discrimination between these two remains challenging. Using genetically...
Planktonic copepods of the genus Calanus play a central role in North Atlantic/Arctic marine food webs. Here, using molecular markers, we redrew distributional ranges species inhabiting Atlantic and Arctic Oceans revealed much wider more broadly overlapping distributions than previously described. The shelf species, C. glacialis , dominated zooplankton assemblage many Norwegian fjords, where only finmarchicus has been reported previously. In these high occurrences hyperboreus were also...
The Barents Sea is undergoing rapid ocean warming with less sea ice and increased Atlantic inflow, shifting the pelagic ecosystem towards a more boreal one, process referred to as Atlantification. While such changes have already been documented in southern central Sea, known about degree of Atlantification northern Arctic Ocean. In this seasonal study, we identified mesozooplankton biodiversity, abundance biomass Northern along transect seven stations stretching from (76°N) across shelf...
Abstract Widespread ocean acidification ( OA ) is modifying the chemistry of global ocean, and Arctic recognized as region where changes will progress at fastest rate. Moreover, species show lower capacity for cellular homeostasis acid‐base regulation rendering them particularly vulnerable to . In present study, we found physiological differences in response across geographically separated populations keystone copepod Calanus glacialis copepodites stage CIV , measured reaction norms...
The projected transition of the central Arctic Ocean (CAO) into a warmer, seasonally ice-free ocean requires more knowledge this environment to predict changes in structure and dynamics its ecosystems. We aimed compare state underlying processes Nansen Basin Amundsen ecosystems observed August–September 2021 assess impacts Atlantic Water inflow fresher Transpolar Drift waters, respectively, on these basins differed features sea ice, hydrography, chemical biological compositions. near-slope...
<title>Abstract</title> Marine nematodes dominate the meiofauna of benthic sediments, but few studies have investigated their trophic roles. We studied eukaryote diet composition from surface sediments on Arctic Barents Sea shelf, shelf break and adjacent Nansen Basin, during four seasons, using prey metabarcoding 18S ribosomal RNA gene. Monhysterida (35), Chromadorida (34), Araeolaimida (27) Enoplida (22) were most frequently observed across study area, diets composed diverse metazoan,...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 304:265-270 (2005) - doi:10.3354/meps304265 Fate of copepod faecal pellets and role Oithona spp. Marit Reigstad*, Christian Wexels Riser, Camilla Svensen Norwegian College Fishery Science, University Tromsø, 9037 Norway *Email: maritr@nfh.uit.no ABSTRACT: Because downward flux zooplankton (FP) measured in...
The Arctic Ocean is changing rapidly with respect to ice cover extent and volume, growth season duration biological production. Zooplankton are important components in the arctic marine food web, tightly coupled strong seasonality primary In this study, we investigate zooplankton composition, including microzooplankton, copepod nauplii, as well small large taxa, productivity dynamic Atlantic water inflow area north of Svalbard May August 2014. We focus on seasonal differences community...
Abstract The attenuation coefficient b is one of the most common ways to describe how strong carbon flux attenuated throughout water column. Therefore, an essential input variable in many and climate models. Marsay et al. (2015, https://doi.org/10.1073/pnas.1415311112 ) proposed that median surface temperature (0–500 m) may be a predictor , but our observations from Arctic waters challenge this hypothesis. We found highly ( = 0.43–1.84) cold (<4.1 °C). Accordingly, we suggest not globally...
The reduction of Arctic summer sea ice due to climate change can lead increased primary production in parts the Barents Sea if sufficient nutrients are available. Changes timing and magnitude may have cascading consequences for zooplankton community ultimately higher trophic levels. In food webs, both small large copepods commonly present, but different life history strategies hence responses environmental change. We investigated how contrasting sea-ice cover water masses northern influenced...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 462:39-49 (2012) - DOI: https://doi.org/10.3354/meps09808 Degradation of copepod faecal pellets in upper layer: role microbial community and Calanus finmarchicus Camilla Svensen*, Christian Wexels Riser, Marit Reigstad, Lena Seuthe Faculty Biosciences, Fisheries Economics, University Tromsø, 9037 Norway...
The Barents Sea polar front is characterized by high primary production following the retreat of ice edge during spring. However, secondary estimates mesozooplankton across are scarce, despite being essential for understanding energy flow through food web. We investigated community composition and (75°-78°N) in June, covering both Atlantic Arctic water masses with spatial taxonomic resolution. highlight contribution small large groups estimate comparing evaluating 4 commonly used growth rate...
Vertical flux of faecal pellets was compared in 26 vertically stratified 27 m3 (diameter 2 m, depth 9.3 m) situ seawater enclosures deriving from four separate experiments on the Norwegian west coast. Sediment traps were mounted non-mixed lower layer at 8 m depth. The zooplankton community composition natural three experiments, while manipulated to include concentrations Calanus finmarchicus one. Calanoid copepods such as C. finmarchicus, Paracalanus spp., Pseudocalanus spp. and Microcalanus...
Abstract The traditional view is that the Arctic polar night a quiescent period for marine life, but recent reports of high levels feeding and reproduction in both pelagic benthic taxa have challenged this. We examined zooplankton community present Svalbard fjords, coastal waters, shelf break north Svalbard, during night. focused on population structure abundant copepods ( Calanus finmarchicus , glacialis Metridia longa Oithona similis Pseudocalanus spp., Microcalanus Microsetella norvegica...
Arctic copepods are major grazers and vital food for planktivores in polar ecosystems but challenging to observe due remoteness seasonal sea ice coverage. Models offer higher spatio-temporal resolution, individual-based models (IBMs) useful since they incorporate individual variability which characterizes most copepod populations. Here, we present an IBM of the Calanus glacialis, a key secondary producer regions Barents Sea. The model is coupled three-dimensional physical-biological model,...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 217:67-80 (2001) - doi:10.3354/meps217067 Can silicate and turbulence regulate vertical flux of biogenic matter? A mesocosm study Camilla Svensen1,*, Jorun K. Egge2, Jan Erik Stiansen3 1Norwegian College Fishery Science, University Tromsø, Tromsø 9037, Norway 2Department Fisheries Biology, Bergen, HIB, Bergen...
AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 55:115-130 (2009) - DOI: https://doi.org/10.3354/ame01289 Transfer of nodularin copepod Eurytemora affinis through microbial food web S. Sopanen1,*, P. Uronen2, Kuuppo1, C. Svensen3, A. Rühl4, T. Tamminen1, E. Granéli5, Legrand5 1Finnish Environment Institute, PO Box 140, 00251 Helsinki, Finland 2Tvärminne Zoological...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 516:61-70 (2014) - DOI: https://doi.org/10.3354/meps10976 Increased degradation of copepod faecal pellets by co-acting dinoflagellates and Centropages hamatus Camilla Svensen1,*, Nathalie Morata2, Marit Reigstad1 1Faculty Biosciences, Fisheries Economics, UiT The Arctic University Norway, 9037 Tromsø, Norway...