A5043361633- Marine and coastal ecosystems
- Isotope Analysis in Ecology
- Marine Biology and Ecology Research
- Arctic and Antarctic ice dynamics
- Marine Bivalve and Aquaculture Studies
- Marine and fisheries research
- Methane Hydrates and Related Phenomena
- Climate change and permafrost
- Ocean Acidification Effects and Responses
- Physiological and biochemical adaptations
- Marine and coastal plant biology
- Marine animal studies overview
- Arctic and Russian Policy Studies
- Food Industry and Aquatic Biology
- Polar Research and Ecology
- Marine and environmental studies
- Geology and Paleoclimatology Research
- Indigenous Studies and Ecology
- Atmospheric and Environmental Gas Dynamics
- Lichen and fungal ecology
- Cryospheric studies and observations
- Coastal wetland ecosystem dynamics
- Genetic diversity and population structure
- Microbial Community Ecology and Physiology
- Plant Ecology and Taxonomy Studies
University Centre in Svalbard
2011-2023
UiT The Arctic University of Norway
2003-2023
Akvaplan-niva
2006-2008
Norwegian Polar Institute
2003-2008
Abstract The Arctic bloom consists of two distinct categories primary producers, ice algae growing within and on the underside sea ice, phytoplankton in open waters. Long chain omega‐3 fatty acids, a subgroup polyunsaturated acids (PUFAs) produced exclusively by these algae, are essential to all marine organisms for successful reproduction, growth, development. During an extensive field study shelf seas, we followed seasonal biomass development their food quality terms relative PUFA content....
High-latitude environments show extreme seasonal variation in physical and biological variables. The classic paradigm of Arctic marine ecosystems holds that most processes slow down or cease during the polar night. One key process is generally assumed to winter diel vertical migration (DVM) zooplankton. DVM constitutes largest synchronized movement biomass on planet, paramount importance for ecosystem function carbon cycling. Here we present acoustic data demonstrate a behaviour zooplankton...
The timing of reproductive events Calanus glacialis is closely coupled to the two major marine primary production in Arctic: ice algal and phytoplankton blooms. Reproductive strategies vary between different physical biological environments European Canadian Arctic. In Beaufort Sea high Arctic Rijpfjorden on Svalbard, C. utilized algae bloom fuel spawning spring, while growth development new generation was primarily supported by bloom. predominantly ice-free Kongsfjorden (Svalbard), mainly a...
Abstract Stable isotope and fatty acid trophic markers (FATMs) were used to assess carbon flow structures of sympagic, pelagic benthic communities in high-Arctic Svalbard. Three regions sampled: Northwest Svalbard – dominated by Atlantic water (AtW) limited seasonal sea ice; Northern AtW perennial Northeast Arctic (ArW) extensive ice. four levels (TL) found the three habitats, with a dominance omnivores (TL = 2.4–2.7). Ice fauna relied on phytoplankton ice algae, zooplankton primarily...
Climate-change driven increases in temperature and precipitation are leading to increased discharge of freshwater terrestrial material Arctic coastal ecosystems. These inputs bring sediments, nutrients organic matter (OM) across the land-ocean interface with a range implications for ecosystems biogeochemical cycling. To investigate responses inputs, physicochemical conditions were characterized river- glacier-influenced fjord system (Isfjorden, Svalbard) from May August 2018 2019. Our...
Arctic marine ecosystems support fisheries of significant and increasing economic nutritional value. Commercial stocks are sustained by pelagic food webs with relatively few keystone taxa mediating energy transfer to higher trophic levels, it remains largely unknown how these will be affected changing climate the influx boreal taxa. Calanus species store large quantities lipids, making zooplankton a critical link in food-webs. The usually larger and, importantly, have been suggested contain...
Abstract Fjord systems are transition zones between land and sea, resulting in complex dynamic environments. They of particular interest the Arctic as they harbour ecosystems inhabited by a rich range species provide many societal benefits. The key drivers change European (i.e., Greenland, Svalbard, Northern Norway) fjord socio-ecological reviewed here, structured into five categories: cryosphere (sea ice, glacier mass balance, glacial riverine discharge), physics (seawater temperature,...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 328:17-28 (2006) - doi:10.3354/meps328017 Sample preparation effects on stable C and N isotope values: a comparison of methods in Arctic marine food web studies Janne E. Søreide1,2,*, Tobias Tamelander3,2, Haakon Hop3, Keith A. Hobson4, Ingar Johansen5 1Akvaplan-niva, 9296 Tromsø, Norway 2Norwegian College...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 411:49-60 (2010) - DOI: https://doi.org/10.3354/meps08647 Increased irradiance reduces food quality of sea ice algae E. Leu1,*, J. Wiktor2, Søreide3, Berge3,4, S. Falk-Petersen1,5 1Norwegian Polar Institute, Environmental Centre, 9296 Tromsø, Norway 2Institute Oceanology, Polish Academy Sciences, Powstanców...
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...
Diel vertical migration (DVM) of zooplankton is a global phenomenon, characteristic both marine and limnic environments. At high latitudes, patterns DVM have been documented, but rather little knowledge exists regarding which species perform this ecologically important behaviour. Also, in the Arctic, vertically migrating components community are usually regarded as single sound scattering layer (SSL) performing synchronized directly controlled by ambient light. Here, we present evidence for...
Meroplankton is often neglected in Arctic zooplankton studies, so our knowledge about their seasonal dynamics limited. To investigate the highly dynamic nature of meroplankton, we sampled community a high-Arctic fjord West-Spitsbergen bi-weekly from December 2011 to 2012. Five significantly different meroplankton assemblages were identified, representing winter, early spring, summer and autumn. persistently dominated during productive seasons both abundance (41–91%) biomass (54–98%)....
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 one of the Polar regions where current climate and ecosystem change most pronounced. Here we review state knowledge physical, chemical biological systems in Sea. Physical conditions this area are characterized by large seasonal contrasts between partial sea-ice cover winter spring versus predominantly open water summer autumn. Observations over recent decades show that surface air ocean temperatures have increased, extent has decreased, stratification weakened, chemistry...
Climate-driven alterations of the marine environment are most rapid in Arctic and subarctic regions, including Hudson Bay northern Canada, where declining sea ice, warming surface waters ocean acidification occurring at alarming rates. These changes altering primary production patterns that will ultimately cascade up through food web. Here, we investigated (i) vertical trophic structure Southampton Island ecosystem Bay, (ii) contribution benthic pelagic-derived prey to higher level species,...
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...
Calanoid copepods of the genus Calanus represent an important, nutrient-rich food source for a multitude Arctic marine organisms. Although morphologically very similar, their life histories and ecological roles differ. Because distribution glacialis C. finmarchicus corresponds to Atlantic water masses, respectively, they are regularly used as climate indicators. A correct identification these species is therefore necessary in many ecological, environmental climatological studies. In this...
Abstract The copepod species Calanus glacialis is an important component of arctic marine food webs, where it the numerically dominant zooplankton grazer and serves as a major prey item for fish, seabirds, other predators. These copepods are typically considered to be phytoplanktivorous, although they also known feed on microzooplankton, little about their diet in fall winter. To investigate feeding, C. gut contents were analyzed over annual cycle seasonally ice covered fjord using next...