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Lipid sac area as a proxy for individual lipid content of arctic calanoid copepods
(Journal article; Tidsskriftartikkel; Peer reviewed, 2010)
We present an accurate, fast, simple and non-destructive photographic method to estimate wax ester and lipid content in single individuals of the calanoid copepod genus Calanus and test this method against gas-chromatographic lipid measurements.
Potential misidentifications of two climate indicator species of the marine arctic ecosystem: Calanus glacialis and C. finmarchicus
(Journal article; Tidsskriftartikkel; Peer reviewed, 2012)
Calanoid copepods of the genus Calanus represent an important, nutrient-rich food source for a multitude of Arctic marine organisms. Although morphologically very similar, their life histories and ecological roles differ. Because the distribution of Calanus glacialis and C. finmarchicus corresponds to Arctic and Atlantic water masses, respectively, they are regularly used as climate indicators. A ...
Seasonal vertical strategies in a high-Arctic coastal zooplankton community
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-08-18)
We studied the larger (>1000 µm) size fraction of zooplankton in an Arctic coastal
water community in Billefjorden, Svalbard (78°40’ N), Norway, in order to describe seasonal vertical
distributions of the dominant taxa in relation to environmental variability. Calanus spp.
numerically dominated the herbivores; Aglantha digitale, Mertensia ovum, Beroë cucumis, and
Parasagitta elegans were the ...
Gender specific reproductive strategies of an arctic key species (Boreogadus saida) and implications of climate change
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014)
Arctic complexity: A case study on diel vertical migration of zooplankton
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014)
In the dark: a review of ecosystem processes during the Arctic polar night
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-08-28)
Several recent lines of evidence indicate that the polar night is key to understanding Arctic marine
ecosystems. First, the polar night is not a period void of biological activity even though primary production
is close to zero, but is rather characterized by a number of processes and interactions yet to be fully
understood, including unanticipated high levels of feeding and reproduction in a ...
Seasonal shifts in feeding patterns: Individual and population realized specialization in a high Arctic fish
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-09-21)
Species with a broad and flexible diet may be at an advantage in a rapidly changing environment such as in today's Arctic ecosystems. Polar cod (<i>Boreogadus saida</i>), an abundant and ecologically important circumpolar Arctic fish, is often described as a zooplankton generalist feeder, which suggests that it may cope successfully with changes in prey composition. This description is justified ...
Pelagic food-webs in a changing Arctic: a trait-based perspective suggests a mode of resilience
(Journal article; Tidsskriftartikkel; Peer reviewed, 2018-06-27)
Arctic marine ecosystems support fisheries of significant and increasing economic and nutritional value. Commercial stocks are sustained by pelagic food webs with relatively few keystone taxa mediating energy transfer to higher trophic levels, and it remains largely unknown how these taxa will be affected by changing climate and the influx of boreal taxa. <i>Calanus</i> species store large quantities ...
Is ambient light during the high Arctic polar night sufficient to act as a visual cue for zooplankton?
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-06-03)
The light regime is an ecologically important factor in pelagic habitats, influencing a range of
biological processes. However, the availability and importance of light to these processes in
high Arctic zooplankton communities during periods of 'complete' darkness (polar night) are
poorly studied. Here we characterized the ambient light regime throughout the diel cycle
during the high Arctic ...
Retention of ice-associated amphipods: possible consequences for an ice-free Arctic Ocean
(Journal article; Tidsskriftartikkel; Peer reviewed, 2012-09-12)
Recent studies predict that the Arctic Ocean will
have ice-free summers within the next 30 years.
This poses a significant challenge for the marine
organisms associated with the Arctic sea ice,
such as marine mammals and, not least, the iceassociated crustaceans generally considered to
spend their entire life on the underside of the
Arctic sea ice. Based upon unique samples collected within ...