Søk
Viser treff 1-6 av 6
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 and diel vertical migration of zooplankton in the High Arctic during the autumn midnight sun of 2008
(Journal article; Tidsskriftartikkel; Peer reviewed, 2011)
The diel vertical migration (DVM) of Calanus (Calanus finmarchicus, Calanus glacialis and Calanus hyperboreus) and Metridia longa was investigated in August 2008 at six locations to the north and northwest of Svalbard (Rijpfjorden, Ice, Marginal Ice Zone, Shelf break, Shelf and Kongsfjorden). Despite midnight sun conditions, a diel light cycle was clearly observed at all stations. We collected data ...
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 ...
Mesopelagic sound scattering layers of the high Arctic: Seasonal variations in biomass, species assemblage, and trophic relationships
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-07-12)
Mesopelagic sound scattering layers (SSL) are ubiquitous in all oceans. Pelagic organisms within the SSL play important roles as prey for higher trophic levels and in climate regulation through the biological carbon pump. Yet, the biomass and species composition of SSL in the Arctic Ocean remain poorly documented, particularly in winter. A multifrequency echosounder detected a SSL north of Svalbard, ...
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 ...