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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 ...
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 ...
Pelagic organisms avoid white, blue, and red artificial light from scientific instruments
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-07-22)
In situ observations of pelagic fish and zooplankton with optical instruments usually rely on external light sources. However, artificial light may attract or repulse marine organisms, which results in biased measurements. It is often assumed that most pelagic organisms do not perceive the red part of the visible spectrum and that red light can be used for underwater optical measurements of biological ...
Pelagic occurrences of the ice amphipod Apherusa glacialis throughout the Arctic
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-01-10)
<i>Apherusa glacialis</i> is a common, sea ice-associated amphipod found throughout the Arctic Ocean and has long been considered permanently associated with the sea ice habitat. However, pelagic occurrences of <i>A. glacialis</i> have also been reported. It was recently suggested that <i>A. glacialis</i> overwinters at depth within the Atlantic-water inflow near Svalbard, to avoid being exported ...
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 ...