Malin Daase
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View article: First characterization of the marine ecosystem of Archer Fiord in the Lasting Ice Area of the high Arctic: a productivity paradox
First characterization of the marine ecosystem of Archer Fiord in the Lasting Ice Area of the high Arctic: a productivity paradox Open
The Lasting Ice Area along the northern coastline of Ellesmere Island and Greenland will be the region where Arctic multiyear sea ice will persist the longest in a warming climate, making this area critical for ice-dependent species. In 20…
View article: Income and capital breeding— <i>Calanus</i> reproduction in a subarctic fjord
Income and capital breeding— <i>Calanus</i> reproduction in a subarctic fjord Open
Copepods of the genus Calanus are key species in the energy transfer from primary producers to higher trophic levels in Arctic and sub‐Arctic seas. The timing of reproduction can differ between species, depending on whether they rely on ex…
View article: Meta-analysis of stage-specific <i>Calanus finmarchicus</i> vertical distribution in relation to hydrography and chlorophyll in the North Atlantic
Meta-analysis of stage-specific <i>Calanus finmarchicus</i> vertical distribution in relation to hydrography and chlorophyll in the North Atlantic Open
Calanus finmarchicus is an important, extensively studied zooplankton species in the North Atlantic. Many studies have explored its abundance and life cycle, but basin-wide relationships between its vertical distribution and environment du…
View article: Broadband acoustic classification of Atlantic cod, polar cod, and northern shrimp in in situ mesocosm experiments
Broadband acoustic classification of Atlantic cod, polar cod, and northern shrimp in in situ mesocosm experiments Open
View article: Extreme mismatch between phytoplankton and grazers during Arctic spring blooms and consequences for the pelagic food-web
Extreme mismatch between phytoplankton and grazers during Arctic spring blooms and consequences for the pelagic food-web Open
View article: Corrigendum: Response of the copepod community to interannual differences in sea-ice cover and water masses in the northern Barents Sea
Corrigendum: Response of the copepod community to interannual differences in sea-ice cover and water masses in the northern Barents Sea Open
Corrigendum: Response of the copepod community to interannual differences in sea-ice cover and water masses in the northern Barents Sea
View article: Zooplankton fecal pellet flux drives the biological carbon pump during the winter–spring transition in a high‐<scp>Arctic</scp> system
Zooplankton fecal pellet flux drives the biological carbon pump during the winter–spring transition in a high‐<span>Arctic</span> system Open
Recent research highlighted significant marine biological activity during the Arctic winter, with poorly known implications for the biological carbon pump. We used moored instruments to (1) track the development of the pelagic food web of …
View article: Response of the copepod community to interannual differences in sea-ice cover and water masses in the northern Barents Sea
Response of the copepod community to interannual differences in sea-ice cover and water masses in the northern Barents Sea Open
The reduction of Arctic summer sea ice due to climate change can lead to increased primary production in parts of the Barents Sea if sufficient nutrients are available. Changes in the timing and magnitude of primary production may have cas…
View article: Interactive Effects between Salinity and Temperature Variation on Energetic Responses of the Euphausiid Crustacean in the High Arctic
Interactive Effects between Salinity and Temperature Variation on Energetic Responses of the Euphausiid Crustacean in the High Arctic Open
View article: Model-informed classification of broadband acoustic backscatter from zooplankton in an <i>in situ</i> mesocosm
Model-informed classification of broadband acoustic backscatter from zooplankton in an <i>in situ</i> mesocosm Open
Classification of zooplankton to species with broadband echosounder data could increase the taxonomic resolution of acoustic surveys and reduce the dependence on net and trawl samples for ‘ground truthing’. Supervised classification with b…
View article: Development and calibration of a high dynamic range and autonomous ocean-light instrument to measure sub-surface profiles in ice-covered waters
Development and calibration of a high dynamic range and autonomous ocean-light instrument to measure sub-surface profiles in ice-covered waters Open
The opti cal c hain a nd l ogger (OptiCAL) is an autonomous ice-tethered observatory equipped with multiple light sensors for mapping the variation of light with depth. We describe the instrument and present an ensemble calibration for dow…
View article: Inverse method applied to autonomous broadband hydroacoustic survey detects higher densities of zooplankton in near-surface aggregations than vessel-based net survey
Inverse method applied to autonomous broadband hydroacoustic survey detects higher densities of zooplankton in near-surface aggregations than vessel-based net survey Open
Throughout all oceans, aggregations of zooplankton and ichthyoplankton appear as horizontal sound scattering layers (SSLs) when detected with active acoustic techniques. Quantifying the composition and density of these layers is prone to s…
View article: PolarFront May 2022 Cruise Report
PolarFront May 2022 Cruise Report Open
PolarFront May 2022 Cruise Report Edited by Malin Daase Published: 2022-09-30 DOI: 10.5281/zenodo.7128747 Version: 1.0.1 Cruise dates: 2022-05-18/2022-05-28 Ship: R/V Helmer Hanssen Contributions: 1. Hydrography
View article: Seasonal mesozooplankton patterns and timing of life history events in high-arctic fjord environments
Seasonal mesozooplankton patterns and timing of life history events in high-arctic fjord environments Open
Seasonal patterns in mesozooplankton composition, vertical distribution, and timing of reproduction are challenging to study in the open sea due to ocean currents and mix of populations of different origins. Sill fjords, on the other hand,…
View article: Contrasting Life Traits of Sympatric Calanus glacialis and C. finmarchicus in a Warming Arctic Revealed by a Year-Round Study in Isfjorden, Svalbard
Contrasting Life Traits of Sympatric Calanus glacialis and C. finmarchicus in a Warming Arctic Revealed by a Year-Round Study in Isfjorden, Svalbard Open
The calanoid copepod Calanus glacialis dominates the mesozooplankton biomass in the Arctic shelf seas, but its smaller North Atlantic sibling Calanus finmarchicus is expanding northwards and may potentially replace it if the climate contin…
View article: Accounting for Uncertainties in Biodiversity Estimations: A New Methodology and Its Application to the Mesopelagic Sound Scattering Layer of the High Arctic
Accounting for Uncertainties in Biodiversity Estimations: A New Methodology and Its Application to the Mesopelagic Sound Scattering Layer of the High Arctic Open
Measures of biological diversity (biodiversity) are important for monitoring the state of ecosystems. Several indices and methods are used to describe biodiversity from field observations. Marine faunal biodiversity is often quantified bas…
View article: High abundances of small copepods early developmental stages and nauplii strengthen the perception of a non-dormant Arctic winter
High abundances of small copepods early developmental stages and nauplii strengthen the perception of a non-dormant Arctic winter Open
The traditional view is that the Arctic polar night is a quiescent period for marine life, but recent reports of high levels of feeding and reproduction in both pelagic and benthic taxa have challenged this. We examined the zooplankton com…
View article: Surface aggregations of<i>Calanus finmarchicus</i>during the polar night
Surface aggregations of<i>Calanus finmarchicus</i>during the polar night Open
While marine ecosystems in polar areas were thought to be mostly inactive during the polar night, recent observations in the Arctic highlight that dynamic biological interactions occur across all trophic levels. One particularly interestin…
View article: Temperature and salinity time series in Svalbard fjords – 'Integrated Marine Observatory Partnership (iMOP II)
Temperature and salinity time series in Svalbard fjords – 'Integrated Marine Observatory Partnership (iMOP II) Open
This is chapter 1 of the State of Environmental Science in Svalbard (SESS) report 2021. We show temperature records from five marine observatories located around the fjords of Svalbard – Kongsfjorden (3 observatories), Isfjorden and Rijpfj…
View article: Can a key boreal Calanus copepod species now complete its life-cycle in the Arctic? Evidence and implications for Arctic food-webs
Can a key boreal Calanus copepod species now complete its life-cycle in the Arctic? Evidence and implications for Arctic food-webs Open
View article: Photophysiological cycles in Arctic krill are entrained by weak midday twilight during the Polar Night
Photophysiological cycles in Arctic krill are entrained by weak midday twilight during the Polar Night Open
Light plays a fundamental role in the ecology of organisms in nearly all habitats on Earth and is central for processes such as vision and the entrainment of the circadian clock. The poles represent extreme light regimes with an annual lig…
View article: Modelling the biogeographic boundary shift of <i>Calanus finmarchicus</i> reveals drivers of Arctic Atlantification by subarctic zooplankton
Modelling the biogeographic boundary shift of <i>Calanus finmarchicus</i> reveals drivers of Arctic Atlantification by subarctic zooplankton Open
Biological communities in the Arctic are changing through the climate‐driven encroachment of subarctic species. This “Atlantification” extends to keystone Calanoid copepods, as the small‐bodied Calanus finmarchicus increases in abundance i…
View article: Ice-Associated Amphipods in a Pan-Arctic Scenario of Declining Sea Ice
Ice-Associated Amphipods in a Pan-Arctic Scenario of Declining Sea Ice Open
Sea-ice macrofauna includes ice amphipods and benthic amphipods, as well as mysids. Amphipods are important components of the sympagic food web, which is fuelled by the production of ice algae. Data on the diversity of sea-ice biota have b…
View article: Autonomous Surface and Underwater Vehicles as Effective Ecosystem Monitoring and Research Platforms in the Arctic—The Glider Project
Autonomous Surface and Underwater Vehicles as Effective Ecosystem Monitoring and Research Platforms in the Arctic—The Glider Project Open
Effective ocean management requires integrated and sustainable ocean observing systems enabling us to map and understand ecosystem properties and the effects of human activities. Autonomous subsurface and surface vehicles, here collectivel…
View article: Seasonal Variability in the Zooplankton Community Structure in a Sub-Arctic Fjord as Revealed by Morphological and Molecular Approaches
Seasonal Variability in the Zooplankton Community Structure in a Sub-Arctic Fjord as Revealed by Morphological and Molecular Approaches Open
Phyto- and zooplankton in Arctic and sub-Arctic seas show very strong seasonal changes in diversity and biomass. Here we document the seasonal variability in the mesozooplankton community structure in a sub-Arctic fjord in Northern Norway …
View article: Pelagic organisms avoid white, blue, and red artificial light from scientific instruments
Pelagic organisms avoid white, blue, and red artificial light from scientific instruments Open
View article: Seasonal variability in non-consumptive mortality of Arctic zooplankton
Seasonal variability in non-consumptive mortality of Arctic zooplankton Open
Recent observations from high-latitude marine ecosystems indicate that non-consumptive mortality may be particularly high in Arctic zooplankton during the polar night. Here we have estimated the contribution of dead organisms to the mesozo…
View article: Eat or Sleep: Availability of Winter Prey Explains Mid-Winter and Spring Activity in an Arctic Calanus Population
Eat or Sleep: Availability of Winter Prey Explains Mid-Winter and Spring Activity in an Arctic Calanus Population Open
Copepods of the genus Calanus have adapted to high levels of seasonality in prey availability by entering a period of hibernation during winter known as diapause, but repeated observations of active Calanus spp. have been mad…
View article: Arctic sea-ice decline impacts on primary production
Arctic sea-ice decline impacts on primary production Open
<p>Arctic food webs are short and relatively species poor, rendering them vulnerable to changes or perturbations at any individual trophic level. High-latitude warming represents one major source of potential perturbation to Arctic m…
View article: Artificial light during the polar night disrupts Arctic fish and zooplankton behaviour down to 200 m depth
Artificial light during the polar night disrupts Arctic fish and zooplankton behaviour down to 200 m depth Open
For organisms that remain active in one of the last undisturbed and pristine dark environments on the planet—the Arctic Polar Night—the moon, stars and aurora borealis may provide important cues to guide distribution and behaviours, includ…