Barbara Niehoff
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View article: Of sequences and images - diversity and quantity of Arctic epipelagic zooplankton by an integrative approach
Of sequences and images - diversity and quantity of Arctic epipelagic zooplankton by an integrative approach Open
Due to the high sensitivity of zooplankton to environmental fluctuations, monitoring their taxonomic composition, abundance and biomass is of high priority to identify changes in the ecosystem. Recent advances in imaging and molecular tech…
View article: Refining Zooplankton Diet Composition Studies Over Short and Long Time Scales by Combining 18S Metabarcoding With Fatty Acid Analyses
Refining Zooplankton Diet Composition Studies Over Short and Long Time Scales by Combining 18S Metabarcoding With Fatty Acid Analyses Open
Understanding diet composition is essential for unravelling trophic interactions in aquatic ecosystems. DNA metabarcoding, utilising various variable regions of the 18S rRNA gene, is increasingly employed to investigate zooplankton diet co…
View article: Beyond blooms: the winter ecosystem reset determines microeukaryotic community dynamics in the Fram Strait
Beyond blooms: the winter ecosystem reset determines microeukaryotic community dynamics in the Fram Strait Open
The Arctic Ocean is undergoing a major transition as a result of global warming, with uncertain consequences for its ecosystems. Our study introduces an integrated analytical approach using co-occurrence networks, convergent cross-mapping,…
View article: First release of the Pelagic Size Structure database: global datasets of marine size spectra obtained from plankton imaging devices
First release of the Pelagic Size Structure database: global datasets of marine size spectra obtained from plankton imaging devices Open
In marine ecosystems, most physiological, ecological, or physical processes are size dependent. These include metabolic rates, the uptake of carbon and other nutrients, swimming and sinking velocities, and trophic interactions, which event…
View article: Insights into the diet and feeding behavior of immature polar cod (<i>Boreogadus saida</i>) from the under‐ice habitat of the central <scp>Arctic Ocean</scp>
Insights into the diet and feeding behavior of immature polar cod (<i>Boreogadus saida</i>) from the under‐ice habitat of the central <span>Arctic Ocean</span> Open
Polar cod ( Boreogadus saida ) is an endemic key species of the Arctic Ocean ecosystem. The ecology of this forage fish is well studied in Arctic shelf habitats where a large part of its population lives. However, knowledge about its ecolo…
View article: Unprecedented insights into extents of biological responses to physical forcing in an Arctic sub-mesoscale filament by combining high-resolution measurement approaches
Unprecedented insights into extents of biological responses to physical forcing in an Arctic sub-mesoscale filament by combining high-resolution measurement approaches Open
In Fram Strait, we combined underway-sampling using the remote-controlled Automated Filtration System for Marine Microbes (AUTOFIM) with CTD-sampling for eDNA analyses, and with high-resolution optical measurements in an unprecedented appr…
View article: Reply on RC2
Reply on RC2 Open
Abstract. In marine ecosystems, most physiological, ecological, or physical processes are size-dependent. These include metabolic rates, uptake of carbon and other nutrients, swimming and sinking velocities, and trophic interactions, which…
View article: Comment on essd-2023-479
Comment on essd-2023-479 Open
Abstract. In marine ecosystems, most physiological, ecological, or physical processes are size-dependent. These include metabolic rates, uptake of carbon and other nutrients, swimming and sinking velocities, and trophic interactions, which…
View article: Overview of the MOSAiC expedition: Ecosystem
Overview of the MOSAiC expedition: Ecosystem Open
The international and interdisciplinary sea-ice drift expedition “The Multidisciplinary drifting Observatory for the Study of Arctic Climate” (MOSAiC) was conducted from October 2019 to September 2020. The aim of MOSAiC was to study the in…
View article: The Reproduction Of Calanus Finmarchicus In The Norwegian Sea In Spring
The Reproduction Of Calanus Finmarchicus In The Norwegian Sea In Spring Open
No abstracts are to be cited without prior reference to the author.The reproductive biology of Calanus finmarchicus was investigated in the Norwegian Sea alonga transect from N 62° 22' E 5° 12' to N 64° E 0° 0', which was sarnpled twice in…
View article: Influence of short-term nutritional variations on digestive enzyme and fatty acid patterns of the calanoid copepod Temora longicornis
Influence of short-term nutritional variations on digestive enzyme and fatty acid patterns of the calanoid copepod Temora longicornis Open
No abstracts are to be cited without prior reference to the author.The small calanoid copepod Temora longicornis is a temperate-water species with low lipid reserves and high biomass turnover rates. To survive and reproduce successfully, t…
View article: Calanus Finmarchicus Feeding And Reproduction: A High Frequency Time Series At Weathership M, Norwegian Sea, During The 1997 Spring Bloom
Calanus Finmarchicus Feeding And Reproduction: A High Frequency Time Series At Weathership M, Norwegian Sea, During The 1997 Spring Bloom Open
No abstracts are to be cited without prior reference to the author.The objective of this study was to quantify, feeding and reproduction ofC.finmarchicus, at an open sea station, from the ascent of the overwintering population in early spr…
View article: First release of the Pelagic Size Structure database: Global datasets of marine size spectra obtained from plankton imaging devices
First release of the Pelagic Size Structure database: Global datasets of marine size spectra obtained from plankton imaging devices Open
In marine ecosystems, most physiological, ecological, or physical processes are size-dependent. These include metabolic rates, uptake of carbon and other nutrients, swimming and sinking velocities, and trophic interactions, which eventuall…
View article: Unprecedented insights into extents of biological responses to physical forcing in an Arctic sub-mesoscale filament by combining high-resolution measurement approaches
Unprecedented insights into extents of biological responses to physical forcing in an Arctic sub-mesoscale filament by combining high-resolution measurement approaches Open
In Fram Strait, we combined underway-sampling using the remote-controlled Auto mated Fi ltration System for M arine Microbes (AUTOFIM) with CTD-sampling for eDNA analyses, and with high-resolution optical measurements in an unprecedented a…
View article: Sea-ice decline makes zooplankton stay deeper for longer
Sea-ice decline makes zooplankton stay deeper for longer Open
As Arctic sea ice deteriorates, more light enters the Arctic Ocean, causing largely unknown effects on the ecosystem. A novel autonomous bio-physical observatory provided the first record of zooplankton vertical distribution under sea ice …
View article: Seasonal Enzyme Activities of Sympatric Calanus glacialis and C. finmarchicus in the High-Arctic
Seasonal Enzyme Activities of Sympatric Calanus glacialis and C. finmarchicus in the High-Arctic Open
In the Arctic shelf seas, the mesozooplankton biomass is dominated by the arctic copepod Calanus glacialis , but its boreal congeneric C. finmarchicus is expanding northwards. Even though it is already there, C. finmarchicus may not be abl…
View article: Testing the usefulness of optical data for zooplankton long‐term monitoring: Taxonomic composition, abundance, biomass, and size spectra from <scp>ZooScan</scp> image analysis
Testing the usefulness of optical data for zooplankton long‐term monitoring: Taxonomic composition, abundance, biomass, and size spectra from <span>ZooScan</span> image analysis Open
The pelagic ecosystem of the Arctic Ocean is threatened by severe changes such as the reduction in sea‐ice coverage and increased inflow of warmer Atlantic water. The latter is already altering the zooplankton community, highlighting the n…
View article: To Regulate or Not to Regulate: Assimilation of Dietary Fatty Acids in the Temperate Copepod Temora longicornis
To Regulate or Not to Regulate: Assimilation of Dietary Fatty Acids in the Temperate Copepod Temora longicornis Open
Consumer regulation of lipid composition during assimilation of dietary items is related to their ecology, habitat, and life cycle, and may lead to extra energetic costs associated with the conversion of dietary material into the fatty aci…
View article: Unexpected fish and squid in the central Arctic deep scattering layer
Unexpected fish and squid in the central Arctic deep scattering layer Open
The retreating ice cover of the Central Arctic Ocean (CAO) fuels speculations on future fisheries. However, very little is known about the existence of harvestable fish stocks in this 3.3 million–square kilometer ecosystem around the North…
View article: Seasonal and diel variations in the vertical distribution, composition, abundance and biomass of zooplankton in a deep Chilean Patagonian Fjord
Seasonal and diel variations in the vertical distribution, composition, abundance and biomass of zooplankton in a deep Chilean Patagonian Fjord Open
Comau Fjord is a stratified Chilean Patagonian Fjord characterized by a shallow brackish surface layer and a >400 m layer of aragonite-depleted subsurface waters. Despite the energetic burden of low aragonite saturation levels to calcifica…
View article: Effects of a Submesoscale Oceanographic Filament on Zooplankton Dynamics in the Arctic Marginal Ice Zone
Effects of a Submesoscale Oceanographic Filament on Zooplankton Dynamics in the Arctic Marginal Ice Zone Open
Submesoscale structures, characterized by intense vertical and horizontal velocities, potentially play a crucial role in oceanographic dynamics and pelagic fluxes. Due to their small spatial scale and short temporal persistence, conditions…
View article: Autonomous zooplankton profiler reveals high-Arctic zooplankton dynamics during transition to polar night
Autonomous zooplankton profiler reveals high-Arctic zooplankton dynamics during transition to polar night Open
<p>With rapid sea-ice decline, ocean warming and increasing Atlantic inflow, the ecosystem of the Central Arctic Ocean (CAO) is experiencing an unprecedented, potentially disruptive transformation. While this transformation is affect…
View article: Sea ice decline drives biogeographical shifts of key <i>Calanus</i> species in the central Arctic Ocean
Sea ice decline drives biogeographical shifts of key <i>Calanus</i> species in the central Arctic Ocean Open
In recent decades, the central Arctic Ocean has been experiencing dramatic decline in sea ice coverage, thickness and extent, which is expected to have a tremendous impact on all levels of Arctic marine life. Here, we analyze the regional …
View article: Aggregate Feeding by the Copepods Calanus and Pseudocalanus Controls Carbon Flux Attenuation in the Arctic Shelf Sea During the Productive Period
Aggregate Feeding by the Copepods Calanus and Pseudocalanus Controls Carbon Flux Attenuation in the Arctic Shelf Sea During the Productive Period Open
Up to 95% of the oceanic primary production is recycled within the upper few hundred meters of the water column. Marine snow and zooplankton fecal pellets in the upper water column are often recycled at rates exceeding those measured for m…
View article: Assimilation and turnover rates of lipid compounds in dominant Antarctic copepods fed with <sup>13</sup> C-enriched diatoms
Assimilation and turnover rates of lipid compounds in dominant Antarctic copepods fed with <sup>13</sup> C-enriched diatoms Open
The study revealed species- and stage-specific differences in lipid accumulation of the dominant Antarctic copepods, the primarily herbivorous Calanoides acutus (copepodite stage V (CV), females) and the more omnivorous Calanus propinquus …
View article: Review of the research knowledge and gaps on fish populations, fisheries and linked ecosystems in the Central Arctic Ocean (CAO)
Review of the research knowledge and gaps on fish populations, fisheries and linked ecosystems in the Central Arctic Ocean (CAO) Open
This report presents a review of the research knowledge and gaps on fish populations, fisheries and linked ecosystems in the Central Arctic Ocean (CAO). The CAO comprises the deep basins of the Arctic Ocean beyond the shelf break, which la…