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norskBlar i forfatter "Bluhm, Bodil"
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Seafloor warm water temperature anomalies impact benthic macrofauna communities of a high-Arctic cold-water fjord
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-06-05)Amid the alarming atmospheric and oceanic warming rates taking place in the Arctic, western fjords around the Svalbard archipelago are experiencing an increased frequency of warm water intrusions in recent decades, causing ecological shifts in their ecosystems. However, hardly anything is known about their potential impacts on the until recently considered stable and colder northern fjords. We ... -
Sympagic fauna in and under Arctic pack ice in the annual sea ice system of the new Arctic Frontiers in Marine Science
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-19)A strong decline and thinning of the Arctic sea-ice cover over the past five decades has been documented. The former multiyear sea-ice system has largely changed to an annual system and with it the dynamics of sea-ice transport across the Arctic Ocean. Less sea ice is reaching the Fram Strait and more ice and ice-transported material is released in the northern Laptev Sea and the central Arctic ... -
Time-series benthic community composition and biomass and associated environmental characteristics in the Chukchi Sea during the RUSALCA 2004–2012 program
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-09)Benthic macrofaunal and epifaunal composition and biomass and associated environmental drivers were evaluated for time-series stations occupied during three cruises of the RUSALCA (Russian-American Long-term Census of the Arctic) program undertaken in August 2004, September 2009, and September 2012. We focus on the benthic communities collected at repeat stations in the southern Chukchi Sea and ... -
Towards a unifying pan-arctic perspective: A conceptual modelling toolkit
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-10-17)The Arctic Ocean is overwhelmingly forced by its lateral boundaries, and interacts with, the global system. For the development of nested conceptual models of the Arctic Ocean ecosystem we here choose the full pan-Arctic as our focal scale. Understanding the pan-Arctic scale, however, requires that we look at the underlying scales of its major components, by considering regionality, connectivity and ... -
Trait-based approaches in rapidly changing ecosystems: A roadmap to the future polar oceans
(Journal article; Tidsskriftartikkel; Peer reviewed, 2018-04-30)Polar marine regions are facing rapid changes induced by climate change, with consequences for local faunal populations, but also for overall ecosystem functioning, goods and services. Yet given the complexity of polar marine ecosystems, predicting the mode, direction and extent of these consequences remains challenging. Trait-based approaches are increasingly adopted as a tool by which to explore ... -
Under-ice observations by trawls and multi-frequency acoustics in the Central Arctic Ocean reveals abundance and composition of pelagic fauna
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-01-18)The rapid ongoing changes in the Central Arctic Ocean call for baseline information on the pelagic fauna. However, sampling for motile organisms which easily escape vertically towed nets is challenging. Here, we report the species composition and catch weight of pelagic fishes and larger zooplankton from 12 trawl hauls conducted in ice covered waters in the Central Arctic Ocean beyond the continental ... -
Uniform bathymetric zonation of marine benthos on a Pan-Arctic scale
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-02-19)While numerous regional studies of bathymetric zonation of benthic fauna globally have been done, few large-scale analyses exist, and no ocean-scale studies have focused on the Arctic Ocean to date. In the present work we, hence, examined bathymetric zonation of macro- and megabenthos over a depth range spanning from the shelf to the abyssal plain (14 – 5416 m) and regionally extending from the Fram ... -
Uptake of sympagic organic carbon by the Barents Sea benthos linked to sea ice seasonality
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-11-11)On Arctic shelves, where primary production occurs in both the pelagic and sympagic (ice-associated) habitats, sympagic organic material (OM) can constitute a disproportionate fraction of benthic diets due to higher sinking rates and lower grazing pressure than pelagic OM. Less documented is how sympagic OM assimilation across feeding guilds varies seasonally and in relation to sea ice duation. We ... -
Weak seasonality in benthic food web structure within an Arctic inflow shelf region
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-08-23)The Arctic Ocean is characterized by pronounced seasonality in the quantity and quality of organic matter exported from the surface ocean. While it is well established that changes in food availability can alter the abundance, biomass and function of benthic organisms, the impact on food web structure is not well studied. We used bulk carbon and nitrogen stable isotope analysis to assess the quantity ... -
What feeds the benthos in the Arctic basins? Assembling a carbon budget for the deep Arctic ocean
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-04-16)Half of the Arctic Ocean is deep sea (>1000 m), and this area is currently transitioning from being permanently ice-covered to being seasonally ice-free. Despite these drastic changes, it remains unclear how organisms are distributed in the deep Arctic basins, and particularly what feeds them. Here, we summarize data on auto- and heterotrophic organisms in the benthic, pelagic, and sympagic realm ... -
What we do in the dark: Prevalence of omnivorous feeding activity in Arctic zooplankton during polar night
(Journal article; Tidsskriftartikkel, 2023-07-04)During the productive polar day, zooplankton and sea-ice amphipods fulfill a critical role in energy transfer from primary producers to higher trophic-level species in Arctic marine ecosystems. Recent polar night studies on zooplankton and sea-ice amphipods suggest higher levels of biological activity than previously assumed. However, it is unknown if these invertebrates maintain polar night activity ...
