Seasonal Cruise Q3

Reigstad, Marit; Gabrielsen, Tove M.; Amargant, Marti; Amundsen, Rita; Bluhm, Bodil A.; Bodur, Yasemin; Bremnes, Jan; Brun, Nadja R.; Dalpadao, Padmini; Dmoc, Kasia; Edvardsen, Bente; Garnett, Jack; Gawinski, Christine; Giebichenstein, Julia; Haarr, Ane; Hoff, Siv Nam Khang; Jorda, Eric; Karlsson, Konrad; Kohler, Stephen Gustav; Leithe, Jon; Marquardt, Miriam; Morel, Christian; Müller, Oliver; Liholt, Håvard N.; Nordstrand, Jan Vidar; Nowicki, Robynne; Olsen, Lasse Mork; Ortiz, Griselda Anglada; Pedersen, Ronald; Sánchez, Nicolás; Saubrekka, Karoline; Sen, Arunima; Stige, Leif Christian; Stippkugel, Angela; Vader, Anna; Wold, Anette; Yadetie, Fekadu

doi:10.7557/nlrs.6407

Cited by 6 publications

(1 citation statement)

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“…This area is frequently characterized by major sea-ice melt events, as sea-ice coverage regularly extends [ 25 ] into the WSC, which carries temperate species towards the CAO. Thus, ecosystem functionality in the vicinity of the MIZ in the WSC might serve as a model for future biodiversity and ecosystem functionality in a seasonally ice-free CAO impacted by Atlantification and thereby inform on the potential of temperate taxa to thrive in a seasonally ice-covered Atlantic-influenced Ocean [ 8 , 26-28 ].…”

Section: Introductionmentioning

confidence: 99%

Sea-ice melt determines seasonal phytoplankton dynamics and delimits the habitat of temperate Atlantic taxa as the Arctic Ocean atlantifies

Oldenburg,

Popa,

Wietz

et al. 2024

ISME Communications

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The Arctic Ocean is one of the regions where anthropogenic environmental change is progressing most rapidly and drastically. The impact of rising temperatures and decreasing sea ice on Arctic marine microbial communities is yet not well understood. Microbes form the basis of food webs in the Arctic Ocean, providing energy for larger organisms. Previous studies have shown that Atlantic taxa associated with low light are robust to more polar conditions. We compared to which extent sea ice melt influences light-associated phytoplankton dynamics and biodiversity over two years at two mooring locations in the Fram Strait. One mooring is deployed in pure Atlantic water, and the second in the intermittently ice-covered Marginal Ice Zone. Time-series analysis of amplicon sequence variants abundance over a two-year period, allowed us to identify communities of co-occurring taxa that exhibit similar patterns throughout the annual cycle. We then examined how alterations in environmental conditions affect the prevalence of species. During high abundance periods of diatoms, polar phytoplankton populations dominated, while temperate taxa were weakly represented. Furthermore, we found that polar pelagic and ice-associated taxa, such as Fragilariopsis cylindrus and Melosira arctica, were more common in Atlantic conditions, while temperate taxa, such as Odontella aurita and Proboscia alata, were less abundant. This suggests that sea ice melt may act as a barrier to the northward expansion of temperate phytoplankton, preventing their dominance in regions still strongly influenced by polar conditions. Our findings highlight the complex interactions between sea ice melt, phytoplankton dynamics, and biodiversity in the Arctic.

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Section: Introductionmentioning

confidence: 99%