Impact of shelf-transformed waters (STW) on foraminiferal assemblages in the outwash and glacial fjords of Adventfjorden and Hornsund, Svalbard

Szymańska, Natalia; Pawłowska, Joanna; Kucharska, Małgorzata; Kujawa, Agnieszka; Łącka, Magdalena; Zajączkowski, Marek

doi:10.1016/j.oceano.2017.04.006

Cited by 13 publications

(13 citation statements)

References 35 publications

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“…Its ecological requirements are not well constrained, however a related species, S. biformis, is known to tolerate severe dysoxia and to respond positively to increased nutrient availability in the Norwegian Drammensfjord (Alve, 1991;Gross, 2000). Szymańska et al (2017) found it to be the most abundant genus in the Adventfjorden and Hornsund fjords of Svalbard, whilst it is also a common occupant of seep environments (Bernhard et al, 2001;McGann and Conrad, 2018). The epiphytic R. bradyi and G. praegeri have previously been observed together with CWCs at BRI (Stalder et al, 2015(Stalder et al, , 2018.…”

Section: The Early Greenland Interstadial 1 Transition Between Greenlmentioning

confidence: 98%

Cold-Water Coral Mound Archive Provides Unique Insights Into Intermediate Water Mass Dynamics in the Alboran Sea During the Last Deglaciation

et al. 2020

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The Alboran Sea is widely recognized to host numerous cold-water coral ecosystems, including the East Melilla Coral Province. Yet, their development through time and response to climatic variability has still to be fully understood. Based on a combined investigation of benthic foraminiferal assemblages, foraminiferal stable isotope compositions, grain size analysis, sediment geochemistry, and macrofaunal quantification, this study identifies key events and processes having governed coldwater coral development at the East Melilla Coral Province between Greenland Stadial 2.1 and the Early Holocene. The transition from Greenland Stadial 2.1 to Greenland

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Section: The Early Greenland Interstadial 1 Transition Between Greenlmentioning

confidence: 98%

Cold-Water Coral Mound Archive Provides Unique Insights Into Intermediate Water Mass Dynamics in the Alboran Sea During the Last Deglaciation

et al. 2020

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“…Majewski and Zajączkowski (2007) suggested that the dissolution of calcareous tests was due to a low pH; however, the latter was not confirmed by further studies (e.g. Pawłowska et al 2017).…”

Section: Discussionmentioning

confidence: 96%

“…The observations from Hornsund (Zajączkowski et al 2010b) and Adventfjorden (Szymańska et al 2017) showed that for selected taxa, the depth of maximum abundance is likely to be fixed, e.g. for E. clavatum it is ca.…”

Section: Discussionmentioning

confidence: 99%

Seasonal changes in foraminiferal assemblages along environmental gradients in Adventfjorden (West Spitsbergen)

et al. 2018

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Foraminifera are numerically abundant components of the benthic fauna; thus, they are very important compounds in glaciomarine environments. However, ongoing oceanographic changes may influence their distribution, abundances and diversity differently at different times of the year. In the present study, we aimed to assess seasonal environmental changes in an Arctic fjord (Adventfjorden, W Spitsbergen) and the structure and distribution of benthic foraminiferal assemblages during four seasons (January, May, August, November). The study revealed that the benthic foraminiferal assemblages in Adventfjorden are susceptible to environmental changes related to enhanced inflow of shelf-transformed water (STW). We distinguished three zones in the fjord: (1) the deeper outer part influenced by STW, with living specimens staying in the few uppermost layers of sediment, (2) the shallower interior influenced by freshwater outflows and high sediment load, resulting in the dominance of opportunistic glaciomarine taxa constantly buried in the sediment, and (3) the central part, where the seasonal variation in the foraminifera assemblage reflects the interplay between the influence of riverine inputs and STW. Our study also revealed that the presence of STW in Adventfjorden favours an early spring appearance of juvenile foraminifera; however, the majority of the specimens are later withered and do not contribute to the summer pool of mature individuals. On the other hand, the majority of the mature specimens can survive during the winter because of sufficient organic matter stocks and year-long ice-free conditions.

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“…The length of the corer was 30 cm, but the upper 10 cm was used in our analysis. Such length is advised to represent multi-seasonal foraminiferal assemblages and to analyse deep-dwelling species (Jorissen, 1999;Kucharska et al, 2019;Szymańska et al, 2017). Water depth during sampling varied from 180 to 300 m (Table 1).…”

Section: Samplingmentioning

confidence: 99%

Foraminifera‐derived carbon contribution to sedimentary inorganic carbon pool: A case study from three Norwegian fjords

et al. 2021

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Norwegian fjords have been recently recognized as hot spots for carbon burial due to the large amounts of terrestrial organic matter delivered to fjord sediments, as well as the high sediment accumulation rates. Here, we present the first data on the contribution of benthic foraminiferal inorganic carbon to the sediments of three Norwegian fjords. Our study shows that calcareous foraminifera, which are among the most abundant calcifying organisms in the modern global oceans, can constitute between 15% and 33% of inorganic carbon accumulated in the sediments of the two studied southern Norwegian fjords (Raunefjorden and Hjeltefjorden). In a northern Norwegian fjord (Balsfjorden), the contribution of calcareous foraminifera to the inorganic carbon pool is smaller (<1%) than the one observed in southern fjords. We also found that the amount of foraminifera-derived carbon is primarily dependent on the species composition of the foraminifera community. Large calcareous foraminifera species, despite a lower number of individuals, constitute, on average, 13%-29% of the inorganic carbon in the two southern Norwegian fjords, while the contribution of small, highly abundant species does not exceed 4% of the inorganic carbon pools in the sediments. Calcareous foraminifera species that are indicative of dysoxic conditions have been found to have low inorganic carbon contents per specimen compared to other analysed similar-sized calcareous foraminifera species. This relationship most likely exists due to the thin test walls of these foraminifera species, which may facilitate gas exchange. The results of our case study suggest that the climate-driven formation of near-bottom low-oxygen zones may lead to the dominance of foraminifera associated with dysoxic conditions and, in consequence, to the decrease of foraminifera-derived inorganic carbon. However, to properly analyse the contribution of carbon from thin-walled foraminifera to the sedimentary carbon pool, further studies analysing a broader range of these species is needed.

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Impact of shelf-transformed waters (STW) on foraminiferal assemblages in the outwash and glacial fjords of Adventfjorden and Hornsund, Svalbard

Cited by 13 publications

References 35 publications

Cold-Water Coral Mound Archive Provides Unique Insights Into Intermediate Water Mass Dynamics in the Alboran Sea During the Last Deglaciation

Cold-Water Coral Mound Archive Provides Unique Insights Into Intermediate Water Mass Dynamics in the Alboran Sea During the Last Deglaciation

Seasonal changes in foraminiferal assemblages along environmental gradients in Adventfjorden (West Spitsbergen)

Foraminifera‐derived carbon contribution to sedimentary inorganic carbon pool: A case study from three Norwegian fjords

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