The malacostracan fauna of two Arctic fjords (west Spitsbergen): the diversity and distribution patterns of its pelagic and benthic components

Legeżyńska, Joanna; Włodarska‐Kowalczuk, Maria; Głuchowska, Marta; Ormańczyk, Mateusz; Kędra, Monika; Węsławski, Jan Marcin

doi:10.1016/j.oceano.2017.01.004

Cited by 9 publications

(3 citation statements)

References 78 publications

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“…In contrast, previous studies reported a decline in species richness from the outer to the inner part of Kongsfjorden (e.g. Kedra et al, 2010;Voronkov et al, 2013;Legeżyńska et al, 2017). Also, trends of decreasing diversity when getting closer to the glaciers have been observed in other glacial-impacted regions such as Hornsund fjord (Włodarska-Kowalczuk et al, 2013) and the Canadian Arctic (Farrow et al, 1983).…”

Section: Discussionmentioning

confidence: 85%

Benthic diversity along an Arctic fjord: which are the key factors?

Lebrun,

Comeau,

Gazeau

et al. 2023

Preprint

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Arctic coastal ecosystems include benthic communities that hold an important role within the marine food chain. Kelps, fucoid species, and coralline algae dominate rocky habitats, offering food and shelter for various species. Kelps and fucoid species also aid in carbon sequestration, sediment stabilization, and erosion mitigation. In summer, the influx of freshwater from glacier and permafrost melt alters coastal waters conditions. The input of turbid freshwater influences underwater light, salinity, and substrate, impacting benthic organism distribution. This study investigates possible link between environmental conditions and benthic diversity through environmental DNA (eDNA). Six sites were monitored along Kongsfjorden (Svalbard, Norway) during the summer of 2021. Contrary to expectations, macroalgal distribution didn't correlate with light, and suspension feeders showed no clear links with chlorophyll a or nutrient concentrations. Glacial influence may have contributed to higher benthic diversity. Predators' presence, tied to glacier proximity, possibly explained this trend. However, further studies are needed to validate these observations and assumptions.

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Section: Discussionmentioning

confidence: 85%

Benthic diversity along an Arctic fjord: which are the key factors?

Lebrun,

Comeau,

Gazeau

et al. 2023

Preprint

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“…In general, the sediment accumulation rate in Svalbard is higher in the inner and lower in the outer parts of the fjords (e.g. Legeżyńska et al, 2017;Renaud et al, 2007) and changes over time. In the warmer periods (the Early Holocene and nowadays), the linear accumulation rate was greater (Sternal et al, 2012;Zajączkowski et al, 2004), whereas in the colder phases of the Holocene it was significantly lower (e.g.…”

Section: Early-middle Holocene Ice-free Straitmentioning

confidence: 98%

Holocene ice-free strait followed by dynamic Neoglacial fluctuations: Hornsund, Svalbard

2022

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The recession of the Hornbreen-Hambergbreen glaciers (Hornsund, Svalbard) will lead to the formation of a strait between the Greenland and Barents Seas within a few decades. We provide evidence for the earlier existence of this strait, in the Early–Middle Holocene and presumably since 1.3 ka cal. BP until glacier advance 0.7 ± 0.3 ka or earlier. Radiocarbon dating of mollusc shells from the ground moraines in the Hornbreen forefield indicate the existence of the marine environment at the contemporary glacierized head of Hornsund since 10.9 ka cal. BP or earlier due to glacier retreat. The gap in the radiocarbon dates between 3.9 and 1.3 ka cal. BP and the published results of 10Be exposure dating on Treskelen suggest the strait’s closure after glacier advance in the Neoglacial. Subsequent re-opening occurred around 1.3 ka cal. BP, but according to 10Be dates from Treskelen, the strait has again been closed since ca. 0.7 ± 0.3 ka or earlier. The oldest known surge of Hornbreen occurred around 1900. Analysis of Landsat satellite images, morphometric indicators characterizing the glacier frontal zones and previous studies indicate one surge of Hambergbreen (1957–1968) and five re-advances of Hornbreen in the 20th century (after 1936, between 1958 and 1962, in 1986–1990, 1998–1999, 2011). While the warmer Holocene intervals might be a benchmark for the effects of future climate change, glacier dynamics in post-Little Ice Age climate warming seems to be an analogue of glacier retreats and re-advances in the earlier periods of the Holocene.

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“…The further intensification of erosion in glaciated and periglacial areas leads to increased sediment [13] and nutrient transport [4,5,7]. The sediment delivered to fiords also impairs the diversity and productivity of bentic communities in the vicinity of glaciers [76]. Sediment yield from land-terminating glaciers also decreases the productivity of pelagic communities in the fiord [77,78].…”

Section: Future Changes In the Suspended Sediment Yields From Glaciermentioning

confidence: 99%

Which Drivers Control the Suspended Sediment Flux in a High Arctic Glacierized Basin (Werenskioldbreen, Spitsbergen)?

Łepkowska

Stachnik

2018

Water

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A unique data set of suspended sediment transport from the Breelva, which drains the Werenskioldbreen (Southwestern Spitsbergen), is reported for the period 2007–2012. This basin is thoroughly described hydrologically, glaciologically, and chemically. However, until now there was a lack of full recognition of mechanical denudation. This study extends the information on quantitative suspended sediment load (SSL), amounting to 37.30–130.94 kt per year, and also underlines the importance of its modification by high discharge events, triggered by intense snowmelt or heavy rainfall. The large floods during the hydrologically active season transported even 83% of the total SSL. The variability of the SSL is controlled by glacial storage and release mechanisms. Particularly interesting is the second half of the hydrologically active season when intense rainfall events plays a key role in shaping the sediment supply pattern. The main source of fine mineral matter is the basal moraine, drained by subglacial outflows. Their higher mobilization occurs when the hydrostatic pressure increases, often as a result of rainwater supply to the glacier system. An increasing precipitation trend for Hornsund fjord region determines a positive trend predicted for sediment flux.

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The malacostracan fauna of two Arctic fjords (west Spitsbergen): the diversity and distribution patterns of its pelagic and benthic components

Cited by 9 publications

References 78 publications

Benthic diversity along an Arctic fjord: which are the key factors?

Benthic diversity along an Arctic fjord: which are the key factors?

Holocene ice-free strait followed by dynamic Neoglacial fluctuations: Hornsund, Svalbard

Which Drivers Control the Suspended Sediment Flux in a High Arctic Glacierized Basin (Werenskioldbreen, Spitsbergen)?

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