Surface sediment dinoflagellate cysts from the Hudson Bay system and their relation to freshwater and nutrient cycling

Heikkilä, Maija; Pospelova, Vera; Hochheim, Klaus P.; Kuzyk, Zou Zou A.; Stern, Gary A.; Barber, David G.; Macdonald, Robie W.

doi:10.1016/j.marmicro.2013.12.002

Cited by 64 publications

(52 citation statements)

References 157 publications

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“…It is mainly used as a proxy for siliceous microfossil abundance, and it has been shown to be a useful proxy for diatom abundance and productivity in aquatic systems (Conley and Schelske 2001). Measurements of BSi from marine sediments in the Arctic region are quite scarce, but BSi concentrations in the surface Young Sound sediments are comparable to those (<2%) measured from the Greenland Sea (Schlüter and Sauter 2000), and appear to be low compared to the study by Heikkilä et al (2014) in surface sediment from the Hudson Bay system (2–11%).…”

Section: Resultssupporting

confidence: 52%

Sea ice and primary production proxies in surface sediments from a High Arctic Greenland fjord: Spatial distribution and implications for palaeoenvironmental studies

Ribeiro¹,

Sejr²,

Limoges³

et al. 2017

Ambio

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In order to establish a baseline for proxy-based reconstructions for the Young Sound–Tyrolerfjord system (Northeast Greenland), we analysed the spatial distribution of primary production and sea ice proxies in surface sediments from the fjord, against monitoring data from the Greenland Ecosystem Monitoring Programme. Clear spatial gradients in organic carbon and biogenic silica contents reflected marine influence, nutrient availability and river-induced turbidity, in good agreement with in situ measurements. The sea ice proxy IP25 was detected at all sites but at low concentrations, indicating that IP25 records from fjords need to be carefully considered and not directly compared to marine settings. The sea ice-associated biomarker HBI III revealed an open-water signature, with highest concentrations near the mid-July ice edge. This proxy evaluation is an important step towards reliable palaeoenvironmental reconstructions that will, ultimately, contribute to better predictions for this High Arctic ecosystem in a warming climate.

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Section: Resultssupporting

confidence: 52%

Sea ice and primary production proxies in surface sediments from a High Arctic Greenland fjord: Spatial distribution and implications for palaeoenvironmental studies

Ribeiro¹,

Sejr²,

Limoges³

et al. 2017

Ambio

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“…This atypical pattern is robustly observed in all the three Norwegian Sea sequences, despite distinct physiographical contexts, and strongly expressed in the 63 • N cores. At this latitude, SST is systematically anti-correlated against Greenland and North Atlantic temperatures (Table 3), and shows large positive mean annual anomalies in GS compared to GI from +1.7 • C (MD95-2009) to +3.7 • C (MD99-2285) Rochon et al, 1999;Radi et al, 2013;Heikkilä et al, 2014Heikkilä et al, , 2016. Previous palaeoclimatic studies (e.g.…”

Section: Resultsmentioning

confidence: 78%

Regional seesaw between the North Atlantic and Nordic Seas during the last glacial abrupt climate events

et al. 2017

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Abstract. Dansgaard-Oeschger oscillations constitute one of the most enigmatic features of the last glacial cycle. Their cold atmospheric phases have been commonly associated with cold sea-surface temperatures and expansion of sea ice in the North Atlantic and adjacent seas. Here, based on dinocyst analyses from the 48-30 ka interval of four sediment cores from the northern Northeast Atlantic and southern Norwegian Sea, we provide direct and quantitative evidence of a regional paradoxical seesaw pattern: cold Greenland and North Atlantic phases coincide with warmer sea-surface conditions and shorter seasonal sea-ice cover durations in the Norwegian Sea as compared to warm phases. Combined with additional palaeorecords and multi-model hosing simulations, our results suggest that during cold Greenland phases, reduced Atlantic meridional overturning circulation and cold North Atlantic sea-surface conditions were accompanied by the subsurface propagation of warm Atlantic waters that reemerged in the Nordic Seas and provided moisture towards Greenland summit.

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“…In general, the dinoflagellate cyst concentrations in sediments correspond to the abundance of their motile populations in overlying waters (Harland and Pudsey 1999, Dale 2001, Mudie et al 2002, Pospelova et al 2005, Wang et al 2007, Heikkilä et al 2014). The long-term monitoring in Amur Bay showed that S. trochoidea was a common and abundant component of the phytoplankton during the spring-autumn period, reaching 20 000 cells l -1 at station 1 and even a million cells l -1 during blooms ).…”

Section: Distributionmentioning

confidence: 99%

Scrippsiella trochoidea cysts in recent sediments from Amur Bay, Sea of Japan: distribution and phylogeny

Morozova

Orlova

Efimova³

et al. 2016

Botanica Marina

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A study of vertical distribution of dinoflagellate cysts in recent sediments was conducted for the first time in the Far Eastern seas of Russia. Dinoflagellate cysts were studied in sediment cores retrieved from five stations in Amur Bay (Peter the Great Bay, Sea of Japan) in 2010 and 2013. The Scrippsiella trochoidea complex was the dominant type of cyst, the average proportion of which (in the entire sediment cores) reached 39% of the total cyst abundance. The maximum abundance of S. trochoidea complex reached 5513 cysts g -1 dry sediment. Cysts of the S. trochoidea complex were found to remain viable in the sediments after exposure to sub-zero temperatures. The identification of S. trochoidea in the Far Eastern seas of Russia was first confirmed by using biomolecular genetic analyses. The study of vertical distribution showed that cysts of this species dominate the upper sediment layers (0-10 cm). A tendency for abundance to increase from the shore toward the middle part of the bay was observed in the spatial distribution of cysts.

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Surface sediment dinoflagellate cysts from the Hudson Bay system and their relation to freshwater and nutrient cycling

Cited by 64 publications

References 157 publications

Sea ice and primary production proxies in surface sediments from a High Arctic Greenland fjord: Spatial distribution and implications for palaeoenvironmental studies

Sea ice and primary production proxies in surface sediments from a High Arctic Greenland fjord: Spatial distribution and implications for palaeoenvironmental studies

Regional seesaw between the North Atlantic and Nordic Seas during the last glacial abrupt climate events

Scrippsiella trochoidea cysts in recent sediments from Amur Bay, Sea of Japan: distribution and phylogeny

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