Phytoplankton community in the Western Arctic in July–August 2003

The Pacific Arctic Region

“…These have been identifi ed as (i) Anadyr Water (AW) in the west, (ii) Bering Shelf (BS) water in the center (iii) Alaska Coastal Water (ACW) in the east (see Maslowski et al, this volume, for more detail). The seasonal progression of the phytoplankton shows a similar pattern to the Bering Sea, with spring and summer assemblages driven by local patterns in warming, ice melt, stratifi cation and nutrient supply (Sergeeva et al 2010 ). The seasonal progression of the phytoplankton shows a similar pattern to the Bering Sea, with spring and summer assemblages driven by local patterns in warming, ice melt, stratifi cation and nutrient supply (Sergeeva et al 2010 ).…”

The community composition of diatom resting stages in sediments of the northern Bering Sea in 2017 and 2018: the relationship to the interannual changes in the extent of the sea ice

“…In the Arctic Ocean, it is known that C. socialis s. l. and Thalassiosira spp. dominate in phytoplankton blooms (von Quillfeldt 2000;Sukhanova et al 2009;Sergeeva et al 2010). Distribution of resting stages in sediment is greatly affected by the distribution of phytoplankton in the water column (Pitcher 1990).…”

Sediment Geochemistry and Diatom Distribution in the Chukchi Sea: Application for Bioproductivity and Paleoceanography

“…The selective solubility of diatoms leads to the formation of peculiar assemblages in sediments, featuring the absence of some typical biocoenosis species and the relative abundance of others that are better preserved in sediments (Jousé, 1962). Bacterosira bathyomphala, Pauliella taeniata, and Chaetoceros socialis are the dominant plankton in the Chukchi Sea (Sergeeva et al, 2010), but their content in sediments seldom exceeds 10%. Nevertheless, the diatom assemblages found in the sediments reliably reflect the main oceanography and ice conditions of the Chukchi Sea and can be used to reconstruct the paleoenvironment.…”

“…The diatom assemblage related to the Herald Valley sediments (cluster B2-2b) consists of two species typical for both western cold-water and eastern warmwater areas (Paralia sulcata, Thalassiosira antarctica), with Chaetoceros species dominating (up to 54%; Figure 7f). Generally, these species are indicative of highly productive and Fe-rich surface waters (Ren et al, 2014). Additional oceanic diatom species, amounting to as much as 12% of the total diatom flora, found in the Chukchi Sea include Coscinodiscus oculus-iridis (Ehrenberg) Ehrenberg, Rhizosolenia hebetate Bailey, Actinocyclus curvatulus Janisch, Thalassiothrix longissima Cleve et Grunow, Coscinodiscus radiatus Ehrenberg, and Thalassiosira eccentrica (Ehrenberg) Cleve.…”