Modern Foraminiferal Faunas of the Southwestern to Northern Iceland Shelf: Oceanographic and Environmental Controls

Reconstruction of Atlantic water variability during the Holocene in the western Barents Sea

“…3, 5) suggest an overall improvement of environmental conditions reflecting the continued increasing inflow of Atlantic water. This is further corroborated by the increase of the subpolar species C. neoteretis, which is associated with chilled Atlantic water in the Arctic region (Mackensen and Hald, 1988;Steinsund, 1994;Seidenkrantz, 1995), and M. barleeanus, an arctic-boreal species that prefers higher salinities (Hald and Steinsund, 1992;Jennings et al, 2004) and is associated with the presence of Atlantic-derived waters in the Arctic (Polyak et al, 2002). The increase of M. barleeanus is concurrent with the increasing TOC content within sediments with continued high percentage of fine-grained material (Fig.…”

“…M. barleeanus is reported to feed on organic detritus, which can be delivered with fine sediments from shallow areas and then deposited in local depocenters (Polyak et al, 2002). Furthermore, the increase of N. labradorica from 11 500 to 10 600 yr BP also supports an increased inflow of Atlantic water since this species is linked to the higher nutrient content of Atlantic-derived waters and oceanic fronts (Hald and Korsun, 1997;Rytter et al, 2002;Jennings et al, 2004;Lloyd, 2006). The pulse of Islandiella spp.…”

Atlantic Water advection vs. glacier dynamics in northern Spitsbergen since early deglaciation

“…The occurrence of C. neoteretis has been connected with a strong influence of AW in bottom waters because this species is assumed to respond to a limited temperature and salinity range as well as to an enhanced food supply (Jennings et al, 2004;Jennings and Helgadottir, 1994;Mackensen et al, 1985;Rytter et al, 2002;Seidenkrantz, 1995;Seidenkrantz et al, 2013;Steinsund, 1994). C. reniforme also prefers saline bottom waters (Hald and Korsun, 1997;Jennings et al, 2004) (Brassell et al, 1986;Müller et al, 1998). (b) Phytoplankton (brassicasterol)-IP 25 index (PIP 25 ); 0.3 to 0.5: reduced sea ice cover ( * ), 0.5 to 0.7: seasonal sea ice cover ( * * ), 0.7: extended to perennial sea ice cover ( * * * ) (Müller et al, 2011).…”

“…8d) during the late YD (e.g. Jennings et al, 2004;Rytter et al, 2002;Steinsund, 1994). As surface waters were consequently better insulated from relatively warm AW, SSTs probably fell again while sea ice expanded (see Fig.…”

Intra-annual Variability in Benthic Foraminiferal Abundance in Sediments of Disenchantment Bay, an Alaskan Glacial Fjord

“…Few studies have focused on Holocene foraminifera in coastal Alaska (Bergen and O'Neil, 1979;Quinterno et al, 1979;Echols and Armentrout, 1980); however, analysis of grab samples showed a reduction in the species diversity between open-marine Yakutat Bay (YB) and glacier-influenced DB (Echols and Armentrout, 1980). Observed taxa were dominated by those typical of highlatitude, glacier-proximal environments Hald, 1998, 2000;Hald and Korsun, 1997;Majewski, 2005;Jennings et al, 2004), including Elphidium excavatum f. clavatum, Elphidium frigidum, Elphidium subarcticum, and Textularia earlandi (Appendix). The purpose of this study is to describe variations in benthic foraminiferal abundance within fjord sediment on an annual time scale.…”