Distribution of dinocyst assemblages in surface sediment samples from the West Greenland margin

Estelle Allan; Anne de Vernal; Diana Krawczyk; Matthias Moros; Taoufik Radi; André Rochon; Marit Solveig Seidenkrantz; Sébastien Zaragosi

doi:10.1016/j.marmicro.2019.101818

Distribution of dinocyst assemblages in surface sediment samples from the West Greenland margin

Estelle Allan^*, Anne de Vernal, Diana Krawczyk, Matthias Moros, Taoufik Radi, André Rochon, Marit Solveig Seidenkrantz, Sébastien Zaragosi

^*Corresponding author af dette arbejde

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Tidsskriftartikel › Forskning › peer review

9 Citationer (Scopus)

Abstract

( )Palynological analyses of 60 surface sediment samples from West Greenland margin revealed high concentrations of dinoflagellate cysts (dinocysts), particularly in the Disko Bugt area, where they reach > 10(4) cysts g(-1). Dinocyst assemblages are characterized by a relatively high species diversity and are dominated by Operculodinium centrocarpum, cysts of Pentapharsodinium dalei, Islandinium minutum, Islandinium? cezare, and Brigantedinium spp. On a regional scale, the overall assemblages show statistical relationships with sea-ice cover duration, primary productivity, salinity and summer-fall temperature. The cysts of Pentapharsodinium dalei, Operculodinium centrocarpum, and Spiniferites elongatus appear linked to high productivity and to characterize the late summer-fall bloom. Although Islandinium minutum and Islandinium? cezare are generally associated with a seasonally sea-ice covered environment, there is no linear relationship between their relative abundance and seaice concentration or duration on a regional scale, along the West Greenland margin. The abundance of these taxa primarily reflects cold and low-salinity water in the study area. Radionuclide measurements (Pb-210 and Cs-137) allow the distinction between two categories of samples, the "modern" ones likely encompassing the interval younger than 1950 CE, and the others that may be considered "sub-modern". Statistical analyses indicate that dinocyst assemblages belonging to "modern" and "sub-modern" categories are not significantly different. Hence, the dinocyst assemblages of surface sediment samples, both "modern" and "sub-modern", represent fluxes homogenized over a relatively long time interval, which illustrates a spatial distribution corresponding to the main gradient in oceanographic conditions. Consequently, dinocyst assemblages in surface sediments can be assumed to represent the average "modern" conditions with a sufficiently high degree of confidence for their use in environmental studies and paleoclimate reconstructions.

Originalsprog	Engelsk
Artikelnummer	101818
Tidsskrift	Marine Micropaleontology
Vol/bind	159
Antal sider	19
ISSN	0377-8398
DOI	https://doi.org/10.1016/j.marmicro.2019.101818
Status	Udgivet - aug. 2020

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title = "Distribution of dinocyst assemblages in surface sediment samples from the West Greenland margin",

abstract = "( )Palynological analyses of 60 surface sediment samples from West Greenland margin revealed high concentrations of dinoflagellate cysts (dinocysts), particularly in the Disko Bugt area, where they reach > 10(4) cysts g(-1). Dinocyst assemblages are characterized by a relatively high species diversity and are dominated by Operculodinium centrocarpum, cysts of Pentapharsodinium dalei, Islandinium minutum, Islandinium? cezare, and Brigantedinium spp. On a regional scale, the overall assemblages show statistical relationships with sea-ice cover duration, primary productivity, salinity and summer-fall temperature. The cysts of Pentapharsodinium dalei, Operculodinium centrocarpum, and Spiniferites elongatus appear linked to high productivity and to characterize the late summer-fall bloom. Although Islandinium minutum and Islandinium? cezare are generally associated with a seasonally sea-ice covered environment, there is no linear relationship between their relative abundance and seaice concentration or duration on a regional scale, along the West Greenland margin. The abundance of these taxa primarily reflects cold and low-salinity water in the study area. Radionuclide measurements (Pb-210 and Cs-137) allow the distinction between two categories of samples, the {"}modern{"} ones likely encompassing the interval younger than 1950 CE, and the others that may be considered {"}sub-modern{"}. Statistical analyses indicate that dinocyst assemblages belonging to {"}modern{"} and {"}sub-modern{"} categories are not significantly different. Hence, the dinocyst assemblages of surface sediment samples, both {"}modern{"} and {"}sub-modern{"}, represent fluxes homogenized over a relatively long time interval, which illustrates a spatial distribution corresponding to the main gradient in oceanographic conditions. Consequently, dinocyst assemblages in surface sediments can be assumed to represent the average {"}modern{"} conditions with a sufficiently high degree of confidence for their use in environmental studies and paleoclimate reconstructions.",

keywords = "Dinocysts, Primary production, Sea-surface conditions, West Greenland",

author = "Estelle Allan and {de Vernal}, Anne and Diana Krawczyk and Matthias Moros and Taoufik Radi and Andr{\'e} Rochon and Seidenkrantz, {Marit Solveig} and S{\'e}bastien Zaragosi",

year = "2020",

month = aug,

doi = "10.1016/j.marmicro.2019.101818",

language = "English",

volume = "159",

journal = "Marine Micropaleontology",

issn = "0377-8398",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Distribution of dinocyst assemblages in surface sediment samples from the West Greenland margin

AU - Allan, Estelle

AU - de Vernal, Anne

AU - Krawczyk, Diana

AU - Moros, Matthias

AU - Radi, Taoufik

AU - Rochon, André

AU - Seidenkrantz, Marit Solveig

AU - Zaragosi, Sébastien

PY - 2020/8

Y1 - 2020/8

N2 - ( )Palynological analyses of 60 surface sediment samples from West Greenland margin revealed high concentrations of dinoflagellate cysts (dinocysts), particularly in the Disko Bugt area, where they reach > 10(4) cysts g(-1). Dinocyst assemblages are characterized by a relatively high species diversity and are dominated by Operculodinium centrocarpum, cysts of Pentapharsodinium dalei, Islandinium minutum, Islandinium? cezare, and Brigantedinium spp. On a regional scale, the overall assemblages show statistical relationships with sea-ice cover duration, primary productivity, salinity and summer-fall temperature. The cysts of Pentapharsodinium dalei, Operculodinium centrocarpum, and Spiniferites elongatus appear linked to high productivity and to characterize the late summer-fall bloom. Although Islandinium minutum and Islandinium? cezare are generally associated with a seasonally sea-ice covered environment, there is no linear relationship between their relative abundance and seaice concentration or duration on a regional scale, along the West Greenland margin. The abundance of these taxa primarily reflects cold and low-salinity water in the study area. Radionuclide measurements (Pb-210 and Cs-137) allow the distinction between two categories of samples, the "modern" ones likely encompassing the interval younger than 1950 CE, and the others that may be considered "sub-modern". Statistical analyses indicate that dinocyst assemblages belonging to "modern" and "sub-modern" categories are not significantly different. Hence, the dinocyst assemblages of surface sediment samples, both "modern" and "sub-modern", represent fluxes homogenized over a relatively long time interval, which illustrates a spatial distribution corresponding to the main gradient in oceanographic conditions. Consequently, dinocyst assemblages in surface sediments can be assumed to represent the average "modern" conditions with a sufficiently high degree of confidence for their use in environmental studies and paleoclimate reconstructions.

AB - ( )Palynological analyses of 60 surface sediment samples from West Greenland margin revealed high concentrations of dinoflagellate cysts (dinocysts), particularly in the Disko Bugt area, where they reach > 10(4) cysts g(-1). Dinocyst assemblages are characterized by a relatively high species diversity and are dominated by Operculodinium centrocarpum, cysts of Pentapharsodinium dalei, Islandinium minutum, Islandinium? cezare, and Brigantedinium spp. On a regional scale, the overall assemblages show statistical relationships with sea-ice cover duration, primary productivity, salinity and summer-fall temperature. The cysts of Pentapharsodinium dalei, Operculodinium centrocarpum, and Spiniferites elongatus appear linked to high productivity and to characterize the late summer-fall bloom. Although Islandinium minutum and Islandinium? cezare are generally associated with a seasonally sea-ice covered environment, there is no linear relationship between their relative abundance and seaice concentration or duration on a regional scale, along the West Greenland margin. The abundance of these taxa primarily reflects cold and low-salinity water in the study area. Radionuclide measurements (Pb-210 and Cs-137) allow the distinction between two categories of samples, the "modern" ones likely encompassing the interval younger than 1950 CE, and the others that may be considered "sub-modern". Statistical analyses indicate that dinocyst assemblages belonging to "modern" and "sub-modern" categories are not significantly different. Hence, the dinocyst assemblages of surface sediment samples, both "modern" and "sub-modern", represent fluxes homogenized over a relatively long time interval, which illustrates a spatial distribution corresponding to the main gradient in oceanographic conditions. Consequently, dinocyst assemblages in surface sediments can be assumed to represent the average "modern" conditions with a sufficiently high degree of confidence for their use in environmental studies and paleoclimate reconstructions.

KW - Dinocysts

KW - Primary production

KW - Sea-surface conditions

KW - West Greenland

UR - http://www.scopus.com/inward/record.url?scp=85077709124&partnerID=8YFLogxK

U2 - 10.1016/j.marmicro.2019.101818

DO - 10.1016/j.marmicro.2019.101818

M3 - Journal article

AN - SCOPUS:85077709124

SN - 0377-8398

VL - 159

JO - Marine Micropaleontology

JF - Marine Micropaleontology

M1 - 101818

ER -

Distribution of dinocyst assemblages in surface sediment samples from the West Greenland margin

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