The environmental and climatic distribution of dinoflagellate cysts in modern marine sediments from regions in the North and South Atlantic Oceans and adjacent seas

Wall, David; Dale, Barrie; Lohmann, G. P.; Smith, Woollcott

doi:10.1016/0377-8398(77)90008-1

Cited by 609 publications

(347 citation statements)

References 40 publications

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“…The dinoflagellates that make the cysts inhabit surface waters, dominantly in marginal marine settings [Wall et al, 1977;Bradford and Wall, 1984;Fensome et al, 1996]. The nearshore setting is also where dinocyst preservation is best because shallow sediments are often reduced.…”

Section: Sea Level Indicatorsmentioning

confidence: 99%

“…Individual species are very sensitive to differences in surface water properties [Taylor, 1987;Dale, 1996]. Consequently, dinocyst assemblages exhibit systematic variation across the seafloor from the coast to open water [Wall et al, 1977;Harland, 1983;Bradford and Wall, 1984;Marret and Zonneveld, 2003]. This inshore-offshore variance has been documented in sediment deposited across continental margins of the past, including the Paleogene when shelf areas were more expansive than at present [Köthe, 1990;Brinkhuis, 1994;Pross and Brinkhuis, 2005].…”

Section: Sea Level Indicatorsmentioning

confidence: 99%

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Eustatic variations during the Paleocene‐Eocene greenhouse world

et al. 2008

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[1] We reconstruct eustatic variations during the latest Paleocene and earliest Eocene ($58-52 Ma). Dinoflagellate cysts, grain size fractions, and organic biomarkers in marine sections at four sites from three continents indicate an increased distance to the coast during the Paleocene-Eocene thermal maximum (PETM). The same trend is recognized in published records from other sites around the world. Together, the data indicate a eustatic rise during the PETM, beginning 20 to 200 ka before the globally recorded negative carbon isotope excursion (CIE) at $55.5 Ma. Although correlations are tentative, we recognize other global transgressions during Chrons C25n and C24n. The latter may be associated with Eocene Thermal Maximum 2 ($53.5 Ma) or the ''X''-event ($52 Ma). These results suggest a link between global sea level and ''hyperthermal'' intervals, potentially because of the melting of small alpine ice sheets on Antarctica, thermal expansion of seawater, or both. However, the early onset of sea level rise relative to the CIE of the PETM suggests contributions from other mechanisms, perhaps decreasing ocean basin volume, on sea level rise.

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Section: Sea Level Indicatorsmentioning

confidence: 99%

Section: Sea Level Indicatorsmentioning

confidence: 99%

Eustatic variations during the Paleocene‐Eocene greenhouse world

et al. 2008

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“…Studies of dinocysts recovered from surface sediments of the Southwest Atlantic are scarce. Offshore the Río de la Plata a pioneer dinocyst record was obtained in a NW-SE transect (36-39°S) between 500 and 5000 m depth (Wall et al, 1977). Other records are available from the northern Argentine Shelf (Akselman, 1999;Borel et al, 2012) and only two studies exist from the Patagonian Shelf (Akselman, 1987;Orozco and Carreto, 1989).…”

Section: Introductionmentioning

confidence: 99%

Analysis of the hydrographic conditions and cyst beds in the San Jorge Gulf, Argentina, that favor dinoflagellate population development including toxigenic species and their toxins

Krock

Borel

Barrera

et al. 2015

Journal of Marine Systems

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The overlay of cooler nutrient enriched Beagle-Magellan water with warmer nutrient depleted shelf water and a strong stratification of the water column in the San Jorge Gulf region, Argentina, coincided with relatively high dinoflagellate abundances in April 2012, up to 34,000 cells L −1 . This dinoflagellate proliferation was dominated by Ceratium spp., but environmental conditions also favored to a lesser amount the occurrence of toxigenic dinoflagellates, such as Alexandrium tamarense and Protoceratium reticulatum, whose toxins were hardly detected in any other areas along the expedition transect of the R/V Puerto Deseado between 38 and 56°S (Ushuaia-Mar del Plata) in March/April 2012. Generally vegetative cells of A. tamarense and P. reticulatum co-occurred with their respective phycotoxins in the water column and their cysts in the upper sediment layers. Two strains of A. tamarense were isolated from the bloom sample and morphologically characterized. Their PSP toxin profiles consisted of C1/2, gonyautoxins 1/4 and to a lesser amount of neosaxitoxin and confirmed earlier data from this region. The ratios between autotrophic picoplankton and heterotrophic bacteria were higher in shelf waters in the north than in Beagle-Magellan waters in the south of San Jorge Gulf.

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“…An example is Operculodinium centrocarpum, the cyst of Gonyaulax grindleyi. This is a dominant form in temperate coastal sediments, but it has been only only infrequently reported from the water column (Wall et al 1977, Harland 1988, Mudie & Harland 1996 and only once seen to bloom (in Puget Sound, off the coast of Washington: pers. comm.…”

Section: Position and Frequency Of Resting Cysts In The Water Columnmentioning

confidence: 99%