The biogeography of major diatom taxa in Southern Ocean sediments: 2. Open ocean related species

Crosta, Xavier; Romero, Oscar E; Armand, Leanne K.; Pichon, Jean‐Jacques

doi:10.1016/j.palaeo.2005.03.028

Cited by 201 publications

(229 citation statements)

References 63 publications

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“…Diatom assemblages from AND-1B provide three lines of evidence for the onset of Pliocene cooling at 3.2 Ma, in the heart of the PRISM warm interval: 1) abundance of Chaetoceros resting spores; 2) radiation of new species within the Fragilariopsis genus; and 3) environmental affinities of well-characterized extant species Crosta et al, 2005;Romero et al, 2005). In addition, environmental preferences for some extinct species common in AND-1B late Pliocene assemblages have Southern Ocean distributions that mirror extant environmental groupings (Abelmann et al, 1990;Barron, 1996a,b;Winter et al, 2010), providing support for environmental interpretations where extant species abundance is low.…”

Section: Discussionmentioning

confidence: 99%

“…The extant diatom assemblage is divided into four environmental groupings: 1) sea iceaffiliated species; 2) open ocean, ice-tolerant species; 3) open ocean, ice-intolerant species; and 4) subantarctic open ocean species. Ecological designations follow the comprehensive three part biogeographic investigation of Armand et al (2005), Crosta et al (2005), and Romero et al (2005), with constraints for two additional species from Zielinski and Gersonde (1997) and Armand (1997) (Fig. 6).…”

Section: Discussionmentioning

confidence: 99%

“…Temperature ranges and preferences for Chaetoceros resting spores and sea ice-affiliated species after Armand et al (2005), except E. antarctica, which comes from Zielinski and Gersonde (1997). Temperature ranges and preferences for open ocean species after Crosta et al (2005), where species marked with an asterisk (*) are members of broader taxon groups. That publication identifies "preferred" SSTs in the text but provides extended temperature ranges in a table, and both data sets are presented here.…”

Section: Discussionmentioning

confidence: 99%

“…A single apex of Trichotoxon reinboldii is also identified from DU IX. Crosta et al (2005) sometimes lump multiple similar species or forms into "species groupings" (i.e., "Rhizosolenia pointed group"); individual constituent species are identified here. In this analysis, three "cool open ocean" and three "pelagic open ocean" taxa of Crosta et al (2005) are considered together: although "cool open ocean" species are identified within the maximum winter sea ice edge and "pelagic open ocean" are identified at the APF, all six exhibit a tolerance for low concentrations of summer sea ice.…”

Section: Discussionmentioning

confidence: 99%

“…Two ice-intolerant open ocean species, Stellarima stellaris and Thalassionema nitzschioides (Armand, 1997;Crosta et al, 2005), comprise the third ecological grouping in AND-1B. This group is present in similar abundance at 3.2 Ma (average 1.2%, maximum5%) and 3.03 Ma (average 1.1%, maximum 3%).…”

Section: Discussionmentioning

confidence: 99%

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Diatom evidence for the onset of Pliocene cooling from AND-1B, McMurdo Sound, Antarctica

Riesselman

Dunbar

2013

Palaeogeography, Palaeoclimatology, Palaeoecology

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Diatom evidence for the onset of Pliocene cooling from AND-1B, McMurdo Sound, Antarctica

Riesselman

Dunbar

2013

Palaeogeography, Palaeoclimatology, Palaeoecology

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High‐latitude forcing of diatom productivity in the southern Agulhas Plateau during the past 350 kyr

et al. 2015

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The hydrography of the Indian-Atlantic Ocean gateway has been connected to high-latitude climate dynamics by oceanic and atmospheric teleconnections on orbital and suborbital timescales. A wealth of sedimentary records aiming at reconstructing the late Pleistocene paleoceanography around the southern African continent has been devoted to understanding these linkages. Most of the records are, however, clustered close to the southern South African tip, with comparatively less attention devoted to areas under the direct influence of frontal zones of the Southern Ocean/South Atlantic. Here we present data of the composition and concentration of the diatom assemblage together with bulk biogenic content and the alkenone-based sea surface temperature (SST) variations for the past 350 kyr in the marine sediment core MD02-2588 (approximately 41°S, 26°E) recovered from the southern Agulhas Plateau. Variations in biosiliceous productivity show a varying degree of coupling with Southern Hemisphere paleoclimate records following a glacial-interglacial cyclicity. Ecologically well-constrained groups of diatoms record the glacial-interglacial changes in water masses dynamics, nutrient availability, and stratification of the upper ocean. The good match between the glacial maxima of total diatoms concentration, Chaetoceros spores abundance, and opal content with the maximum seasonal cover of Antarctic ice and the atmospheric dust records points to a dominant Southern Hemisphere forcing of diatom production. Suborbital variability of SST suggests rapid latitudinal migrations of the Subtropical Front and associated water masses over the southern Agulhas Plateau, following millennial contractions and expansions of the subtropical gyres. Warmings of the upper ocean over site MD02-2588 during terminations IV to I occurred earlier than that in the Antarctic Vostok, which is indicative of a Northern Hemisphere lead. Our multiparameter reconstruction highlights how high-latitude atmospheric and hydrographic processes modulated orbital highs and lows in primary production and SST as triggered by northward transport of Si, eolian dust input, and latitudinal migrations of frontal zones.

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The changing roles of iron and vertical mixing in regulating nitrogen and silicon cycling in the Southern Ocean over the last glacial cycle

et al. 2014

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The Southern Ocean plays a critical role in the air-sea CO 2 balance through biological and physical mechanisms. Vertical supply of deep waters returns nutrients and CO 2 to the surface and stimulates phytoplankton growth. Photosynthesis in the Southern Ocean is limited by iron and only a fraction of the carbon and nutrients that return to the surface are consumed for potential sequestration in the deep sea. Here we present the most spatially extensive data set of silicon and nitrogen isotope measurements from diatom frustules to date to examine the controls on nutrient drawdown during the last glacial period and across the glacial termination in both the Antarctic and Subantarctic zones. The new data confirm existing views that differing silicon and nitrate consumption patterns in the Antarctic zone are likely the result, at least in part, of iron addition during the last glacial maximum (LGM). However, earlier in the glacial, a more coordinated response in the two proxy records, with both reflecting enhanced consumption during episodes of increased iron accumulation and export production, implies a different system response than observed for the LGM. A collapse of the expected equatorward gradient in silicon isotope values and contraction of the nitrogen isotope gradient during the deglaciation suggests that nutrient supply increased not only in the Antarctic Zone, but also in the Subantarctic, perhaps due to enhanced deep mixing locally. Enhanced deep water ventilation across the Southern Ocean likely increased the nutrient content of mode waters during the deglaciation.

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The biogeography of major diatom taxa in Southern Ocean sediments: 2. Open ocean related species

Cited by 201 publications

References 63 publications

Diatom evidence for the onset of Pliocene cooling from AND-1B, McMurdo Sound, Antarctica

Diatom evidence for the onset of Pliocene cooling from AND-1B, McMurdo Sound, Antarctica

High‐latitude forcing of diatom productivity in the southern Agulhas Plateau during the past 350 kyr

The changing roles of iron and vertical mixing in regulating nitrogen and silicon cycling in the Southern Ocean over the last glacial cycle

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