Early Cenozoic calcareous nannoplankton biogeography of the Atlantic Ocean

Haq, Bilal U.; Lohmann, G. P.

doi:10.1016/0377-8398(76)90008-6

Cited by 243 publications

(178 citation statements)

References 7 publications

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“…The samples were taken mainly from the calcareous-rich claystones and siltstones. Nannofossil samples were prepared by the decantation method (Haq & Lohmann 1976;Perch-Nielsen 1985). The smear slides were inspected under the light microscope Zeiss at 1.500 × magnification and nannofossils documented by digital camera.…”

Section: Methodsmentioning

confidence: 99%

Oligocene-Early Miocene Planktonic Microbiostratigraphy and Paleoenvironments of the South Slovakian Basin (Lučenec Depression)

Ozdínová

Soták²

2015

Geologica Carpathica

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Oligocene and Lower Miocene sediments of the Lučenec Depression were studied to demonstrate the planktonic bioevents and climatic proxies from the Číž Formation (Rupelian) and Lučenec Formation (Chattian-Aquitanian) on the basis of quantitative analyses of foraminifers and calcareous nannofossils. The oldest nannofossil assemblages of the Číž Formation belonged to the NP23 Zone and were dominated by Reticulofenestra ornata known for preference of temperate eutrophic water conditions. An increase in bioproductivity was documented by abundant large-sized planktonic foraminifers (e.g. Turborotalia ampliapertura, Paragloborotalia nana, Subbotina gortanii) and epifaunal to shallow-infaunal benthic species. The middle part of the Číž Formation reveals a lowstand progradation of deltaic sediments of the Rapovce Member. There, the planktonic foraminifers are impoverished in both size and diversity, containing mostly tenuitellid and cassigerinellid species, probably as a result of decreased salinity and increased anoxia in the Tard Clay. Contrary of this, the benthic foraminifers are rich, mainly the infaunal forms of uvigerinid species. They probably proliferated due to a high organic flux from riverine input.

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Section: Methodsmentioning

confidence: 99%

Oligocene-Early Miocene Planktonic Microbiostratigraphy and Paleoenvironments of the South Slovakian Basin (Lučenec Depression)

Ozdínová

Soták²

2015

Geologica Carpathica

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“…The standard calcareous nannofossil zonations of Martini (1971) and Okada and Bukry (1980) are widely used for low-and middle-latitude Eocene-Oligocene (E-O) biostratigraphic studies, and were used in this paper. To infer probable temperature and trophic variations of surface waters, most calcareous nannofossils were, when possible, allocated into groups of environmental affinities, largely following Haq and Lohmann (1976), Aubry (1992), Gardin and Monechi (1998), Bralower (2002a,b), Tremolada and Bralower (2004), Persico and Villa (2004), Gibbs et al (2006), Villa et al (2008), Raffi et al (2009) and Agnini et al (2011). Based on this literature, the following environmental groups were used: eutrophic taxa (Dictyococcites bisectus, Dictyococcites scrippsae, Reticulofenestra daviesii), and oligotrophic taxa (Cribrocentrum reticulatum, Ericsonia spp., Sphenolithus spp., Zygrhablithus bijugatus) (Appendix B).…”

Section: Methodsmentioning

confidence: 99%

Enhanced primary productivity and magnetotactic bacterial production in response to middle Eocene warming in the Neo-Tethys Ocean

Savian

Jovane

Frontalini

et al. 2014

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…Spatial and temporal analysis of coccoliths reveals the evolution, biogeography and ecology of past species (e.g. Haq and Lohmann, 1976;Knappertsbusch, 2000;Ziveri et al, 2004;Gibbs et al, 2006;Baumann et al, 2016) and the response of species and communities to palaeoceanographic and palaeoclimatic variability (e.g. Bollmann et al, 2002Bollmann et al, , 2009Bown, 2005;Bown and Pearson, 2009).…”

Section: R M Sheward Et Al: Physiology Regulates Growth-phase Shifmentioning

confidence: 99%

Physiology regulates the relationship between coccosphere geometry and growth phase in coccolithophores

et al. 2017

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Abstract. Coccolithophores are an abundant phytoplankton group that exhibit remarkable diversity in their biology, ecology and calcitic exoskeletons (coccospheres). Their extensive fossil record is a testament to their important biogeochemical role and is a valuable archive of biotic responses to environmental change stretching back over 200 million years. However, to realise the full potential of this archive for (palaeo-)biology and biogeochemistry requires an understanding of the physiological processes that underpin coccosphere architecture. Using culturing experiments on four modern coccolithophore species (Calcidiscus leptoporus, Calcidiscus quadriperforatus, Helicosphaera carteri and Coccolithus braarudii) from three long-lived families, we investigate how coccosphere architecture responds to shifts from exponential (rapid cell division) to stationary (slowed cell division) growth phases as cell physiology reacts to nutrient depletion. These experiments reveal statistical differences in coccosphere size and the number of coccoliths per cell between these two growth phases, specifically that cells in exponential-phase growth are typically smaller with fewer coccoliths, whereas cells experiencing growth-limiting nutrient depletion have larger coccosphere sizes and greater numbers of coccoliths per cell. Although the exact numbers are species-specific, these growth-phase shifts in coccosphere geometry demonstrate that the core physiological responses of cells to nutrient depletion result in increased coccosphere sizes and coccoliths per cell across four different coccolithophore families (Calcidiscaceae, Coccolithaceae, Isochrysidaceae and Helicosphaeraceae), a representative diversity of this phytoplankton group. Building on this, the direct comparison of coccosphere geometries in modern and fossil coccolithophores enables a proxy for growth phase to be developed that can be used to investigate growth responses to environmental change throughout their long evolutionary history. Our data also show that changes in growth rate and coccoliths per cell associated with growthphase shifts can substantially alter cellular calcite production. Coccosphere geometry is therefore a valuable tool for accessing growth information in the fossil record, providing unprecedented insights into the response of species to environmental change and the potential biogeochemical consequences.

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Early Cenozoic calcareous nannoplankton biogeography of the Atlantic Ocean

Cited by 243 publications

References 7 publications

Oligocene-Early Miocene Planktonic Microbiostratigraphy and Paleoenvironments of the South Slovakian Basin (Lučenec Depression)

Oligocene-Early Miocene Planktonic Microbiostratigraphy and Paleoenvironments of the South Slovakian Basin (Lučenec Depression)

Enhanced primary productivity and magnetotactic bacterial production in response to middle Eocene warming in the Neo-Tethys Ocean

Physiology regulates the relationship between coccosphere geometry and growth phase in coccolithophores

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