Morphology and biogeography of Gephyrocapsa coccoliths in Holocene sediments

Bollmann, Jörg

doi:10.1016/s0377-8398(96)00028-x

Cited by 200 publications

(163 citation statements)

References 29 publications

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“…Gephyrocapsa ornata Heimdall, 1973;Gephyrocapsa crassipons Okada and McIntyre, 1977;Gephyrocapsa protohuxleyi McIntyre, 1970). In contrast to previous studies, the quantitative morphological analysis of Gephyrocapsa assemblages from globally distributed Holocene sediment samples revealed six dominant morphological associations related to distinct environmental conditions with respect to sea surface temperature and productivity (Figure 1; Bollmann (1997)). Furthermore, morphological parameters such as size or bridge angle appear to vary with environmental conditions such as temperature, showing seemingly continuous transitions between all morphological associations, suggestive of one global species with high eco-phenotypic plasticity (Fig.…”

Section: Species Definitions Within the Genus Gephyrocapsacontrasting

confidence: 99%

“…Since then, various combinations of size, bridge angle, roundness (ratio of width/length), pore width and other descriptive features led to the description of numerous morphospecies from the Miocene to the Holocene. A detailed overview is given by Perch-Nielsen (1985) and Bollmann (1997 ; Table 1). …”

Section: Species Definitions Within the Genus Gephyrocapsamentioning

confidence: 99%

“…1). Bollmann (1997) described the different morphotypes informally because it is not evident from his sediment analysis whether the different morphotypes correspond to discrete species, or to one species showing a high phenotypic plasticity.…”

Section: Species Definitions Within the Genus Gephyrocapsamentioning

confidence: 99%

“…The traditional taxonomic perception of homogeneous cosmopolitan species has become questionable in recent years because several cosmopolitan species exhibit remarkable fine scale morphological variations (Bollmann 1997;Bollmann and Herrle 2007;Hagino et al 2000;Knappertsbusch et al 1997;Quinn et al 2005;Young and Westbroek 1991). These fine scale variations allow the identification of morphotypes that show a characteristic biogeographic pattern or environmental adaptation (Brand 1981).…”

Section: Introductionmentioning

confidence: 99%

“…These fine scale variations allow the identification of morphotypes that show a characteristic biogeographic pattern or environmental adaptation (Brand 1981). These results have led to questions regarding whether eco-phenotypic or genotypic variation within the cosmopolitan species such as Gephyrocapsa oceanica cause the fine scale morphological variation (Bollmann 1997).…”

Section: Introductionmentioning

confidence: 99%

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Morphological Variation of Gephyrocapsa oceanica Kamptner 1943 in Plankton Samples: Implications for Ecologic and Taxonomic Interpretations

Bollmann

Klaas

2008

Protist

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Section: Species Definitions Within the Genus Gephyrocapsacontrasting

confidence: 99%

Section: Species Definitions Within the Genus Gephyrocapsamentioning

confidence: 99%

Section: Species Definitions Within the Genus Gephyrocapsamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Morphological Variation of Gephyrocapsa oceanica Kamptner 1943 in Plankton Samples: Implications for Ecologic and Taxonomic Interpretations

Bollmann

Klaas

2008

Protist

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Coccolithophores as proxy of seawater changes at orbital-to-millennial scale during middle Pleistocene Marine Isotope Stages 14-9 in North Atlantic core MD01-2446

et al. 2014

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Quantitative coccolithophore analyses were performed in core MD01-2446, located in the midlatitude North Atlantic, to reconstruct climatically induced sea surface water conditions throughout Marine Isotope Stages (MIS) 14-9. The data are compared to new and available paleoenvironmental proxies from the same site as well as other nearby North Atlantic records that support the coccolithophore signature at glacial-interglacial to millennial climate scale. Total coccolithophore absolute abundance increases during interglacials but abruptly drops during the colder glacial phases and deglaciations. Coccolithophore warm water taxa (wwt) indicate that MIS11c and MIS9e experienced warmer and more stable conditions throughout the whole photic zone compared to MIS13. MIS11 was a long-lasting warmer and stable interglacial characterized by a climate optimum during MIS11c when a more prominent influence of the subtropical front at the site is inferred. The wwt pattern also suggests distinct interstadial and stadial events lasting about 4-10 kyr. The glacial increases of Gephyrocapsa margereli-G. muellerae 3-4 μm along with higher values of C org , additionally supported by the total alkenone abundance at Site U1313, indicate more productive surface waters, likely reflecting the migration of the polar front into the midlatitude North Atlantic. Distinctive peaks of G. margereli-muellerae (>4 μm), C. pelagicus pelagicus, Neogloboquadrina pachyderma left coiling, and reworked nannofossils, combined with minima in total nannofossil accumulation rate, are tracers of Heinrich-type events during MIS12 and MIS10. Additional Heinrich-type events are suggested during MIS12 and MIS14 based on biotic proxies, and we discuss possible iceberg sources at these times. Our results improve the understanding of mid-Brunhes paleoclimate and the impact on phytoplankton diversity in the midlatitude North Atlantic region.

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A cold and fresh ocean surface in the Nordic Seas during MIS 11: Significance for the future ocean

Kandiano

Meer

Bauch

et al. 2016

Geophysical Research Letters

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Paleoceanographical studies of Marine Isotope Stage (MIS) 11 have revealed higher‐than‐present sea surface temperatures (SSTs) in the North Atlantic and in parts of the Arctic but lower‐than‐present SSTs in the Nordic Seas, the main throughflow area of warm water into the Arctic Ocean. We resolve this contradiction by complementing SST data based on planktic foraminiferal abundances with surface salinity changes using hydrogen isotopic compositions of alkenones in a core from the central Nordic Seas. The data indicate the prevalence of a relatively cold, low‐salinity, surface water layer in the Nordic Seas during most of MIS 11. In spite of the low‐density surface layer, which was kept buoyant by continuous melting of surrounding glaciers, warmer Atlantic water was still propagating northward at the subsurface thus maintaining meridional overturning circulation. This study can help to better constrain the impact of continuous melting of Greenland and Arctic ice on high‐latitude ocean circulation and climate.

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Morphology and biogeography of Gephyrocapsa coccoliths in Holocene sediments

Cited by 200 publications

References 29 publications

Morphological Variation of Gephyrocapsa oceanica Kamptner 1943 in Plankton Samples: Implications for Ecologic and Taxonomic Interpretations

Morphological Variation of Gephyrocapsa oceanica Kamptner 1943 in Plankton Samples: Implications for Ecologic and Taxonomic Interpretations

Coccolithophores as proxy of seawater changes at orbital-to-millennial scale during middle Pleistocene Marine Isotope Stages 14-9 in North Atlantic core MD01-2446

A cold and fresh ocean surface in the Nordic Seas during MIS 11: Significance for the future ocean

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