Morphologic variability of the coccolithophorid Calcidiscus leptoporus in the plankton, surface sediments and from the Early Pleistocene

Knappertsbusch, Michael; Cortés, Mara Y.; Thierstein, Hans R.

doi:10.1016/s0377-8398(96)00053-9

Cited by 100 publications

(94 citation statements)

References 28 publications

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“…1) with maximum strength between spring and fall (Hendershott and Winant, 1996). During winter, the CC carries colder and nutrientdepleted waters into the SBB, which are favorable for coccolithophore species like G. muellerae that prefers cold and moderately productive waters (Bollmann, 1997;Flores et al, 1997;Knappertsbusch et al, 1997). We observed high abundances of G. muellerae from November to April (Fig.…”

Section: Coccolith Ecology In Sbb Inferred From the Sediment Recordmentioning

confidence: 66%

Coccolithophore response to climate and surface hydrography in Santa Barbara Basin, California, AD 1917–2004

2009

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Abstract. The varved sedimentary AD 1917 record from the depositional center of the Santa Barbara Basin (SBB, California) was analyzed with monthly to triannual resolution to yield relative abundances of six coccolithophore species representing at least 96% of the coccolithophore assemblage. Seasonal/annual relative abundances respond to climatic and surface hydrographic conditions in the SBB, whereby (i) the three species G. oceanica, H. carteri and F. profunda are characteristic of the strength of the northward flowing warm California Counter Current, (ii) the two species G. ericsonii and G. muellerae are associated with the cold equatorward flowing California Current, (iii) and E. huxleyi appears to be endemic to the SBB. Spectral analyses on relative abundances of these species show that all are influenced by the El Niño Southern Oscillation (ENSO) and/or by the Pacific Decadal Oscillation (PDO). Increased relative abundances of G. oceanica and H. carteri are associated with warm ENSO events, G. muellerae responds to warm PDO events and the abundance of G. ericsonii increases during cold PDO events. Morphometric parameters measured on E. huxleyi, G. muellerae and G. oceanica indicate increasing coccolithophore shell carbonate mass from ∼1917 until 2004 concomitant with rising pCO 2 and sea surface temperature in the region of the SBB.

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Section: Coccolith Ecology In Sbb Inferred From the Sediment Recordmentioning

confidence: 66%

Coccolithophore response to climate and surface hydrography in Santa Barbara Basin, California, AD 1917–2004

2009

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“…and the bridge angle (in Gephyrocapsa spp.) -this has led to the identification of sub-morphotypes and morphological gradients within species (Bollmann 1997;Knappertsbusch et al 1997;Knappertsbusch 2000).…”

Section: Morphologymentioning

confidence: 99%

“…Together with the Gephyrocapsa-Emiliania plexus, Calcidiscus is probably the best documented coccolithophorid genus (Brand 1981;Knappertsbusch et al 1997, Knappertsbusch 2000Baumann and Sprengel 2000;Renaud and Klaas 2001;Renaud et al 2002;Quinn et al, 2003). Like the aforementioned genera it has a broad, inter-oceanic occurrence spanning a range of ecological variation and a very good, continuous fossil record through the last 23 Ma.…”

Section: Calcidiscus Spp (Plate 4)mentioning

confidence: 99%

“…Molecular evidence suggests that they have been genotypically independent for more than 5 Ma according to the molecular clock of Sáez et al (2003). Similarly, in modern Calcidiscus three morphotypes have been tentatively distinguished based on size variation and subtle morphological differences (Kleijne 1991(Kleijne , 1993Knappertsbusch et al 1997), but there has been uncertainty as to whether they intergrade or are discrete and hence whether they are ecophenotypes (Knappertsbusch 2000;Renaud and Klaas 2001). New data from plankton samples, life-cycle stages, culture studies and molecular genetic work all indicate that they in fact represent discrete species that probably diverged in the Middle Miocene (Geisen et al 2002;Renaud et al 2002;Sáez et al 2003;Quinn et al 2003).…”

Section: Synthesis Speciation and Divergences (Plate 7)mentioning

confidence: 99%

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Species level variation in coccolithophores

et al. 2004

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Coccolithophores are an ideal test group for investigating fine-scale differentiation within the phytoplankton since their taxonomy is rather well-documented and their biomineralised periplasts -the coccoliths -provide a rich suite of qualitative and quantitative morphological characters and a uniquely extensive fossil record. In addition, extant coccolithophore species can be grown in culture and hence are available for studies of morphological variability under controlled conditions, molecular genetic studies and cytological research.For the CODENET project the following extant species with seemingly global occurrence and spanning the biodiversity of coccolithophores were selected: Coccolithus pelagicus, Calcidiscus leptoporus, Umbilicosphaera sibogae, Syracosphaera pulchra, Gephyrocapsa oceanica, and Helicosphaera carteri. These were used as case studies to elucidate their species level biodiversity. The key merit of our approach was the use of multiple, independent lines of evidence, so as to remove the ambiguity implicit in any one type of study. In each case morphotypes of previously uncertain significance have been shown to represent discrete genotypes and probably well-separated species, with divergence times ranging 314 Geisen et al. from about 100 kyrs to >10 myrs. The evolutionary significance of these results is discussed.

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“…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%

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

Bollmann

Klaas

2008

Protist

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Morphologic variability of the coccolithophorid Calcidiscus leptoporus in the plankton, surface sediments and from the Early Pleistocene

Cited by 100 publications

References 28 publications

Coccolithophore response to climate and surface hydrography in Santa Barbara Basin, California, AD 1917–2004

Coccolithophore response to climate and surface hydrography in Santa Barbara Basin, California, AD 1917–2004

Species level variation in coccolithophores

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

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