Present-day coccolith fluxes recorded in central eastern Mediterranean sediment traps and surface sediments

Ziveri, Patrizia; Rutten, A. J.; Lange, Gert J. de; Thomson, J.; Corselli, Cesare

doi:10.1016/s0031-0182(00)00049-3

Cited by 123 publications

(90 citation statements)

References 36 publications

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“…Coccolithophores have been found to constitute large part of the population in autumn and winter, e.g., in the Rhodos gyre area (64%, Gotsis-Skretas et al, 1999;Malinverno et al, 2003), in the Aegean Sea , South Adriatic and Ionian Seas (Rabitti et al, 1994). A consistent proportion of coccolithophores was also reported in winter offshore of the Catalan Front and in spring in the Aegean Sea , while maximum fluxes were recorded in winter-spring in the central EMS (Ziveri et al, 2000). In a trans-Mediterranean study conducted in June 1999, coccolithophores were more abundant and diversified at eastern stations than at western ones (Ignatiades et al, 2009).…”

Section: The Nanoplanktonsupporting

confidence: 65%

Plankton in the open Mediterranean Sea: a review

et al. 2010

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Abstract. We present an overview of the plankton studies conducted during the last 25 years in the epipelagic offshore waters of the Mediterranean Sea. This quasi-enclosed sea is characterized by a rich and complex physical dynamics with distinctive traits, especially in regard to the thermohaline circulation. Recent investigations have basically confirmed the long-recognised oligotrophic nature of this sea, which increases along both the west-east and the north-south directions. Nutrient availability is low, especially for phosphorous (N:P up to 60), though this limitation may be buffered by inputs from highly populated coasts and from the atmosphere. Phytoplankton biomass, as chl a, generally displays low values (less than 0.2 µg chl a l −1 ) over large areas, with a modest late winter increase. A large bloom (up to 3 µg l −1 ) is observed throughout the late winter and spring exclusively in the NW area. Relatively high biomass values are recorded in fronts and cyclonic gyres. A deep chlorophyll maximum is a permanent feature for the whole basin, except during the late winter mixing. It is found at increasingly greater depths ranging from 30 m in the Alboran Sea to 120 m in the easternmost Levantine basin. Primary production reveals a west-east decreasing trend and ranges between 59 and 150 g C m −2 y −1 (in situ measurements). Overall, the basin is largely dominated by small autotrophs, microheterotrophs and egg-carrying copepod species. The microorganisms (phytoplankton, viruses, bacteria, flagellates and ciliates) and zooplankton components reveal a considerable diversity and

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Section: The Nanoplanktonsupporting

confidence: 65%

Plankton in the open Mediterranean Sea: a review

et al. 2010

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“…10 and 11) and to that of E. huxleyi (Aksu et al, 2002). Ziveri et al (2000a), observed a few overgrown specimens of Emiliania huxleyi in deep sediment trap samples (3000 m water depth) and more common specimens in core-top sediments with variable abundance at different sampling stations (their Fig. 4c).…”

Section: Are There Reticulofenestra Coccoliths In the Holocene -Late mentioning

confidence: 82%

“…Flores et al, 1997;Sbaffi et al, 2001). Second, they are absent from modern assemblages, for example Ziveri et al (2000a) reported from Eastern Mediterranean surface sediments, abundant Reticulofenestra ''overcalcified'' sp. coccoliths, but very few of these specimens were observed in deep water sediment trap samples.…”

Section: Authorsmentioning

confidence: 98%

“…Modern Reticulofenestra species are Reticulofenestra parvula, Reticulofenestra punctata and Reticulofenestra sessilis (Okada and McIntyre, 1977;Jordan and Kleijne, 1994) but R. parvula is the only species observed to date in Mediterranean water samples (Ziveri et al, 2000a;Cros, 2002) and surface sediments (Ziveri et al, 2000a). The species is rare to absent in Mediterranean surface waters (Cros, 2002 andKleijne, 1993, respectively).…”

Section: Holocene -Latest Late Pleistocene Reticulofenestridsmentioning

confidence: 99%

“…Re-examination of their SEM images (their Plate I, figures 7 and 8) suggests they correspond to E. huxleyi OG2, whilst their LM images (their Plate I, figures 2 -3) are similar to our EHMC. Ziveri et al (2000a) reported Reticulofenestra overcalcified sp. from deep sediment trap and surface sediment samples.…”

Section: Are There Reticulofenestra Coccoliths In the Holocene -Late mentioning

confidence: 99%

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Abnormal carbonate diagenesis in Holocene–late Pleistocene sapropel-associated sediments from the Eastern Mediterranean; evidence from Emiliania huxleyi coccolith morphology

Crudeli

Young

Erba

et al. 2004

Marine Micropaleontology

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In studying the Holocene -late Pleistocene record of the Eastern Mediterranean, considerable Emiliania huxleyi size/shape variation not clearly assignable to primary or secondary calcification was observed. Accordingly, different morphotypes were distinguished by light microscope (LM).A subsequent scanning electron microscope (SEM) analysis of selected samples has indicated that Emiliania huxleyi coccoliths are variably affected by carbonate diagenesis in these sediments. A series of diagenetic stages were qualitatively defined, comprising well-preserved specimens, three overgrowth (OG1 to OG3) and one etching (E1) stage. Comparing SEM and LM observations, a tentative correlation between the E. huxleyi calcified LM-morphotypes and E. huxleyi SEM-overgrowth stages is proposed here.Our study not only indicates that Emiliania huxleyi coccoliths are strongly influenced by carbonate diagenesis, but also that they show effects of carbonate precipitation and dissolution much more clearly than other coccoliths. The relative abundances of the different LM-morphotypes were used to define an E. huxleyi overgrowth index (EXO) that qualitatively estimates carbonate precipitation/dissolution on coccoliths in this sediment. This resulted in definition of five ''Diagenetic'' intervals (D1 to D5). Deposition of sapropel S1 was a time of good preservation with variable dissolution and no overgrowth of E. huxleyi coccoliths, whereas calcite overgrowth was high during the Last Glacial Maximum (LGM) and interglacial period and, to a lesser extent, during the Younger Dryas and through the last 5 ka. D

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