Extant silicoflagellates from the Northeast Aegean (eastern Mediterranean Sea): Morphologies and double skeletons

Maliverno, Elisa; Karatsolis, Boris Theofanis; Dimiza, Margarita D.; Lagaria, Anna; Psarra, Stella; Triantaphyllou, Maria

doi:10.1016/j.revmic.2016.06.001

Cited by 7 publications

(8 citation statements)

References 78 publications

(134 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Syracosphaera pulchra seems to have an oligotrophic-mesotrophic distribution (Ziveri et al 2000a, b;Triantaphyllou et al, 2004;Crudeli et al, 2006) and indicates warmer surface waters and low salinities (Flores et al, 1999;Colmenero-Hidalgo et al, 2004;Dimiza et al, 2008Dimiza et al, , 2015Karatsolis et al, 2016). The ecological affinities of this taxon are consistent with the seasonally controlled fluctuations in our sediment trap records, where S. pulchra exhibited flux peaks associated with increasing SSTs (Supplementary Fig.…”

Section: Coccolithophore Assemblage Compositionsupporting

confidence: 84%

“…Warm and salty (>39 psu) Levantine Surface Water (LSW) is present when BSW is absent, whereas Levantine Intermediate Water (LIW; 14-15°C, 38.8-39.1 psu) extends to a depth of about 400 m below the BSW/LSW. The inflow of the BSW mass causes enrichment in particulate and dissolved organic matter, leading to enhanced planktonic biomass and primary production (e.g., Ignatiades et al, 2002;Lagaria et al, 2013;Karatsolis et al, 2016;Skampa et al, 2019).…”

Section: North Aegean Seamentioning

confidence: 99%

“…Although the North Aegean Sea displays overall oligotrophic characteristics, seasonal mesotrophic features are present during the high-productivity spring period, under the influence of the BSW inflow, with Chl-a reaching concentration of 1 µg L -1 (Ignatiades et al, 2002;Zervoudaki et al, 2011;Lagaria et al, 2013;Malinverno et al, 2016). The Deep Chlorophyll Maximum (DCM) located within the LSW mass at around 60m depth (Lagaria et al, 2013).…”

Section: North Aegean Seamentioning

confidence: 99%

See 2 more Smart Citations

Coccolithophore export in three deep-sea sites of the Aegean and Ionian Seas (Eastern Mediterranean): Biogeographical patterns and biogenic carbonate fluxes

Skampa

Triantaphyllou

Dimiza

et al. 2020

Deep Sea Research Part II: Topical Studies in Oceanography

View full text Add to dashboard Cite

Section: Coccolithophore Assemblage Compositionsupporting

confidence: 84%

Section: North Aegean Seamentioning

confidence: 99%

Section: North Aegean Seamentioning

confidence: 99%

See 1 more Smart Citation

Coccolithophore export in three deep-sea sites of the Aegean and Ionian Seas (Eastern Mediterranean): Biogeographical patterns and biogenic carbonate fluxes

Skampa

Triantaphyllou

Dimiza

et al. 2020

Deep Sea Research Part II: Topical Studies in Oceanography

View full text Add to dashboard Cite

“…The surface BSW outflow and interchange of the water masses directly influence autotrophic activity of the underlying water layers (Ignatiades et al 2002;Siokou-Frangou et al, 2002), accounting for significant export from the surface BSW layer, thus 'fertilizing' the underlying water masses with organic matter (Frangoulis et al, 2010;Lagaria et al, this issue). Extant silicoflagellate populations studied in the same samples in March 2014 (Malinverno et al, 2016), provided extra evidence of the influence of cold and low salinity BSW on organisms as they displayed high abundance and peculiar morphologies of Stephanocha speculum, with skeletal characters reported so far only from the cold high-latitudes in both hemispheres but also recovered from Black Sea waters (Triantaphyllou et al, 2014). Such morphologies were instead rare at station AMT6 that was not at all influenced by the BSW flux in March 2014.…”

Section: Coccolithophore Assemblages In the Different Ne Aegean Watermentioning

confidence: 98%

Coccolithophore assemblage response to Black Sea Water inflow into the North Aegean Sea (NE Mediterranean)

Karatsolis

Triantaphyllou

Dimiza

et al. 2017

Continental Shelf Research

View full text Add to dashboard Cite

This study aims to presents the species composition of living coccolithophore communities in the NE Aegean Sea, investigating their spatial and temporal variations along a north-south transect in the area receiving the inflowing surface Black Sea Water (BSW) over the deeper Levantine Water (LW) layer. Coccolithophores in the area were relatively diverse and a total of 95 species over 3 sampling periods studied were recognized using Scanning Electron Microscope (SEM) techniques. R-mode hierarchical cluster analysis distinguished two coccolithophore Groups (I, IIa, IIb, IIc) with different ecological preferences. Emiliania huxleyi was the most abundant species of Group I, whereas Syracosphaera spp., Rhabdosphaera spp. and holococcolithophores were prevailing in the highly diversified Group II assemblages. Biometric analysis conducted on E. huxleyi coccoliths from Aegean water column and Black Sea sediment trap samples, indicated that during autumn, NE Aegean specimens in samples under BSW influence were featured by unimodal distribution concerning the coccolith relative tube width, with values similar to those provided by the Black Sea specimens. In early spring, coccoliths in the stations with increased BSW influx displayed a bimodal pattern of relative tube width with smaller values found mostly in the surface layers, while the distribution became again unimodal and dominated by larger values within the deeper LW layers. In the summer period, the typical LW holococcolithophore species (Group II) presented low cell numbers in the surface layer (<20 m), which is their usual ecological niche in the Aegean Sea, compared to greater depths, therefore marking LW mass flowing beneath the less saline 2 BSW surface lid. In contrast to Black Sea early summer bloom conditions, E. huxleyi was almost absent in the NE Aegean during the summer sampling period.

show abstract

“…Sometimes thinner skeletons have been observed in association with thicker skeletons (e.g. Marshall, 1934;Abe et al, 2015;Malinverno et al, 2016), and these are now thought to be the daughter and mother skeletons, respectively. However, this has not been supported yet by culture observations.…”

Section: Introductionmentioning

confidence: 99%

Morphometric analysis of early Eocene <i>Corbisema</i> skeletons (Silicoflagellata) in Mors, Denmark

Tsutsui

Jordan

Nishiwaki

et al. 2018

J. Micropalaeontol.

View full text Add to dashboard Cite

Abstract.A two-dimensional morphometric programme, recently designed to measure fossil skeletons of the silicoflagellate genus Corbisema, was used to investigate specimens of the C. apiculata-C. triacantha complex found in a sample from the Fur Formation on the island of Mors, Jutland, Denmark. The semi-automated programme measured the lengths of the basal sides and radial spines, the basal side curvature, and the location of the pikes (if present) from a photographic database (N = 469). As a result, two distinct morphological groups were revealed based on their radial spine length : basal side length ratio and the presence or absence of pikes: group A (ratio of 1 : 1.3, no pikes) and group B, with the latter subdivided into B1 (ratio of 1 : 7, with pikes) and B2 (ratio of 1 : 6, no pikes). Group A (C. triacantha sensu lato) possesses a small basal ring with relatively straight basal sides and long radial spines, while group B has a large basal ring with curved basal sides and short radial spines. In B1 specimens (C. apiculata sensu stricto) the pikes are positioned 0 to 1 µm away from the junction point of the strut and basal ring. This would suggest that B1 double skeletons are likely to be in the Star-ofDavid configuration, while A and B2 double skeletons (which lack pikes) are likely to be in the corner-to-corner configuration. Compared with the previously published biometric studies of extant Stephanocha (Stephanocha speculum complex in the Southern Ocean and S. medianoctisol in the Arctic Ocean), the results are somewhat different: although C. triacantha sensu lato (group A) is similar to the modern species of Stephanocha, the latter have smaller basal ring diameters, whereas specimens of C. apiculata sensu lato (types B1 and B2) have large basal rings. If their cell diameters are calculated, B1 is the largest, with S. speculum being the smallest -about half the size of B1. This could suggest that the relationship between radial spine length and mean basal ring size has shifted over geological time.

show abstract

Extant silicoflagellates from the Northeast Aegean (eastern Mediterranean Sea): Morphologies and double skeletons

Cited by 7 publications

References 78 publications

Coccolithophore export in three deep-sea sites of the Aegean and Ionian Seas (Eastern Mediterranean): Biogeographical patterns and biogenic carbonate fluxes

Coccolithophore export in three deep-sea sites of the Aegean and Ionian Seas (Eastern Mediterranean): Biogeographical patterns and biogenic carbonate fluxes

Coccolithophore assemblage response to Black Sea Water inflow into the North Aegean Sea (NE Mediterranean)

Morphometric analysis of early Eocene <i>Corbisema</i> skeletons (Silicoflagellata) in Mors, Denmark

Contact Info

Product

Resources

About

Extant silicoflagellates from the Northeast Aegean (eastern Mediterranean Sea): Morphologies and double skeletons

Cited by 7 publications

References 78 publications

Coccolithophore export in three deep-sea sites of the Aegean and Ionian Seas (Eastern Mediterranean): Biogeographical patterns and biogenic carbonate fluxes

Coccolithophore export in three deep-sea sites of the Aegean and Ionian Seas (Eastern Mediterranean): Biogeographical patterns and biogenic carbonate fluxes

Coccolithophore assemblage response to Black Sea Water inflow into the North Aegean Sea (NE Mediterranean)

Morphometric analysis of early Eocene &lt;i&gt;Corbisema&lt;/i&gt; skeletons (Silicoflagellata) in Mors, Denmark

Contact Info

Product

Resources

About

Morphometric analysis of early Eocene <i>Corbisema</i> skeletons (Silicoflagellata) in Mors, Denmark