Morphological distinction of molecular types in Ammonia – towards a taxonomic revision of the world’s most commonly misidentified foraminifera

Hayward, Bruce W.; Holzmann, Maria; Grenfell, Hugh R.; Pawłowski, Jan; Triggs, C.M.

doi:10.1016/s0377-8398(03)00074-4

Cited by 234 publications

(206 citation statements)

References 28 publications

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“…Those employed by Toyofuku et al (2011) are Ammonias of molecular type T4, those of Diz et al (2012) of type T3 and those lumped for our calibration (Fig. 8) are of molecular type T6 (Hayward et al, 2004), which may account for the variability in Mg/Ca-T calibrations reported so far. Differences in Mg/Ca ratios of the closely related genotypes, or even within one species underscores the need for species-specific calibrations before applying foraminiferal Mg/Ca in paleoceanographic reconstructions (e.g.…”

Section: Tablementioning

confidence: 89%

“…Holzmann and Pawlowski, 1997;Debenay et al, 1998;Holzmann and Pawlowski, 2000;Hayward et al, 2004), culturing individuals from one clone group overcomes the potential imprint of genetic variability on calcite chemistry. This is particularly important since the genus of Ammonia is widely studied, but named differently The single-chambered juveniles form a relatively large and dense pseudopodial network that they use to move away from the parent in the following hours.…”

Section: Culturing and Reproductionmentioning

confidence: 99%

“…At our sampling location, 'Ammonia molecular type T6' is the dominant morphotype (Hayward et al, 2004), and will be referred to here as A. tepida.…”

Section: Culturing and Reproductionmentioning

confidence: 99%

“…Taxonomy for the genus Ammonia is notoriously unreliable (e.g. Holzmann and Pawlowski, 2000;Hayward et al, 2004), and specimens commonly used for laboratory studies span a wide genetic range. Those employed by Toyofuku et al (2011) are Ammonias of molecular type T4, those of Diz et al (2012) of type T3 and those lumped for our calibration (Fig.…”

Section: Tablementioning

confidence: 99%

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Variability in calcitic Mg/Ca and Sr/Ca ratios in clones of the benthic foraminifer Ammonia tepida

Nooijer

Hathorne

Reichart

et al. 2014

Marine Micropaleontology

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Biological activity introduces variability in element incorporation during calcification and thereby decreases the precision and accuracy when using foraminifera as geochemical proxies in paleoceanography. This so-called 'vital effect' consists of organismal and environmental components. Whereas organismal effects include uptake of ions from seawater and subsequent processing upon calcification, environmental effects include migration-and seasonality-induced differences. Triggering asexual reproduction and culturing juveniles of the benthic foraminifer Ammonia tepida under constant, controlled conditions allow environmental and genetic variability to be removed and the effect of cell-physiological controls on element incorporation to be quantified. Three groups of clones were cultured under constant conditions while determining their growth rates, size-normalized weights and single-chamber Mg/Ca and Sr/Ca using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS). Results show no detectable ontogenetic control on the incorporation of these elements in the species studied here. Despite constant culturing conditions, Mg/Ca varies by a factor of~4 within an individual foraminifer while intra-individual Sr/Ca varies by only a factor of 1.6. Differences between clone groups were similar to the intra-clone group variability in element composition, suggesting that any genetic differences between the clonegroups studied here do not affect trace element partitioning. Instead, variability in Mg/Ca appears to be inherent to the process of bio-calcification itself. The variability in Mg/Ca between chambers shows that measurements of at least 6 different chambers are required to determine the mean Mg/Ca value for a cultured foraminiferal test with a precision of ≤10%.

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Section: Tablementioning

confidence: 89%

Section: Culturing and Reproductionmentioning

confidence: 99%

“…At our sampling location, 'Ammonia molecular type T6' is the dominant morphotype (Hayward et al, 2004), and will be referred to here as A. tepida.…”

Section: Culturing and Reproductionmentioning

confidence: 99%

Section: Tablementioning

confidence: 99%

See 2 more Smart Citations

Variability in calcitic Mg/Ca and Sr/Ca ratios in clones of the benthic foraminifer Ammonia tepida

Nooijer

Hathorne

Reichart

et al. 2014

Marine Micropaleontology

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“…Foraminifera were tax o nom i cally iden ti fied at ge nus level for ju ve niles and at spe cies level for adults with the aim to un der stand the to tal stand ing crop and spe cies repre sen ta tion dur ing each sea son. Tax o nom i cal iden ti fi ca tion was car ried largely fol low ing the mono graphs of Hottinger et al (1993), Loeblich and Tappan (1994) and Hay ward et al (2004). Be cause much of the as sem blages con sisted of ju ve niles, we did not at tempt to re solve the spe cies tax on omy.…”

Section: Benthic Foraminifera Analysismentioning

confidence: 95%

Seasonal variations, environmental parameters, and standing crop assessment of benthic foraminifera in eastern Bahrain, Arabian Gulf

Arslan

Kaminski

Tawabini

et al. 2015

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Sea sonal vari a tions, en vi ron men tal pa ram e ters and stand ing crop as sess ment of ben thic foraminifera in east ern Bah rain, Ara bian Gulf Liv ing ben thic foraminifera in a rel a tively un pol luted site off shore Bah rain in the Ara bian Gulf, were stud ied to de ter mine the sea sonal vari abil ity of their pop u la tions, as well as en vi ron men tal pa ram e ters that may af fect their dis tri bu tion. The max i mum foraminiferal den sity was ob served dur ing win ter with the as sem blages pri mar ily dom i nated by rotaliids and sec ond arily by miliolids. The high pop u la tion is at trib uted to an in creased num ber of ju ve niles. A re la tion ship be tween sed i ment grain-size and the foraminiferal den sity re veals that ju ve niles were most abun dant on coarse-grained sandy sub strate and less abundant on fine-grained sub strates. In spring, the foraminiferal den sity de creased, and the low est val ues were ob served dur ing sum mer. The pop u la tion in creased again in au tumn with high est ju ve nile/adult ra tios. More over, re sults of rel a tive abundance and spe cies con sis tency show that Am mo nia and Glabratellina are con sis tent from the shal low est to the deep est station, whereas miliolids oc curred only at deeper sta tions. The num bers of Peneroplidae and Elphidium also in creased along the depth transect. En vi ron men tal char ac ter iza tion re veals that al though the site is sub ject to eutrophication caused by nitrates and sul fates, pol lu tion caused by hy dro car bons and heavy met als is not sig nif i cant. The as sess ment of 63 heavy metals showed that none of the met als had con cen tra tions that ex ceed in ter na tion ally ac cepted norms (the de vised level of Ef fect Range -Low), but with high con cen tra tion of stron tium. The lack of a sig nif i cant en vi ron men tal ef fect of heavy met als is con firmed by the Foraminiferal Ab nor mal ity In dex of <2%. Like wise, no hy dro car bon con tam i na tion was de tected in the wa ter or sed i ment sam ples. We con clude that the site in Bah rain is not yet ad versely af fected by hu man de vel op ment, and there fore can pro vide base line in for ma tion for fu ture com par i son and as sess ment of foraminiferal as sem blages in con tam inated zones of the Ara bian Gulf.

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Foraminifera

Edwards

Wright

2015

Handbook of Sea‐Level Research

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Morphological distinction of molecular types in Ammonia – towards a taxonomic revision of the world’s most commonly misidentified foraminifera

Cited by 234 publications

References 28 publications

Variability in calcitic Mg/Ca and Sr/Ca ratios in clones of the benthic foraminifer Ammonia tepida

Variability in calcitic Mg/Ca and Sr/Ca ratios in clones of the benthic foraminifer Ammonia tepida

Seasonal variations, environmental parameters, and standing crop assessment of benthic foraminifera in eastern Bahrain, Arabian Gulf

Foraminifera

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