Coccolith size rules – What controls the size of coccoliths during coccolithogenesis?

Suchéras-Marx, Baptiste; Viseur, Sophie; Walker, Charlotte E.; Beaufort, Luc; Probert, Ian; Bolton, Clara T

doi:10.1016/j.marmicro.2021.102080

Cited by 8 publications

(7 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is already generally accepted that coccolith size is a good proxy for cell diameter and volume (and thus inorganic carbon quota, cellular resource uptake rates, etc.) in many placolith-bearing taxa [122][123][124][125] and that the degree of calcification of a cell can also be reconstructed from individual coccoliths [83,[126][127][128][129].…”

Section: Functional Morphology: Exploring the Traitscape Of Coccolith...mentioning

confidence: 99%

Evolutionary Rates in the Haptophyta: Exploring Molecular and Phenotypic Diversity

Henderiks

Sturm

Šupraha

et al. 2022

JMSE

View full text Add to dashboard Cite

Haptophytes are photosynthetic protists found in both freshwater and marine environments with an origin possibly dating back to the Neoproterozoic era. The most recent molecular phylogeny reveals several haptophyte “mystery clades” that await morphological verification, but it is otherwise highly consistent with morphology-based phylogenies, including that of the coccolithophores (calcifying haptophytes). The fossil coccolith record offers unique insights into extinct lineages, including the adaptive radiations that produced extant descendant species. By combining molecular data of extant coccolithophores and phenotype-based studies of their ancestral lineages, it has become possible to probe the modes and rates of speciation in more detail, although this approach is still limited to only few taxa because of the lack of whole-genome datasets. The evolution of calcification likely involved several steps, but its origin can be traced back to an early association with organic scales typical for all haptophytes. Other key haptophyte traits, including the haplo-diplontic life cycle, are herein mapped upon the coccolithophorid phylogeny to help navigate a discussion of their ecological benefits and trade-offs in a rapidly changing ocean.

show abstract

Section: Functional Morphology: Exploring the Traitscape Of Coccolith...mentioning

confidence: 99%

Evolutionary Rates in the Haptophyta: Exploring Molecular and Phenotypic Diversity

Henderiks

Sturm

Šupraha

et al. 2022

JMSE

View full text Add to dashboard Cite

show abstract

“…Thus, a small change in N C may induce a large variance in PIC of Geoc. Alternatively, a cell is actually surrounded by the coccoliths in a variety of size or mass (Beuvier et al., 2019), and average M C may be biased by the single measurement, since different sized coccoliths can be produced during the life span of a cell (Suchéras‐Marx et al., 2022).…”

Section: Discussionmentioning

confidence: 99%

Estimating Coccolithophore PIC:POC Based on Coccosphere and Coccolith Geometry

Jin

Liu

2023

JGR Biogeosciences

View full text Add to dashboard Cite

The processes of marine biological calcification and photosynthesis govern the particulate inorganic and organic carbon (PIC and POC) production in the euphotic water columns. These two processes generate the opposite effects on seawater pCO 2 . Calcification is:which reduces ocean total alkalinity and dissolved inorganic carbon (DIC) in the mole ratio of 2:1 and elevates seawater pCO 2 . On the contrary, photosynthesis is:which converts aqueous CO 2 into organic carbon and results in a decrease in seawater pCO 2 (Figure 1). Thus, the molar ratio of PIC and POC (i.e., PIC:POC or rain ratio) produced in the ocean mixed layers can be critical for the efficiency of carbon fixation, and determine whether the combined effect of the biological processes is

show abstract

“…New coccoliths are produced at least every ca. 60 minutes (Paasche, 2002;Suchéras-Marx et al, 2022) and cells must produce ca. 6-10 new coccoliths between each cell division to ensure a complete cell covering for two daughter cells (based on mean CN 18-20 in our samples).…”

Section: Rapid Morphological Responses To Abrupt Salinity Stressmentioning

confidence: 99%

“…(1) that AE response must precede a CL response, (2) that the size change of CL and AE must be positively correlated over some reasonable timeframe(Suchéras-Marx et al, 2022), i.e., cell size does not increase whilst coccolith size decreases or vice versa, (3) that the relative magnitude of the cell size change and the corresponding coccolith size change are reasonably proportional (i.e., a small cell size change does not drive a disproportionally large change in coccolith size), and (4) that a change in AE due to onehttps://doi.org/10.5194/egusphere-2024-349 Preprint. Discussion started: 16 February 2024 c Author(s) 2024.…”

mentioning

confidence: 99%

Short-term response of Emiliania huxleyi growth and morphology to abrupt salinity stress

Sheward,

Gebühr,

Bollmann

et al. 2024

Preprint

View full text Add to dashboard Cite

Abstract. The marine coccolithophore species Emiliania huxleyi tolerates a broad range of salinity conditions over its near-global distribution, including the relatively stable physiochemical conditions of open ocean environments and nearshore environments with dynamic and extreme short-term salinity fluctuations. Previous studies show that salinity impacts the physiology and morphology of E. huxleyi, suggesting that salinity stress influences the calcification of this globally important species. However, it remains unclear how rapidly E. huxleyi responds to salinity changes and therefore whether E. huxleyi morphology is sensitive to short-term, transient salinity events (such as occur on meteorological timescales) in addition longer duration salinity changes. Here, we investigate the real-time growth and calcification response of two E. huxleyi strains isolated from shelf-sea environments to the abrupt onset of hyposaline and hypersaline conditions over a time periods of 156 h (6.5 days). Morphological responses in the size of the cellular exoskeleton (coccosphere) and the calcium carbonate plates (coccoliths) that form the coccosphere occurred as rapidly as 24–48 h following the abrupt onset of salinity 25 (hyposaline) and salinity 45 (hypersaline) conditions. Generally, cells tended towards smaller coccospheres (-24 %) with smaller coccoliths (-7 to -11 %) and reduced calcification under hyposaline conditions whereas cells growing under hypersaline conditions had either relatively stable coccosphere and coccolith sizes (Mediterranean strain RCC1232) or larger coccospheres (+35 %) with larger coccoliths (+13 %) and increased calcification (Norwegian strain PLYB11). This short-term response is consistent with reported coccolith size trends with salinity over longer durations of low and high salinity exposure in culture and under natural salinity gradients. The coccosphere size response of PLYB11 to salinity stress was greater in magnitude than observed in RCC1232 but occurred after a longer duration of exposure (ca. 96–128 h) to the new salinity conditions compared to RCC1232. In both strains, coccosphere size changes were larger and occurred more rapidly than changes in coccolith size, which tended to occur more gradually over the course of the experiments. Variability in the magnitude and timing of rapid morphological responses to short-term salinity stress between these two strains supports previous suggestions that the response of E. huxleyi to salinity stress is strain specific. At the start of the experiments, the light condition was also switched from a light: dark cycle to continuous light with the aim of desynchronising cell division. As cell density and mean cell size data sampled every 4 h showed regular periodicity under all salinity conditions, the cell division cycle retained its entrainment to pre-experiment light: dark conditions for the entire experiment duration. Extended acclimation periods to continuous light are therefore advisable for E. huxleyi to ensure successful desynchronisation of the cell division cycle. When working with phased or synchronised populations, data should be compared between samples taken from the same phase of the cell division cycle to avoid artificially distorting the magnitude or even direction of physiological or (bio)geochemical response to the environmental stressor.

show abstract

Coccolith size rules – What controls the size of coccoliths during coccolithogenesis?

Cited by 8 publications

References 41 publications

Evolutionary Rates in the Haptophyta: Exploring Molecular and Phenotypic Diversity

Evolutionary Rates in the Haptophyta: Exploring Molecular and Phenotypic Diversity

Estimating Coccolithophore PIC:POC Based on Coccosphere and Coccolith Geometry

Short-term response of Emiliania huxleyi growth and morphology to abrupt salinity stress

Contact Info

Product

Resources

About