Growth of Heterostegina depressa under natural and laboratory conditions

Eder, Wolfgang; Briguglio, Antonino; Hohenegger, Johann

doi:10.1016/j.marmicro.2015.11.005

Cited by 24 publications

(27 citation statements)

References 56 publications

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“…The 3D-technique for Micro-CT can produce multiple tomographic images (slices). These multiple tomographic images can be applied to a specific program for generating 3D-models which provides details of internal and external structures (Baumgartner-Mora et al, 2006;Görög et al, 2010;Dardon et al, 2010;Briguglio and Benedetti, 2012;Briguglio et al, 2013Briguglio et al, , 2014Ferrández-Canadell et al, 2014;Eder et al, 2016).…”

Section: Three Dimensional Technique For Micro-ctmentioning

confidence: 99%

“…This technique can be used for instance: to quantify volumetrically cells of foraminifera (Eder et al, 2016); to study the growth and functional morphology by volume measurements and surface of the chambers (Briguglio et al, 2014); to identify small perturbations in the cell growth and deviations in growth by the distance of the septum (Briguglio et al, 2013) and, to execute biometric analysis (Briguglio and Beneditte, 2012).…”

Section: Three Dimensional Technique For Micro-ctmentioning

confidence: 99%

“…Some types of tomographs are more suitable for large materials and allow to scan ossicles, teeth, minerals, small pieces of fossil plants, porosities and microstructures of different natures (Lasso et al, 2008;Garwood et al, 2009;Garwood and Sutton, 2010). Micro-CT is able to scan at high resolution, materials with micrometers dimension, including foraminifera (Görög et al, 2010;Briguglio and Benedetti, 2012;Briguglio et al, 2013Briguglio et al, , 2014Ferrández-Canadell et al, 2014;Eder et al, 2016), or nanometers dimension.…”

Section: Three Dimensional Technique For Micro-ctmentioning

confidence: 99%

“…Some works used this methodology to study foraminifera such as: Görög et al (2010); Briguglio and Benedetti (2012); Briguglio et al (2013Briguglio et al ( , 2014; Ferrández-Canadell et al (2014); Eder et al (2016).…”

Section: Introductionmentioning

confidence: 99%

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Three Dimensional Models of Pyrgo Depressa (D’orbigny, 1826) (Foraminifera) Performed With Microtomography Techniques

et al. 2016

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Graphic Computer and the three dimensional technique (3D) has its applicability in various fields of science, such as: medicine, zoology, botany and paleontology. In the paleontology field it has been applied, mainly in the study of vertebrates and invertebrates fossils. The 3D-models of the scanned fossils by computed microtomography (micro-CT) allow to observe full details of its internal and external morphology. The three-dimensional model of the species provides great detailing of internal and external structures, which can contribute to a better understanding and characterization of morphological features of the analyzed materials. This work aims to detail the morphology of Pyrgo depressa (d'Orbigny, 1826) (benthic foraminifera) using the micro-CT technics. Results of imagens and of the 3D-modells obtained by micro-CT analysis allowed the observation of the initial and later chambers arrangement, the proloculus with a columnar structure and two apertures, the sequence and linearization of the apertures and toothplates of the following chambers, the walls thickness and density. The 3D-models also allow to deduce the function of teeth which is related to the initial formation of the peripheral keel.

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Section: Three Dimensional Technique For Micro-ctmentioning

confidence: 99%

Section: Three Dimensional Technique For Micro-ctmentioning

confidence: 99%

Section: Three Dimensional Technique For Micro-ctmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Three Dimensional Models of Pyrgo Depressa (D’orbigny, 1826) (Foraminifera) Performed With Microtomography Techniques

et al. 2016

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“…The most striking differences between modern and fossil LF are size and possibly lifespan (Ferrández-Cañadell et al 2014): recent taxa never reach the volume of their fossil counterparts and they are thought to live for a much shorter time (Hohenegger 2006;Briguglio and Hohenegger 2014;Eder et al 2016). Even the largest modern LF taxon, Cycloclypeus carpenteri, which is indeed large but also extremely thin and fragile (Briguglio et al 2016), cannot compete in volume with the thick and heavy Eocene nummulites.…”

Section: Introductionmentioning

confidence: 99%

Shear Versus Settling Velocity of Recent and Fossil Larger Foraminifera: New Insights on Nummulite Banks

Briguglio¹,

Seddighi²,

Papazzoni³

et al. 2017

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The genesis of nummulite banks remains a poorly understood topic and the aim of this work is to shed light on it by observing the hydrodynamic behavior of selected larger foraminifera collected from both bank and non- bank deposits. Entrainment and settling velocity of both recent and fossil larger foraminifera were measured using a flume channel and settling tube. Both velocities give information about the reaction of foraminiferal shells to different hydrodynamic conditions affecting their capability to build bank-like sedimentary structures. To assess entrainment, experiments were performed on different substrates to simulate bed load transport on smooth surfaces, fine sand, coarse sand, and bioclastic substrates. Thirty-four recent and 49 fossil shells of foraminifera were used; recent taxa used are Operculina ammonoides, Heterostegina depressa, and Palaeonummulites venosus and fossil taxa used are Nummulites perforatus, N. fabianii, and N. tavertetensis (only A forms were used in this study). Our results seem to differentiate the hydrodynamic behavior of shells collected from banks from those collected from non-bank deposits. The latter possess settling velocities significantly lower than their entrainment velocities, while for taxa collected from nummulite banks, settling velocities are always close to entrainment velocities. Therefore, the relation between hydrodynamics and shape and size may explain why modern larger foraminifera, consistently of smaller size than fossil forms, cannot produce banks and that transport as bed load in moving water was possibly the main trigger for the production of nummulite banks

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Growth, chamber building rate and reproduction time of Palaeonummulites venosus (Foraminifera) under natural conditions

et al. 2017

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We investigated the symbiont-bearing benthic foraminifer Palaeonummulites venosus to determine the chamber building rate (CBR), test diameter increase rate (DIR), reproduction time and longevity using the 'natural laboratory' approach. This is based on the decomposition of monthly obtained frequency distributions of chamber number and test diameter into normally distributed components. Test measurements were taken using MicroCT. The shift of the mean and standard deviation of component parameters during the 15-month investigation period was used to calculate Michaelis-Menten functions applied to estimate the averaged CBR and DIR under natural conditions. The individual dates of birth were estimated using the inverse averaged CBR and the inverse DIR fitted by the individual chamber number or the individual test diameter at the sampling date. Distributions of frequencies and densities (i.e., frequency divided by sediment weight) based on both CBR and DIR revealed continuous reproduction throughout the year with two peaks, a stronger one in June determined as the onset of the summer generation (generation 1) and a weaker one in November determined as the onset of the winter generation (generation 2). This reproduction scheme explains the presence of small and large specimens in the same sample. Longevity, calculated as the maximum difference in days between the individual's birth date and the sampling date, is approximately 1.5 yr, an estimation obtained by using both CBR and DIR.

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Growth of Heterostegina depressa under natural and laboratory conditions

Cited by 24 publications

References 56 publications

Three Dimensional Models of Pyrgo Depressa (D’orbigny, 1826) (Foraminifera) Performed With Microtomography Techniques

Three Dimensional Models of Pyrgo Depressa (D’orbigny, 1826) (Foraminifera) Performed With Microtomography Techniques

Shear Versus Settling Velocity of Recent and Fossil Larger Foraminifera: New Insights on Nummulite Banks

Growth, chamber building rate and reproduction time of Palaeonummulites venosus (Foraminifera) under natural conditions

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