Briguglio, A.

Eder, W.

Ferrandez, C.

Hohenegger, J.

Kinoshita, S.

Woeger, J.

English

Briguglio A.

Eder W.

Woeger J.

Kinoshita S.

Ferrandez C.

Hohenegger J.

Archivio istituzionale della ricerca - Università di Genova

Geophysical Research AbstractsVol. 17, EGU2015-2630, 2015EGU General Assembly 2015© Author(s) 2015. CC Attribution 3.0 License.Oscillatory growth in Larger Benthic Foraminifera: problems,interpretations and possible solutions.Antonino Briguglio (1,2), Wolfgang Eder (2), Julia Woeger (2), Shunichi Kinoshita (2), CarlesFerrandez-Canadell (3), and Johann Hohenegger (2)(1) Universiti Brunei Darussalam, Faculty of Science, Petroleum Geoscience, Brunei Darussalam, Brunei Darussalam(antonino.briguglio@ubd.edu.bn), (2) 1Universität Wien, Department of Palaeontology, UZA II Geozentrum, Althanstraße 14,1090 Vienna, (3) 3Universitat de Barcelona, Departament d’Estratigrafia, Paleontologia I Geociències Marines, MartíFranqués, 08028 BarcelonaThe possibility to investigate cell growth and its oscillations through time in Larger Benthic Foraminifera (LBF) bymeans of Micro Computed Tomography (microCT) is a recent and well known methodology. However, the searchfor factors of oscillations around undisturbed growth – the latter can be modelled by theoretical growth functions(e.g. Gompertz and generalized logistic growth function) – is hampered by a number of factors which have beenrecently discovered and not yet published. Cycles are obtained based on a mean chamber building rate gainedfrom specimens cultured in the laboratory because punctual data available in the literature are too incomplete togain a more realistic growth model. The mean chamber building rate can be also modeled (e.g. Power-, Michaelis-Menten- and Bertallanffy function). The periodicity of the cycles observed in LBF is mostly concentrated arounda prominent 29 to 30 days cycle. Other cycles, proportions and multiples of this dominant cycle are common, butprobably should be considered as calculation effects in case of their inconsistency. The 30 days cycles are present inalmost all specimens investigated, which may be a hint to a correlation between cell growth and the light intensityvariation of lunar cycles, which can affect the photosynthetic activity of the endosymbionts in LBF tests. However,this correlation is challenged by a number of issues, which need to be further investigated. One of these problems isrepresented by the recent discovery of similar cycles in LBF tests, which have been laboratory-cultured and shouldtherefore not show any environmental effects. A focused analysis of growth cycles observed in these laboratorytests showed that even if the periods are constant and significant at 30 days, their phases show a much broadervariance compared to naturally grown specimens. Epigenetic signals and their influence on the oscillatory growthof cultivated organisms can be considered to play a major role in the preservation of environmentally controlledcycles in a stable laboratory environment. Furthermore, out of all cultivated specimens investigated during thisstudy, the majority of chambers build after the initial stadium show massive effects of abnormal chamber buildingprocesses and dissolution effects. However, if this can be considered as the cell’s response to a non-oscillatingenvironment or secondary dissolution events, possibly due to imperfect alteration of the cultivation environment,is still open.

Oscillatory growth in Larger Benthic Foraminifera: problems, interpretations and possible solutions

https://iris.unige.it/bitstream/11567/921339/2/EGU2015-2630.pdf

Oscillatory growth in Larger Benthic Foraminifera: problems, interpretations and possible solutions

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Archivio istituzionale della ricerca - Università di Genova