Effects of gametogenesis on test structure and dissolution of some spinose planktonic foraminifera and implications for test preservation

Caron, David A.; Anderson, O. Roger; Lindsey, J. L.; Faber, Walter W.; Lim, Ee Lin

doi:10.1016/0377-8398(90)90031-g

Cited by 75 publications

(93 citation statements)

References 27 publications

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“…For instance, Erez and Honjo (1981) calculated a gam calcite addition of 36% to the final shell mass of O. universa by comparing plankton and sediment trap specimens. Similarly, Bé (1980) suggested an addition of 28% gam calcite to the test of the symbiont symbiont-bearing species G. sacculifer, based on comparison between surface sediment and plankton tow shell masses, and Caron et al (1990) concluded gam calcite contributed 180-250% to O. universa shells when sedimentary shell masses were compared with shell weights from pre-gam specimens that had died in the laboratory.…”

Section: Discussionmentioning

confidence: 99%

“…Globigerinoides sacculifer, G. conglobatus, Orbulina universa, Neogloboquadrina pachyderma, N. dutertrei and Globorotalia spp.) are known to deposit an additional calcite crust of variable thickness on the outer surface of their shells (Bé, 1980;Bé et al, 1983;Bé et al, 1973;Caron et al, 1990;Hemleben et al, 1985;Srinivasan and Kennett, 1974). In species such as G. sacculifer, G. conglobatus, and O. universa, this secondary calcite crust is associated with the release of gametes at the end of the life cycle and is commonly called gametogenic or 'gam' calcite.…”

Section: Introductionmentioning

confidence: 99%

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Geochemical investigation of gametogenic calcite addition in the planktonic foraminifera Orbulina universa

Hamilton

Spero

Biȷma

et al. 2008

Marine Micropaleontology

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Several species of planktonic foraminifera precipitate a final layer of calcite onto the shell surface immediately prior to gamete release at the end of the foraminifera life cycle. Here, we present the results of carbon-13, oxygen-18 and thermal labeling experiments conducted under high (HL) and low light (LL) regimes that vary symbiont photosynthetic activity. Mean experimental group data show that gametogenic (gam) calcite contributes between 4-17% and 14-20% to final shell mass for high and low light experiments respectively. These data indicate that past studies of gam calcite addition have overestimated the amount of gam calcite on foraminifera shells by~30-55%. Calculations indicate that the mass of gam calcite added to the O. universa shell, 4.2 ± 2.0 μg and 4.0 ± 2.4 μg, is constant in the HL and LL groups respectively. We propose that the production of gam calcite may be the result of the discharge of a relatively constant-volume cytoplasmic pool of either Ca 2+ or alkalinity (carbon pool) that increases the calcite saturation state in the microenvironment adjacent to the foraminifera shell just prior to gamete formation and release. Results from these experiments indicate that the geochemistry of thin-walled O. universa from deep sea sediments is composed of N 80% ontogenetic calcite that was precipitated in the primary, near surface habitat of this species. Published by Elsevier B.V.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Geochemical investigation of gametogenic calcite addition in the planktonic foraminifera Orbulina universa

Hamilton

Spero

Biȷma

et al. 2008

Marine Micropaleontology

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“…Schmidt et al, 2013). Finally, immediately before foraminifera reproduce and die, many species (although not G. ruber; Caron et al, 1990) precipitate a thick final layer of carbonate known as gametogenic calcite. Other species appear to secondarily thicken their tests following precipitation of their final chamber and some may form a crust (e.g.…”

Section: Ontogenetic Modelling Of Calcification Intensitymentioning

confidence: 99%

Size-dependent response of foraminiferal calcification to seawater carbonate chemistry

et al. 2017

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Abstract. The response of the marine carbon cycle to changes in atmospheric CO 2 concentrations will be determined, in part, by the relative response of calcifying and non-calcifying organisms to global change. Planktonic foraminifera are responsible for a quarter or more of global carbonate production, therefore understanding the sensitivity of calcification in these organisms to environmental change is critical. Despite this, there remains little consensus as to whether, or to what extent, chemical and physical factors affect foraminiferal calcification. To address this, we directly test the effect of multiple controls on calcification in culture experiments and core-top measurements of Globigerinoides ruber. We find that two factors, body size and the carbonate system, strongly influence calcification intensity in life, but that exposure to corrosive bottom waters can overprint this signal post mortem. Using a simple model for the addition of calcite through ontogeny, we show that variable body size between and within datasets could complicate studies that examine environmental controls on foraminiferal shell weight. In addition, we suggest that size could ultimately play a role in determining whether calcification will increase or decrease with acidification. Our models highlight that knowledge of the specific morphological and physiological mechanisms driving ontogenetic change in calcification in different species will be critical in predicting the response of foraminiferal calcification to future change in atmospheric pCO 2 .

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“…First, Caron et al [1990] showed that G. ruber does not add significant gametogenic calcite and dissolution processes, if occurring, would not affect the isotopic ratios. Second, this process cannot account for the benthic isotopic excursions, since the ontogenetic and the gametogenic calcite layers of benthic foraminifera do not carry significantly different isotopic signatures.…”

Section: Processes Altering the Primary Isotopic Signalsmentioning

confidence: 99%

Influence of diagenesis on the stable isotopic composition of biogenic carbonates from the Gulf of Tehuantepec oxygen minimum zone

Blanchet¹,

Kasten²,

Vidal³

et al. 2012

Geochem Geophys Geosyst

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[1] In order to evaluate the influence of diagenetic and post-sampling processes on the stable oxygen and carbon isotope compositions of biogenic carbonates, we conducted a multiproxy study of organic-rich sediments from the eastern Pacific oxygen minimum zone. Core MD02-2520, which was retrieved from the Gulf of Tehuantepec (Mexico), has seasonal laminations and covers the last 40 kyr. Together with the presence of gypsum crystals and inorganic calcite aggregates, the occurrence of large excursions in the stable oxygen and carbon isotope records of both planktonic and benthic foraminifera (as large as +3‰ in d18 O and À5‰ in d 13 C) point to significant secondary transformations. Storage-related gypsum precipitation was ruled out since it implies sulfide reoxidation by oxygen that triggers biogenic calcite dissolution, which proved to be of minor importance here. Instead, precipitation of authigenic calcite during early diagenesis appears to be the most likely process responsible for the observed isotopic excursions. The d 13 C composition for inorganic calcite aggregates (À5 to À7‰) suggests a major contribution from anaerobic oxidation of organic matter. The d 34 S composition for gypsum crystals (À10 to +15‰) suggests a major contribution from anaerobic reoxidation of authigenic sulfides, potentially involving reactions with metal oxides and sulfur disproportionation. A minor part of the gypsum might possibly have formed as a result of local pore water salinity increases induced by gas hydrate formation.

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Effects of gametogenesis on test structure and dissolution of some spinose planktonic foraminifera and implications for test preservation

Cited by 75 publications

References 27 publications

Geochemical investigation of gametogenic calcite addition in the planktonic foraminifera Orbulina universa

Geochemical investigation of gametogenic calcite addition in the planktonic foraminifera Orbulina universa

Size-dependent response of foraminiferal calcification to seawater carbonate chemistry

Influence of diagenesis on the stable isotopic composition of biogenic carbonates from the Gulf of Tehuantepec oxygen minimum zone

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