Decalcification and survival of benthic foraminifera under the combined impacts of varying pH and salinity

Charrieau, Laurie M.; Filipsson, Helena L.; Nagai, Yukiko; Kawada, Sachiko; Ljung, Karl; Kritzberg, Emma S.; Toyofuku, Takashi

doi:10.1016/j.marenvres.2018.03.015

Cited by 33 publications

(20 citation statements)

References 50 publications

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“…The faunal shift from the hyaline‐dominated assemblage of the entrance ecozone to the agglutinated assemblage of the transitional ecozone one may be attributable to the negative gradient of Sal and pH. In fact, small changes in pH (0.1 unit) and Sal could determine consequences on benthic foraminiferal assemblages in terms of survival rate, reproduction, calcification, and resistance to shell dissolution (Charrieau et al, ; Diz et al, ).…”

Section: Discussionmentioning

confidence: 99%

Benthic foraminifera as proxies of marine influence in the Orosei marine caves, Sardinia, Italy

Romano

Bergamin

Bella

et al. 2020

Aquatic Conservation

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1. As a result of their location at the boundary between marine and continental domains, marine caves are affected by wide spatial and seasonal environmental changes. Only recently have benthic foraminifera been recognized as reliable indicators for the ecological zonation of these environments.2. The present study is focused on two marine caves of the Orosei Gulf, Sardinia, Italy: Bue Marino and Bel Torrente. It investigates the spatial and seasonal variability of benthic foraminiferal assemblages relative to sediment grain size and water parameters (temperature, salinity, pH, and dissolved oxygen) collected during two campaigns in August 2014 and April 2015. The results from 2014 have been partially published.3. Based on a comparison of the results of the two campaigns, the considerable reduction of foraminiferal abundance in Bel Torrente was deduced to occur because of the strong freshwater flows occurring during the rainy season; in Bue Marino, the less severe water flow allowed the identification of both living and dead foraminifera, although strongly reduced in number. These identifications allowed benthic foraminifera to be used to define the ecological zonation. 4. Entrance, confluence, and transitional ecozones were identified in Bue Marino cave on the basis of species abundance. The second ecozone, not recognized in 2014, was correlated with plant debris at the confluence of the two cave branches. The other two ecozones, which are characterized by the faunal shift from hyaline-to agglutinated-prevalent assemblages, were attributed to the gradient of abiotic parameters detected from the outer to the inner portions of the cave. In both campaigns the same ecozones were recognized in terms of species composition, with exceptions being found to different extents as a result of seasonal variability. 5.As the distribution of foraminiferal ecozones is conditioned by a decreasing gradient of marine influence, long-term monitoring may be regarded as a promising tool for future studies on sea-level change. K E Y W O R D SBel Torrente cave, benthic foraminifera, Bue Marino cave, ecological zonation, marine caves,

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Section: Discussionmentioning

confidence: 99%

Benthic foraminifera as proxies of marine influence in the Orosei marine caves, Sardinia, Italy

Romano

Bergamin

Bella

et al. 2020

Aquatic Conservation

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“…Today, proxies used for assessing primary productivity changes in the intertropical area are mainly represented by Total Organic Carbon, planktonic δ 13 C, and/or Biogenic Silica. However, calcareous and/or siliceous microfossils are extremely sensitive to dissolution through pH and temperature changes in the water column (e.g., Takahashi and Honjo, 1981;Barker et al, 2005;Barker, 2016;Charrieau et al, 2018), while organic-walled dinocysts are immune to the effect of dissolution, being more subject to oxidation issues (Zonneveld et al, 1997;Gray et al, 2017). Dinocyst-derived reconstructions of past primary productivity changes therefore provide one of the most significant observations in the intertropical area.…”

Section: Primary Productivity Changesmentioning

confidence: 99%

Dinoflagellate fossils: Geological and biological applications

Penaud

Hardy

Lambert

et al. 2018

Revue de Micropaléontologie

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Dinoflagellates are part of the marine plankton and about 200 species produce a cyst (dinocyst) during their life cycle, these organic-walled sexually-produced cysts being fossilizable in sediments for hundreds of millions of years. Over the past 40-50 years, dinocysts have led to major advances on Mesozoic-Cenozoic research, in terms of biostratigraphy and paleogeogeography. Dinocyst taxonomy has then been continuously revised, with the tabulation being the main morphological link between living dinoflagellates and fossilized cysts. Over the Quaternary, and based on the principle of uniformitarianism (i.e. species ecology did not change through time), relationships between modern assemblages and present-day environmental factors controlling their distribution also allow for dinocystbased quantitative reconstructions derived from transfer function calculations. This paper presents a non-exhaustive review of the dinocyst literature allowing the reader to get a perspective about how they were discovered and defined, but also how they are applied in (paleo)ecological studies according to the timescale considered allowing then to provide useful insights into the future climate change and its associated ecological repercussions.

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“…This nding is in agreement with several studies showing a strong dependence of calci cation on seawater aragonite saturation state 38 . Among the investigated species of the current study, only P. damicornis appears sensitive to the minor variation in salinity, which may indicate a trade-off between osmoregulatory and acid-base regulatory systems (controlling H + and HCO 3 − uptake from seawater), as observed in other calcifying marine organisms 39 . For example, responses of acid-base balance of crabs to both hypercapnia and changes in seawater salinity are related to iono-regulation because both homeostatic processes share the same mediators, such as H + and HCO 3 -transporters 40 .…”

Section: Discussionmentioning

confidence: 63%

Life-Long Coral Skeletal Acclimatization at CO2 Vents in Papua New Guinea Reveals Species- and Environment-Specific Effects

Prada

Brizi

Franzellitti

et al. 2021

Preprint

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The responses of corals and other marine calcifying organisms to ocean acidification (OA) are variable and span from no effect to severe responses. Here we investigated the effect of long-term exposure to OA on skeletal parameters of four tropical zooxanthellate corals living at two CO2 vents in Papua New Guinea, namely in Dobu and Upa Upasina. The skeletal porosity of Galaxea fascicularis, Acropora millepora, and Pocillopora damicornis was higher (from 17% to 38%, depending on the species) at the seep site compared to the control only at Upa Upasina. Massive Porites showed no differences at any of the locations. Pocillopora damicornis also showed a ~ 7% decrease of micro-density and an increase of the volume fraction of the larger pores, a decrease of the intraskeletal organic matrix content with an increase of the intraskeletal water content, and no variation in the organic matrix related strain and crystallite size. The fact that the skeletal parameters varied only at one of the two seep sites suggests that other local environmental conditions interact with OA to modify the coral skeletal parameters. This might also contribute to explain the great deal of responses to OA reported for corals and other marine calcifying organisms.

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Decalcification and survival of benthic foraminifera under the combined impacts of varying pH and salinity

Cited by 33 publications

References 50 publications

Benthic foraminifera as proxies of marine influence in the Orosei marine caves, Sardinia, Italy

Benthic foraminifera as proxies of marine influence in the Orosei marine caves, Sardinia, Italy

Dinoflagellate fossils: Geological and biological applications

Life-Long Coral Skeletal Acclimatization at CO2 Vents in Papua New Guinea Reveals Species- and Environment-Specific Effects

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