Changing structure of benthic foraminiferal communities due to declining pH: Results from laboratory culture experiments

Dong, Shuaishuai; Lei, Yanli; Li, Tiegang; Jian, Zhimin

doi:10.1007/s11430-018-9321-6

Cited by 7 publications

(4 citation statements)

References 50 publications

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“…These results indicate that benthic foraminifera are unlikely to be affected by pH decreases of ∼ 0.2 but certainly respond adversely to higher acidification levels (∼ 0.4 pH). These findings are generally consistent with previous observations from other naturally high-pCO 2 sites in which taxonomic metrics decreased significantly with declining pH (Bernhard et al, 2009;Dias et al, 2010;Pettit et al, 2015;Dong et al, 2019Dong et al, , 2020. It is noteworthy, however, that changes in assemblage composition did not follow the same pattern observed in these previous studies.…”

Section: Foraminiferal Resistance To Intermediate-ph Conditionssupporting

confidence: 91%

Acidification impacts and acclimation potential of Caribbean benthic foraminifera assemblages in naturally discharging low-pH water

et al. 2022

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Abstract. Ocean acidification (OA) is expected to negatively affect many ecologically important organisms. Here we report the response of Caribbean benthic foraminiferal assemblages to naturally discharging low-pH waters with a composition similar to that expected for the end of the 21st century. At low pH ∼ 7.8 and low saturation state with respect to calcite (Ωcalcite < 4), the relative abundance of hyaline, agglutinated, and symbiont-bearing species increased, indicating higher resistance to potential carbonate chemistry changes. Diversity and other taxonomical metrics (i.e., richness, abundance, and evenness) declined steeply with decreasing pH despite exposure of this ecosystem to low-pH conditions for millennia, suggesting that tropical foraminiferal communities will be negatively impacted under acidification scenarios SSP3-7.0 (Shared Socioeconomic Pathways) and SSP5-8.5. The species Archaias angulatus, a major contributor to sediment production in the Caribbean, was able to calcify at more extreme conditions (7.1 pH) than those projected for the late 21st century, but the calcified tests had a lower average density than those exposed to higher-pH conditions (7.96), indicating that reef foraminiferal carbonate production might decrease this century. Smaller foraminifera were particularly sensitive to low pH, and our results demonstrate their potential use to monitor OA conditions.

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Section: Foraminiferal Resistance To Intermediate-ph Conditionssupporting

confidence: 91%

Acidification impacts and acclimation potential of Caribbean benthic foraminifera assemblages in naturally discharging low-pH water

et al. 2022

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Section: Foraminiferal Resistance To Intermediate-ph Conditionssupporting

confidence: 91%

Acidification impacts and acclimation potential of foraminifera

François

Paytan

Araújo

et al. 2022

Preprint

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Abstract. Ocean acidification is expected to negatively affect many ecologically important organisms. Here we explored the response of Caribbean benthic foraminiferal communities to naturally discharging low-pH waters similar to expected future projections for the end of the 21st century. At low-pH (~ 7.7 pH units), low calcite saturation, agglutinated and symbiont-bearing species were relatively more abundant, indicating higher resistance to potential carbonate chemistry changes. Diversity and other taxonomical metrics declined steeply with decreasing pH despite exposure of this ecosystem for millennia to low pH conditions, suggesting that tropical foraminifera communities will be negatively impacted under acidification scenarios SSP3-7.0 and SSP5-8.5. The species Archaias angulatus, a major contributor to sediment production in the Caribbean was able to calcify at conditions more extreme than those projected for the late 21st century (7.1 pH units), but the calcified tests were of lower density than those exposed to high-pH ambient conditions (7.96 pH units), indicating that reef foraminiferal carbonate budget might decrease. Smaller foraminifera were highly sensitive to decreasing pH and our results demonstrate their potential as indicators to monitor increasing OA conditions.

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“…P. tuberculatum contributes 75% to 86% of the foraminiferal intracellular nitrate and plays an important role in nitrate storage, transport, and removal. P. tuberculatum is a typical cold‐water species and adapts to low‐temperature environments (Dong et al 2019). Sta.…”

Section: Discussionmentioning

confidence: 99%

“…5), which was the first report of enriched intracellular nitrate (232 AE 26 pmol ind −1 ). P. tuberculatum, a typical cold-water species, is widely reported to occur in the Yellow Sea in a narrow temperature range (7-13 C) and at water depth range of approximately 40-70 m; P. tuberculatum is significantly dominant in the YSCWM, which provides a relatively stable and comfortable environment (Li et al 2014;Dong et al 2019). The calcareous species H. nipponica produced the maximum average living depth in this study and stored the most intracellular nitrate (296 AE 49 pmol ind −1 ) (Fig.…”

Section: Discussionmentioning

confidence: 99%

Potential foraminiferal nitrate transport in sediments in contact with oxic overlying water

Liu

Ning

2021

Limnology & Oceanography

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Sedimentary denitrification accounts for more than half of the global marine fixed nitrogen loss, but this removal is often restricted by nitrate diffusive supply in sediments. The results of this study showed that foraminiferal nitrate transport may supply nitrate below the nitrate penetration depth and promote nitrogen removal in sediments in contact with oxic overlying water. Six dominant foraminiferal species in the Yellow Sea sediments accumulated high concentrations of intracellular nitrate (25–68 mM), which is 1000 times higher than the maximum pore water nitrate concentration. Notably, this is the first time that Protelphidium tuberculatum, the most dominant species at almost all stations, is reported to have elevated intracellular nitrate. P. tuberculatum contributes 45% to 92% of the foraminiferal intracellular nitrate pools and plays an important role in foraminiferal nitrate transport. The potential foraminiferal denitrification rates below the nitrate penetration depth induced by foraminiferal nitrate transport ranged from 4 to 117 μmol N m−2 d−1 and contributed 3% to 81% of sedimentary denitrification. The intensity of foraminiferal nitrate transport showed a negative correlation with the nitrate penetration depth and positively correlated with the chlorophyll a (Chl a) and chloroplastic pigment equivalent concentrations, which indicate that shallower redox depth (nitrate penetration depth) and increased food supply (Chl a, chloroplastic pigment equivalent) may promote foraminiferal nitrate transport. The trophic oxygen model was modified by adding the pore water nitrate to explain foraminiferal nitrate transport in various marine environments, and this modified trophic oxygen model predicts the observed high foraminiferal nitrate transport intensity.

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Changing structure of benthic foraminiferal communities due to declining pH: Results from laboratory culture experiments

Cited by 7 publications

References 50 publications

Acidification impacts and acclimation potential of Caribbean benthic foraminifera assemblages in naturally discharging low-pH water

Acidification impacts and acclimation potential of Caribbean benthic foraminifera assemblages in naturally discharging low-pH water

Acidification impacts and acclimation potential of foraminifera

Potential foraminiferal nitrate transport in sediments in contact with oxic overlying water

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