Effects of ocean acidification on 109Cd, 57Co, and 134Cs bioconcentration by the European oyster (Ostrea edulis): Biokinetics and tissue-to-subcellular partitioning

Journal of Environmental Radioactivity, Journal Year: 2018, Volume and Issue: 192, P. 376 - 384

Published: July 23, 2018

Language: Английский

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Relationship between shell integrity of pelagic gastropods and carbonate chemistry parameters at a Scottish Coastal Observatory monitoring site

ICES Journal of Marine Science, Journal Year: 2019, Volume and Issue: unknown

Published: Sept. 6, 2019

Abstract Ocean acidification (OA), the anthropogenic carbon dioxide-induced changes in seawater carbonate chemistry, is likely to have a significant impact on calcifying plankton. Most planktonic studies OA are based “one-off” cruises focused offshore areas while observations from inshore waters scarce. This study presents first analysis shell integrity of pelagic gastropods (holoplanktonic pteropods and larvae otherwise benthic species) at Scottish Coastal Observatory monitoring site Stonehaven east coast Scotland. The archived specimens 2011 2013 was examined using Scanning Electron Microscopy relationship with (pH aragonite saturation, Ωarg) other environmental parameters investigated. Evidence dissolution detected all analysed taxa even though supersaturated respect aragonite. condition matched temporal pattern observed Ωarg, higher proportion associated decreasing suggesting that seasonality component chemistry might affect gastropods. differed significantly between adult stages pteropods, supporting hypothesis early-life would be more vulnerable OA-induced changes. Our data also suggest sensitivity may differ closely related taxonomic groups. strong interannual variability revealed by year-to-year Ωarg illustrates difficulty assessing plankton response field value time series studies.

Language: Английский

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Combined stress of ocean acidification and warming influence survival and drives differential gene expression patterns in the Antarctic pteropod, Limacina helicina antarctica

Conservation Physiology, Journal Year: 2020, Volume and Issue: 8(1)

Published: Jan. 1, 2020

Abstract The ecologically important thecosome pteropods in the Limacina spp. complex have recently been focus of studies examining impacts global change factors – e.g., ocean acidification (OA) and warming (OW) on their performance physiology. This is driven by conservation concerns where health pteropod populations threatened high susceptibility shells to dissolution low aragonite saturation states associated with OA how coupling these stressors may push past limits physiological plasticity. In this manipulation experiment, we describe changes transcriptome Antarctic pteropod, helicina antarctica, combined stressors. conditions used laboratory treatments met or exceeded those projected for Southern Ocean year 2100. We made two general observations regarding outcome data: (1) Temperature was more influential than pH terms changing patterns gene expression, (2) appeared a significant degree transcriptomic plasticity respond acute abiotic stress laboratory. general, differential expression observed amongst treatments; here, example, transcripts maintaining protein structure cell proliferation were up-regulated. To disentangle effects OW, weighted co-expression network analysis explore transcriptome. approach identified networks OW that enriched proposed be involved increasing membrane fluidity at warmer temperatures. Together data provide evidence L.h.antarctica has limited capacity acclimate study. reduced scope acclimation argues continued study adaptation polar aquatic environments limit present-day responding future environmental change.

Language: Английский

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Distribution of coccoliths in surface sediments across the Drake Passage and calcification of <i>Emiliania huxleyi</i> morphotypes

Biogeosciences, Journal Year: 2022, Volume and Issue: 19(3), P. 585 - 612

Published: Feb. 2, 2022

Abstract. The Southern Ocean is experiencing rapid and profound changes in its physical biogeochemical properties that may influence the distribution composition of pelagic plankton communities. Coccolithophores are most prolific carbonate-producing phytoplankton group, playing an important role cycles. However, knowledge scarce about record (sub-)fossil coccolith assemblages Ocean, which constitute invaluable indicators for palaeoenvironmental reconstructions. This study investigates preserved surface sediments southernmost Chile across Drake Passage were retrieved during R/V Polarstern expedition PS97. We focused on response to steep environmental gradients frontal system Antarctic Circumpolar Current hydrodynamic post-depositional processes occurring this region. used statistical analyses explore parameters influenced by means cluster redundancy analyses. specifically assessed morphological diversity dominant taxa, i.e. Emiliania huxleyi, emphasizing biogeographical variability morphotypes, sizes calcite carbonate mass estimations. High abundances species compared studies same area other sectors occur, with a high richness especially south Polar Front. While offshore north Front provide suitable material reconstruct overlying ocean conditions, further factors such as temporary thriving coccolithophore communities waters or transport settling coccoliths via bottom currents eddies Additionally, deeper samples southern part particularly affected selective dissolution. identified five E. huxleyi morphotypes (A, A overcalcified, R, B/C O) estimated masses basis scanning electron microscope images. morphologies reflect diverging distributions, trending towards smaller lighter importance documenting those relation changing conditions assess their projected change Ocean.

Language: Английский

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Impact of preservation techniques on pteropod shell condition

Polar Biology, Journal Year: 2018, Volume and Issue: 42(2), P. 257 - 269

Published: Oct. 31, 2018

Language: Английский

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