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  • 11
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    Single-Cell Genomics Reveals the Divergent Mitochondrial Genomes of Retaria (Foraminifera and Radiolaria) (2023)
    American Society for Microbiology
    In:  mBio vol. 14 no. 2
    Details
    Publication Date: 2024-05-24
    Description: Mitochondria originated from an ancient bacterial endosymbiont that underwent reductive evolution by gene loss and endosymbiont gene transfer to the nuclear genome. The diversity of mitochondrial genomes published to date has revealed that gene loss and transfer processes are ongoing in many lineages. Most well-studied eukaryotic lineages are represented in mitochondrial genome databases, except for the superphylum Retaria—the lineage comprising Foraminifera and Radiolaria. Using singlecell approaches, we determined two complete mitochondrial genomes of Foraminifera and two nearly complete mitochondrial genomes of radiolarians. We report the complete coding content of an additional 14 foram species. We show that foraminiferan and radiolarian mitochondrial genomes contain a nearly fully overlapping but reduced mitochondrial gene complement compared to other sequenced rhizarians. In contrast to animals and fungi, many protists encode a diverse set of proteins on their mitochondrial genomes, including several ribosomal genes; however, some aerobic eukaryotic lineages (euglenids, myzozoans, and chlamydomonas-like algae) have reduced mitochondrial gene content and lack all ribosomal genes. Similar to these reduced outliers, we show that retarian mitochondrial genomes lack ribosomal protein and tRNA genes, contain truncated and divergent small and large rRNA genes, and contain only 14 or 15 proteincoding genes, including nad1, -3, -4, -4L, -5, and -7, cob, cox1, -2, and -3, and atp1, -6, and -9, with forams and radiolarians additionally carrying nad2 and nad6, respectively. In radiolarian mitogenomes, a noncanonical genetic code was identified in which all three stop codons encode amino acids. Collectively, these results add to our understanding of mitochondrial genome evolution and fill in one of the last major gaps in mitochondrial sequence databases.
    Keywords: Foraminifera ; mitochondrial evolution ; mitochondrial genome ; Radiolaria ; Retaria ; Rhizaria
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 12
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    COI metabarcoding of large benthic Foraminifera: Method validation for application in ecological studies (2022)
    Wiley
    In:  Ecology and Evolution vol. 12 no. e9549
    Details
    Publication Date: 2024-05-24
    Description: Monitoring community composition of Foraminifera (single-celled marine protists) pro-vides valuable insights into environmental conditions in marine ecosystems. Despitethe efficiency of environmental DNA (eDNA) and bulk-sample DNA (bulk-DNA) me-tabarcoding to assess the presence of multiple taxa, this has not been straightforwardfor Foraminifera partially due to the high genetic variability in widely used ribosomalmarkers. Here, we test the correctness in retrieving foraminiferal communities by me-tabarcoding of mock communities, bulk-DNA from coral reef sediment samples, andeDNA from their associated ethanol preservative using the recently sequenced cy-tochrome c oxidase subunit 1 (COI) marker. To assess the detection success, we com-pared our results with large benthic foraminiferal communities previously reportedfrom the same sampling sites. Results from our mock communities demonstrate thatall species were detected in two mock communities and all but one in the remainingfour. Technical replicates were highly similar in number of reads for each assigned ASVin both the mock communities and bulk-DNA samples. Bulk-DNA showed a signifi-cantly higher species richness than their associated eDNA samples, and also detectedadditional species to what was already reported at the specific sites. Our study con-firms that metabarcoding using the foraminiferal COI marker adequately retrieves thediversity and community composition of both the mock communities and the bulk-DNA samples. With its decreased variability compared with the commonly used nu-clear 18 S rRNA, the COI marker renders bulk-DNA metabarcoding a powerful tool toassess foraminiferal community composition under the condition that the referencedatabase is adequate to the target taxa.
    Keywords: bulk-sample ; DNA ; community composition ; coral reef ; environmental DNA ; foraminifera ; metabarcoding
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 13
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    Dynamics of large benthic foraminiferal assemblages: A tool to foreshadow reef degradation? (2022)
    Elsevier BV
    In:  Science of The Total Environment vol. 811 no. 151396
    Details
    Publication Date: 2024-05-24
    Description: Ecological regime shifts in the marine realm have been recorded from a variety of systems and locations around the world. Coral reefs have been especially affected, with their benthic habitat changing from a dominance of stony corals to a dominance of other organisms such as fleshy algae. To detect changes in the benthic habitat of coral reefs, simple tools applicable on a global scale are necessary for future monitoring programs. Hence, the aim of this research is to explore the hypothesis that shifts in assemblages of large benthic foraminifera (LBF) can detect early signs of degradation in the reef benthic habitat. To do so, data on living assemblages of LBF collected between 1997 and 2018 at 12 islands in the Spermonde Archipelago (South Sulawesi, Indonesia) were analyzed. Foraminiferal specimens were morphologically identified to the species level and statistical analyses performed to assess changes in their assemblage composition. A clear temporal shift was observed. Typical foraminiferal assemblages in a coral-dominated (e.g., Amphistegina lobifera, Calcarina spengleri, Heterostegina depressa) and fleshy algaedominated (e.g., Neorotalia gaimardi, C. mayori) reef habitats were identified and significantly linked to the substrate type. Other species (e.g., Elphidium spp., Peneroplis planatus and Sphaerogypsina globulus) seem to reflect a spatial and temporal gradient of anthropogenic pollution from local inhabited islands and ongoing urban development on the mainland. Hence communities of LBF consistently follow gradual shifts in environmental conditions. Additionally to foraminiferal assemblages being an indicator for actual reef condition, closely monitoring LBF may provide early information on reef degradation, in time to take action against identified stressors (e.g., eutrophication or intensive fishing) at local and regional scales. The circumtropical distribution of LBF is such that they can be included worldwide in reef monitoring programs, conditional to calibration to the regional species pool.
    Keywords: Temporal dynamics ; Bioindicator ; Early detection ; Coral reef ; Spermonde Archipelago ; Indonesia
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 14
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    Mitochondrial cytochrome c oxidase subunit I (COI) metabarcoding of Foraminifera communities using taxon-specific primers (2022)
    PeerJ
    In:  PeerJ vol. 10 no. e13952
    Details
    Publication Date: 2024-05-24
    Description: Foraminifera are a species-rich phylum of rhizarian protists that are highly abundant in most marine environments. Molecular methods such as metabarcoding have revealed a high, yet undescribed diversity of Foraminifera. However, so far only one molecular marker, the 18S ribosomal RNA, was available for metabarcoding studies on Foraminifera. Primers that allow amplification of foraminiferal mitochondrial cytochrome oxidase I (COI) and identification of Foraminifera species were recently published. Here we test the performance of these primers for the amplification of whole foraminiferal communities, and compare their performance to that of the highly degenerate LerayXT primers, which amplify the same COI region in a wide range of eukaryotes. We applied metabarcoding to 48 samples taken along three transects spanning a North Sea beach in the Netherlands from dunes to the low tide level, and analysed both sediment samples and meiofauna samples, which contained taxa between 42 mm and 1 mm in body size obtained by decantation from sand samples. We used single-cell metabarcoding (Girard et al., 2022) to generate a COI reference library containing 32 species of Foraminifera, and used this to taxonomically annotate our community metabarcoding data. Our analyses show that the highly degenerate LerayXT primers do not amplify Foraminifera, while the Foraminifera primers are highly Foraminifera- specific, with about 90% of reads assigned to Foraminifera and amplifying taxa from all major groups, i.e., monothalamids, Globothalamea, and Tubothalamea. We identified 176 Foraminifera ASVs and found a change in Foraminifera community composition along the beach transects from high tide to low tide level, and a dominance of single-chambered monothalamid Foraminifera. Our results highlight that COI metabarcoding can be a powerful tool for assessing Foraminiferal communities.
    Keywords: Foraminifera ; Metabarcoding ; Beach ; Community composition ; Intertidal ; Molecular ; biodiversity
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 15
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    Master tracks of the HALO research aircraft during the HALO-(AC)³ field campaign in 1 Hz temporal resolution (2024)
    PANGAEA
    Details
    Publication Date: 2024-05-24
    Description: During the HALO-(AC)³ campaign in March-April 2022 airborne observations were performed with the High Altitude and LOng range research aircraft (HALO) covering the Fram Strait and north polar regions. The flight tracks covered open ocean areas, the marginal sea ice zone, and closed sea ice cover. Furthermore, cloud conditions were observed during air mass transformation events as marine cold air outbreaks and warm air intrusions. This data set summarizes the flight tracks of HALO and provides longitude, latitude, and altitude defined as position above WGS84. All data are measured by the Basic HALO Measurement and Data System (BAHAMAS) and resampled to 1 Hz temporal resolution.
    Keywords: AC3; airborne; Arctic; Arctic Amplification; Atmospheric and Earth System Research with HALO – High Altitude and Long Range Research Aircraft; GPS; HALO; HALO-(AC)³; SPP1294; track
    Type: Dataset
    Format: application/zip, 17 datasets
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  • 16
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    Macroalgal responses to ocean acidification depend on nutrient and light levels (2015)
    PANGAEA
    In:  Supplement to: Celis-Plá, Paula S M; Hall-Spencer, Jason M; Horta, Paulo Antunes; Milazzo, Marco; Korbee, Nathalie; Cornwall, Christopher Edward; Figueroa, Félix L (2015): Macroalgal responses to ocean acidification depend on nutrient and light levels. Frontiers in Marine Science, 2, https://doi.org/10.3389/fmars.2015.00026
    Details
    Publication Date: 2024-05-24
    Description: Ocean acidification may benefit algae that are able to capitalize on increased carbon availability for photosynthesis, but it is expected to have adverse effects on calcified algae through dissolution. Shifts in dominance between primary producers will have knock-on effects on marine ecosystems and will likely vary regionally, depending on factors such as irradiance (light vs. shade) and nutrient levels (oligotrophic vs. eutrophic). Thus experiments are needed to evaluate interactive effects of combined stressors in the field. In this study, we investigated the physiological responses of macroalgae near a CO2 seep in oligotrophic waters off Vulcano (Italy). The algae were incubated in situ at 0.2 m depth using a combination of three mean CO2 levels (500, 700-800 and 1200 µatm CO2), two light levels (100 and 70% of surface irradiance) and two nutrient levels of N, P, and K (enriched vs. non-enriched treatments) in the non-calcified macroalga Cystoseira compressa (Phaeophyceae, Fucales) and calcified Padina pavonica (Phaeophyceae, Dictyotales). A suite of biochemical assays and in vivo chlorophyll a fluorescence parameters showed that elevated CO2 levels benefitted both of these algae, although their responses varied depending on light and nutrient availability. In C. compressa, elevated CO2 treatments resulted in higher carbon content and antioxidant activity in shaded conditions both with and without nutrient enrichment--they had more Chla, phenols and fucoxanthin with nutrient enrichment and higher quantum yield (Fv/Fm) and photosynthetic efficiency (alpha ETR) without nutrient enrichment. In P. pavonica, elevated CO2 treatments had higher carbon content, Fv/Fm, alpha ETR, and Chla regardless of nutrient levels--they had higher concentrations of phenolic compounds in nutrient enriched, fully-lit conditions and more antioxidants in shaded, nutrient enriched conditions. Nitrogen content increased significantly in fertilized treatments, confirming that these algae were nutrient limited in this oligotrophic part of the Mediterranean. Our findings strengthen evidence that brown algae can be expected to proliferate as the oceans acidify where physicochemical conditions, such as nutrient levels and light, permit.
    Keywords: Alkalinity, total; Alkalinity, total, standard error; Antioxidant activity; Antioxidant activity, standard error; Aragonite saturation state; Aragonite saturation state, standard error; Benthos; Bicarbonate ion; Bicarbonate ion, standard error; Biomass/Abundance/Elemental composition; Calcite saturation state; Calcite saturation state, standard error; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, per dry mass; Carbon/Nitrogen ratio; Carbon/Nitrogen ratio, standard error; Carbonate ion; Carbonate ion, standard error; Carbonate system computation flag; Carbon content, per dry mass, standard error; Carbon dioxide; Carbon dioxide, standard error; Chlorophyll a; Chlorophyll a, standard error; Chlorophyll c; Chlorophyll c, standard error; Chromista; CO2 vent; Coast and continental shelf; Cystoseira compressa; Electron transport rate; Electron transport rate, standard error; Field experiment; Fucoxanthin; Fucoxanthin, standard error; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Light saturation point; Light saturation point, standard error; Macroalgae; Macro-nutrients; Maximum photochemical quantum yield of photosystem II; Maximum photochemical quantum yield of photosystem II, standard error; Mediterranean Sea; Nitrogen, per dry mass; Nitrogen content, per dry mass, standard error; Non photochemical quenching; Non photochemical quenching, standard error; OA-ICC; Ocean Acidification International Coordination Centre; Ochrophyta; Padina pavonica; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Partial pressure of carbon dioxide (water) at sea surface temperature (wet air), standard error; pH; pH, standard error; Phenolics, all; Phenolics, all, standard error; Photosynthetic efficiency; Photosynthetic efficiency, standard error; Potentiometric; Potentiometric titration; Primary production/Photosynthesis; Salinity; Salinity, standard error; Single species; Species; Temperate; Temperature; Temperature, water; Temperature, water, standard error; Treatment; Violaxanthin; Violaxanthin, standard error
    Type: Dataset
    Format: text/tab-separated-values, 1470 data points
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  • 17
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    Seawater carbonate chemistry and growth rate, primary production of Cystoseira tamariscifolia (Phaeophyceae) in laboratory experiment (2017)
    PANGAEA
    In:  Supplement to: Celis-Plá, Paula S M; Martínez, Brezo; Korbee, Nathalie; Hall-Spencer, Jason M; Figueroa, Félix L (2017): Ecophysiological responses to elevated CO2 and temperature in Cystoseira tamariscifolia (Phaeophyceae). Climatic Change, 142(1-2), 67-81, https://doi.org/10.1007/s10584-017-1943-y
    Details
    Publication Date: 2024-05-24
    Description: Ocean acidification increases the amount of dissolved inorganic carbon (DIC) available in seawater which can benefit photosynthesis in those algae that are currently carbon limited, leading to shifts in the structure and function of seaweed communities. Recent studies have shown that ocean acidification-driven shifts in seaweed community dominance will depend on interactions with other factors such as light and nutrients. The study of interactive effects of ocean acidification and warming can help elucidate the likely effects of climate change on marine primary producers. In this study, we investigated the ecophysiological responses of Cystoseira tamariscifolia (Hudson) Papenfuss. This large brown macroalga plays an important structural role in coastal Mediterranean communities. Algae were collected from both oligotrophic and ultraoligotrophic waters in southern Spain. They were then incubated in tanks at ambient (ca. 400-500 ppm) and high CO2 (ca. 1200-1300 ppm), and at 20 °C (ambient temperature) and 24 °C (ambient temperature +4 °C). Increased CO2 levels benefited the algae from both origins. Biomass increased in elevated CO2 treatments and was similar in algae from both origins. The maximal electron transport rate (ETRmax), used to estimate photosynthetic capacity, increased in ambient temperature/high CO2 treatments. The highest polyphenol content and antioxidant activity were observed in ambient temperature/high CO2 conditions in algae from both origins; phenol content was higher in algae from ultraoligotrophic waters (1.5-3.0%) than that from oligotrophic waters (1.0-2.2%). Our study shows that ongoing ocean acidification can be expected to increase algal productivity (ETRmax), boost antioxidant activity (EC50), and increase production of photoprotective phenols. Cystoseira tamariscifolia collected from oligotrophic and ultraoligotrophic waters were able to benefit from increases in DIC at ambient temperatures. Warming, not acidification, may be the key stressor for this habitat as CO2 levels continue to rise.
    Keywords: Alkalinity, total; Alkalinity, total, standard error; Antioxidant activity; Antioxidant activity, standard error; Aragonite saturation state; Benthos; Bicarbonate ion; Bicarbonate ion, standard error; Bottles or small containers/Aquaria (〈20 L); Cabo_de_Gata_Nija; Calcite saturation state; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, per dry mass; Carbonate ion; Carbonate ion, standard error; Carbonate system computation flag; Carbon content, per dry mass, standard error; Carbon dioxide; Carbon dioxide, standard error; Chromista; Coast and continental shelf; Cystoseira tamariscifolia; Event label; EXP; Experiment; Experiment duration; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Growth rate; Growth rate, standard error; La_Arana; Laboratory experiment; Location; Macroalgae; Maximal electron transport rate; Maximal electron transport rate, standard error; Mediterranean Sea; Nitrate; Nitrate, standard error; Nitrogen, per dry mass; Nitrogen content, per dry mass, standard error; OA-ICC; Ocean Acidification International Coordination Centre; Ochrophyta; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Partial pressure of carbon dioxide (water) at sea surface temperature (wet air), standard error; pH; pH, standard error; Phenolics, all; Phenolics, all, standard error; Phosphate; Phosphate, standard error; Potentiometric; Potentiometric titration; Primary production/Photosynthesis; Registration number of species; Salinity; Salinity, standard error; Single species; Species; Temperate; Temperature; Temperature, water; Temperature, water, standard error; Time point, descriptive; Treatment; Type; Uniform resource locator/link to reference
    Type: Dataset
    Format: text/tab-separated-values, 3752 data points
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  • 18
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    Benthic N2 production rates (denitrification, anammox), sediment characteristics and silicate in coastal sediments of the Vistula Estuary and the Bay of Gdansk during 3 seasons (winter, sping, summer) (2017)
    PANGAEA
    Details
    Publication Date: 2024-05-24
    Description: Sediment samples for measuring N2 production rates and for the characterization of the sediment system were taken in three seasons (winter, spring, summer) from sand and mud sediments of the Vistula Estuary and the open Bay of Gdansk at the Polish coast, Southern Baltic Sea. Sediment was sampled with a HAPS bottom corer (coarse sand), a Multicorer and a Boxcorer (fine sand, mud). Porosity was analyzed both from sediment slices and from entire core subsamples, which means that sediment in a sampling core (heights 15-20 cm, iD 2.3 cm) was mixed and sub sampled, assuming vertical homogeneity; sediment was dried overnight at 105°C and calculations followed Burdige (2006). Sediment organic matter content was analyzed as loss on ignition (LOI), for which dried sediment was combusted at 550°C for 4h. Sediment permeability was measured from pooled surface sediments (~1-2 cm homogeneous surface layer) with a permeameter cell following the constant head method for laminar flow of water through granular soil; calculations were derived from Darcy's Law. The oxygen penetration depth (OPD) was determined by manual (EMB 77, AL 449) and automated (EMB 123) profiling at bottom water temperature, electrode tip 100 µm: EMB 123, AL 449 (mud) and 250 µm: EMB 77, AL 449 (sand), EMB 123 (VE05, VE49). Denitrification rates were measured with the revised isotope pairing technique (r-IPT; Risgaard-Petersen et al. 2003, 2004) that accounts for the potential contribution of anammox (anaerobic ammonium oxidation) to total N2 production. Incubations were done in acrylic cores (heights 15-20 cm, iD 2.3 cm) in a concentration series of 30, 60, 90, 120 µM 15NO3- (n=3, EMB 77, AL 449) and 40 (n=4), 80 (n=4), 120 (n=12) µM 15NO3- for 3-5h at in situ bottom water temperature and darkness. In the presence of significant advective pore water flow, an advective incubation design was used. Dw gives denitrification of nitrate from the water column; Dn gives denitrification of nitrate from sediment nitrification (coupled nitrification-denitrification). If no contribution of anammox to total N2 production was found, columns hold a zero (0). The sediment silicate content (ASi =amorphous, biogenic Si (Na2CO3-extractable), Ca-Si = easily available Si (CaCl2-extractable), Ox-Si = oxide-bound Si (extractable by acid oxalate)) was analyzed from the top sediment layer.
    Keywords: after Risgaard-Petersen et al. 2003 (r-IPT); Amorphous, biogenic silicate, per dry mass; Anammox rates; Calcium extractable silicate, per dry mass; Calculation according to Burdige 2006; Comment; Cruise/expedition; Date/Time of event; Depth, description; DEPTH, water; Description; Event label; Latitude of event; Longitude of event; Loss on ignition; MULT; Multiple investigations; Nitrate denitrification, total; Nitrate denitrification from sediment nitrification; Nitrate denitrification from water column; Oxide bound silicate, per dry mass; Oxygen penetration depth; Permeability (earth science); Porosity; Sediment type; Station label; Vistula_estuary_20140705-VE15; Vistula_estuary_20140707-VE02; Vistula_estuary_20140707-VE46; Vistula_estuary_20140707-VE53; Vistula_estuary_20140708-VE03; Vistula_estuary_20140708-VE05; Vistula_estuary_20140709-VE09; Vistula_estuary_20140709-VE13; Vistula_estuary_20140710-VE18; Vistula_estuary_20140710-VE23; Vistula_estuary_20140710-VE23a; Vistula_estuary_20140710-VE24; Vistula_estuary_20140711-VE49a; Vistula_estuary_20140712-VE38; Vistula_estuary_20140713-TF0233; Vistula_estuary_20140713-VE43; Vistula_estuary_20140714-VE39; Vistula_estuary_20150201-VE04; Vistula_estuary_20150201-VE05; Vistula_estuary_20150201-VE06; Vistula_estuary_20150202-VE07; Vistula_estuary_20150203-VE10; Vistula_estuary_20150204-VE02; Vistula_estuary_20150205-TF0233; Vistula_estuary_20150205-VE38; Vistula_estuary_20150205-VE39; Vistula_estuary_20150206-VE09; Vistula_estuary_20150206-VE13; Vistula_estuary_20150207-VE49a; Vistula_estuary_20150209-VE02; Vistula_estuary_20160229-VE07; Vistula_estuary_20160301-VE06; Vistula_estuary_20160302-VE04; Vistula_estuary_20160303-VE18; Vistula_estuary_20160304-VE38; Vistula_estuary_20160305-VE13; Vistula_estuary_20160305-VE15; Vistula_estuary_20160306-VE09; Vistula_estuary_20160307-VE05; Vistula_estuary_20160308-VE02; Vistula_estuary_20160309-VE49a; Vistula River, Poland
    Type: Dataset
    Format: text/tab-separated-values, 2597 data points
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  • 19
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    Data to Impact of ocean acidification on thermal tolerance and acid-base regulation of Mytilus edulis from the White Sea (2018)
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven | Supplement to: Zittier, Zora M C; Bock, Christian; Sukhotin, Alexey A; Häfker, N Sören; Pörtner, Hans-Otto (2018): Impact of ocean acidification on thermal tolerance and acid–base regulation of Mytilus edulis from the White Sea. Polar Biology, 41(11), 2261-2273, https://doi.org/10.1007/s00300-018-2362-x
    Details
    Publication Date: 2024-05-24
    Description: Ocean warming and acidification are two important environmental drivers affecting marine organisms. Organisms living at high latitudes might be especially threatened in near future, as current environmental changes are larger and occur faster. Therefore, we investigated the effect of hypercapnia on thermal tolerance and physiological performance of sub-Arctic Mytilus edulis from the White Sea. Mussels were exposed (2 weeks) to 390 µatm (control) and 1,120 µatm CO2 (year 2100) before respiration rate (MO2), anaerobic metabolite (succinate) level, haemolymph acid-base status, and intracellular pH (pHi) were determined during acute warming (10-28°C, 3°C over night). In normocapnic mussels, warming induced MO2 to rise exponentially until it levelled off beyond a breakpoint temperature of 20.5°C. Concurrently, haemolymph PCO2 rose significantly 〉19°C followed by a decrease in PO2 indicating the pejus temperature (TP, onset of thermal limitation). Succinate started to accumulate at 28°C under normocapnia defining the critical temperature (TC). pHi was maintained during warming until it dropped at 28°C, in line with the concomitant transition to anaerobiosis. At acclimation temperature, CO2 had only a minor impact. During warming, MO2 was stimulated by CO2 resulting in an elevated breakpoint of 25.8°C. Nevertheless, alterations in haemolymph gases (〉16°C) and the concomitant changes of pHi and succinate level (25°C) occurred at lower temperature under hypercapnia versus normocapnia indicating a downward shift of both thermal limits TP and TC by CO2. Compared to temperate conspecifics, sub-Arctic mussels showed an enhanced thermal sensitivity, exacerbated further by hypercapnia, indicating their potential vulnerability to environmental changes projected for 2100.
    Keywords: 1H NMR spectroscopy; Blood gas analyser, Eschweiler, MT 33; Calculated after Heisler 1986; EPOCA; EPOCA_White_Sea; European Project on Ocean Acidification; EXP; Experiment; Experimental treatment; Gas chromatography; Homogenate method by Pörtner et al. 1990 and pH optode, PreSens, Needle-Type-Housing-pH-Microsensor; Individual code; Mytilus edulis, extrapallial fluid carbon dioxide; Mytilus edulis, extrapallial fluid partial pressure of carbon dioxide; Mytilus edulis, extrapallial fluid partial pressure of oxygen; Mytilus edulis, extrapallial fluid pH; Mytilus edulis, haemolymph, bicarbonate ion; Mytilus edulis, haemolymph, carbon dioxide; Mytilus edulis, haemolymph, partial pressure of carbon dioxide; Mytilus edulis, haemolymph, partial pressure of oxygen; Mytilus edulis, haemolymph, pH; Mytilus edulis, mantle tissue, bicarbonate ion; Mytilus edulis, mantle tissue, carbon dioxide; Mytilus edulis, mantle tissue, partial pressure of carbon dioxide; Mytilus edulis, mantle tissue, pH; Mytilus edulis, mantle tissue, succinate; Oxygen optode, flow-through respirometry; Respiration rate, oxygen, per dry mass; Salinity; Temperature, water; White Sea
    Type: Dataset
    Format: text/tab-separated-values, 2034 data points
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  • 20
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    Data of ecophysiological response of Jania rubens (Corallinaceae) to ocean acidification (2019)
    PANGAEA
    In:  Supplement to: Porzio, Lucia; Buia, Maria-Cristina; Lorenti, Maurizio; Vitale, Ermenegilda; Amitrano, Chiara; Arena, Carmen (2018): Ecophysiological response of Jania rubens (Corallinaceae) to ocean acidification. Rendiconti Lincei-Scienze Fisiche E Naturali, 29, 543-546, https://doi.org/10.1007/s12210-018-0719-2
    Details
    Publication Date: 2024-05-24
    Description: Coralline algae (Rhodophyta) play a key role in promoting settlement of other benthic organisms, being the food source for herbivores, being involved in the stabilization of reef networks, and in carbonate production. They are considered a vulnerable group to ocean acidification due to the potential dissolution of their high-Mg calcite skeleton at lower pH. Nevertheless, different species of coralline algae showed different responses to low-pH/high-pCO2 environment. Here, we studied the physiological response of Jania rubens to the pH condition predicted for the year 2100. We used a natural CO2 vent system as natural laboratory to transplant J. rubens from pH 8.1–7.5 for 3 weeks. Maximal PSII photochemical efficiency showed a significant reduction in transplanted thalli at low pH (7.5-T) compared to other conditions; consistent with that result, also the pigments involved in the light-harvesting spectrum of J. rubens (i.e., chlorophylls, carotenoids, and phycobilins), exhibited a significant decrease under water acidification, highlighting the strong sensitivity of this species to the environmental change. A major understanding of the response of coralline algae at high CO2 will go through the impact of OA on benthic ecosystems in the next future. This contribution is the written, peer-reviewed version of a paper presented at the Conference “Changes and Crises in the Mediterranean Sea” held at Accademia Nazionale dei Lincei in Rome on October 17, 2017.
    Keywords: Carotenoids; Chlorophyll total, per mass; Maximum photochemical quantum yield of photosystem II; Phycocyanin; Phycoerythrin; Polyphenols, total, per fresh mass; Thallus carbonates, per dry mass; Treatment
    Type: Dataset
    Format: text/tab-separated-values, 218 data points
    Location Call Number Expected Availability
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