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| Format: | Dataset Open Access |
| Sprache: | en |
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PANGAEA
2013
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| Online-Zugang: | https://doi.org/10.1594/PANGAEA.824706 |
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| _version_ | 1867170035814891520 |
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| author | Collard, Marie Laitat, Kim Moulin, Laure Catarino, Ana Isabel Grosjean, Philippe Dubois, Philippe |
| author_facet | Collard, Marie Laitat, Kim Moulin, Laure Catarino, Ana Isabel Grosjean, Philippe Dubois, Philippe |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The increase in atmospheric CO2 due to anthropogenic activity results in an acidification of the surface waters of the oceans. The impact of these chemical changes depends on the considered organisms. In particular, it depends on the ability of the organism to control the pH of its inner fluids. Among echinoderms, this ability seems to differ significantly according to species or taxa. In the present paper, we investigated the buffer capacity of the coelomic fluid in different echinoderm taxa as well as factors modifying this capacity. Euechinoidea (sea urchins except Cidaroidea) present a very high buffer capacity of the coelomic fluid (from 0.8 to 1.8 mmol/kg SW above that of seawater), while Cidaroidea (other sea urchins), starfish and holothurians have a significantly lower one (from -0.1 to 0.4 mmol/kg SW compared to seawater). We hypothesize that this is linked to the more efficient gas exchange structures present in the three last taxa, whereas Euechinoidea evolved specific buffer systems to compensate lower gas exchange abilities. The constituents of the buffer capacity and the factors influencing it were investigated in the sea urchin Paracentrotus lividus and the starfish Asterias rubens. Buffer capacity is primarily due to the bicarbonate buffer system of seawater (representing about 63% for sea urchins and 92% for starfish). It is also partly due to coelomocytes present in the coelomic fluid (around 8% for both) and, in P. lividus only, a compound of an apparent size larger than 3 kDa is involved (about 15%). Feeding increased the buffer capacity in P. lividus (to a difference with seawater of about 2.3 mmol/kg SW compared to unfed ones who showed a difference of about 0.5 mmol/kg SW) but not in A. rubens (difference with seawater of about 0.2 for both conditions). In P. lividus, decreased seawater pH induced an increase of the buffer capacity of individuals maintained at pH 7.7 to about twice that of the control individuals and, for those at pH 7.4, about three times. This allowed a partial compensation of the coelomic fluid pH for individuals maintained at pH 7.7 but not for those at pH 7.4. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_824706 |
| institution | PANGAEA |
| language | en |
| publishDate | 2013 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Seawater carbonate chemistry and buffer capacity of the coelomic fluid in echinoderms in a laboratory experiment Collard, Marie Laitat, Kim Moulin, Laure Catarino, Ana Isabel Grosjean, Philippe Dubois, Philippe Acid-base regulation; Alkalinity, total; Animalia; Aragonite saturation state; Asterias rubens; Benthic animals; Benthos; Bicarbonate ion; Calcite saturation state; Calculated; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Carbon dioxide (water), partial pressure, at equilibrator temperature (wet air); Coast and continental shelf; Coelomic fluid, alkalinity; Coelomic fluid, pH; Containers and aquaria (20-1000 L or < 1 m**2); Description; Difference; Duration, number of days; Echinaster sepositus; Echinocardium cordatum; Echinodermata; Echinometra mathaei; Eucidaris tribuloides; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Henricia oculata; Holothuria forskali; Holothuria tubulosa; Identification; Laboratory experiment; Not applicable; OA-ICC; Ocean acidification; Ocean Acidification International Coordination Centre; Other; Paracentrotus lividus; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH, total scale; Phyllacanthus imperialis; Potentiometric; Potentiometric titration; Remaining buffer capacity; Replicates; Salinity; Sample code/label; Single species; Species; Temperate; Temperature, water; Treatment; Tripneustes ventricosus; Tropical The increase in atmospheric CO2 due to anthropogenic activity results in an acidification of the surface waters of the oceans. The impact of these chemical changes depends on the considered organisms. In particular, it depends on the ability of the organism to control the pH of its inner fluids. Among echinoderms, this ability seems to differ significantly according to species or taxa. In the present paper, we investigated the buffer capacity of the coelomic fluid in different echinoderm taxa as well as factors modifying this capacity. Euechinoidea (sea urchins except Cidaroidea) present a very high buffer capacity of the coelomic fluid (from 0.8 to 1.8 mmol/kg SW above that of seawater), while Cidaroidea (other sea urchins), starfish and holothurians have a significantly lower one (from -0.1 to 0.4 mmol/kg SW compared to seawater). We hypothesize that this is linked to the more efficient gas exchange structures present in the three last taxa, whereas Euechinoidea evolved specific buffer systems to compensate lower gas exchange abilities. The constituents of the buffer capacity and the factors influencing it were investigated in the sea urchin Paracentrotus lividus and the starfish Asterias rubens. Buffer capacity is primarily due to the bicarbonate buffer system of seawater (representing about 63% for sea urchins and 92% for starfish). It is also partly due to coelomocytes present in the coelomic fluid (around 8% for both) and, in P. lividus only, a compound of an apparent size larger than 3 kDa is involved (about 15%). Feeding increased the buffer capacity in P. lividus (to a difference with seawater of about 2.3 mmol/kg SW compared to unfed ones who showed a difference of about 0.5 mmol/kg SW) but not in A. rubens (difference with seawater of about 0.2 for both conditions). In P. lividus, decreased seawater pH induced an increase of the buffer capacity of individuals maintained at pH 7.7 to about twice that of the control individuals and, for those at pH 7.4, about three times. This allowed a partial compensation of the coelomic fluid pH for individuals maintained at pH 7.7 but not for those at pH 7.4. |
| title | Seawater carbonate chemistry and buffer capacity of the coelomic fluid in echinoderms in a laboratory experiment |
| topic | Acid-base regulation; Alkalinity, total; Animalia; Aragonite saturation state; Asterias rubens; Benthic animals; Benthos; Bicarbonate ion; Calcite saturation state; Calculated; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Carbon dioxide (water), partial pressure, at equilibrator temperature (wet air); Coast and continental shelf; Coelomic fluid, alkalinity; Coelomic fluid, pH; Containers and aquaria (20-1000 L or < 1 m**2); Description; Difference; Duration, number of days; Echinaster sepositus; Echinocardium cordatum; Echinodermata; Echinometra mathaei; Eucidaris tribuloides; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Henricia oculata; Holothuria forskali; Holothuria tubulosa; Identification; Laboratory experiment; Not applicable; OA-ICC; Ocean acidification; Ocean Acidification International Coordination Centre; Other; Paracentrotus lividus; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH, total scale; Phyllacanthus imperialis; Potentiometric; Potentiometric titration; Remaining buffer capacity; Replicates; Salinity; Sample code/label; Single species; Species; Temperate; Temperature, water; Treatment; Tripneustes ventricosus; Tropical |
| url | https://doi.org/10.1594/PANGAEA.824706 |