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  • Alkalinity, total; Animalia; Aragonite saturation state; Bicarbonate ion; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Cavolinia inflexa; Clio pyramidata; Cuvierina atlantica; Cuvierina pacifica; Diacria trispinosa; Experiment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Laboratory experiment; Limacina helicina; Limacina retroversa; Mass, standard error; Mollusca; North Atlantic; North Pacific; OA-ICC; Ocean Acidification International Coordination Centre; Open ocean; Oxygen; Oxygen consumption, per mass; Oxygen consumption, standard error; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; Replicates; Respiration; Salinity; Single species; Species, unique identification; Species, unique identification (Semantic URI); Species, unique identification (URI); Styliola subula; Temperate; Temperature, water; Treatment; Type; Wet mass; Zooplankton  (1)
  • Aquatic  (1)
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  • 1
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    Unknown
    Seawater carbonate chemistry and the metabolic response of thecosome pteropods from the North Atlantic and North Pacific oceans (2016)
    PANGAEA
    Details
    Publication Date: 2024-03-15
    Description: As anthropogenic activities directly and indirectly increase carbon dioxide (CO2) and decrease oxygen (O2) concentrations in the ocean system, it becomes important to understand how different populations of marine animals will respond. Water that is naturally low in pH, with a high concentration of carbon dioxide (hypercapnia) and a low concentration of oxygen, occurs at shallow depths (200–500 m) in the North Pacific Ocean, whereas similar conditions are absent throughout the upper water column in the North Atlantic. This contrasting hydrography provides a natural experiment to explore whether differences in environment cause populations of cosmopolitan pelagic calcifiers, specifically the aragonitic-shelled pteropods, to have a different physiological response when exposed to hypercapnia and low O2. Using closed-chamber end-point respiration experiments, eight species of pteropods from the two ocean basins were exposed to high CO2 (  800 µatm) while six species were also exposed to moderately low O2 (48 % saturated, or  130 µmol/kg) and a combined treatment of low O2/high CO2. None of the species tested showed a change in metabolic rate in response to high CO2 alone. Of those species tested for an effect of O2, only Limacina retroversa from the Atlantic showed a response to the combined treatment, resulting in a reduction in metabolic rate. Our results suggest that pteropods have mechanisms for coping with short-term CO2 exposure and that there can be interactive effects between stressors on the physiology of these open ocean organisms that correlate with natural exposure to low O2 and high CO2. These are considerations that should be taken into account in projections of organismal sensitivity to future ocean conditions.
    Keywords: Alkalinity, total; Animalia; Aragonite saturation state; Bicarbonate ion; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Cavolinia inflexa; Clio pyramidata; Cuvierina atlantica; Cuvierina pacifica; Diacria trispinosa; Experiment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Laboratory experiment; Limacina helicina; Limacina retroversa; Mass, standard error; Mollusca; North Atlantic; North Pacific; OA-ICC; Ocean Acidification International Coordination Centre; Open ocean; Oxygen; Oxygen consumption, per mass; Oxygen consumption, standard error; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; Replicates; Respiration; Salinity; Single species; Species, unique identification; Species, unique identification (Semantic URI); Species, unique identification (URI); Styliola subula; Temperate; Temperature, water; Treatment; Type; Wet mass; Zooplankton
    Type: Dataset
    Format: text/tab-separated-values, 800 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    Unknown
    The biogeochemistry of carbon across a gradient of streams and rivers within the Congo Basin (2014)
    John Wiley & Sons
    Details
    Publication Date: 2022-05-26
    Description: Author Posting. © American Geophysical Union, 2014. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Biogeosciences 119 (2014): 687–702, doi:10.1002/2013JG002442.
    Description: Dissolved organic carbon (DOC) and inorganic carbon (DIC, pCO2), lignin biomarkers, and theoptical properties of dissolved organic matter (DOM) were measured in a gradient of streams and rivers within the Congo Basin, with the aim of examining how vegetation cover and hydrology influences the composition and concentration of fluvial carbon (C). Three sampling campaigns (February 2010, November 2010, and August 2011) spanning 56 sites are compared by subbasin watershed land cover type (savannah, tropical forest, and swamp) and hydrologic regime (high, intermediate, and low). Land cover properties predominately controlled the amount and quality of DOC, chromophoric DOM (CDOM) and lignin phenol concentrations (∑8) exported in streams and rivers throughout the Congo Basin. Higher DIC concentrations and changing DOM composition (lower molecular weight, less aromatic C) during periods of low hydrologic flow indicated shifting rapid overland supply pathways in wet conditions to deeper groundwater inputs during drier periods. Lower DOC concentrations in forest and swamp subbasins were apparent with increasing catchment area, indicating enhanced DOC loss with extended water residence time. Surface water pCO2 in savannah and tropical forest catchments ranged between 2,600 and 11,922 µatm, with swamp regions exhibiting extremely high pCO2 (10,598–15,802 µatm), highlighting their potential as significant pathways for water-air efflux. Our data suggest that the quantity and quality of DOM exported to streams and rivers are largely driven by terrestrial ecosystem structure and that anthropogenic land use or climate change may impact fluvial C composition and reactivity, with ramifications for regional C budgets and future climate scenarios.
    Description: This work was supported by the National Science Foundation as part of the ETBC Collaborative Research: Controls on the Flux, Age, and Composition of Terrestrial Organic Carbon Exported by Rivers to the Ocean (0851101 and 0851015).
    Description: 2014-10-30
    Keywords: Dissolved organic matter ; Lignin ; CDOM ; pCO2 ; Aquatic ; Hydrology
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: text/richtext
    Format: application/vnd.ms-excel
    Format: application/pdf
    Location Call Number Limitation Availability
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    PAPER (OA)
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