Laverock, Bonnie; Kitidis, Vassilis; Tait, Karen; Gilbert, Jack Anthony; Osborn, A M; Widdicombe, Stephen (2013): Bioturbation determines the response of benthic ammonia-oxidizing microorganisms to ocean acidification [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.835499
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Abstract:
Ocean acidification (OA), caused by the dissolution of increasing concentrations of atmospheric carbon dioxide (CO2) in seawater, is projected to cause significant changes to marine ecology and biogeochemistry. Potential impacts on the microbially driven cycling of nitrogen are of particular concern. Specifically, under seawater pH levels approximating future OA scenarios, rates of ammonia oxidation (the rate-limiting first step of the nitrification pathway) have been shown to dramatically decrease in seawater, but not in underlying sediments. However, no prior study has considered the interactive effects of microbial ammonia oxidation and macrofaunal bioturbation activity, which can enhance nitrogen transformation rates. Using experimental mesocosms, we investigated the responses to OA of ammonia oxidizing microorganisms inhabiting surface sediments and sediments within burrow walls of the mud shrimp Upogebia deltaura. Seawater was acidified to one of four target pH values (pHT 7.90, 7.70, 7.35 and 6.80) in comparison with a control (pHT 8.10). At pHT 8.10, ammonia oxidation rates in burrow wall sediments were, on average, fivefold greater than in surface sediments. However, at all acidified pH values (pH < = 7.90), ammonia oxidation rates in burrow sediments were significantly inhibited (by 79-97%; p < 0.01), whereas rates in surface sediments were unaffected. Both bacterial and archaeal abundances increased significantly as pHT declined; by contrast, relative abundances of bacterial and archaeal ammonia oxidation (amoA) genes did not vary. This research suggests that OA could cause substantial reductions in total benthic ammonia oxidation rates in coastal bioturbated sediments, leading to corresponding changes in coupled nitrogen cycling between the benthic and pelagic realms.
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Related to:
Laverock, Bonnie; Kitidis, Vassilis; Tait, Karen; Gilbert, Jack Anthony; Osborn, A M; Widdicombe, Stephen (2013): Bioturbation determines the response of benthic ammonia-oxidizing microorganisms to ocean acidification. Philosophical Transactions of the Royal Society B-Biological Sciences, 368(1627), 20120441-20120441, https://doi.org/10.1098/rstb.2012.0441
Original version:
Laverock, Bonnie; Kitidis, Vassilis; Tait, Karen; Gilbert, Jack Anthony; Osborn, A M; Widdicombe, Stephen (2013): Data from: Bioturbation determines the response of benthic ammonia oxidising microorganisms to ocean acidification. Dryad Digital Repository, https://doi.org/10.5061/DRYAD.B98M6
Further details:
Lavigne, Héloïse; Epitalon, Jean-Marie; Gattuso, Jean-Pierre (2014): seacarb: seawater carbonate chemistry with R. R package version 3.0. https://cran.r-project.org/package=seacarb
Project(s):
Coverage:
Latitude: 50.346000 * Longitude: -4.127000
Date/Time Start: 2009-09-29T00:00:00 * Date/Time End: 2009-10-01T00:00:00
Minimum DEPTH, sediment, experiment: 0.00 m * Maximum DEPTH, sediment, experiment: 0.26 m
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Comment:
In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne et al, 2014) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). The date of carbonate chemistry calculation is 2014-09-03.
Parameter(s):
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
13415 data points
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