Short- and long-term conditioning of a temperate marine diatom community to acidification and warming

• Main Authors: Tatters, Avery O, Roleda, Michael Y, Schnetzer, Astrid, Fu, Feixue, Hurd, Catriona L, Boyd, Philip W, Caron, David A, Lie, Alle Y A, Hoffmann, L J, Hutchins, David A
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2013
• Subjects: Bottles or small containers/Aquaria <20 L; Chaetoceros criophilus; Coast and continental shelf; Community composition and diversity; Coscinodiscus sp.; Cylindrotheca fusiformis; Entire community; Growth/Morphology; Laboratory experiment; Navicula sp.; Pelagos; Pseudonitzschia delicatissima; South Pacific; Temperate; Temperature; Thalassiosira sp.; Species; Experiment; Temperature, water; Treatment; Sample ID; Incubation duration; Partial pressure of carbon dioxide water at sea surface temperature wet air; Cell density; Growth rate; Growth rate, standard deviation; Salinity; pH; pH, standard deviation; Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Partial pressure of carbon dioxide, standard deviation; Alkalinity, total; Alkalinity, total, standard deviation; Bicarbonate ion; Bicarbonate ion, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Calcite saturation state; Calcite saturation state, standard deviation; Aragonite saturation state; Aragonite saturation state, standard deviation; Carbonate system computation flag; Carbon dioxide; Fugacity of carbon dioxide water at sea surface temperature wet air; Spectrophotometric; Coulometric titration; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. 2010; Ocean Acidification International Coordination Centre OA-ICC; New Zealand; Pacific; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.835476; https://doi.pangaea.de/10.1594/PANGAEA.835476

Ocean acidification and greenhouse warming will interactively influence competitive success of key phytoplankton groups such as diatoms, but how long-term responses to global change will affect community structure is unknown. We incubated a mixed natural diatom community from coastal New Zealand waters in a short-term (two-week) incubation experiment using a factorial matrix of warming and/or elevated pCO2 and measured effects on community structure. We then isolated the dominant diatoms in clonal cultures and conditioned them for 1 year under the same temperature and pCO2 conditions from which they were isolated, in order to allow for extended selection or acclimation by these abiotic environmental change factors in the absence of interspecific interactions. These conditioned isolates were then recombined into 'artificial' communities modelled after the original natural assemblage and allowed to compete under conditions identical to those in the short-term natural community experiment. In general, the resulting structure of both the unconditioned natural community and conditioned 'artificial' community experiments was similar, despite differences such as the loss of two species in the latter. pCO2 and temperature had both individual and interactive effects on community structure, but temperature was more influential, as warming significantly reduced species richness. In this case, our short-term manipulative experiment with a mixed natural assemblage spanning weeks served as a reasonable proxy to predict the effects of global change forcing on diatom community structure after the component species were conditioned in isolation over an extended timescale. Future studies will be required to assess whether or not this is also the case for other types of algal communities from other marine regimes. : 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 2014-09-01.