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The impact of salinity fluctuations on net oxygen production and inorganic nitrogen uptake by Ulva lactuca (Chlorophyceae)
Lartigue, J.; Neill, A.; Hayden, B.L.; Pulfer, J.; Cebrian, J. (2003). The impact of salinity fluctuations on net oxygen production and inorganic nitrogen uptake by Ulva lactuca (Chlorophyceae). Aquat. Bot. 75(4): 339-350. dx.doi.org/10.1016/s0304-3770(02)00193-6
In: Aquatic Botany. Elsevier Science: Tokyo; Oxford; New York; London; Amsterdam. ISSN 0304-3770, more
Peer reviewed article  

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Keywords
    Ammonium compounds; Environmental effects; Estuarine front; Inorganic compounds; Oxygenation; Primary production; Salinity effects; Ulva lactuca Linnaeus, 1753 [WoRMS]; ASW, USA, Alabama, Mobile Bay [Marine Regions]; Marine; Brackish water

Authors  Top 
  • Lartigue, J.
  • Neill, A.
  • Hayden, B.L.
  • Pulfer, J.
  • Cebrian, J.

Abstract
    In this study, we investigate the impact of rapid fluctuations in salinity on short-term net oxygen production and ammonium (NH4+) and nitrate (NO3-) uptake by Ulva lactuca collected within the Mobile Bay estuary (AL). The salinity regime at the study site was highly variable, remaining mostly between 20 and 30 psu with changes over 3 psu occurring rapidly and frequently. Periodic water sampling revealed a significant inverse relationship between NO3- concentration and salinity, but not between NH4+ concentration and salinity. Experimental changes in salinity modelled on those observed at the study site resulted in a decline in net oxygen production, while NH4+ and NO3- uptake rates remained similar. These results suggest that U. lactuca maintains the ability to take up NH4+ and NO3- under conditions of rapidly changing salinity within the salinity range tested and over the short-term scale examined in this study.

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