Comparative diel oxygen cycles preceding and during a Karenia bloom in Sarasota Bay,Florida, USA |
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| Institution: | 1. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Godoy Cruz 2320, C1425FQD Ciudad de Buenos Aires, Argentina;3. Centro para el Estudio de Sistemas Marinos (CESIMAR, CCT CONICET – CENPAT), Blvd. Alte. Brown 2915, Puerto Madryn U9120ACD, Chubut, Argentina;4. Laboratorio de Ictiología, FCEyN, Universidad Nacional de Mar del Plata (UNMdP), Funes 3350, B7602AYL Mar del Plata, Buenos Aires, Argentina;1. School of Biological, Earth and Environmental Sciences, University College Cork, Cork, Ireland;2. School of Biological Sciences, Victoria University of Wellington, Wellington, New Zealand;3. Beggars Knoll, Westbury, United Kingdom;4. Windmill Lane, Portaferry, Co. Down, Northern Ireland, United Kingdom;5. Oregon Institute of Marine Biology, University of Oregon, Charleston, OR, United States |
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| Abstract: | The diel change in dissolved oxygen concentrations were recorded with an automated incubator containing a pulsed oxygen sensor in Sarasota Bay, Florida. The deployments occurred during a ‘pre-bloom’ period in May to June 2006, and during a harmful algal bloom dominated by Karenia brevis in September 2006. The diurnal (daylight) increase in dissolved oxygen concentrations varied from 16 to 104 μmol O2 l−1 with the corresponding nocturnal decrease in oxygen varying from 16 to 77 μmol O2 l−1. Nocturnal respiration consumed 42–113% of the diurnal net oxygen production with the minimum and maximum during the pre-bloom period. Hourly production rates closely followed fluctuations in irradiance with maximum rates in the late morning. Hourly oxygen utilization rates (community respiration) at night were highest during the first few hours after sunset. |
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| Keywords: | Net community production Respiration |
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