Comparative diel oxygen cycles preceding and during a Karenia bloom in Sarasota Bay, Florida, USA

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...

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Bibliographic Details
Published in:Harmful algae 2014-09, Vol.38, p.95-100
Main Authors: Hitchcock, Gary L., Kirkpatrick, Gary, Lane, Peter V.Z., Langdon, Christopher
Format: Article
Language:English
Subjects:
Karenia
Karenia brevis
Net community production
Respiration
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Summary: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 104μmolO2l−1 with the corresponding nocturnal decrease in oxygen varying from 16 to 77μmolO2l−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.
ISSN:1568-9883
1878-1470
DOI:10.1016/j.hal.2014.05.010