Net community production and dark community respiration in a Karenia brevis (Davis) bloom in West Florida coastal waters, USA

Gary L. Hitchcock, Gary Kirkpatrick, Peter Minnett, Valeriy Palubok

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Oxygen-based productivity and respiration rates were determined in West Florida coastal waters to evaluate the proportion of community respiration demands met by autotrophic production within a harmful algal bloom dominated by Karenia brevis. The field program was adaptive in that sampling during the 2006 bloom occurred where surveys by the Florida Wildlife Research Institute indicated locations with high cell abundances. Net community production (NCP) rates from light-dark bottle incubations during the bloom ranged from 10 to 42 μmole O2 L-1 day-1 with highest rates in bloom waters where abundances exceeded 105 cells L-1. Community dark respiration (R) rates in dark bottles ranged from <10 to 70 μmole O2 L-1 day-1 over 24 h. Gross primary production derived from the sum of NCP and R varied from ca. 20 to 120 μmole O2 L-1 day-1. The proportion of GPP attributed to NCP varied with the magnitude of R during day and night periods. Most surface communities exhibited net autotrophic production (NCP > R) over 24 h, although heterotrophy (NCP < R) characterized the densest sample where K. brevis cell densities exceed 106 cells L-1.

Original languageEnglish (US)
Pages (from-to)351-358
Number of pages8
JournalHarmful Algae
Volume9
Issue number4
DOIs
StatePublished - May 2010

Keywords

  • Florida
  • Karenia brevis
  • Net production
  • Respiration

ASJC Scopus subject areas

  • Aquatic Science
  • Plant Science

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