Lecture5Phytoplankton Blooms

Lecture5Phytoplankton Blooms - Lecture 5: Phytoplankton...

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Lecture 5: Phytoplankton Blooms 1. What is a phytoplankton “bloom”? 2. What factors affect bloom formation? (light, nutrients, temperature); eutrophication and HABs 3. What is the fate of phytoplankton blooms?
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1. What is a phytoplankton bloom? Dictionary.com Bloom = A visible, colored area on the surface of bodies of water caused by excessive (phyto)planktonic growth. Microcystis bloom, Neuse River Estuary, NC An algal bloom is a rapid increase in the population of phytoplankton in an aquatic system (lakes, estuary, ocean). • cell numbers increase rapidly over time • rates of primary production are high Karenia bloom off Texas, W. Florida
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Blooms are not necessarily surface phenomena
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We have few reliable methods of directly determining growth rates on  natural populations Bloom dynamics = f (growth, grazing, physics ) 2. What factors affect bloom formation? A band of unusually dense aggregations of the buoyant diatom Rhizosolenia was observed at the convergence of the North Equatorial Countercurrent and the cooler, denser water of the South Equatorial Current.
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Blooms will form when growth rates exceed removal rates (e.g. grazing or death by viral lysis) What factors influence phytoplankton growth rate? light nutrients temperature (salinity)
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0 500 1000 1500 2000 5:00 6:40 8:20 10:00 11:40 13:20 15:00 16:40 18:20 Time of day Incident Irradiance, R/V Capricorn Neuse River Estuary July 1999 Light
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0 0.5 1 1.5 2 2.5 3 3.5 4 0 500 1000 1500 2000 7/7/99 1900h 7/8/99 0600h 7/8/99 0900h 7/8/99 1200h 7/8/99 1500h 7/8/99 1800h Irradiance (umol quanta m -2 s -1 ) kz e E E z - = 0 Neuse River Estuary July 1999
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Neuse River Estuary July 1999
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Aulacoseira baicalensis
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This note was uploaded on 12/12/2011 for the course BIOL 450 taught by Professor Ms.richardson during the Fall '10 term at South Carolina.

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Lecture5Phytoplankton Blooms - Lecture 5: Phytoplankton...

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