summer habs in maryland chesapeake bay

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Summer HABs in Maryland Chesapeake Bay. + forecast assessment and other data. Prepared by: Richard Lacouture & Ann Marie Hartsig Morgan State University Estuarine Research Center and the data of Walter Butler MDDNR. Ben Longstaff & Cathy Wazniak. Microcystis aeruginosa in Potomac River. - PowerPoint PPT Presentation


  • Summer HABs in Maryland Chesapeake BayPrepared by: Richard Lacouture & Ann Marie HartsigMorgan State University Estuarine Research Centerand the data of Walter ButlerMDDNR+ forecast assessment and other dataBen Longstaff & Cathy Wazniak

  • Microcystis aeruginosa in Potomac RiverThe M. aeruginosa bloom in the Potomac River during the summer of 2008 was relatively intense and widespread for a short period of time.The bloom was first seen in a sample from Possum Point on 7/15. Densities increased slightly on 7/21 but not the areal extent of the bloom.The next sampling on 8/11 turned out to be the peak of the bloom both areally and in terms of cell numbers which peaked at ~100,000 cells/ml.The bloom dissipated somewhat on 8/18 both in terms of its spatial dimension and the density of cells in the surface layer.The bloom was virtually non-existent on 8/25 with the exception of Mattawoman Creek which still contained relatively low cell densities.Those cell densities persisted in Mattawoman Creek on 9/8. Toxicity tests taken from samples in early and mid-August indicate relatively high concentrations of the toxin, Microcystin. In addition, there were high densities of M. aeruginosa in the upper Transquaking River area (>40,000 cells/ml) on the Eastern Shore.

  • Microcystis Bloom- August8/19/08

  • Microcystin Results

    2005 2006 2007 Samples (n) 1220 13 Mean 39.521.3 42.3 Median 0.8 2.7 2.7 Standard Deviation 0.150.1 88.2 Minimum 0.1 0.1 0.29

    Maximum 357 208 288

  • Forecast - methodsPeter TangoChange in methods compared to previous yearsBased on % samples collected by MD DNR and river flow

  • Forecast - DNR sampling1 bloom sample collected on 8/11Observed large bloom in Mattawoman Crk: > 1 million cells per mlHealth warning by Charles Co Health Dept.

  • Forecast - accuracyBased on MD sampling over estimateConsider MSU sampling perfect!Change methods to include MSU data?

  • Karlodinium veneficum in MD Chesapeake Bay and tribsSummer, 2008 was a fairly mellow period for blooms of K. veneficum.June proved to be the peak bloom period with high densities in Patapsco River (>50,000/ml) and near the westernshore of the Bay across from the mouth of the Choptank River and in the Potomac River (>30,000/ml). There were a number of other areas with intermediate cell densities of this dinoflagellate during June.There was very little bloom activity in July.August and early-September were characterized by isolated blooms of fairly high densities in Patapsco River and Corsica River (>30,000/ml).

  • Two samples collected on April 29 and April 30 from station (XJI2396) at Budd's Landing on the Sassafras River had high cell counts of Pseudoanabaena (3,317,421 cells/ml and 3,843,251 cells/ml, respectively).

  • Prorocentrum - ForecastJon Anderson7 regionsCART analysis flow, clarity, temp and salinityBloom size - fuzzy logic

  • Prorocentrum - ForecastPatuxent River - late June to early JulyChoptank River and Bay Bridge late JuneNo blooms in the late summer and fall period

  • Prorocentrum BloomMahogany tidemid-April through May

    Potentially toxic dinoflagellateVenerupin Shellfish Poisoning (VSP)

    No fish kills 2008


  • 5/20/08

  • Prorocentrum - ObservedBased on the Eyes on the Bay websiteNo blooms (>4500cells/ml) in June August periodLow density counts in many of the areas predicted to have blooms


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