EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021

(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)

<< BACK TO AGENDA

5/21/2018  |   11:15 AM - 11:30 AM   |  REDUCED FORMS OF NITROGEN ARE A DIVER OF NON-NITROGEN-FIXING cyanHABs AND TOXICITY IN LAKE ERIE   |  420 B

REDUCED FORMS OF NITROGEN ARE A DIVER OF NON-NITROGEN-FIXING cyanHABs AND TOXICITY IN LAKE ERIE

Western Lake Erie (WLE) experiences anthropogenic eutrophication and annual, toxic cyanobacterial blooms of non-nitrogen (N) fixing Microcystis. These blooms have been correlated with an increased proportion of soluble reactive phosphorus loading from the Maumee River. Here, we show that the proportion of the annual Maumee River N load of non-nitrate N, or total Kjeldahl nitrogen (TKN), has also increased significantly (p = 0.001) over the last few decades and is also significantly correlated to cyanobacterial bloom biomass (p = 0.003). We also compared the ratio of chemically reduced N to oxidized N (TKN:NO3) concentrations to extracted chlorophyll and phycocyanin concentrations from all stations within the NOAA GLERL weekly monitoring in WLE from 2009-2015. Both chlorophyll (p < 0.0001) and phycocyanin (p < 0.0001) were significantly correlated with TKN:NO3. This correlation between the increasing fraction of chemically reduced N from the Maumee River and increasing bloom biomass demonstrates the urgent need to control N loading, in addition to current P load reductions, to WLE and similar systems impacted by non-N-fixing, toxin-producing cyanobacteria.

  • Non-point Source
  • Nutrients
  • Eutrophication

Presentation:
This presentation has not yet been uploaded.

Handouts:
Handout is not Available

Transcripts:
CART transcripts are NOT YET available, but will be posted shortly after the conference


Presenters/Authors

Silvia E. Newell (), Wright State University, silvia.newell@wright.edu;


ASHA DISCLOSURE:

Financial -

Nonfinancial -

Timothy W. Davis (), Bowling Green State University, timdavi@bgsu.edu;


ASHA DISCLOSURE:

Financial -

Nonfinancial -

Tom Johengen (), Cooperative Institute for Great Lakes Research, tom.johengen@noaa.gov;


ASHA DISCLOSURE:

Financial -

Nonfinancial -

Duane Gossiaux (), NOAA Great Lakes Environmental Research Laboratory, duane.gossiaux@noaa.gov;


ASHA DISCLOSURE:

Financial -

Nonfinancial -

Ashley Burtner (), Cooperative Institute for Great Lakes Research, aburtner@umich.edu;


ASHA DISCLOSURE:

Financial -

Nonfinancial -

Danna Palladino (), Cooperative Institute for Great Lakes Research, danna.palladino@noaa.gov;


ASHA DISCLOSURE:

Financial -

Nonfinancial -

Mark McCarthy (), Wright State University, mjm.kingston@gmail.com;


ASHA DISCLOSURE:

Financial -

Nonfinancial -