Dissolved Oxygen in Lake Erie
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Dissolved Oxygen in Lake Erie

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DISSOLVED OXYGEN IN LAKE ERIE: ...

DISSOLVED OXYGEN IN LAKE ERIE:
TEMPORAL, SPATIAL,AND WEATHER-
INFLUENCED TRENDS IN THE CENTRAL BASIN, SANDUSKY SUBBASIN, AND WESTERN BASIN
Presented at Ohio Academy of Sciences, April 2012

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Dissolved Oxygen in Lake Erie Dissolved Oxygen in Lake Erie Presentation Transcript

  • DISSOLVED OXYGEN IN LAKE ERIE: TEMPORAL, SPATIAL,AND WEATHER-INFLUENCED TRENDS IN THE CENTRAL BASIN,SANDUSKY SUBBASIN, AND WESTERN BASIN Maya Hughes Maya C. Hughes1, Maya Hughes Phoenix Golnick1,2, and Douglas D. Kane1,2 1F.T. Stone Laboratory, Put-In-Bay OH 43456 and 2Natural Science and Mathematics Division, Defiance College, Defiance OH 43512
  • Outline Overview• Background of Hypoxia, Lake Erie, and Stratification• Purpose and Objectives• Weather (2010 and 2011)• Methods• Results• Why Important?
  • Hypoxia• Less than 2.0 mg/L of dissolved oxygen• World-wide problem• Changed drastically in short period of time • Increasing problem in estuarine water and shallow coasts • Accelerated by human activities
  • Hypoxia: Lake Erie• Historically, problem in the central basin• Nutrient loading• Summer stratification
  • Stratification
  • Stratification
  • Objectives1. Compare relationships between temperature, dissolved oxygen concentration, chlorophyll a concentration, and depth.2. Compare oxygen dynamics between western basin, Sandusky subbasin, and the central basin of Lake Erie.3. Compare oxygen dynamics and stratification of the three basins to observed rates in summer of 2010 in order to understand effects of weather.
  • WeatherComparison of 2010 and 2011March April May June
  • WeatherComparison of 2010 and 2011
  • Weather Comparison of 2010 and 2011 Number of storm events(defined as three or more hours of continuous wind speed greater than 7 m/s) (Steinhart et al. 2005)
  • Methods Methods• Sampled six sites in the Central basin, Sandusky subbasin, and western basin• Secchi Disk• Multiparameter sonde (every 0.5 m) : » Temperature (°C) » Dissolved Oxygen (mg/L) » Chlorophyll a (ug/L)
  • SitesSix Sites
  • Results:Hypoxia found earlierthis year- by a week
  • Results:Hypoxia in Western Basin (Kelleys Island Deep) and Sandusky Subbasin (Offshore)
  • Results: StratificationCentral Basin Western Basin Sandusky Subbasin
  • Results:Comparing 2010 to 2011 Depth of hypolimnion (m) Site (Month) 2010 2011 AP (June) 14.0 12.0 AP (July) 15.0 16.5 LO (June) 12.5 13.0 LO (July) 13.5 16.0 EAST (June) 10.0 14.0 EAST (July) 11.0 13.0 EAST (July) 12.0 13.0 SOFF (June) 10.0 13.5 SOFF (July) 10.0 13.0 SOFF (July) 11.0 12.5 KID (June) 12.0 13.0 KID (July) 12.0 11.0 KID (July) 12.0 13.0 Sites where start of hypolimnion was deeper in 2011 than 2010
  • Results:Hypolimnion Hypolimnionthickness depth• Significant • Significant difference in difference in hypolimnion hypolimnion thickness depth ~0.73 m ~1.42 m
  • Results• ANOVA:General Linear Model: Mean DO (mg/L) versus basin, year, month P Compared to α = 0.05 Basin 0.000 < 0.050 Month 0.000 < 0.050 Year 0.553 > 0.050 Basin*Year 0.020 <0.050 Year*Month 0.517 >0.050• Significant difference in dissolved oxygen between basins and months, but not between years
  • Conclusions• Hypoxia was found earlier this year than last summer (1 week)• Significant difference in stratification -Hypolimnion thinner -Hypolimnion deeper• Relationship between year and basin and dissolved oxygen • Central basin increased in dissolved oxygen • Sandusky Subbasin and western basin decreased
  • Hypoxia: Effect on Fish • Effect habitat quality • Influence metabolism, growth, reproduction, and behavior • Vertical and horizontal migration • Increase spatial overlap- predation and competition (Vanderploeg et al. 2009, Brandt et al. 2011, Arend et al. 2011)Round Goby Smallmouth Bass Yellow Perch Steelhead (Rainbow) Trout Walleye
  • Acknowledgments Friends of Stone Laboratory Dr. Jeff ReutterCaptains Russ Brohl and Matt Thomas Thank You
  • Hypoxia:Effect on Fish
  • Results: Interactions