Recent changes in invasive zebra mussel abundance in Gull Lake. Jeffrey D. White GLQO Annual Meeting 12 August 2014
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1 Recent changes in invasive zebra mussel abundance in Gull Lake Jeffrey D. White GLQO Annual Meeting 12 August 2014
2 Zebra mussels: background Introduced: 1980s from Europe/Asia Transported: ballast water (microscopic larvae) Veliger larvae (microscopic) Adults attach to surfaces Achieve high abundance Efficient filter feeders of phytoplankton p (algae) Adult Zebra mussel Dreissena polymorpha
3 Zebra mussels: background Biofouling of boats, pipes, and structures Re configuration of foodwebs (shunt energy from open water to the bottom) Pipe clogged with zebra mussels Elimination of native unionid mussels Increase toxic Microcystis cyanobacteria (blue green algae) Native unionid colonized by zebra mussels
4 Gull Lake One of 255Michigan inland lakes confirmed to have zebra mussels Zebra mussels first discovered in 1994
5 Gull Lake zebra mussels Populationdata from 1999 (0 25feet depth) ~2,000 mussels per square meter (~11 square feet) Population remained rather stable for 16 years 10, Ab bundance (m -2 ) 1, Diameter of a quarter Mussel size (mm) White and Sarnelle (2014, Freshwater Biology)
6 Gull Lake zebra mussels Historical i ldensity of zebra mussels nearshore in Gull Lake
7 Gull Lake zebra mussels Unprecedented, sudden die offinearlyaugust in early August, 2010 Nearly 100% died down to ~16 feet depth (mixed layer) Deeper, mussels survived & appeared healthy Recently dead zebra mussels retrieved from Gull Lake, MI (August 2010)
8 Shells of dead zebra mussels blanket the bottom of Gull Lake, MI after 2010 mass die off
9 What happened in Gull Lake? Invasivespecies species often fluctuate, orhave initiallyexplosive population growth followed by a decline to stable abundance Hudson River zebra mussels: long term trends in abundance Carlsson et al. (2011, Freshwater Biology) But the rapidity and sheer extent of the Gull Lake die off was surprising: is there more to that story than this?
10 What happened in Gull Lake? Environmental variables monitored in Gull Lake that might be important: Dissolved oxygen ph Calcium (required for shell building) All of these were normal in 2010, as compared to the ~10 year average Chlorophyll (algae mussel food) Water temperature 2010 was very warm: Gull Lake hit 84 F nearshore BUT temperature is always much cooler at 16+ feet
11 What happened in Gull Lake? Summer daily averageair temperature near Gull Lake (post zebra mussels) Temperature ( F) Year Data from Kellogg Biological Station s Long Term Ecological Research site
12 What happened in Gull Lake? Summer daily averageair temperature near Gull Lake (post zebra mussels) ature ( F) Temper Was 2010 too 72 F hot for the zebra mussels? Year Data from Kellogg Biological Station s Long Term Ecological Research site
13 Was it temperature? Death was ~100% at 6 feet in 2010 (warm summer die off ) Notable observation: over 1,000 hours of cumulative heat at or above 79 F during summer 2010 in the shallows hll 2010: 6 feet More data coming in just a few moments!
14 Gull Lake: caged mussels At the surface Going doooooown Study of zebra mussels stocked in cages in Gull Lake (May Oct) Temperature loggers In place on the bottom
15 Gull Lake: caged mussels 3 depths 6 ft: warmest; largest daily variation 16 ft: warm; 6 ft slightly less variation 30 ft 16 ft 30 ft: below the thermocline cool; l very little variation
16 What happened post die off? Summer daily averageair temperature near Gull Lake (post zebra mussels) 2010 (die off) 72 F Temperature ( F) caged mussel study Year Data from Kellogg Biological Station s Long Term Ecological Research site
17 Gull Lake: caged mussels Death rate 65 88% at 6 feet during warm summers (2011, 2012) Over 1,000 hours of cumulative heat at or above 79 F 2011: 6 feet 2012: 6 feet
18 Gull Lake: caged mussels Death rate only 48% at 6 feet during cooler summer (2013) ~600 hours of cumulative heat at or above 79 F 2013: 6 feet
19 Gull Lake: caged mussels Death rate only 0 9% at 30feet (cooler water temperatures) during all years (2011, 2012, 2013) Less than 200 hours of cumulative heat at or above 79 F 2011: 30 feet 2012: 30 feet 2013: 30 feet
20 Lab experiment Can the lake observations be recreated in the lab? Gull Lake zebra mussels Heated tanks targeting over 1,000 hours of accumulated heat at or above 79 F Unheated tanks (always below 79 F)
21 Lab experiment Death rate 71% in heated tanks (over 1,000hours of cumulative heat at or above 79 F) Death rate only 25% in unheated tanks (never above 79 F) 2014: heated tanks 2014: unheated tanks
22 Was it just Gull Lake? Have zebra mussels declined din other Michigan inland lakes during the same time period of observations from Gull Lake? October 2013: electronic surveys Michigan Lake & Stream Association (MLSA) Michigan Clean Water Corps (MiCorps)
23 Not just Gull Lake I observed a die off in to the point where mature mussels were rarely observed during the summer Dr. John Wilks, Indian Lake (Kalamazoo County) the zebra mussels have disappeared to the degree that it's almost safe to go in the water without shoes John Roberts, Burt Lake (Cheboygan County) August 2011 and 2012: Didn't have to look very hard to find them.august 2013: Unable to find any, even when actively looking Betse Stuart, Torch Lake (Antrim County) We have noted a die off of the zebra mussels in the lake over the last few years. We are very certain that their population is down Linda Davis, Payne Lake (Barry County)
24 Not just Gull Lake people around the lake have been commenting on how few mussels are on their docks Photo & quote from Julie Stivers, Stony Lake, MI, October 2013 (Oceana County)
25 Not just Gull Lake Reports received from 40 inland lakes all over the Lower Peninsula Declines or die offs observed in 33 (83%) of the cases during the period
26 On the rebound? this year they seem to be back, not in the numbers that were evident during the first infestations, but much more than the last two or three years Julie Stivers, Stony Lake (Oceana County) Photo from Dr. John Wilks, Indian Lake, MI, October 2013 (Kalamazoo County) [In] 2013, the population seemed to increase [from significantly ifi reduced dnumbers] ]but not to the extent of earlier Claudia Kerbawy, Lake Lansing (Ingham County)
27 Current status in Gull Lake Summer 2014: Highest abundance observed since the die off.but still below historical levels
28 Summary Gull Lake observations consistent withrecent high temperaturedriven die offs of zebra mussels Lab experiment with Gull Lake zebra mussels closely reproduces the lake observations Anecdotal reports from inland lakes around the Lower Peninsula point to obviousrecent declines of zebra mussels
29 Remain vigilant: don t spread invasive species
30 Thank you! Jeffrey White Dept. of Fisheries and Wildlife, MSU
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