a decade of lake michigan nearshore ecosystem change€¦ · a decade of lake michigan nearshore...
TRANSCRIPT
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A decade of Lake Michigan nearshore ecosystem change:
observations from Sleeping Bear Dunes
Brenda Lafrancois, Harvey Bootsma, Emily Tyner, Sue Jennings, Dan Ray, Jay Glase, Chris Otto
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What happens when the most beautiful place in America
is confronted with some of the most dramatic changes in
Lake Michigan’s history?
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Overview
• Part I – A chronology of ecosystem change • Part II – Management and scientific response • Part III – Toward a new stewardship
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Overview
• Part I – A chronology of ecosystem change • Part II – Scientific and management response • Part III – Toward a new stewardship
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North Manitou Island, SLBE, August 2004
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South Manitou Island, SLBE, August 2005
“The person who grabbed the sample said it smelled just like human waste when he gathered
the sample from the back of the boat.” - S. Yancho, Aug 2005
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“I had heard a bit about possible Cladophora problems on the Michigan side of the lake, but I was not aware of how severe the problem is... it appears that some parts of the Manitou Island shoreline have as much Cladophora as we do along the Wisconsin shoreline…” - H. Bootsma, Jan 2006
North Manitou Island, SLBE, Aug 2012
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“What was really interesting was as we were flying over Lake Michigan from the mainland to the Islands the bottom was easily seen for most of the flight. It was almost a continuous patchwork of green.” - S. Yancho, Jan 2006
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“This is most likely the domino effect of zebra mussels.” - S. Paulic, Aug 2005
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August 2006
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“It just wasn't native. Nearly everything I looked at was an invasive species in and of itself, or was facilitated by one.“
– B. Lafrancois
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“A matter of time”
“Domino effect”
“Not a rosy picture”
"The lake is changing faster than we can study it.” – H. Bootsma, Jul 2008
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Photo: A. Van Zoeren
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Photo: A. Van Zoeren
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Photo: A. Van Zoeren
“Sleeping Bear Dunes is key to Piping Plover survival, since we continue to provide habitat and protection to a third of the entire population. While we can mitigate some threats, large scale ecosystem shifts are much more daunting, if not impossible to contend with.” – Sue Jennings, SLBE wildlife biologist
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Photo: A. Van Zoeren
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Hundreds of bird deaths sound alarm on problems in the Great Lakes 12:36 PM, October 18, 2012 Detroit Free Press October 18, 2012
Michigan’s oldest banded loon dies from avian botulism
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“I was not aware” “I was shocked”
“I was alarmed”
“the big worry”
“Woke up at 4:00 am thinking about this”
“Can anything be done to save the birds?”
“devastating results for common loons”
“Public outcry and interest”
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Overview
• Part I – A chronology of ecosystem change • Part II – Scientific and management response • Part III – Toward a new stewardship
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Scientific and Management Response: Beach monitoring
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Scientific and Management Response: Beach monitoring
Prediction for 2015 = 182 birds Total to date = 296 and climing
Prediction for 2014 = 57 birds Total to date = 110 birds
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Scientific and Management Response: Basic Research
• Benthic mapping (complete)
• Nearshore hydrodynamic modeling (in progress)
• Trophic structure
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Scientific and Management Response: Intensive Topical Research
• Nearshore histories • Food webs and trophic
pathways • Toxin distribution • Oxygen dynamics • Bird gut contents
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Scientific and Management Response: Nearshore Monitoring at Good Harbor
• Continuous water quality, currents, time lapse photos
• Periodic nutrients, seston, Cladophora, gobies, invertebrates
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Sloughed Cladophora mats
Scientific and Management Response: Oxygen Dynamics
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0102030405060
5 10 15 20 25
length (mm)
num
ber
0102030405060
5 10 15 20 25 30
length (mm)
num
ber
0102030405060
5 10 15 20 25
length (mm)
num
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Mussel length frequency analysis for three sample sites. Numbers in graphs represent goby abundance in grams per meter2 .
Sleeping Bear Shoals 17.7±5.4
Platte Bay Deep 0
Atwater Beach 5.1±2.8
Goby Size Classification by Gut Content Weight
0
5
10
15
20
25
30
35
40
45
small (n=9) medium (n=30) large (n=25)
wei
ght (
mg)
Mussel
Isopod
Amphipod
Chironomid
Large gobies eat a lot of mussels
Scientific and Management Response: Food Web Structure
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Scientific and Management Response: Food Web Dynamics
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Lake Michigan
Michigan
Wisconsin
Sleeping Bear Dunes National
Lakeshore
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Chunqi Shen and Qian Liao
Scientific and Management Response: Hydrodynamic / Cladophora Modeling
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Scientific and Management Response: Research Ripples
Shuchman et al.
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Overview
• Part I – A chronology of ecosystem change • Part II – Scientific and management response • Part III – Toward a new stewardship
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Toward a New Stewardship: Outreach and Interpretation
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Toward a New Stewardship: Citizen Science
• Helping NPS be responsive to changes – Government processes
are slow; citizens rise to the challenge quickly
– Funding is uncertain; citizens volunteer (often eagerly!) and nonprofits step in (thanks, NPCA!)
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Toward a New Stewardship: Citizen Science
• Helping NPS actively manage botulism outbreaks – Removing carcasses – Protecting wildlife from
disease transmission
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Toward a New Stewardship: Citizen Science
• Collecting valuable data – Bird carcasses; beach and
nearshore conditions – Integrated into broader
research efforts
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Toward a New Stewardship: Citizen Science
• Sharing their knowledge, experiences, enthusiasm – Enriching the broader
research effort – Connecting with local
tourists, community, media
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Lessons Learned
• We need to take the long view – To get perspective on our current predicament – To forge future monitoring/management strategies – To avoid problem of shifting baselines
• We need local capacity and partnerships – Local citizens are our eyes and ears – NPS staff can continue to serve as a conveners
• We’re excited to use Great Lakes parks as nearshore sentinels
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Acknowledgments
Citizen Scientists Universities and Nonprofits
USGS Science Centers Thanks, GLRI!
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North Manitou Island, SLBE, August 2004
“We have not yet seen that level on the mainland, but it is likely a matter of time...” - S. Yancho, Feb 2005
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“We were not looking to get on the map.” - K. Hyde, Oct 2006
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Scientific and Management Response
• SLBE’s Good Harbor as a natural laboratory: – Shuchman et al. Satellite-derived Cladophora maps. – Chun et al. 2013. Cladophora and C. botulinum. ES&T. – Dayton et al. 2014. Cladophora, mass transport, nearshore
phosphorus shunt. JGLR. – Turschak et al. 2014. Nearshore energy subsidies, fish and
invertebrates. Ecology. – Lepak et al. 2015. Cladophora-quagga mussels and
methylmercury production. ES&T. – Chun et al. 2015. Cladophora, C. botulinum,
management. Sci Total Environ. – Wijesinghe et al. 2015. C. botulinum variability. App
Environ Micro.
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Scientific and Management Response: Beach monitoring
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Scientific and Management Response: Beach monitoring
• During 3 years, peak detection occurred in
Oct; primarily migratory diving birds • In 2011, peak detection occurred in Aug;
primarily summer residents • Variety of species affected suggests
multiple routes for bird exposure to toxin
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Toward a New Stewardship: Local Partnerships