Download - Growth Rates
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Methylmercury Effects on Growth Rates of
Loggerhead Shrike Nestlings
Antelope Island, Great Salt Lake
Meg WolfDr. Christine Stracey
Westminster College, Salt Lake City
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Mercury Concentrations High Great Salt Lake Concentrations
Photo 1
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Bio magnification
Photo 2
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Methyl mercury Bio magnification Aquatic to Terrestrial Great Salt Lake onto Antelope Island
Photo 3,4,5
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Logger Head Shrikes Terrestrial Song Bird
Other studies • Parental behavior• feeding habits
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Loggerhead ShrikeHow does Methylmercury affect the growth rate of Loggerhead Shrike Nestlings?
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Methods M-W-F Field testing days Nest searching Weight Measurements
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Methods Continued Testing for Mercury Blood samples
Lab Analysis for Hg in ppm
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Photos6/27/14
6/30/14
Day 1
Day 3
Day 6
Day 8
Day 12
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Average growth rate
0 2 4 6 8 10 12 140
5
10
15
20
25
30
35
Age Days
Mas
s (g
ram
s)
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Growth rate Vs. Mercury 2013
0 2 4 6 8 10 12 1405
10152025303540
High>2.0 Medium>0.08 Low>0.0
HLMGrand Total
Age (Days)
Mas
s (g
)
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Growth rate Vs. Mercury 2014
0 2 4 6 8 10 12 14 1605
10152025303540
High>.20 Medium>.08 Low>.0
HLM(blank)Grand Total
Age (days)
Mas
s g
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ResultsThere is insufficient evidence to support that high Methyl Mercury concentrations in Loggerhead Shrikes affects growth rates.
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Discussion Close to endangerment More environmental pressures Species decline Behavioral changes
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AcknowledgmentsDr. Christine StraceyEnvironemntal Studies Department Field Research Crew:Viri, Marisol, Karina, Riley, Amber, Courtney, Josh The Great Salt Lake InsituteAntelope Island State Park
Westminster College
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SourcesPhoto: 1. Mercury in the air, water and biota at the Great Salt Lake (Utah, USA) Christianna Peterson, Mae Gustin⁎Department of Natural Resources and Environmental Science, University of Nevada, Reno, 2. http://deeakdev.files.wordpress.com/2012/05/science-biomag.jpg3. Loggerhead Shrike - Reche Canyon, CA © Tom Benson4. utahphotojournalism.com5. lakesaltknit.blogspot.com