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Clancy Brown William Smith College Rocky Mountain Biological Lab Mentor: Brad W. Taylor Effect of the nuisance diatom Didymosphenia geminata on invertebrates.

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Presentation on theme: "Clancy Brown William Smith College Rocky Mountain Biological Lab Mentor: Brad W. Taylor Effect of the nuisance diatom Didymosphenia geminata on invertebrates."— Presentation transcript:

1 Clancy Brown William Smith College Rocky Mountain Biological Lab Mentor: Brad W. Taylor Effect of the nuisance diatom Didymosphenia geminata on invertebrates in the East River

2 What is Didymo? Image: Sarah Kiemle, Michigan Tech University Other diatom species; growing attached to stalk Didymo stalk Didymo cells

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4 Blooms of Rock Snot? Map: Sarah Spaulding, USGS

5 Questions (1)Does D. geminata alter the composition and abundance of stream invertebrates? (2) Does D. geminata affect the growth rate of stream invertebrates?

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7 Removal Plots Upstream Downstream D D D D D D D D

8 I’m good at removing didymo!

9 Three invertebrate species showed habitat selection E. longimanus Chironomidae Hesperoperla pacifica

10 Didymo has no effect on species richness

11 Two Experiments in the East River: Growth Chambers Baetis spp N = 6 chambers/treatment Epeorus longimanus N = 9 chambers/treatment

12 Epeorus longimanus shows a trend towards slower growth rate in Didymo

13 Didymo has no effect on the growth rate of Baetis spp

14 Summary: Effect of D. geminata on stream invertebrates (1)Composition and abundance -More Chironomidae and stoneflies (Hesperoperla), but fewer E. longimanus in D. geminata treatment -No difference in species richness (2)Growth rate -A trend for slower growth in E. longimanus -No significant effect on Baetis spp

15 Acknowledgements Brad W. Taylor The “Benthettes” The National Science Foundation Rocky Mountain Biological Laboratory


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