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Effect of the nuisance diatom Didymosphenia geminata on invertebrates in the East River

Effect of the nuisance diatom Didymosphenia geminata on invertebrates in the East River. Clancy Brown William Smith College Rocky Mountain Biological Lab Mentor: Brad W. Taylor. What is Didymo?. Other diatom species; growing attached to stalk. Didymo cells. Didymo stalk.

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Effect of the nuisance diatom Didymosphenia geminata on invertebrates in the East River

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

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

  3. Blooms of Rock Snot? Map: Sarah Spaulding, USGS

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

  5. Upstream D 8 7 D Removal Plots 6 D 5 D 4 D 3 D 2 D 1 D Downstream

  6. I’m good at removing didymo!

  7. Three invertebrate species showed habitat selection Chironomidae E. longimanus Hesperoperlapacifica

  8. Didymo has no effect on species richness

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

  10. Epeorus longimanus shows a trend towards slower growth rate in Didymo

  11. Didymo has no effect on the growth rate of Baetis spp

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

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

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