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:
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
What is Didymo? Image: Sarah Kiemle, Michigan Tech University Other diatom species; growing attached to stalk Didymo stalk Didymo cells
Blooms of Rock Snot? Map: Sarah Spaulding, USGS
Questions (1)Does D. geminata alter the composition and abundance of stream invertebrates? (2) Does D. geminata affect the growth rate of stream invertebrates?
Removal Plots Upstream Downstream D D D D D D D D
I’m good at removing didymo!
Three invertebrate species showed habitat selection E. longimanus Chironomidae Hesperoperla pacifica
Didymo has no effect on species richness
Two Experiments in the East River: Growth Chambers Baetis spp N = 6 chambers/treatment Epeorus longimanus N = 9 chambers/treatment
Epeorus longimanus shows a trend towards slower growth rate in Didymo
Didymo has no effect on the growth rate of Baetis spp
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
Acknowledgements Brad W. Taylor The “Benthettes” The National Science Foundation Rocky Mountain Biological Laboratory