clancy brown william smith college rocky mountain biological lab mentor: brad w. taylor effect of...
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![Page 1: Clancy Brown William Smith College Rocky Mountain Biological Lab Mentor: Brad W. Taylor Effect of the nuisance diatom Didymosphenia geminata on invertebrates](https://reader036.vdocuments.us/reader036/viewer/2022062806/56649cab5503460f9496c5e3/html5/thumbnails/1.jpg)
Clancy BrownClancy Brown
William Smith CollegeWilliam Smith College
Rocky Mountain Biological LabRocky Mountain Biological Lab
Mentor: Brad W. TaylorMentor: Brad W. Taylor
Effect of the nuisance diatom Effect of the nuisance diatom Didymosphenia geminataDidymosphenia geminata
on invertebrates on invertebrates in the East Riverin the East River
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What is Didymo?What is Didymo?
Image: Sarah Kiemle, Michigan Tech University
Other diatom species; growing attached to stalk
Didymo stalk
Didymo cells
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Blooms of Rock Snot?Blooms of Rock Snot?
Map: Sarah Spaulding, USGS
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QuestionsQuestions
(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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Removal PlotsRemoval PlotsUpstream
Downstream
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1 D
D
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I’m good at removing didymo!I’m good at removing didymo!
18-Jun 25-Jun 02-Jul 09-Jul 16-Jul 23-Jul 30-Jul
D.
gem
inat
a vo
lum
e in
dex
0
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Removal
D. geminata
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D. geminata
Present Removed
Log[
dens
ity (
inse
cts/
m2 )
]
0
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Three invertebrate species showed Three invertebrate species showed habitat selectionhabitat selection
E. longimanusE. longimanus
ChironomidaeChironomidae
HesperoperlaHesperoperlapacificapacifica
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Didymo has no effect on species Didymo has no effect on species richnessrichness
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Two Experiments in the East River:Two Experiments in the East River:
Growth ChambersGrowth Chambers Baetis spp N = 6 chambers/treatment
Epeorus longimanus N = 9 chambers/treatment
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Epeorus longimanusEpeorus longimanus shows a trend shows a trend towards slower growth rate in Didymotowards slower growth rate in Didymo
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Didymo has no effect on the growth rate Didymo has no effect on the growth rate of of Baetis sppBaetis spp
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Summary: Effect of Summary: Effect of D. geminataD. geminata on stream invertebrateson 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
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AcknowledgementsAcknowledgements
Brad W. TaylorBrad W. Taylor
The “Benthettes”The “Benthettes”
The National Science FoundationThe National Science Foundation
Rocky Mountain Biological LaboratoryRocky Mountain Biological Laboratory