Effects of river otters on benthic macroinvertebrate populations - - PowerPoint PPT Presentation
1 Effects of river otters on benthic macroinvertebrate populations of the Colorado Rocky Mountains Amanda J. Tetz Department of Biology Metropolitan State University of Denver Photo by Victoria Alexander on Unsplash 2 North American
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Amanda J. Tetz Department of Biology Metropolitan State University of Denver
Photo by Victoria Alexander on Unsplash
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arly 19 19th
th century
century: first first rec record
ter ob
serv rvation ation in in th the st state ate
Found und in in ev every ery ma major jor wate watershed rshed
the st state ate of
Colo lora rado do
Photo by David Groves on Unsplash
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nadensis populations pulations declined lined in in th the 19 19th
th & 20
20th
th centuries
turies…
Mini ning ng
Agric icult ulture ure
Fur Tr Trap appin ping
[Coryell Coal Mine - Newcastle, Garfield County CO], Retrieved from http://www.miningartifacts.org/Colorado-Mines.html
State tate End ndan ange gere red d in in 197 1975
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Ov Over er 100 100 ot
ters rs re rele leas ased ed at at fi five ve si site tes ac acro ross ss th the st state ate be betw twee een 1976 1976-1991 1991
https://cpw.state.co.us/Documents/WildlifeSpecies/SpeciesOfConcern/RecoveryPlans/CDOW2003Riverotterrecoveryplan.pdf
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Trophic effects caused by wolves in Yellowstone include: Elk pop’n Aspen & Cottonwood recruitment Beaver & Bison pop’ns
Wolves of Yellowstone
Frank, J.W. (n.d). [Wolf portrait taken from a vehicle in a pullout]. Retrieved from https://www.nps.gov/media/photo/gallery-item.htm?pg=0&id=cebbfa91-94e3-4e62-bf1d-1dca050c5d5f&gid=25C97BD8- 155D-451F-675E208BE082FE26
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Reestablishment of otter populations… fish populations macroinvertebrate populations
[BugsinDish] Retrieved from https://dep.wv.gov/WWE/watershed/bio_fish/Pages/Bio_Fish.aspx
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Five sites selected along 29.7 km stretches
Two river-bottom samples collected at each site
Photo credit: Brad Samuels
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In Inta tact ct ma macr croi
nvertebra rtebrates tes fr from
each ch ri rive ver r sa samp mple le we were re counted…
x̄count = 132.6 SDcount = 62.5 x̄temp = 8.1 °C Sdtemp = 0.2 °C x̄count = 100.2 SDcount = 55.3 x̄temp = 8.3 °C SDtemp = 0.7 °C Factor p River 0.249 Temp 0.476 River:Temp 0.461
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[Finalist_Fryingpan-River-East-of-Basalt]. Retrieved from: https://coloradowatertrust.org/project/wheeler-ditch Photo credit: Brad Samuels
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Greb, P. (n.d). [entomopathogenic nematode (Heterorhabditis bacteriophora)]. Retrieved from: https://www.forestryimages.org/browse/detail.cfm?imgnum=1316021
12 [w631933162]. Retrieved from: https://columbiametro.com/article/utterly-otters/
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Sincerest thanks to…
his support, assistance with sample collection, photography, and co- parenting during this project!
[River-Otter]. Retrieved from: https://hhltmaine.org/nature-notes/nature-notes-river-otters/
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Adams B.J., Nguyen K.B. (2008). Nematode Parasites of Insects. In: Capinera J.L. (eds) Encyclopedia of Entomology. Springer, Dordrecht Armstrong D. M. (1972). Distribution of mammals in Colorado. (Vol. 3). U of KA Printing Service. Berg, J. K. (1999). Final Report of the River Otter Research Project on the Upper Colorado River Basin in and Adjacent to Rocky Mountain National Park, Colorado. Colorado Division of Wildlife. (2003). State of Colorado River Otter Recovery Plan (Issue June). https://cpw.state.co.us/Documents/WildlifeSpecies/SpeciesOfConcern/RecoveryPlans/CDOW2003Riverotterrecoveryplan.pdf Ripple, W. J., & Beschta, R. L. (2012). Trophic cascades in Yellowstone: The first 15 years after wolf reintroduction. Biological Conservation, 145, 205–213.