Field Trip Report Caddisfly outbreak on the Colorado River below Davis Dam Laughlin NV / Bullhead City AZ
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1 Field Trip Report Caddisfly outbreak on the Colorado River below Davis Dam Laughlin NV / Bullhead City AZ June 25-26, 2018 TWG Meeting Phoenix, AZ Craig Ellsworth, WAPA Larry Stevens, MNA Subject, Office or event
2 Caddisfly infestation below Davis Dam 1938: Completion of Parker Dam 1951: Completion of Davis Dam 1986: Blackfly suppression program below Davis Dam 1988: Caddis an issue below Parker Dam : Caddisfly Abatement Study below Parker Dam 2007: Introduction of quagga 2009: Koi herpes virus kills carp in Lake Mohave 2010: Increase in caddis below Davis Dam 2013: Reduction in trout stocking Other things to consider: Changes in nutrients (effluent), particulates, substrate stabilization, water temperature Smith, R.L., 2005, Colorado River caddisfly bionomics and abatement report, University of Arizona. Problem caddis: Netspinning caddisfly, Smicridea fasciatella Individual light trap sample weighing 13 lbs (ca. 3.5 million individuals) 2
3 Background No EPT below Glen Canyon Dam* Hypotheses: Hydropower fluctuations extirpate aquatic insects Hydropeaking reduces % EPT but Caddisflies are at nuisance levels below Davis Dam where: daily flow fluctuations are 3x that of Glen Canyon and are out of sync with evening egg laying Oviposition study: Not all EPT are edge egg layers 3
4 Field trip: Laughlin, NV May 3-4, 2018 Participants: Argonne: Kirk and John WAPA: Craig and Shane GCMRC: Ted and Jeff USU Buglab: Scott Miller MNA: Larry Stevens SNWA: Peggy Roefer Bullhead City Pest Abatement: Joe Iburg 4
5 Field trip: Laughlin, NV Boat trip Drift Benthics Light trap Discussions at Mohave Community College Field trip report 5
6 EPT found in the mainstem below Davis Dam Netspinning caddis: Hydropsychidae Smicridea fasciatella Netspinning caddis #2: Hydropsychidae Smicridea utico Purse-case or microcaddis: Hydroptilidae Stactiobiella Long-horned caddis: Leptoceridae Nectopsyche diarina Mayfly: Baetidae Dragonfly: Gomphidae Erpetogomphus Hydroptilids Leptocerids 6
7 Netspinning Caddisfly Hydropsychidae, Smicridea fasciatella BIOLOGY This is a common and often abundant species in the southwestern United States and northern Mexico. The immature stages are found on rocks and sticks, generally in riffle areas, in flowing water of from a meter to meters in width. The larvae construct a typically hydropsychid retreat and net extending into the current. The pupae are generally found in a more protected site enclosed in a shelter of sand and/or organic matter rather solidly held together by silk. The adults are taken at light, often abundantly, at night. OLIVER S. FLINT, JR. Studies of Neotropical Caddisflies, XVII: The Genus Smicridea from North and Central America (Trichoptera: Hydropsychidae), SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY NUMBER 167 7
8 Oviposition study: USU/GCMRC Two caddisflies Hydropsyche occidentalis Brachycentrus occidentalis Mayfly (Baetis spp.) Midge (Eukiefferiella spp.) Fluctuating flows could affect edge specialists Egg desiccation and mortality Reduces emergent substrates for egg laying but not all EPT are edge specialists 8
9 Why is Smicridea fasciatella so prevalent below Davis Dam but not below Glen Canyon Dam? Flow fluctuations Seasonality Daily Substrate Embeddedness Emergent/floating Woody debris Cladophora/chara Water quality Anoxic substrates Temperature Isolation Nutrients Competition/Predation Davis Dam Current reservoir elevation: 643 Penstock elevation: 570 (73 ) Glen Canyon Dam Current reservoir elevation: 3,612 Penstock elevation: 3,490 (122 ) 9
10 Blinn and Ruiter (2009) caught Smicridea at Lees Ferry Smicridea fasciatella at Lees Ferry (rkm 0) and at rkm 15 on the Colorado River In the Paria? Typo? Are you getting treatment for that? 10
11 Smicridea fasciatella in the Colorado River basin Global Biodiversity Information Facility (GBIF.org) Parker/Davis Las Vegas Wash 2 records in Grand Canyon (Pipe Creek) Cataract San Juan Deso/Grey Smicridea McLachlan,
12 Question? If Smicridea fasciatella is or ever was in Glen Canyon......and if it is a deep-water specialist like Hydropsyche occidentalis and can handle high daily stage fluctuations......then why is it, or any other deep-water specialist EPT, not more prevelant below Glen Canyon Dam? 12
13 Why are deep-water specialist EPT so prevalent below Davis Dam but not below Glen Canyon Dam? Flow fluctuations Seasonality Daily Substrate Embeddedness Emergent/shallow Woody debris Cladophora/chara Water quality Anoxic substrates Temperature Isolation Nutrients Competition/Predation Davis Dam 6.5 feet change 4,400 27,000 cfs Low water: early morning Glen Canyon Dam 1.5 feet change 9,000 17,000 cfs Low water: early morning 13
14 Why are deep-water specialist EPT so prevalent below Davis Dam but not below Glen Canyon Dam? Flow fluctuations Seasonality Daily Substrate Embeddedness Emergent/shallow Woody debris Cladophora/chara Water quality Anoxic substrates Temperature Isolation Nutrients Competition/Predation 4,400 cfs Early morning Emergent substrates 27,000 cfs Afternoon to midnight 14
15 Subject, Office or event 15 June 2018 TWG Meeting, Phoenix, AZ
16 Why are deep-water specialist EPT so prevalent below Davis Dam but not below Glen Canyon Dam? Flow fluctuations Seasonality Daily Substrate Embeddedness Emergent/shallow Woody debris Cladophora/chara Water quality Anoxic substrates Temperature Isolation Nutrients Competition/Predation Toxic to sensitive EPT Only tolerant species present Ubiquitous below Glen Canyon Dam to the Paria inflow 16
17 Why are deep-water specialist EPT so prevalent below Davis Dam but not below Glen Canyon Dam? Flow fluctuations Seasonality Daily Substrate Embeddedness Emergent/shallow Woody debris Cladophora/chara Water quality Anoxic substrates Temperature Isolation Nutrients Competition/Predation 17
18 Why are deep-water specialist EPT so prevalent below Davis Dam but not below Glen Canyon Dam? Flow fluctuations Seasonality Daily Substrate Embeddedness Emergent/shallow Woody debris Cladophora/chara Water quality Anoxic substrates Temperature Isolation Nutrients Competition/Predation 18
19 What does this mean? If there is a primary stressor or a combination of stressors that is limiting EPT below Glen Canyon Dam It is affecting deep-water specialists as well as edge specialists Deep-water specialists can be very successful in a hydropower tailwater This would indicate that daily fluctuations, egg desiccation, and lack of emergent substrates are not the limiting bottlenecks for EPT below Glen Canyon Dam. 19
20 Next steps Finish Bugflows Start thinking about what other experimentation we want to do after Bugflows Substrate manipulations Embeddedness Hyporheic anoxia Woody debris / emergent substrates Nutrient supplementation Change timing of HFEs 20
21 Pre-order t-shirts now Subject, Office or event 21 June 2018 TWG Meeting, Phoenix, AZ
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