Flowering Rush An Invasive Aquatic Macrophyte Infesting the Columbia River Basin
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1 Flowering Rush An Invasive Aquatic Macrophyte Infesting the Columbia River Basin Peter Rice, University of Montana, Virgil Dupuis, Salish Kootenai i College
2 Flowering Rush (Butomus umbellatus) umbel shaped cluster of ~30 flowers 3 whitish pink petals & 3 similar sepals green leaves are triangular in cross section leaf tips may be spirally twisted strongly rhizomatous
3
4 Flowering Rush ( (Butomus umbellatus) East Bay Flathead Lake MT
5
6 North American Invasion circa St. Lawrence River region 1949 Snake River Idaho (Idaho Falls) 1964 Flathead Lake (north shore) Infested Counties in WA, OR, ID, MT, WY
7 Fully Submerged Form Emergent Form Shoreline Form
8 Four Forms of Dispersal 1. seeds 2. vegetative bulblets inflorescence 3. vegetative bulblets side of rhizomes 4. rhizome fragments
9
10 Diploid self-compatible prolific flowering high seed production prolific bulblet production (rhizome & inflorescence) partial dispersal by vegetative means Triploid self-sterile sterile within clones infrequent flowering low production of sterile seeds inflorescence bulblet production not evident disperses only by rhizome fragmentation
11 Buoyant Rhizome Fragments
12 Rhizome Fragments on Unvegetated Littoral Zone Sediments
13 Invasives of Wetlands & Shoreline (Displacing Native Plants)
14 Infesting Previously Unvegetated Littoral Zones
15 Shoots Emerging in Late March/Early April
16 Kerr Dam Induced Low Pool in Spring Favors Flowering Rush Over Native Macrophytes
17 Larger Infestations Partial Survey Data Through 10/13/2008
18 Robust Triploid Dispersing Out of Flathead Basin Lateral Rhizome Bud
19 Kerr Dam Spillway from Flathead Lake to River
20 American Falls
21 Dispersal Down the Columbia River System Kerr Dam into Flathead and Clark Fork Rivers (MT) Thompson Falls, Noxon,, Cabinet Reservoirs (MT) Lake Pend Oreille Clark Fork River delta (ID) Snake River Aberdeen-Springfield Canal Irrigation Systems (ID)
22 Flathead River Below Kerr Dam
23 American Falls
24 Aberdeen-Springfield Canal System (Spills to Snake River at American Falls ID)
25 Aberdeen-Springfield Canal System (Spills to Snake River at American Falls ID)
26 Aberdeen-Springfield Canal System (Spills to Snake River at American Falls ID)
27 Aberdeen-Springfield Canal System (Spills to Snake River at American Falls ID)
28 Aberdeen-Springfield Canal System (Spills to Snake River at American Falls ID)
29 Pablo Reservoir Irrigation Lift Station Flathead Lake/River Flowering Rush Colony
30 Flathead Valley Pablo Reservoir Irrigation Canal
31 Private Boat Docks Surrounded by Flowering Rush
32 Swimmer s s Itch ( (schistosome cercarial dermatitis) Trematode Parasite ( (Trichobilharzia Great Pond Snail ( (Lymnaea stagnalis) Trichobilharzia ocellata)
33 Obvious Negative Impacts Displacement of Native Plant Communities Formation of Monotypic Vegetation Loss of Open Water Recreation Irrigation Impediment Higher Level Impacts Have Not Been Assessed Increases in Water Temperatures Sediment Transport & Deposition Food Chain Alterations / Native Fisheries
34 Mouth of Dayton Creek Historic Spawning Habitat For Adfluvial Cutthroats & Bull Trout
35 Black Bullhead Yellow Perch Schultz 2006
36 One Cautionary Hypothesis Native Bull Trout Native Cutthroat Introduced Lake Trout Introduced Yellow Perch Yellow Perch Eggs on Vegetation
37 Early Detection Rapid Response Opportunity Flathead Lake ~2,000 ac Flathead Lake 18.5% FoO Thompson F. 2.3% FoO Noxon <1% (Present) Cabinet 0.1% L. Pend Oreille (~8 acres) L. Pend Oreille Preliminary Data from: Rice & Dupuis Madsen & Cheshier 2008 Woolf 2007, Madsen & Wersal 2008
38 Flowering rush Eurasian watermilfoil
39 Current Project Objectives Salish Kootenai College, Salish & Kootenai Tribes, University of Montana Mapping Flathead Lake Spatial model to predict spread and inform management decisions (Flathead Lake) Phenology in relation to management options Foliar applied herbicide and hand digging trials Karyotyping various CRB infestations Informing Columbia River system managers of threat
40 Need for A System-Wide / Multi-Partner Comprehensive Scientific Assessment Main Stem Survey Water Level Management & Invasion Success Reproductive Phenology & Rhizome/Seed Dispersal Higher Trophic Level Impacts Sediment Deposition & Transport Control Methods Professional Awareness Strategic Plan for Columbia River Basin
41 Questions & Comments? Peter Rice (406) Photos by Alvin Mitchell & Dave Boldt SKC, Sue Ball CSKT, Peter Rice UM, Chris Eckert Queens University
3 whitish pink petals & 3 similar sepals green leaves are triangular in cross section. leaf tips may be spirally twisted
Flowering Rush An Invasive Aquatic Macrophyte Infesting the Columbia River Basin Peter Rice, University of Montana, Virgil Dupuis & Alvin Mitchell, Salish Kootenai College Flowering Rush (Butomus umbellatus)
Flowering Rush An Invasive Aquatic Macrophyte Infesting the Columbia River Basin
Flowering Rush An Invasive Aquatic Macrophyte Infesting the Columbia River Basin Virgil Dupuis Salish Kootenai College Peter Rice University of Montana Pacific Northwest Distribution Montana Distribution
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