Erica Maltz, Fisheries Program Manager Drew Harper, Fish Biologist Burns Paiute Tribe 18 January 2012.

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Presentation transcript:

Erica Maltz, Fisheries Program Manager Drew Harper, Fish Biologist Burns Paiute Tribe 18 January 2012

Proposed Work Area

Problem Statement: Bull Trout What we’ve accomplished through … Timing and spatial extent of seasonal movement of migratory BUT Resident vs. fluvial Trends in adult abundance BT are a primary limiting factor to recovery From Perkins (2010).

Primary Limiting Factor: Brook trout dispersal, competition, hybridization† Lake Creek Highest occurrence (10:1) Dispersal from upstream seed source (atypical) Hybridization beyond F1/reciprocal backcrossing Pulse colonization Big Creek Typical dispersal Headwaters are “stronghold” for BUT Phenotypic characteristics  good indicator of genetic identity † Paul and Post (2001), Gunckel et al. (2002), DeHaan et al. (2009). * Taken from an ORAFS presentation by Chad Abel (Feb. 25, 2010), “Upper Malheur Brook Trout Suppression Plan.” *

Objectives Test the efficacy of mechanical methods to suppress brook trout populations in Lake and Big Creeks  concurrent to additional BPT projects Facilitate coordination between co-management agencies to develop a strategic brook trout management plan (Phase II)  BPA $$ to attract restoration/recovery activities Produce annual assessment of bull trout adult abundance in regards to demographic target recovery criteria Provide statistically rigorous annual redband trout abundance estimates to guide management

Study Design: Redband Trout Abundance and Distribution Target total 108 sites/5yr No fixed panel No overdraw Refine distribution crews for target of 100 sites (50/each strata/year) GRTS design rotating panel 34% target (estimated) precision across two strata High σ 2 + Low N

Study Design: BT Suppression Lake Creek Estimate abundance GRTS design, extrapolate to sample frame 30 sites (30%), multiple pass depletion 10% of sites are calibration (mark- recapture)  continuous removal Impede BT emigration/active removal Weir (June-Nov.) Spatially coincides with thermal barrier to fluvial BUT Monitor native species response Δ Abundances, site densities, and condition factor 23 sites below waterfall (barrier) BUT/RBT Compensatory response Δ Length at age/maturity Relatedness of BT

Study Design: BT Suppression Native species response Continuous snorkel surveys Δ relative abundance over 5 years Impede brook trout expansion Test efficacy of using barrier Test location permanent barrier Can impact relative abundances above? Are BT moving upstream? Big Creek

LAKE CRK: E-fishing abundance Weir BIG CRK: Weir continuous snorkel surveys 2013 LAKE CRK: Continuous e- fishing removal/weir BIG CRK: weir operation above known BT distribution LAKE CRK: repeat 2013 to test efficacy of mechanical removal BIG CRK: repeat 2013 to test efficacy of utilizing barriers 2017 Reduce spawner recruitment from seed source Response of native species/BT to electrofishing removal regime/barriers Cooperative basinwide suppression plan utilizing both preliminary and final results Phase II (co-management decisions): Permanent barriers? Mechanical removal of isolated patches? Use of piscicides? Phase I actions Phase II actions 2018-

Relationship of proposal to other projects Primary limiting factor: brook trout (hybridization/competition) USFWS Recovery Plan: Malheur Recovery Unit USBR: qPCR as an effectiveness monitoring tool USBR: Seed source removal at High Lake Proposed Redband trout status and trend monitoring Malheur River Subbasin Assessment and Management Plan USFWS: WNTI Status Assessments Proposed Bull trout status and trend monitoring Interagency: Spawning surveys Key uncertainties: redband abundance over two ecological distinct strata Proposed Threats-based targets ODFW/FS/ USFWS: Suppression/ restoration

Implications of results to F&W management Redband abundance estimates over two ecologically distinct strata, estimated/target precision of 34% Identify key management areas Trend detection Evaluation of efficacy of mechanical suppression Evaluate success of minimally invasive techniques Identify Phase II in BT suppression if chemical treatment/permanent barriers are needed and where (2018-) Address immediate limiting factors to recovery (USFWS Recovery Plan/Subbasin Plan) Produce/share results, applicable statewide Attract changes in FS management of sensitive areas

Adaptive Management Identified limiting factors through , shifting current focus to mitigating limiting factors If mechanical methods are insufficient  utilize information gained to develop alternatives cooperatively Adapt to suppression techniques as they become available Develop/ incorporate new tools to monitor Δ in species abundance

Conclusions Taking what we’ve learned through and utilizing to develop an action-oriented project Recovery Plan updates necessitate immediate action/identifies BT as primary limiting factor Guide development of alternative treatment options, if needed Utilizing regional/local expertise to develop all portions of proposal Coincides with BOR project to disrupt/eliminate downstream dispersal and recruitment

Literature Cited Bangs, B., S. Gunckel, and S. Jacobs distribution and abundance of redband trout, Oncorhynchus mykiss, in the Malheur River Basin. In Evaluate the Life History of Native Salmonids in the Malheur River Subbasin. Burns Paiute Tribe Annual Report FY2007. Prepared for Bonneville Power Administration. Gunckel, S., A. Hemmingsen, and J. Li Effect of bull trout and brook trout interactions on foraging, habitat, feeding, and growth. Trans. Amer. Fish. Soc. 131: DeHaan, P., L. Schwabe, and W. Arden Spatial patterns of hybridization between bull trout, Salvelinus confluentus, and brook trout, Salvelinus fontinalis, in an Oregon stream network. Cons. Gen. 11(3): Miller, S., S. Jacobs, S. Gunckel, and S. Richardson Evaluation of a sampling approach to monitor the status of Great Basin redband trout in Southeastern Oregon. Oregon Department of Fish and Wildlife, Corvallis, OR. Paul, A. and J. Post Spatial distribution of native and nonnative salmonids in streams of the eastern slopes of the Canadian Rocky Mountains. Trans. Amer. Fish. Soc. 130: Perkins, R Annual bull trout spawning survey report. In Evaluate the Life History of Native Salmonids in the Malheur River Subbasin. Burns Paiute Tribe Annual Report FY2010. Prepared for Bonneville Power Administration. Stevens, D. Jr., and A. Olsen Variance estimation for spatially balanced sampling of natural resources. Envirometrics. 14: Stevens, D. Jr., and A. Olsen Spatially balanced sampling of natural resources. J. Amer. Stat. Assoc. 99(465):