EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021

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5/21/2019 | 3:00 PM - 3:15 PM | PRIORITIZATION OF MANAGEMENT ACTIONS FOR A THREATENED TROUT USING MULTIPLE POPULATION VIABILITY ANALYSIS | 150 DEF

PRIORITIZATION OF MANAGEMENT ACTIONS FOR A THREATENED TROUT USING MULTIPLE POPULATION VIABILITY ANALYSIS

Managers of at-risk species frequently need to prioritize actions based on questions such as “Which populations are most at-risk of extirpation?”, “Which would benefit most from management?” or “Where could we reintroduce viable populations?”, but limitations of traditional modeling approaches often hamper empirical guidance — especially for species comprising many isolated populations across broad geographies. The federally-listed Lahontan cutthroat trout (LCT) is one such species, for which there has been little quantitative foundation to guide range-wide management and recovery. We employed a recently-developed Multiple Population Viability Analysis model (MPVA), customized for LCT using all count data from backpack electrofishing surveys (1985-2015) and a suite of environmental and biological covariates, to address priority questions identified with management partners. Across 211 streams where LCT populations currently exist or may be reintroduced, we: 1) ranked extinction risk for current populations range-wide, 2) quantified the benefit of removing non-native trout and 3) estimated viability for LCT reintroduced to unoccupied waters using different protocols. Due to effective collaboration among academic, non-profit, state and federal entities, and development of a decision support tool, data-driven results are being incorporated directly into LCT management prioritization and recovery planning.

Modeling
Monitoring
Remote Sensing

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Presenters/Authors

Helen Neville (), Trout Unlimited, hneville@tu.org;