Perry, Stephen

Fragmentation and Patch Size Shape Genetic Structure of Brook Trout Populations: We tested the relative influence of habitat patch size and connectivity on genetic structure and effective population size in eight brook trout (Salvelinus fontinalis) habitat patches in a watershed in Virginia, USA. Variation at eight microsatellite loci in 2229 young-of-the-year brook trout for two successive cohorts (2010 and 2011) was examined. Genetic differentiation across all populations was pronounced. Overall F'ST was 0.397 (95% CI: 0.322–0.525) and overall FST was 0.124 (95% CI: 0.096–0.159). Above-barrier patch size had a strong positive relationship with genetic diversity, Nˆ b, and genetic differentiation. Our analysis is consistent with greater extinction risk in smaller above-barrier patches. Larger above-barrier patches contained greater genetic diversity but reduced Nˆ b relative to adjacent below-barrier patches. The primary effect of barriers may be to reduce available above-barrier spawning habitat, even for larger above-barrier patches. Below-barrier patches also showed evidence of reduced genetic diversity and lack of connectivity. Genetic monitoring focused at gaining a broader understanding of the relationships here will be necessary to fully evaluate local extinction risks.
Located in Science and Data / Brook Trout Related Publications
Sensitivity and Vulnerability of Brook Trout Populations to Climate Change: Predicting future brook trout Salvelinus fontinalis distributions at the population scale under various climate scenarios is of interest to the Eastern Brook Trout Joint Venture. Previous larger scale models have been useful in highlighting the potential threat; however, the predicted air and water temperature errors associated with these models makes predictions of the persistence of individual brook trout populations problematic. We directly measured paired air and water temperatures in watersheds (N = 77) containing reproducing populations of brook trout in Virginia. We found that paired air and water temperature relationships are highly variable among patches but are a useful dataset to classify sensitivity and vulnerability of existing brook trout patches. We developed a classification system using sensitivity and vulnerability metrics that classified sampled brook trout habitats into four categories (High Sensitivity- High Vulnerability (51.9% ); High Sensitivity-Low Vulnerability (10.4 % ); Low Sensitivity-High Vulnerability (7.8 % ); Low Sensitivity-Low Vulnerability (29.9 % ). Our direct measurement approach identified potential refugia for brook trout at lower elevations and with higher air temperatures than previous larger scale modeling efforts. Our sensitivity and vulnerability groupings should be useful for managers making investment decisions in protecting and restoring brook trout.
Located in Science and Data / Brook Trout Related Publications
Ranking Site Vulnerability to Increasing Temperatures in Southern Appalachian Brook Trout Streams in Virginia: An Exposure - Sensitivity Approach: Climate change vulnerability classification model for brook trout populations; brook trout populations are classified into one of four quadrants based on direct measurements or model predictions of sensitivity and exposure. Low exposure, low sensitivity populations are most likely to persist under various climate change scenarios.
Located in Science and Data / Brook Trout Related Publications
USFWS Copyright Release Agreement: Requirement for the EBTJV/FWS-NFHAP project funding application package.
Located in Projects / EBTJV Funding Opportunities / 2024 Project Application Information
EBTJV Key Conservation Actions: This documents contains the EBTJV's current key conservation actions.
Located in Projects / … / 2024 Project Application Information / EBTJV Range-wide Habitat Goals, Objectives, and Key Conservation Actions
EBTJV Range-wide Habitat Goals and Objectives: This document contains the EBTJV's current range-wide habitat goals and objectives.
Located in Projects / … / 2024 Project Application Information / EBTJV Range-wide Habitat Goals, Objectives, and Key Conservation Actions
EBTJV Range-wide Habitat Goals, Objectives, and Key Conservation Actions: This folder contains documents that describe the EBTJV's current range-wide habitat goals and objectives, as well as its key conservation actions.
Located in Projects / EBTJV Funding Opportunities / 2024 Project Application Information
FY21 FWS-NFHAP Project Funding Application: The document is the application the EBTJV submitted to the US Fish and Wildlife Service for FY21 NFHAP funding considerations.
Located in Groups / … / Conference Calls / 2021 Steering Committee Conference Call Summaries
December 15, 2020 Steering Committee Meeting Summary: This document summarizes the business matters discussed during the Steering Committee meeting that occurred on December 15, 2020.
Located in Groups / … / Conference Calls / 2021 Steering Committee Conference Call Summaries
2021 Steering Committee Conference Call Summaries: This folder contains documents related to business items discussed by the EBTJV Steering Committee during their conference calls and in-person meetings.
Located in Groups / Steering Committee / Conference Calls

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