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A presentation of coldwater fisheries and climate adaptation case studies in the Eastern and Western United States.
Located in The Story of Wild Brook Trout / Brook Trout Video and Webinar Gallery
File 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 / Brook Trout Genetics Research
File 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
FY14 EBTJV Coordination and Operations_FWS-NFHAP Funded Agreement
This folder contains documents related to the EBTJV's FY14 Coordination and Operations agreement supported by FWS-NFHAP Funds.
Located in Projects / EBTJV Operational Grants
FY15 EBTJV Coordination and Operations_FWS-NFHAP Funded Agreement
This folder contains documents related to the EBTJV's FY15 Coordination and Operations agreement supported by FWS-NFHAP Funds.
Located in Projects / EBTJV Operational Grants
File FY15 Scope of Work
This document describes the EBTJV Coordinator's scope of work supported by FY15 FWS-NFHAP funds.
Located in About EBTJV / EBTJV Management / EBTJV Coordinator - Scope of Work Descriptions
FY16 EBTJV Coordination and Operations_FWS-NFHAP Funded Agreement
This folder contains documents related to the EBTJV's FY16 Coordination and Operations agreement supported by FWS-NFHAP Funds.
Located in Projects / EBTJV Operational Grants
File FY16 Scope of Work
This document describes the EBTJV Coordinator's scope of worked supported by FY16 FWS-NFHAP funding.
Located in About EBTJV / EBTJV Management / EBTJV Coordinator - Scope of Work Descriptions
FY17 EBTJV Coordination and Operations_FWS-NFHAP Funded Agreement
This folder contains documents related to the EBTJV's FY17 Coordination and Operations agreement supported by FWS-NFHAP Funds.
Located in Projects / EBTJV Operational Grants
File FY17 Scope of Work
This document describes the EBTJV Coordinator's scope of work supported by FY17 FWS-NFHAP funds.
Located in About EBTJV / EBTJV Management / EBTJV Coordinator - Scope of Work Descriptions