Perry, Stephen

TU Eastern Brook Trout Conservation Portfolio, Range-wide Assessment and Focal Area Tools: Trout Unlimited developed three conservation planning products to help identify strategic conservation opportunities and evaluate potential projects within the range of Eastern Brook Trout (EBT) in the eastern US.
Located in Science and Data / Data and Brook Trout Decision Support Tools
Understanding environmental DNA detection probabilities: A case study using a stream-dwelling char Salvelinus fontinalis: Environmental DNA sampling (eDNA) has emerged as a powerful tool for detecting aquatic animals. Previous research suggests that eDNA methods are substantially more sensitive than traditional sampling. However, the factors influencing eDNA detection and the resulting sampling costs are still not well understood. Here we use multiple experiments to derive independent estimates of eDNA production rates and downstream persistence from brook trout (Salvelinus fontinalis) in streams. We use these estimates to parameterize models comparing the false negative detection rates of eDNA sampling and traditional backpack electrofishing. We find that using the protocols in this study eDNA had reasonable detection probabilities at extremely low animal densities (e.g., probability of detection 0.18 at densities of one fish per stream kilometer) and very high detection probabilities at population-level densities (e.g., probability of detection N0.99 at densities of ≥3 fish per 100 m). This is substantially more sensitive than traditional electrofishing for determining the presence of brook trout and may translate into important cost savings when animals are rare. Our findings are consistent with a growing body of literature showing that eDNA sampling is a powerful tool for the detection of aquatic species, particularly those that are rare and difficult to sample using traditional methods.
Located in Science and Data / Brook Trout Related Publications
Upper Shavers Fork Instream and Riparian Habitat Restoration: Project application
Located in Projects / … / 2015 Projects / Upper Shavers Fork Instream and Riparian Habitat Restoration, Randolph County, WV
Upper South Branch/Thorn Creek Brook Trout Patch Restoration and Monitoring, Cave, WV: This project will restore habitat to a degraded three mile section of Thorn Creek in support of strengthening the Thorn Creek Brook Trout Patch, and expand that patch into the South Branch of the Potomac. The project cost is $270,250 and the estimated socioeconomic benefit is $1.6 million.
Located in Projects / 2006 - 2018 Projects / 2018 Projects
Upper South Branch/Thorn Creek Brook Trout Patch Restoration and Monitoring, Cave, WV: Project application
Located in Projects / … / 2018 Projects / Upper South Branch/Thorn Creek Brook Trout Patch Restoration and Monitoring, Cave, WV
USFWS Copyright Release Agreement: Requirement for the EBTJV/FWS-NFHAP project funding application package.
Located in Projects / EBTJV Funding Opportunities / 2025 Project Application Information
USFWS Copyright Release Agreement: Requirement for the EBTJV/FWS-NFHAP project funding application package.
Located in Projects / EBTJV Funding Opportunities / 2024 Project Application Information
USFWS Copyright Release Agreement: Requirement for the EBTJV/FWS-NFHAP project funding application package.
Located in Projects / EBTJV Funding Opportunities / 2023 Project Application Information
What predicts the use by brook trout (Salvelinus fontinalis) of terrestrial invertebrate subsidies in headwater streams?: 1. Spatial subsidies are important resources for organisms in receiving habitats, particularly when production in those habitats is low. Terrestrial invertebrates provide a critical subsidy for trout, including eastern brook trout (Salvelinus fontinalis), but we have limited understanding of what causes input and use of these subsidies to vary among streams. 2. We predicted that forest successional stage would be an especially important driver of variation in terrestrial invertebrate subsidies to brook trout in headwater streams due to differences in terrestrial invertebrate biomass in early and late successional habitats. Specifically, we expected biomass of aerial invertebrates, those capable of dispersal to the stream, to be greater in early successional habitat than late successional habitat due to the nutrient-rich, herbaceous vegetation typical of early successional habitat. 3. We measured aerial terrestrial invertebrate biomass in early and late successional habitats, input to streams and use by resident brook trout in 12 first- and second-order catchments in northern New Hampshire, U.S.A. The study catchments represented a range of early successional habitat coverage (0–51.5%). We also measured a suite of reach-scale variables that might influence terrestrial invertebrate input and use by brook trout, including riparian forest conditions and benthic invertebrate biomass. 4. Within study catchments, aerial terrestrial invertebrate biomass and abundance were significantly higher in early successional habitats than late successional habitats. However, terrestrial invertebrate input to streams and use by brook trout were unrelated to per cent early successional habitat in the catchment, and to other catchment and riparian forest characteristics. These results indicate that the management for upland early successional habitat has little effect on terrestrial invertebrate subsidies to headwater streams and fish. 5. Surprisingly, benthic invertebrate biomass was the one significant predictor of per cent terrestrial invertebrates in brook trout diets. Use of terrestrial invertebrate subsidies declined with increasing benthic invertebrate biomass, suggesting that productivity in the aquatic environment influences the degree to which brook trout use terrestrial subsidies. Although subsidy inputs are controlled by the donor system, this study shows that use of these subsidies by consumers can be determined by conditions in the recipient habitat.
Located in Science and Data / Brook Trout Related Publications
When are Genetic Methods Useful for Estimating Contemporary Abundance and Detecting Population Trends - Tallmon et al. 2010: This study assessed the ability of a linkage disequilibrium estimator of effective population size and a simple capture-recapture estimator of abundance to quantify the size and trend of stable or declining populations, using simulated Wright-Fisher populations.
Located in Science and Data / Brook Trout Related Publications / Chesapeake Bay Brook Trout Management Strategy-References

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