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File ECMAScript program Predicting Brook Trout Occurrence in Stream Reaches throughout their Native Range in the Eastern United States
by Jean Brennan — published Feb 20, 2015 — last modified Feb 20, 2015 08:06 AM
Abstract The Brook Trout Salvelinus fontinalis is an important species of conservation concern in the eastern USA. We developed a model to predict Brook Trout population status within individual stream reaches throughout the species’ native range in the eastern USA. We utilized hierarchical logistic regression with Bayesian estimation to predict Brook Trout occurrence probability, and we allowed slopes and intercepts to vary among ecological drainage units (EDUs). Model performance was similar for 7,327 training samples and 1,832 validation samples based on the area under the receiver operating curve (»0.78) and Cohen’s kappa statistic (0.44). Predicted water temperature had a strong negative effect on Brook Trout occurrence probability at the stream reach scale and was also negatively associated with the EDU average probability of Brook Trout occurrence (i.e., EDU-specific intercepts). The effect of soil permeability was positive but decreased as EDU mean soil permeability increased. Brook Trout were less likely to occur in stream reaches surrounded by agricultural or developed land cover, and an interaction suggested that agricultural land cover also resulted in an increased sensitivity to water temperature. Our model provides a further understanding of how Brook Trout are shaped by habitat characteristics in the region and yields maps of stream-reach-scale predictions, which together can be used to support ongoing conservation and management efforts. These decision support tools can be used to identify the extent of potentially suitable habitat, estimate historic habitat losses, and prioritize conservation efforts by selecting suitable stream reaches for a given action. Future work could extend the model to account for additional landscape or habitat characteristics, include biotic interactions, or estimate potential Brook Trout responses to climate and land use changes.
Located in News & Events / … / Brook Trout and Stream Temperature Workshop Information / Resource Materials: Reprints
File Pascal source code Presentation by Maddie Brown - Research Results - Partnership
by Jean Brennan — published Apr 24, 2018 — last modified Apr 26, 2018 08:45 PM
pdf copy of PPT slides used by Dr. Brown in "reporting out" to the Partnership on the research project of the AppLCC Partner organizational representatives. See report for full methodology etc. and the "Partner Dashboard" that graphically captures the research results.
Located in Projects / … / Integrating Cultural Resource Preservation at a Landscape Level / Cultural Resources Fellowship
Relevant reprints
by Jean Brennan — published Feb 20, 2015
As referenced in Ben Letcher's 2014 Presentation Slides (partial list)
Located in News & Events / … / Brook Trout and Stream Temperature Workshop Information / Resource Materials: Reprints
File Spatial and Temporal Dynamics in Brook Trout Density: Implications for Population Monitoring
by Jean Brennan — published Feb 19, 2015 — last modified Feb 20, 2015 01:15 PM
T.Wagner et al., Abstract Many potential stressors to aquatic environments operate over large spatial scales, prompting the need to assess and monitor both site-specific and regional dynamics of fish populations. We used hierarchical Bayesian models to evaluate the spatial and temporal variability in density and capture probability of age-1 and older Brook Trout Salvelinus fontinalis from three-pass removal data collected at 291 sites over a 37-year time period (1975–2011) in Pennsylvania streams. There was high between-year variability in density, with annual posterior means ranging from 2.1 to 10.2 fish/100 m2 ; however, there was no significant long-term linear trend. Brook Trout density was positively correlated with elevation and negatively correlated with percent developed land use in the network catchment. Probability of capture did not vary substantially across sites or years but was negatively correlated with mean stream width. Because of the low spatiotemporal variation in capture probability and a strong correlation between first-pass CPUE (catch/min) and three-pass removal density estimates, the use of an abundance index based on first-pass CPUE could represent a cost-effective alternative to conducting multiple-pass removal sampling for some Brook Trout monitoring and assessment objectives. Single-pass indices may be particularly relevant for monitoring objectives that do not require precise site-specific estimates, such as regional monitoring programs that are designed to detect long-term linear trends in density.
Located in News & Events / … / Brook Trout and Stream Temperature Workshop Information / Resource Materials: Reprints
File State Stream Temperature Compilation
by Jean Brennan — published Feb 12, 2015 — last modified Feb 20, 2015 12:49 PM
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Located in News & Events / … / Resource Materials: Previous Workshops / 2012 Stream Temperature Data and Modeling (Meeting I)
File State Stream Temperature Compilation
by Jean Brennan — published Feb 12, 2015 — last modified Feb 13, 2015 09:56 PM
PPT slides provided by Jana Stewart. "Water Temperature Monitoring Efforts by Individual Agencies"
Located in News & Events / … / Stream Temperature Workshop Information / Resource Materials: Presentations
File ECMAScript program Stream Temperature Data and Modeling Meeting Notes
by Jean Brennan — published Feb 20, 2015 — last modified Feb 20, 2015 07:33 AM
NALCC Aquatic Technical Team Meeting, 2012
Located in News & Events / … / Resource Materials: Previous Workshops / 2012 Stream Temperature Data and Modeling (Meeting I)
File Troff document Stream Temperature Modeler Questionnaire (draft)
by Jean Brennan — published Feb 12, 2015 — last modified Feb 13, 2015 09:56 PM
Prepared by Jana Stewart for review and discussion: planning call Feb 12th
Located in News & Events / … / Stream Temperature Workshop Information / Advance Materials
File Troff document Stream Temperature Questionnaire PDF
by Jean Brennan — published Feb 12, 2015 — last modified Mar 20, 2015 12:44 AM
Modelers Questionnaire [Jana Stewart Coordinating] Brook trout Research Questionnaire [Steve Faulkner Coordinating] Research Profile (Template) [Rachel Muir Coordinating]
Located in News & Events / … / Brook Trout and Stream Temperature Workshop Information / April 2015 Workshop Materials & Logistical Information
Summary (Feb 19th) call
by Jean Brennan — published Feb 26, 2015 — last modified Feb 27, 2015 08:20 AM
Workshop Planning Team: notes from Feb 19th call (provide feedback to JanaS).
Located in News & Events / … / Brook Trout and Stream Temperature Workshop Information / April 2015 Workshop Materials & Logistical Information