Skip to Main Content
Environmental Factors Affecting Brook Trout Occurrence in Headwater Stream SegmentsAuthor(s): Yoichiro Kanno; Benjamin H. Letcher; Ana L. Rosner; Kyle P. O'Neil; Keith H. Nislow
Source: Transactions of the American Fisheries Society
Publication Series: Scientific Journal (JRNL)
Station: Northern Research Station
View PDF (346.0 KB)
DescriptionWe analyzed the associations of catchment-scale and riparian-scale environmental factors with occurrence of Brook Trout Salvelinus fontinalis in Connecticut headwater stream segments with catchment areas of 15 < km2. A hierarchical Bayesian approach was applied to a statewide stream survey data set, in which Brook Trout detection probability was incorporated and statistical significance of environmental covariates was based on 95% credible intervals of estimated coefficients that did not overlap a value of zero. Forested land at the catchment scale was the most important covariate affecting Brook Trout occurrence; i.e., heavily forested catchments with corresponding low levels of developed and impervious land area were more likely to be occupied by Brook Trout. Coarse surficial geology (an indicator of groundwater potential) and stream slope had significantly positive effects on occurrence, whereas herbaceous plant cover and wetland and open water area had significantly negative effects. Catchment-scale and riparian-scale covariates were highly correlated in many instances, and no riparian-scale covariate was retained in the final model. Detection probability of Brook Trout at the stream-segment scale was high (mean, 0.85). Our model had a high predictive ability, and the mean value of receiver operating characteristic area under the curve was 0.80 across 100 leave-some-out iterations. The fine spatial grain of this study identified patches of suitable stream habitat for Brook Trout in Connecticut, particularly in the northwestern part. Our analysis revealed a more optimistic status of Brook Trout in Connecticut than did a coarser-grained analysis across the USA.
- Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat.
- During the capture process some typographical errors may occur.
- Please contact Sharon Hobrla, firstname.lastname@example.org if you notice any errors which make this publication unusable.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationKanno, Yoichiro; Letcher, Benjamin H.; Rosner, Ana L.; O'Neil, Kyle P.; Nislow, Keith H. 2015. Environmental Factors Affecting Brook Trout Occurrence in Headwater Stream Segments. Transactions of the American Fisheries Society. 144(2): 373-382. https://doi.org/10.1080/00028487.2014.991446.
- Have brook trout (Salvelinus fontinalis) displaced bull trout (Salvelinus confluentus) along longitudinal gradients in central Idaho streams?
- Rainbow trout versus brook trout biomass and production under varied climate regimes in small southern Appalachian streams
- Comment on Meisner (1990): Effect of climatic warming on the southern margins of the native range of brook trout, Salvelinus fontinalis
XML: View XML