Conference Proceedings Copyright (c) 2013 University of Massachusetts - Amherst All rights reserved. http://scholarworks.umass.edu/fishpassage_conference_proceedings Recent documents in Conference Proceedings en-us Fri, 15 Feb 2013 11:05:49 PST 3600 Sensitivity and Vulnerability of Brook Trout Populations to Climate Change http://scholarworks.umass.edu/fishpassage_conference_proceedings/542 http://scholarworks.umass.edu/fishpassage_conference_proceedings/542 Wed, 29 Aug 2012 09:04:49 PDT 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.

]]> Trumbo, Bradly A. et al. Relating dam passage time of adult salmon to varying river conditions using time-to-event analysis http://scholarworks.umass.edu/fishpassage_conference_proceedings/541 http://scholarworks.umass.edu/fishpassage_conference_proceedings/541 Tue, 17 Apr 2012 08:30:27 PDT Although many hydroelectric darns have fishways for upstream passage of migratory fish, passage delays often occur at these sites. Migrational delay may affect fish detrimentally in several ways, including depletion of energy reserves, suboptimal arrival timing at spawning sites, and prolonged exposure to hazardous conditions at the face of dams. We applied time-to-event analyses to passage times of radio-tagged adult Chinook salmon Oncorhynchus tshawytscha at four dams on the lower Columbia River, where many fish require several days to pass each dam. The analysis allowed us to determine instantaneous passage rates in response to fluctuating river conditions. By relating variability in passage rate to the predictor variables river temperature, river flow, and fish size, we determined the relative contribution of various factors to the passage time of migrating fish. We fit the model by maximizing the likelihood function that incorporated information from individuals rather than aggregated groups of fish. We used Akaike's Information Criterion to distinguish among several competing models, each of which used a different predictor variable. We found that daytime passage rates were significantly greater than nighttime passage rates. Also, the influence of river flow, river temperature, and fish length on passage rates varied at the four dams. However, when a factor had a significant influence on passage time, the direction of the relationship was consistent across dams: river flow and fish length were positively related to passage time (greater values led to longer passage time), and. river temperature was negatively related. This method is easily adaptable to study passage time of any fish population facing a broad range of obstacles to migration, whether natural or man-made.

]]> Zabel, R W. et al. Current controversies in the study of salmon homing http://scholarworks.umass.edu/fishpassage_conference_proceedings/540 http://scholarworks.umass.edu/fishpassage_conference_proceedings/540 Tue, 17 Apr 2012 08:19:09 PDT Quinn, T P. Fish migration in the Murray Darling system and the decline of the silver perch http://scholarworks.umass.edu/fishpassage_conference_proceedings/539 http://scholarworks.umass.edu/fishpassage_conference_proceedings/539 Tue, 17 Apr 2012 08:17:17 PDT Mallen-Cooper, M et al. The use of radio telemetry for optimizing fish pass design http://scholarworks.umass.edu/fishpassage_conference_proceedings/538 http://scholarworks.umass.edu/fishpassage_conference_proceedings/538 Tue, 17 Apr 2012 08:11:15 PDT Larinier, M et al. The influence of anthropogenic factors to Lithuanian rivers flow regime http://scholarworks.umass.edu/fishpassage_conference_proceedings/527 http://scholarworks.umass.edu/fishpassage_conference_proceedings/527 Tue, 20 Mar 2012 16:09:23 PDT Zdankus, N et al. Management of Rivers and Coastal Waters under the Aspect of Ecologically Oriented Engineering http://scholarworks.umass.edu/fishpassage_conference_proceedings/526 http://scholarworks.umass.edu/fishpassage_conference_proceedings/526 Tue, 20 Mar 2012 16:09:04 PDT Wetzel, V Behavioral Results from Acoustically Tagged Fish Using Innovative Techniques for Analyzing Three-Dimensional Data http://scholarworks.umass.edu/fishpassage_conference_proceedings/525 http://scholarworks.umass.edu/fishpassage_conference_proceedings/525 Tue, 20 Mar 2012 16:08:47 PDT Steig, T W. et al. Economic fish passage - An innovative alternative http://scholarworks.umass.edu/fishpassage_conference_proceedings/524 http://scholarworks.umass.edu/fishpassage_conference_proceedings/524 Tue, 20 Mar 2012 16:08:30 PDT Showers, C G. Modification of Crump weir to facilitate fish passage http://scholarworks.umass.edu/fishpassage_conference_proceedings/523 http://scholarworks.umass.edu/fishpassage_conference_proceedings/523 Tue, 20 Mar 2012 16:08:13 PDT Sarker, M A. et al.