About
21
Publications
5,424
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
305
Citations
Introduction
Additional affiliations
Education
July 2007 - August 2014
September 1999 - December 2005
Publications
Publications (21)
Salmonid fishes are a widespread and economically important group of fishes that are strongly affected by anthropogenic environmental degradation. Consequently, studies on their behavior and ecology are essential for their conservation. Wild Arctic grayling (Thymallus arcticus) were observed in an unimpacted Alaskan river using underwater video obs...
Salmonid populations are often regulated by territorial competition among juveniles for food and space. In the canonical view, salmonid territories are spaced horizontally across the river bottom in a two-dimensional mosaic. However, some juveniles instead feed in tight, three-dimensional (3-D) social groups. To investigate whether territoriality i...
Invertebrate drift is a key process in riverine ecosystems controlling aquatic invertebrate distribution and availability to fish as prey. However, accurately quantifying drifting invertebrates of all sizes is difficult because the fine-mesh nets required to capture the smallest specimens clog easily, which reduces filtration efficiency and measure...
Software is now available to apply a salmonid bioenergetic drift-foraging model to generate values of net energy intake (NEI) over a range of water depths and velocities. The predictions can be used to build univariate “habitat” suitability curves or multivariate “habitat” selection models for use in instream habitat modelling programs. Capture suc...
Salmonids frequently adapt their feeding and movement strategies to cope with seasonally fluctuating stream environments. Oncorhynchus mykiss tend to drift-forage in higher velocity habitat than other salmonids, yet their presence in streams with seasonally low velocity and drift suggests behavioral flexibility. We combined 3-D videogrammetry with...
User manual for the BioenergeticHSC software program. Includes conceptual background, details on the various sub-models, instructions for how to use the program, and some guidance on how to interpret model output. This will be updated as new features are added to the software.
Habitat Suitability Curves (HSCs) are the biological component of habitat simulation tools used to evaluate instream flow management trade‐offs (e.g., the Physical Habitat Simulation Model). However, traditional HSCs based on empirical observations of habitat use relative to availability have been criticized for generating biased estimates of flow...
Quantitative habitat suitability models (HSMs) are frequently used to inform the conservation and management of lotic organisms, often in the context of instream flow management. Correlative statistical models relating hydraulic variables to habitat preferences (habitat suitability curves based on use:availability ratios) are the most common form o...
Habitat selection is an important phenomenon that may greatly affect individual fitness. Using an artificial stream, we examined the relationship between the percentage of prey captured, reactive distance, dominance, and water velocity for juvenile Chinook Salmon (Oncorhynchus tshawytscha) from the Chena River, Alaska, and tested the fitness-based...
Fisheries pedagogy frequently uses outdated instructional models, even though newer approaches, such as multimodal and active instruction, may result in better educational outcomes. We discuss a variety of innovative instructional approaches for fisheries classes, including multimodal learning via music videos, student karaoke videos, and active le...
Applications of video in fisheries research range from simple biodiversity surveys to 3-dimensional (3-D) measurement of complex swimming, schooling, feeding, and territorial behaviors. However, researchers lack a transparently developed, easy-to-use, general-purpose tool for 3-D video measurement and event logging. Thus, we developed a new measure...
Understanding cellular outcomes, such as neuronal remodeling, that are common to both healthy and diseased aging brains is essential to the development of successful brain aging strategies. Here, we used Caenorhabdits elegans to investigate how the expression of proteotoxic triggers, such as polyglutamine (polyQ)-expanded huntingtin and silencing o...
Management of aquatic resources in fire-prone areas requires understanding of fish species’ responses to wildfire and of the intermediate- and long-term consequences of these disturbances. We examined Rainbow Trout populations in 9 headwater streams 10 y after a major wildfire: 3 with no history of severe wildfire in the watershed (unburned), 3 in...
Yukon River Chinook salmon (Oncorhynchus tshawytscha) populations are declining for unknown reasons, creating hardship for thousands of stakeholders in subsistence and commercial fisheries. An informed response to this crisis requires understanding the major sources of variation in Chinook salmon productivity. However, simple stock–recruitment mode...
Management of aquatic resources in fire-prone areas requires understanding of factors that contribute to fish species’ response to wildfire and associated disturbances. We sought insight into these factors using an approach that pairs empirical observation with a mechanistic simulation. We examined population and individual characteristics of rainb...
Drift-feeding fish are challenged to discriminate between prey and similar-sized particles of debris, which are ubiquitous even in clear-water streams. Spending time and energy pursuing debris mistaken as prey could affect fish growth and the fitness potential of different foraging strategies. Our goal was to determine the extent to which debris in...
Riverine salmonid populations are often influenced by competition for food, which can affect population structure in many ways depending on the territorial behavior of individuals. This dependence has motivated many studies of salmonid territoriality, but most such work focused on adult fish in medium-sized rivers and juvenile fish in small streams...
Management of aquatic resources in fire-prone areas requires understanding of factors that contribute to fish species’ response to the effects of wildfire and associated disturbances. We sought insight into these factors using an approach that pairs empirical observation with a mechanistic simulation. We examined population and individual character...
Most models of drift-feeding behavior implicitly assume that all prey capture attempts are successful, leading to the ingestion of food that offsets the energetic and opportunity costs of each capture maneuver. The same assumption underlies the common use of prey capture attempts as a proxy for energy intake and fitness. This study examines the val...