Michael Dodrill
Michael is a Fish Biologist working for the USGS, Columbia River Research Laboratory.
Science and Products
Filter Total Items: 18
Colorado River fish monitoring in Grand Canyon, Arizona; 2002–14 humpback chub aggregations
The humpback chub (Gila cypha) is an endangered cyprinid species endemic to the Colorado River. The largest remaining population of the species spawns and rears in the Little Colorado River in Grand Canyon. Construction and operation of Glen Canyon Dam has altered the main-stem Colorado River in Glen and Grand Canyons. Cold, clear water releases from the dam result in a river that is generally uns
Authors
William R. Persons, David R. Van Haverbeke, Michael J. Dodrill
Nonlinear relationships can lead to bias in biomass calculations and drift-foraging models when using summaries of invertebrate drift data
Drift-foraging models offer a mechanistic description of how fish feed in flowing water and the application of drift-foraging bioenergetics models to answer both applied and theoretical questions in aquatic ecology is growing. These models typically include nonlinear descriptions of ecological processes and as a result may be sensitive to how model inputs are summarized because of a mathematical p
Authors
Michael J. Dodrill, Charles B. Yackulic
Assessing predation risks for small fish in a large river ecosystem between contrasting habitats and turbidity conditions
This study examined predation risk for juvenile native fish between two riverine shoreline habitats, backwater and debris fan, across three discrete turbidity levels (low, intermediate, high) to understand environmental risks associated with habitat use in a section of the Colorado River in Grand Canyon, AZ. Inferences are particularly important to juvenile native fish, including the federally end
Authors
Michael J. Dodrill, Mike Yard, William E. Pine
Prey size and availability limits maximum size of rainbow trout in a large tailwater: insights from a drift-foraging bioenergetics model
The cold and clear water conditions present below many large dams create ideal conditions for the development of economically important salmonid fisheries. Many of these tailwater fisheries have experienced declines in the abundance and condition of large trout species, yet the causes of these declines remain uncertain. Here, we develop, assess, and apply a drift-foraging bioenergetics model to id
Authors
Michael J. Dodrill, Charles B. Yackulic, Theodore A. Kennedy, John W Haye
Do management actions to restore rare habitat benefit native fish conservation? Distribution of juvenile native fish among shoreline habitats of the Colorado River
Many management actions in aquatic ecosystems are directed at restoring or improving specific habitats to benefit fish populations. In the Grand Canyon reach of the Colorado River, experimental flow operations as part of the Glen Canyon Dam Adaptive Management Program have been designed to restore sandbars and associated backwater habitats. Backwaters can have warmer water temperatures than other
Authors
Michael J. Dodrill, Charles B. Yackulic, Brandon Gerig, William E. Pine, Josh Korman, Colton Finch
Assessing juvenile native fish demographic responses to a steady flow experiment in a large regulated river
The Colorado River below Glen Canyon Dam, Arizona, is part of an adaptive management programme which optimizes dam operations to improve various resources in the downstream ecosystem within Grand Canyon. Understanding how populations of federally endangered humpback chub Gila cypha respond to these dam operations is a high priority. Here, we test hypotheses concerning temporal variation in juvenil
Authors
Colton G. Finch, William E. Pine, Charles B. Yackulic, Michael J. Dodrill, Michael D. Yard, Brandon S. Gerig, Lewis G. Coggins,, Josh Korman
Science and Products
Filter Total Items: 18
Colorado River fish monitoring in Grand Canyon, Arizona; 2002–14 humpback chub aggregations
The humpback chub (Gila cypha) is an endangered cyprinid species endemic to the Colorado River. The largest remaining population of the species spawns and rears in the Little Colorado River in Grand Canyon. Construction and operation of Glen Canyon Dam has altered the main-stem Colorado River in Glen and Grand Canyons. Cold, clear water releases from the dam result in a river that is generally uns
Authors
William R. Persons, David R. Van Haverbeke, Michael J. Dodrill
Nonlinear relationships can lead to bias in biomass calculations and drift-foraging models when using summaries of invertebrate drift data
Drift-foraging models offer a mechanistic description of how fish feed in flowing water and the application of drift-foraging bioenergetics models to answer both applied and theoretical questions in aquatic ecology is growing. These models typically include nonlinear descriptions of ecological processes and as a result may be sensitive to how model inputs are summarized because of a mathematical p
Authors
Michael J. Dodrill, Charles B. Yackulic
Assessing predation risks for small fish in a large river ecosystem between contrasting habitats and turbidity conditions
This study examined predation risk for juvenile native fish between two riverine shoreline habitats, backwater and debris fan, across three discrete turbidity levels (low, intermediate, high) to understand environmental risks associated with habitat use in a section of the Colorado River in Grand Canyon, AZ. Inferences are particularly important to juvenile native fish, including the federally end
Authors
Michael J. Dodrill, Mike Yard, William E. Pine
Prey size and availability limits maximum size of rainbow trout in a large tailwater: insights from a drift-foraging bioenergetics model
The cold and clear water conditions present below many large dams create ideal conditions for the development of economically important salmonid fisheries. Many of these tailwater fisheries have experienced declines in the abundance and condition of large trout species, yet the causes of these declines remain uncertain. Here, we develop, assess, and apply a drift-foraging bioenergetics model to id
Authors
Michael J. Dodrill, Charles B. Yackulic, Theodore A. Kennedy, John W Haye
Do management actions to restore rare habitat benefit native fish conservation? Distribution of juvenile native fish among shoreline habitats of the Colorado River
Many management actions in aquatic ecosystems are directed at restoring or improving specific habitats to benefit fish populations. In the Grand Canyon reach of the Colorado River, experimental flow operations as part of the Glen Canyon Dam Adaptive Management Program have been designed to restore sandbars and associated backwater habitats. Backwaters can have warmer water temperatures than other
Authors
Michael J. Dodrill, Charles B. Yackulic, Brandon Gerig, William E. Pine, Josh Korman, Colton Finch
Assessing juvenile native fish demographic responses to a steady flow experiment in a large regulated river
The Colorado River below Glen Canyon Dam, Arizona, is part of an adaptive management programme which optimizes dam operations to improve various resources in the downstream ecosystem within Grand Canyon. Understanding how populations of federally endangered humpback chub Gila cypha respond to these dam operations is a high priority. Here, we test hypotheses concerning temporal variation in juvenil
Authors
Colton G. Finch, William E. Pine, Charles B. Yackulic, Michael J. Dodrill, Michael D. Yard, Brandon S. Gerig, Lewis G. Coggins,, Josh Korman