Search

Search Results

• 1. [Article] Interaction and behavior of the redside shiner (Richardsonius balteatus) and the steelhead trout (Salmo gairdneri) in western Oregon : the influence of water temperature

  Water temperature influenced interactions between redside shiners and juvenile steelhead trout (≥1+) in the field and the laboratory. Distribution of the two species within various habitats was determined ...

  Citation × Citation Citation Abstract Copy Title: Interaction and behavior of the redside shiner (Richardsonius balteatus) and the steelhead trout (Salmo gairdneri) in western Oregon : the influence of water temperature Author: Reeves, Gordon H. Water temperature influenced interactions between redside shiners and juvenile steelhead trout (≥1+) in the field and the laboratory. Distribution of the two species within various habitats was determined in three streams with different water temperature regimes. The range of habitats occupied by trout in allopatry at cool temperatures and at intermediate temperatures in sympatry was similar but habitats occupied by shiners in allopatry at warm temperatures and in sympatry at intermediate temperatures differed. Shiners at warm temperatures in allopatry inhabited areas of intermediate depth and high velocity, similar to those inhabited by trout in the other streams. In the presence of trout at intermediate temperatures, shiners were found in deep, slow water. Water temperature and the presence of the other species influenced production, activity, and distribution of both trout and shiners in laboratory streams. Trout dominated at cool temperatures (12-15°C) and shiners prevailed at warm temperatures (19-22°C). The redside shiner exhibited two basic social organizations, loose aggregations and defense of an area. The type of organization observed varied with water temperature, abundance of food, and presence or absence of juvenile steelhead trout. The behavioral repertoire of the redside shiner was diverse. Size of the individual and proprietorship of an area were important in determining outcomes of interactions. Intensity of individual encounters varied with conditions in the laboratory streams. Plasticity of its social behavior appears to contribute to the ecological success of the redside shiner. Title: Interaction and behavior of the redside shiner (Richardsonius balteatus) and the steelhead trout (Salmo gairdneri) in western Oregon : the influence of water temperature Author: Reeves, Gordon H. Water temperature influenced interactions between redside shiners and juvenile steelhead trout (≥1+) in the field and the laboratory. Distribution of the two species within various habitats was determined in three streams with different water temperature regimes. The range of habitats occupied by trout in allopatry at cool temperatures and at intermediate temperatures in sympatry was similar but habitats occupied by shiners in allopatry at warm temperatures and in sympatry at intermediate temperatures differed. Shiners at warm temperatures in allopatry inhabited areas of intermediate depth and high velocity, similar to those inhabited by trout in the other streams. In the presence of trout at intermediate temperatures, shiners were found in deep, slow water. Water temperature and the presence of the other species influenced production, activity, and distribution of both trout and shiners in laboratory streams. Trout dominated at cool temperatures (12-15°C) and shiners prevailed at warm temperatures (19-22°C). The redside shiner exhibited two basic social organizations, loose aggregations and defense of an area. The type of organization observed varied with water temperature, abundance of food, and presence or absence of juvenile steelhead trout. The behavioral repertoire of the redside shiner was diverse. Size of the individual and proprietorship of an area were important in determining outcomes of interactions. Intensity of individual encounters varied with conditions in the laboratory streams. Plasticity of its social behavior appears to contribute to the ecological success of the redside shiner. Close

• 2. [Article] Individual condition and stream temperature influence early maturation of rainbow and steelhead trout, Oncorhynchus mykiss

  This is the publisher’s final pdf. The published article is copyrighted by Springer Science+Business Media and can be found at: http://www.springer.com.

  Citation × Citation Citation Abstract Copy Title: Individual condition and stream temperature influence early maturation of rainbow and steelhead trout, Oncorhynchus mykiss Author: Reeves, Gordon H., Jordan, Chris E., McMillan, John R., Mills, Justin S., Dunham, Jason B. This is the publisher’s final pdf. The published article is copyrighted by Springer Science+Business Media and can be found at: http://www.springer.com. Title: Individual condition and stream temperature influence early maturation of rainbow and steelhead trout, Oncorhynchus mykiss Author: Reeves, Gordon H., Jordan, Chris E., McMillan, John R., Mills, Justin S., Dunham, Jason B. This is the publisher’s final pdf. The published article is copyrighted by Springer Science+Business Media and can be found at: http://www.springer.com. Close

• 3. [Article] Climate change and vulnerability of bull trout (Salvelinus confluentus) in a fire-prone landscape

  To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by NRC Research ...

  Citation × Citation Citation Abstract Copy Title: Climate change and vulnerability of bull trout (Salvelinus confluentus) in a fire-prone landscape Author: Falke, Jeffrey A., Reeves, Gordon H., Hessburg, Paul F., Flitcroft, Rebecca L., Dunham, Jason B., McNyset, Kristina M. To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by NRC Research Press and can be found at: http://www.nrcresearchpress.com/journal/cjfas. Title: Climate change and vulnerability of bull trout (Salvelinus confluentus) in a fire-prone landscape Author: Falke, Jeffrey A., Reeves, Gordon H., Hessburg, Paul F., Flitcroft, Rebecca L., Dunham, Jason B., McNyset, Kristina M. To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by NRC Research Press and can be found at: http://www.nrcresearchpress.com/journal/cjfas. Close

• 4. [Article] Variability in expression of anadromy by female Oncorhynchus mykiss within a river network

  We described and predicted spatial variation in marine migration (anadromy) of female Oncorhynchus mykiss in the John Day River watershed, Oregon. We collected 149 juvenile O. mykiss across 72 sites and ...

  Citation × Citation Citation Abstract Copy Title: Variability in expression of anadromy by female Oncorhynchus mykiss within a river network Author: Zimmerman, Christian E., Jordan, Chris E., McMillan, John R., Mills, Justin S., Dunham, Jason B., Reeves, Gordon H. We described and predicted spatial variation in marine migration (anadromy) of female Oncorhynchus mykiss in the John Day River watershed, Oregon. We collected 149 juvenile O. mykiss across 72 sites and identified locations used by anadromous females by assigning maternal origin (anadromous versus non-anadromous) to each juvenile. These assignments used comparisons of strontium to calcium ratios in otolith primordia and freshwater growth regions to indicate maternal origin. We used logistic regression to predict probability of anadromy in relation to mean annual stream runoff using data from a subset of individuals. This model correctly predicted anadromy in a second sample of individuals with a moderate level of accuracy (e.g., 68% correctly predicted with a 0.5 classification threshold). Residuals from the models were not spatially autocorrelated, suggesting that remaining variability in the expression of anadromy was due to localized influences, as opposed to broad-scale gradients unrelated to mean annual stream runoff. These results are important for the management of O. mykiss because anadromous individuals (steelhead) within the John Day River watershed are listed as a threatened species, and it is difficult to discern juvenile steelhead from non-anadromous individuals (rainbow trout) in the field. Our results provide a broad-scale description and prediction of locations supporting anadromy, and new insight for habitat restoration, monitoring, and research to better manage and understand the expression of anadromy in O. mykiss. Title: Variability in expression of anadromy by female Oncorhynchus mykiss within a river network Author: Zimmerman, Christian E., Jordan, Chris E., McMillan, John R., Mills, Justin S., Dunham, Jason B., Reeves, Gordon H. We described and predicted spatial variation in marine migration (anadromy) of female Oncorhynchus mykiss in the John Day River watershed, Oregon. We collected 149 juvenile O. mykiss across 72 sites and identified locations used by anadromous females by assigning maternal origin (anadromous versus non-anadromous) to each juvenile. These assignments used comparisons of strontium to calcium ratios in otolith primordia and freshwater growth regions to indicate maternal origin. We used logistic regression to predict probability of anadromy in relation to mean annual stream runoff using data from a subset of individuals. This model correctly predicted anadromy in a second sample of individuals with a moderate level of accuracy (e.g., 68% correctly predicted with a 0.5 classification threshold). Residuals from the models were not spatially autocorrelated, suggesting that remaining variability in the expression of anadromy was due to localized influences, as opposed to broad-scale gradients unrelated to mean annual stream runoff. These results are important for the management of O. mykiss because anadromous individuals (steelhead) within the John Day River watershed are listed as a threatened species, and it is difficult to discern juvenile steelhead from non-anadromous individuals (rainbow trout) in the field. Our results provide a broad-scale description and prediction of locations supporting anadromy, and new insight for habitat restoration, monitoring, and research to better manage and understand the expression of anadromy in O. mykiss. Close

• 5. [Article] Demographic and phenotypic responses of juvenile steelhead trout to spatial predictability of food resources

  To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by the Ecological ...

  Citation × Citation Citation Abstract Copy Title: Demographic and phenotypic responses of juvenile steelhead trout to spatial predictability of food resources Author: Reeves, Gordon H., Sloat, Matthew R. To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by the Ecological Society of America and can be found at: http://www.esajournals.org/loi/ecol. Supplemental Material can be found at: http://www.esapubs.org/archive/ecol/E095/215/ Title: Demographic and phenotypic responses of juvenile steelhead trout to spatial predictability of food resources Author: Reeves, Gordon H., Sloat, Matthew R. To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by the Ecological Society of America and can be found at: http://www.esajournals.org/loi/ecol. Supplemental Material can be found at: http://www.esapubs.org/archive/ecol/E095/215/ Close

• 6. [Article] Influence of sex, migration distance, and latitude on life history expression in steelhead and rainbow trout (Oncorhynchus mykiss)

  To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by the NRC ...

  Citation × Citation Citation Abstract Copy Title: Influence of sex, migration distance, and latitude on life history expression in steelhead and rainbow trout (Oncorhynchus mykiss) Author: Reeves, Gordon H., Jordan, Chris E., Ohms, Haley A., Sloat, Matthew R., Dunham, Jason B. To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by the NRC Research Press and can be found at: http://www.nrcresearchpress.com/journal/cjfas. Title: Influence of sex, migration distance, and latitude on life history expression in steelhead and rainbow trout (Oncorhynchus mykiss) Author: Reeves, Gordon H., Jordan, Chris E., Ohms, Haley A., Sloat, Matthew R., Dunham, Jason B. To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by the NRC Research Press and can be found at: http://www.nrcresearchpress.com/journal/cjfas. Close

• 7. [Article] Individual condition, standard metabolic rate, and rearing temperature influence steelhead and rainbow trout (Oncorhynchus mykiss) life histories

  To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by NRC Research ...

  Citation × Citation Citation Abstract Copy Title: Individual condition, standard metabolic rate, and rearing temperature influence steelhead and rainbow trout (Oncorhynchus mykiss) life histories Author: Reeves, Gordon H., Sloat, Matthew R. To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by NRC Research Press and can be found at: http://www.nrcresearchpress.com/journal/cjfas. Title: Individual condition, standard metabolic rate, and rearing temperature influence steelhead and rainbow trout (Oncorhynchus mykiss) life histories Author: Reeves, Gordon H., Sloat, Matthew R. To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by NRC Research Press and can be found at: http://www.nrcresearchpress.com/journal/cjfas. Close