Colleen Caldwell, PhD (Former Employee)
Science and Products
Filter Total Items: 34
Adult survival, apparent lamb survival, and body condition of desert bighorn sheep in relation to habitat and precipitation on the Kofa National Wildlife Refuge, Arizona Adult survival, apparent lamb survival, and body condition of desert bighorn sheep in relation to habitat and precipitation on the Kofa National Wildlife Refuge, Arizona
The decline of desert bighorn sheep on the Kofa National Wildlife Refuge (KNWR) beginning in 2003 stimulated efforts to determine the factors limiting survival and recruitment. We 1) determined pregnancy rates, body fat, and estimated survival rates of adults and lambs; 2) investigated the relationship between precipitation, forage conditions, previous year’s reproductive success, and...
Authors
Matthew Overstreet, Colleen A. Caldwell, James W. Cain
Prescribed-fire effects on an aquatic community of a southwest montane grassland system Prescribed-fire effects on an aquatic community of a southwest montane grassland system
The use of prescription fire has long been recognized as a reliable management tool to suppress vegetative succession processes and to reduce fuel loading to prevent catastrophic wildfires, but very little attention has been paid to the effects on aquatic systems. A late-fall prescribed burn was implemented to characterize effects on an aquatic community within a montane grassland system...
Authors
Colleen A. Caldwell, Gerald Z. Jacobi, Michael C. Anderson, Robert R. Parmenter, Jeanine McGann, William R. Gould, Robert DuBey, M. Donna Jacobi
Estimating suitable environments for invasive plant species across large landscapes: a remote sensing strategy using Landsat 7 ETM+ Estimating suitable environments for invasive plant species across large landscapes: a remote sensing strategy using Landsat 7 ETM+
The key to reducing ecological and economic damage caused by invasive plant species is to locate and eradicate new invasions before they threaten native biodiversity and ecological processes. We used Landsat Enhanced Thematic Mapper Plus imagery to estimate suitable environments for four invasive plants in Big Bend National Park, southwest Texas, using a presence-only modeling approach...
Authors
Kendal E. Young, Laurie B. Abbott, Colleen A. Caldwell, T. Scott Schrader
Water temperature and baseflow discharge of streams throughout the range of Rio Grande cutthroat trout in Colorado and New Mexico—2010 and 2011 Water temperature and baseflow discharge of streams throughout the range of Rio Grande cutthroat trout in Colorado and New Mexico—2010 and 2011
This study characterized the thermal regime in a number of Colorado and New Mexico streams that contain populations of Rio Grande cutthroat trout (Oncorhynchus clarkii virginalis) and had no previous record of continual temperature records. When compared to Colorado’s water temperature criteria (Cold Tier 1), a portion of these populations appeared to be at risk from elevated stream...
Authors
Matthew P. Zeigler, Andrew S. Todd, Colleen A. Caldwell
Evidence of recent climate change within the historic range of Rio Grande cutthroat trout: implications for management and future persistence Evidence of recent climate change within the historic range of Rio Grande cutthroat trout: implications for management and future persistence
Evidence of anthropogenically influenced climate change has motivated natural resource managers to incorporate adaptive measures to minimize risks to sensitive and threatened species. Detecting trends in climate variables (i.e., air temperature and hydrology) can serve as a valuable management tool for protecting vulnerable species by increasing our understanding of localized conditions...
Authors
Matthew P. Zeigler, Andrew S. Todd, Colleen A. Caldwell
Relationship between fish size and upper thermal tolerance Relationship between fish size and upper thermal tolerance
Using critical thermal maximum (CTMax) tests, we examined the relationship between upper temperature tolerances and fish size (fry-adult or subadult lengths) of rainbow trout Oncorhynchus mykiss (41-200-mm TL), Apache trout O. gilae apache (40-220-mm TL), largemouth bass Micropterus salmoides (72-266-mm TL), Nile tilapia Oreochromis niloticus (35-206-mm TL), channel catfish Ictalurus...
Authors
Matthew S. Recsetar, Matthew P. Zeigler, David L. Ward, Scott A. Bonar, Colleen A. Caldwell
Science and Products
Filter Total Items: 34
Adult survival, apparent lamb survival, and body condition of desert bighorn sheep in relation to habitat and precipitation on the Kofa National Wildlife Refuge, Arizona Adult survival, apparent lamb survival, and body condition of desert bighorn sheep in relation to habitat and precipitation on the Kofa National Wildlife Refuge, Arizona
The decline of desert bighorn sheep on the Kofa National Wildlife Refuge (KNWR) beginning in 2003 stimulated efforts to determine the factors limiting survival and recruitment. We 1) determined pregnancy rates, body fat, and estimated survival rates of adults and lambs; 2) investigated the relationship between precipitation, forage conditions, previous year’s reproductive success, and...
Authors
Matthew Overstreet, Colleen A. Caldwell, James W. Cain
Prescribed-fire effects on an aquatic community of a southwest montane grassland system Prescribed-fire effects on an aquatic community of a southwest montane grassland system
The use of prescription fire has long been recognized as a reliable management tool to suppress vegetative succession processes and to reduce fuel loading to prevent catastrophic wildfires, but very little attention has been paid to the effects on aquatic systems. A late-fall prescribed burn was implemented to characterize effects on an aquatic community within a montane grassland system...
Authors
Colleen A. Caldwell, Gerald Z. Jacobi, Michael C. Anderson, Robert R. Parmenter, Jeanine McGann, William R. Gould, Robert DuBey, M. Donna Jacobi
Estimating suitable environments for invasive plant species across large landscapes: a remote sensing strategy using Landsat 7 ETM+ Estimating suitable environments for invasive plant species across large landscapes: a remote sensing strategy using Landsat 7 ETM+
The key to reducing ecological and economic damage caused by invasive plant species is to locate and eradicate new invasions before they threaten native biodiversity and ecological processes. We used Landsat Enhanced Thematic Mapper Plus imagery to estimate suitable environments for four invasive plants in Big Bend National Park, southwest Texas, using a presence-only modeling approach...
Authors
Kendal E. Young, Laurie B. Abbott, Colleen A. Caldwell, T. Scott Schrader
Water temperature and baseflow discharge of streams throughout the range of Rio Grande cutthroat trout in Colorado and New Mexico—2010 and 2011 Water temperature and baseflow discharge of streams throughout the range of Rio Grande cutthroat trout in Colorado and New Mexico—2010 and 2011
This study characterized the thermal regime in a number of Colorado and New Mexico streams that contain populations of Rio Grande cutthroat trout (Oncorhynchus clarkii virginalis) and had no previous record of continual temperature records. When compared to Colorado’s water temperature criteria (Cold Tier 1), a portion of these populations appeared to be at risk from elevated stream...
Authors
Matthew P. Zeigler, Andrew S. Todd, Colleen A. Caldwell
Evidence of recent climate change within the historic range of Rio Grande cutthroat trout: implications for management and future persistence Evidence of recent climate change within the historic range of Rio Grande cutthroat trout: implications for management and future persistence
Evidence of anthropogenically influenced climate change has motivated natural resource managers to incorporate adaptive measures to minimize risks to sensitive and threatened species. Detecting trends in climate variables (i.e., air temperature and hydrology) can serve as a valuable management tool for protecting vulnerable species by increasing our understanding of localized conditions...
Authors
Matthew P. Zeigler, Andrew S. Todd, Colleen A. Caldwell
Relationship between fish size and upper thermal tolerance Relationship between fish size and upper thermal tolerance
Using critical thermal maximum (CTMax) tests, we examined the relationship between upper temperature tolerances and fish size (fry-adult or subadult lengths) of rainbow trout Oncorhynchus mykiss (41-200-mm TL), Apache trout O. gilae apache (40-220-mm TL), largemouth bass Micropterus salmoides (72-266-mm TL), Nile tilapia Oreochromis niloticus (35-206-mm TL), channel catfish Ictalurus...
Authors
Matthew S. Recsetar, Matthew P. Zeigler, David L. Ward, Scott A. Bonar, Colleen A. Caldwell