David Ward (Former Employee)
Science and Products
Filter Total Items: 32
An evaluation of sedatives for use in transport of juvenile endangered fishes in plastic bags An evaluation of sedatives for use in transport of juvenile endangered fishes in plastic bags
Trucks and aircraft typically transport rare or endangered fishes in large unsealed tanks containing large volumes of water (typically hundreds of liters) during conservation efforts. Ornamental fishes, however, are commonly sent by mail in small sealed plastic bags filled with oxygen, minimal water, and a small amount of sedative to reduce weight and overall shipping costs. Our goal was...
Authors
Laura A. Tennant, Ben M. Vaage, David L. Ward
Geographic variation in the intensity of warming and phenological mismatch between Arctic shorebirds and invertebrates Geographic variation in the intensity of warming and phenological mismatch between Arctic shorebirds and invertebrates
Responses to climate change can vary across functional groups and trophic levels, leading to a temporal decoupling of trophic interactions or ‘phenological mismatches.’ Despite a growing number of single-species studies that identified phenological mismatches as a nearly universal consequence of climate change, we have a limited understanding of the spatial variation in the intensity of...
Authors
Enubi Kwon, Emily L. Weiser, Richard B. Lanctot, Stephen C. Brown, H. River Gates, H. Grant Gilchrist, Steve J. Kendall, David B. Lank, Joseph R. Liebezeit, Laura McKinnon, Erica Nol, David C. Payer, Jennie Rausch, Sarah T. Saalfeld, Daniel J. Rinella, Nathan R. Senner, David Ward, Paul A. Smith, Robert C. Wissman, Brett K. Sandercock
What environmental conditions reduce predation vulnerability for juvenile Colorado River native fishes? What environmental conditions reduce predation vulnerability for juvenile Colorado River native fishes?
The incompatibility of native Colorado River fishes and nonnative warm-water sport fishes is well documented with predation by nonnative species causing rapid declines and even extirpation of native species in most locations. In a few rare instances native fishes are able to survive and recruit despite the presence of nonnative warm water predators, indicating that specific environmental
Authors
David L. Ward, Benjamin Vaage
Change in dominance determines herbivore effects on plant biodiversity Change in dominance determines herbivore effects on plant biodiversity
Herbivores alter plant biodiversity (species richness) in many of the world’s ecosystems, but the magnitude and the direction of herbivore effects on biodiversity vary widely within and among ecosystems. One current theory predicts that herbivores enhance plant biodiversity at high productivity but have the opposite effect at low productivity. Yet, empirical support for the importance of...
Authors
Sally E. Koerner, Melinda D. Smith, Deron E. Burkepile, Niall P. Hanan, Meghan L. Avolio, Scott L. Collins, Alan K. Knapp, Nathan P. Lemoine, Elisabeth J. Forrestel, Stephanie Eby, Dave I. Thompson, Gerardo A. Aguado-Santacruz, John P. Anderson, T. Michael Anderson, Ayana Angassa, Sumanta Bagchi, Elisabeth S. Bakker, Gary Bastin, Lauren E. Baur, Karen H. Beard, Erik A. Beever, Patrick J. Bohlen, Elizabeth H. Boughton, Don Canestro, Ariela Cesa, Enrique Chaneton, Jimin Cheng, Carla M. D’Antonio, Claire Deleglise, Fadiala Dembele, Josh Dorrough, David J. Eldridge, Barbara Fernandez-Going, Silvia Fernandez-Lugo, Lauchlan H. Fraser, Bill Freedman, Gonzalo Garcia-Salgado, Jacob R. Goheen, Liang Guo, Sean Husheer, Moussa Karembe, Johannes M. H. Knops, Tineke Kraaij, Andrew Kulmatiski, Minna-Maarit Kytoviita, Felipe Lezama, Gregory Loucougaray, Alejandro Loydi, Daniel G. Milchunas, Suzanne J. Milton, John W. Morgan, Claire Moxham, Kyle C. Nehring, Han Olff, Todd M. Palmer, Salvador Rebollo, Corinna Riginos, Anita C. Risch, Marta Rueda, Mahesh Sankaran, Takehiro Sasaki, Kathryn A. Schoenecker, Nick L. Schultz, Martin Schutz, Angelika Schwabe, Frances Siebert, Christian Smit, Karen A. Stahlheber, Christian Storm, Dustin J. Strong, Jishuai Su, Yadugiri V. Tiruvaimozhi, Claudia Tyler, James Val, Martijn L. Vandegehuchte, Kari E. Veblen, Lance Vermeire, David Ward, Jianshuang Wu, Truman P. Young, Qiang Yu, Tamara J. Zelikova
Are hatchery-reared Rainbow Trout and Brown Trout effective predators on juvenile native fish? Are hatchery-reared Rainbow Trout and Brown Trout effective predators on juvenile native fish?
Hatchery‐reared Rainbow Trout Oncorhynchus mykiss and Brown Trout Salmo trutta are typically fed exclusively on commercially prepared pelleted feeds and have no experience catching or consuming live fish at the time of stocking. Despite this lack of predation experience, it is commonly assumed that stocked Rainbow Trout and Brown Trout will adversely impact native fish populations by...
Authors
David L. Ward, Rylan Morton-Starner, Benjamin Vaage
Effectiveness of ultrasonic imaging for evaluating presence and maturity of eggs in fishes in remote field locations Effectiveness of ultrasonic imaging for evaluating presence and maturity of eggs in fishes in remote field locations
Ultrasonic imaging is an effective, nonlethal method used to determine sex and maturity in a variety of fishes. However, many previous studies of this technique have been performed in laboratory environments. Using Common Carp Cyprinus carpio, we developed a standardized method for ultrasonically scanning cyprinids, and we accurately sexed 78% (N = 58) of those individuals. We then...
Authors
Morgan E. Brizendine, David Ward, Scott A. Bonar
Science and Products
Filter Total Items: 32
An evaluation of sedatives for use in transport of juvenile endangered fishes in plastic bags An evaluation of sedatives for use in transport of juvenile endangered fishes in plastic bags
Trucks and aircraft typically transport rare or endangered fishes in large unsealed tanks containing large volumes of water (typically hundreds of liters) during conservation efforts. Ornamental fishes, however, are commonly sent by mail in small sealed plastic bags filled with oxygen, minimal water, and a small amount of sedative to reduce weight and overall shipping costs. Our goal was...
Authors
Laura A. Tennant, Ben M. Vaage, David L. Ward
Geographic variation in the intensity of warming and phenological mismatch between Arctic shorebirds and invertebrates Geographic variation in the intensity of warming and phenological mismatch between Arctic shorebirds and invertebrates
Responses to climate change can vary across functional groups and trophic levels, leading to a temporal decoupling of trophic interactions or ‘phenological mismatches.’ Despite a growing number of single-species studies that identified phenological mismatches as a nearly universal consequence of climate change, we have a limited understanding of the spatial variation in the intensity of...
Authors
Enubi Kwon, Emily L. Weiser, Richard B. Lanctot, Stephen C. Brown, H. River Gates, H. Grant Gilchrist, Steve J. Kendall, David B. Lank, Joseph R. Liebezeit, Laura McKinnon, Erica Nol, David C. Payer, Jennie Rausch, Sarah T. Saalfeld, Daniel J. Rinella, Nathan R. Senner, David Ward, Paul A. Smith, Robert C. Wissman, Brett K. Sandercock
What environmental conditions reduce predation vulnerability for juvenile Colorado River native fishes? What environmental conditions reduce predation vulnerability for juvenile Colorado River native fishes?
The incompatibility of native Colorado River fishes and nonnative warm-water sport fishes is well documented with predation by nonnative species causing rapid declines and even extirpation of native species in most locations. In a few rare instances native fishes are able to survive and recruit despite the presence of nonnative warm water predators, indicating that specific environmental
Authors
David L. Ward, Benjamin Vaage
Change in dominance determines herbivore effects on plant biodiversity Change in dominance determines herbivore effects on plant biodiversity
Herbivores alter plant biodiversity (species richness) in many of the world’s ecosystems, but the magnitude and the direction of herbivore effects on biodiversity vary widely within and among ecosystems. One current theory predicts that herbivores enhance plant biodiversity at high productivity but have the opposite effect at low productivity. Yet, empirical support for the importance of...
Authors
Sally E. Koerner, Melinda D. Smith, Deron E. Burkepile, Niall P. Hanan, Meghan L. Avolio, Scott L. Collins, Alan K. Knapp, Nathan P. Lemoine, Elisabeth J. Forrestel, Stephanie Eby, Dave I. Thompson, Gerardo A. Aguado-Santacruz, John P. Anderson, T. Michael Anderson, Ayana Angassa, Sumanta Bagchi, Elisabeth S. Bakker, Gary Bastin, Lauren E. Baur, Karen H. Beard, Erik A. Beever, Patrick J. Bohlen, Elizabeth H. Boughton, Don Canestro, Ariela Cesa, Enrique Chaneton, Jimin Cheng, Carla M. D’Antonio, Claire Deleglise, Fadiala Dembele, Josh Dorrough, David J. Eldridge, Barbara Fernandez-Going, Silvia Fernandez-Lugo, Lauchlan H. Fraser, Bill Freedman, Gonzalo Garcia-Salgado, Jacob R. Goheen, Liang Guo, Sean Husheer, Moussa Karembe, Johannes M. H. Knops, Tineke Kraaij, Andrew Kulmatiski, Minna-Maarit Kytoviita, Felipe Lezama, Gregory Loucougaray, Alejandro Loydi, Daniel G. Milchunas, Suzanne J. Milton, John W. Morgan, Claire Moxham, Kyle C. Nehring, Han Olff, Todd M. Palmer, Salvador Rebollo, Corinna Riginos, Anita C. Risch, Marta Rueda, Mahesh Sankaran, Takehiro Sasaki, Kathryn A. Schoenecker, Nick L. Schultz, Martin Schutz, Angelika Schwabe, Frances Siebert, Christian Smit, Karen A. Stahlheber, Christian Storm, Dustin J. Strong, Jishuai Su, Yadugiri V. Tiruvaimozhi, Claudia Tyler, James Val, Martijn L. Vandegehuchte, Kari E. Veblen, Lance Vermeire, David Ward, Jianshuang Wu, Truman P. Young, Qiang Yu, Tamara J. Zelikova
Are hatchery-reared Rainbow Trout and Brown Trout effective predators on juvenile native fish? Are hatchery-reared Rainbow Trout and Brown Trout effective predators on juvenile native fish?
Hatchery‐reared Rainbow Trout Oncorhynchus mykiss and Brown Trout Salmo trutta are typically fed exclusively on commercially prepared pelleted feeds and have no experience catching or consuming live fish at the time of stocking. Despite this lack of predation experience, it is commonly assumed that stocked Rainbow Trout and Brown Trout will adversely impact native fish populations by...
Authors
David L. Ward, Rylan Morton-Starner, Benjamin Vaage
Effectiveness of ultrasonic imaging for evaluating presence and maturity of eggs in fishes in remote field locations Effectiveness of ultrasonic imaging for evaluating presence and maturity of eggs in fishes in remote field locations
Ultrasonic imaging is an effective, nonlethal method used to determine sex and maturity in a variety of fishes. However, many previous studies of this technique have been performed in laboratory environments. Using Common Carp Cyprinus carpio, we developed a standardized method for ultrasonically scanning cyprinids, and we accurately sexed 78% (N = 58) of those individuals. We then...
Authors
Morgan E. Brizendine, David Ward, Scott A. Bonar