TY - JOUR
T1 - Do Endangered Razorback Suckers Have Poor Larval Escape Performance Relative to Introduced Rainbow Trout?
AU - Wesp, Heather M.
AU - Gibb, Alice C.
N1 - Funding Information:
We thank Carol Chambers, W. Linn Montgomery, and Tad Theimer for their thoughtful advice and contributions to this research. We also recognize Chester Figiel of the U.S. Fish and Wildlife Service for providing razorback sucker eggs and members the of Nishikawa and Gibb laboratories, particularly Kiisa Nishikawa, Jenna Monroy, Kaolin Cummens, and Tammy Frost, for providing assistance, equipment, and laboratory space. We thank Jeff Walker and Alistair Cullum for providing software programs and advice that were essential for the completion of the project. Brook Swanson, Matt O’Neill, Heidie Hornsta, Amy Arnold, Cydney Landels, Kristine Salminen, Tom Johnston, Dennis DeVries, and several anonymous reviewers provided thoughtful comments on the manuscript. This research was funded through two grants awarded to A.C.G., a Northern Arizona University intramural research grant and National Science Foundation grant IBN-0002301.
PY - 2003/11
Y1 - 2003/11
N2 - Poor recruitment has generated the hypothesis that the endangered razorback sucker Xyrauchen texanus is particularly vulnerable to predation early in its life history. We compared the escape responses of razorback suckers, which are adapted to the historically warm waters of the Colorado River, with those of rainbow trout Oncorhynchus mykiss, an introduced coldwater species, throughout early development at water temperatures of 12°C and 18°C. We quantified escape performance using maximum velocity, acceleration, and time to maximum velocity and acceleration. Both species showed complete temperature compensation for escape performance; individuals reared at 12°C performed as well as those reared at 18°C. Performance was also similar between species, although two variables exhibited a species X size interaction. Small razorback suckers were faster (greater maximum velocity and acceleration) than small rainbow trout, while large larvae performed similarly. We also determined that razorback sucker larval escape performance falls within the range reported for other fishes. Therefore, we conclude that razorback suckers do not have "poor" escape performance and that temperature does not directly cause decreased performance. However, a cold temperature reduces growth rates and delays razorback suckers' attainment of a "predator- proof" size. Small larvae are also more likely to perform uncoordinated, ineffective escape responses. Hence, razorback sucker performance is indirectly diminished by temperature.
AB - Poor recruitment has generated the hypothesis that the endangered razorback sucker Xyrauchen texanus is particularly vulnerable to predation early in its life history. We compared the escape responses of razorback suckers, which are adapted to the historically warm waters of the Colorado River, with those of rainbow trout Oncorhynchus mykiss, an introduced coldwater species, throughout early development at water temperatures of 12°C and 18°C. We quantified escape performance using maximum velocity, acceleration, and time to maximum velocity and acceleration. Both species showed complete temperature compensation for escape performance; individuals reared at 12°C performed as well as those reared at 18°C. Performance was also similar between species, although two variables exhibited a species X size interaction. Small razorback suckers were faster (greater maximum velocity and acceleration) than small rainbow trout, while large larvae performed similarly. We also determined that razorback sucker larval escape performance falls within the range reported for other fishes. Therefore, we conclude that razorback suckers do not have "poor" escape performance and that temperature does not directly cause decreased performance. However, a cold temperature reduces growth rates and delays razorback suckers' attainment of a "predator- proof" size. Small larvae are also more likely to perform uncoordinated, ineffective escape responses. Hence, razorback sucker performance is indirectly diminished by temperature.
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U2 - 10.1577/T02-069
DO - 10.1577/T02-069
M3 - Article
AN - SCOPUS:0242485371
SN - 0002-8487
VL - 132
SP - 1166
EP - 1178
JO - Transactions of the American Fisheries Society
JF - Transactions of the American Fisheries Society
IS - 6
ER -