A5074018303- Fish Ecology and Management Studies
- Fish Biology and Ecology Studies
- Fish biology, ecology, and behavior
- Marine and fisheries research
- Physiological and biochemical adaptations
- Hydrology and Sediment Transport Processes
Archaeology Southwest
2020
University of Arizona
2015
Abstract In the San Juan River, recruitment of early ontogenetic stages federally endangered Razorback Sucker Xyrauchen texanus to subadult or adult is rare. Opercular deformities have been detected in larval and juvenile Suckers River were investigated as an impediment recovery species. Larval (age‐0) native catostomids taken from 1998 2012 examined for presence opercular deformities. The frequency severity compared with Bluehead Catostomus discobolus Flannelmouth latipinnis...
Abstract Grass Carp Ctenopharyngodon idella stocking in the upper Colorado River basin is statutorily limited to triploid, i.e., functionally sterile, individuals. Systematic fish sampling indicates adult remain rare but have been increasing abundance since 2007. larvae collected arm of Lake Powell, about 26 km downstream from inflow, 2015 and 2016, are evidence presence a spawning population. These were first documentation river western United States. While reproductive biology suggests...
Abstract Differences in spawning ecology and early life history may influence the recruitment success of three sympatric catostomids Colorado River basin: Bluehead Sucker Catostomus discobolus , Flannelmouth C. latipinnis federally endangered Razorback Xyrauchen texanus . In San Juan River, all species annually produce larvae, but only suckers regularly recruit to juvenile phase older. Otolith microstructure analysis can determine age, growth rates, periodicity elucidate possible reasons for...
The short larval ontogenetic phase has a large impact on success or failure of fish populations due to naturally high mortality rates. Yet, for the federally endangered fishes Colorado Pikeminnow Ptychocheilus lucius and Razorback Sucker Xyrauchen texanus, information about this sensitive life stage is limited. We determined species-specific age–length functions, spawning periodicity, environmental factors related growth onset by these species in San Juan River basin. Daily ages were from...
Abstract High levels of total suspended sediment (TSS) can have negative consequences on fishes, such as altering food supply, lowering acquisition, clogging gills, and disrupting reproduction. While effects TSS salmonids estuarine fish are well studied, less is known about possible impacts desert fishes. Several imperiled fishes inhabit streams springs near the U.S.–Mexico border potentially threatened by increased loads from borderlands activity livestock grazing, road building, illegal...
Abstract Water diversions worldwide may entrain or impinge fish and have population‐level impacts, but barriers like screens can reduce such threats. Traditional are ineffective in the San Juan River, USA, due to high sediment debris loads, so Hogback Diversion Canal, NM, employs a novel weir wall design entrainment of sub‐adult adult fishes. We evaluated effectiveness reducing larval using combination experimental overnight trials. Larval densities were compared between irrigation canal...
Environmental temperature shapes the ontogeny of ectotherms by influencing rates growth and development which can be key determinants survival. Whereas escalating impacts water management on freshwater ecosystems is well documented, effects cold-water releases from dams-which alter downstream temperatures-remains relatively underexplored but may present novel challenges to endemic ectotherms. Specifically, little known about how thermal depressions reshape phenotypic genetic patterns during...