Selenium impacts on razorback sucker, Colorado: Colorado River III. Larvae.
Razorback sucker (Xyrauchen texanus) larvae from adults exposed to selenium at three sites near Grand Junction, Colorado, for 9 months were used in a 30-day waterborne and dietary selenium study. Selenium concentrations in water averaged <1.6 microg/L from 24-Road, 0.9 microg/L from Horsethief, 5.5 microg/L from Adobe Creek, and 10.7 microg/L from the North Pond. Selenium in dietary items averaged 2.7 microg/g in brine shrimp, 5.6 microg/g in zooplankton from Horsethief east wetland, 20 microg/g in zooplankton from Adobe Creek, and 39 microg/g in zooplankton from North Pond. The lowest survival occurred in larvae fed zooplankton rather than brine shrimp. Survival of larvae at Adobe Creek and North Pond was lower in site water than in reference water. Survival of brood stock larvae was higher than Horsethief larvae even though they received the same water and dietary treatments. Arsenic concentrations in brine shrimp may have resulted in an antagonistic interaction with selenium and reduced adverse effects in larvae. Deformities in larvae from North Pond were similar to those reported for selenium-induced teratogenic deformities in other fish species. Selenium concentrations of 4.6 microg/g in food resulted in rapid mortality of larvae from Horsethief, Adobe Creek, and North Pond, and suggested that selenium toxicity in the Colorado River could limit recovery of this endangered fish.
Hamilton
Steven J
SJ
US Geological Survey, Columbia Environmental Research Center, Field Research Station, 31247 436th Avenue, Yankton, SD 57078-6364, USA.
Holley
Kathy M
KM
Buhl
Kevin J
KJ
Bullard
Fern A
FA
D000014:Abnormalities, Drug-Induced; D000818:Animals; D001151:Arsenic / Q000032:analysis; D003120:Colorado; D003531:Cypriniformes / Q000002:abnormalities / Q000254:growth & development / Q000378:metabolism; D004032:Diet; D004305:Dose-Response Relationship, Drug; D004347:Drug Interactions; D005260:Female; D020387:Food Chain; D007814:Larva / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism; D008136:Longevity / Q000187:drug effects; D008297:Male; D045483:Rivers; D012643:Selenium / Q000032:analysis / Q000493:pharmacokinetics / Q000633:toxicity*; D016019:Survival Analysis; D014018:Tissue Distribution; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000493:pharmacokinetics / Q000633:toxicity*; D015048:Zooplankton / Q000737:chemistry / Q000378:metabolism
D014874:Water Pollutants, Chemical; D012643:Selenium; D001151:Arsenic