(DOWNLOAD) "Effects of Insecticide (Carbaryl) Exposure on Activity and Swimming Performance of Tadpoles of the Rio Grande Leopard Frog, Rana Berlandieri (Anura: Ranidae)." by The Texas Journal of Science * eBook PDF Kindle ePub Free
eBook details
- Title: Effects of Insecticide (Carbaryl) Exposure on Activity and Swimming Performance of Tadpoles of the Rio Grande Leopard Frog, Rana Berlandieri (Anura: Ranidae).
- Author : The Texas Journal of Science
- Release Date : January 01, 2005
- Genre: Engineering,Books,Professional & Technical,
- Pages : * pages
- Size : 209 KB
Description
Abstract. -- Experiments were conducted to assess the effects of the insecticide carbaryl on proportion of time spent in activity (tail movement) and swimming speed of tadpoles of the Rio Grande Leopard Frog, Rana berlandieri. Tadpoles were exposed (0 to 96 h) to various concentrations of carbaryl (3.5, 5.0 or 7.5 mg/L), or to an acetone solvent control, or water control. No significant differences in behavior were observed between tadpoles of either control group. Time spent in activity and swimming speed decreased significantly at all concentrations of carbaryl after 24 h exposure, and this effect was most pronounced at 7.5 mg/L. Full recovery of time spent in activity was observed for tadpoles exposed to 3.5 mg/L carbaryl when tested at 48 h post-exposure. Tadpoles exposed to 5.0 mg/L recovered to a lesser extent and exhibited activity levels of approximately 52% of those exhibited by controls, and tadpoles exposed to 7.5 mg/L carbaryl showed no recovery at 48 h post-exposure. Swimming speed decreased significantly for tadpoles exposed to 3.5 mg/L carbaryl after 48 h exposure, whereas exposure to 5.0 mg/L resulted in a significant reduction after only 24 h. In tadpoles, swimming speed is important for carrying out certain life history functions such as growth and development. A decrease in swimming speed may result in higher predation rates (increased mortality), as well as slower growth rates thereby increasing the amount of time required to complete metamorphosis. Exposure to pesticides must be considered when analyzing possible causes of amphibian declines. **********
 "Effects of Insecticide (Carbaryl) Exposure on Activity and Swimming Performance of Tadpoles of the Rio Grande Leopard Frog, Rana Berlandieri (Anura: Ranidae)." by The Texas Journal of Science * eBook PDF Kindle ePub Free){kind=link}