Effect of diazinon on life stages and resting egg hatchability of rotifer Brachionus plicatilis
スポンサーリンク
概要
- 論文の詳細を見る
The effects of organophosphate pesticide, diazinon, on life history parameters and hatchability of resting eggs of rotifer Brachionus plicalitis were assessed. Newly hatched (<1h-old) neonates were individually cultured in six varying concentrations (0/control, 0.1, 1.0, 2.5, 5.0 and 10.0 mg/L) of diazinon. The life history parameters such as time (h) the rotifers bear first egg and release first neonate, reproductive period, net reproductive rate, mixis, intrinsic rate of population increase, and life span were evaluated. Results showed that among the life history parameters, the time the rotifers took to release neonates is the most sensitive, giving the lowest EC50 value of 1.24 mg/L. The fecundity of maternal females, amictic and mictic daughters was also investigated. Rotifers exposed to 10.0 mg/L produced significantly fewer amictic daughters, and at this concentration, rotifers did not produce any mictic daughter. At 5.0 mg/L, the number of male offspring was significantly lower than the control. Furthermore, the hatchability of resting eggs produced by the rotifers was evaluated when exposed to diazinon: from birth until they produced resting eggs (early development); during late developmental stage of resting eggs (before diapause); and during diapausing stage. The hatchability of the resting eggs was not affected when exposure was timed at late developmental and diapausing stages. Overall results showed that even though amictic females reproduced normally in the presence of low concentration of diazinon, sexual reproduction is severely affected, especially the hatchability of resting eggs when the exposure was timed on its early developmental stages. This provides another evidence that production of resting eggs is particularly sensitive to the presence of xenobiotics in the environment.
論文 | ランダム
- 土木の風景 新湊川トンネル 神戸市--大震災を機に再評価されたレンガ造のトンネルを保存
- 土木遺産再発見(44)手掘りトンネルと工人の里--新潟県・中山隧道
- 蒸気機関車運転室(キャブ)内労働衛生調査と事故防止対策 : 狩勝トンネル争議
- サイニュース 56年間、ひっそりと私たちを見つめてきた隧道--鳥取県倉吉市における戦中戦後の、ある歴史事実
- 加藤先生からの教え (加藤裕一教授退職記念号)