Effect of salinity during resting egg formation and hatching on descendent reproduction in the rotifer Brachionus rotundiformis Tschugunoff
スポンサーリンク
概要
- 論文の詳細を見る
This study investigated the effect of salinity experienced during resting egg formation and hatching on the descendents reproduction and on resting egg hatching in the monogonont rotifer Brachionus rotundiformis Tschugunoff. The study was divided into two parts. First, the resting eggs formed at 17 psu were incubated at four salinities (8, 11, 22 and 33 psu) and then the hatchlings were cultured at the same salinities as during incubation. Second, the resting eggs formed at the four salinities were incubated at the same salinities as during their formation, and the hatchlings were cultured at 33 psu. The resting eggs formed at a salinity of 17 psu and incubated at four different salinities showed a higher hatching percentage at lower salinities (8 and 11 psu). When resting eggs were incubated at the same salinities as at formation (8, 11, 22 and 33 psu), the eggs showed no significant differences in a total hatching rate among treatments (83.386.7). There was no significant difference in population growth when hatchlings did not experience a change in salinity. However, the population growth of hatchlings at 8 psu was comparatively arrested and at 33 psu caused by the acute increase in salinity. With regard to sexual reproduction, rotifers showed different patterns that were associated with the salinity experienced during resting egg hatching. This study shows that the salinity experienced during resting egg formation is the optimal one for egg hatching. Moreover, the salinity experienced during resting egg hatching strongly affects the descendents sexual reproduction more than the salinity experienced during egg formation.
- 2011-06-07
論文 | ランダム
- 県段階の共闘組織の活動--大阪 農業振興に果たす運動組織の役割--広島県北を訪ねて (広がりみせた農業を守る運動--「農業危機打開・農民経営擁護農民運動第2回全国交流集会」から) -- (全体集会の発言から)
- 広島県北での生産団体・運動組織のとりくみ--力あわせ農業振興へたしかな歩み
- 革新府政を支え革新府政に支えられる大阪の農業と農民
- 地域ぐるみの集団転作と互助制度--兵庫・日高町の国府転作組合(新しい農地利用への動き)
- 黒田革新府政と大阪の農業-4-都市農業に野菜価格安定制度をいかす