DYNAMICS OF PREGNANCY CYCLE IN TSETSE GLOSSINA-MORSITANS
DYNAMICS OF PREGNANCY CYCLE IN TSETSE GLOSSINA-MORSITANS
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DOI：
10.1016/0022-1910(74)90143-7
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发表时间：
1974-01-01
影响因子：
2.2
通讯作者：
MA, WC
中科院分区：
文献类型：
--
作者：
DENLINGER, DL;MA, WC
采采蝇的正常妊娠包括幼虫发育与母体活动的成功整合。在25 ℃条件下，桑尺蠖在前一次产卵后1小时开始排卵，卵在第3.8天孵化（长1.57mm，干重0.09mg），蜕皮至二龄的时间为4.9天（2.3 mm，0.30 mg），三龄角质层形成时间为6.8天（4.5 mm，5.0 mg），分娩时间为9.0天（6.0 mm，10.0 mg）。在2天的时间里，子宫三龄幼虫的黑化遵循一个有规律的顺序。分娩遵循昼夜节律模式，在光照后9小时达到高峰（每天12小时）。所有的幼虫都从雌性的乳汁腺中获得营养。在妊娠早期，乳汁的合成速率大于幼虫的吸收速率，从而导致分泌库的扩张。在第6天之后，分泌库的体积减小，但是如核体积和幼虫生长所示，合成速率保持高直到第8天。成年雌性的摄食活动在第1天达到最大，到第6天稳定在60%，然后在怀孕结束时急剧下降。卵母细胞的发育与幼虫的发育同步进行，从而使连续怀孕之间的滞后期最小化。
A normal pregnancy in tsetse involves the successful integration of larval development with maternal activity. At 25°C, ovulation inGlossina morsitansoccurs 1 hr after the previous larviposition, the egg hatches on day 3·8 (1·57 mm length, 0·09 mg dry wt.), ecdysis to second instar occurs on day 4·9 (2·3 mm, 0·30 mg), the third instar cuticle is formed on day 6·8 (4·5 mm, 5·0 mg), and parturition occurs on day 9·0 (6·0 mm, 10·0 mg). Melanization of thein uterothird instar follows a regular sequence over a 2 day period. Parturition follows a circadian pattern with a peak 9 hr after lights on (12 hr daily photophase). All instars receive nutriment from the female's milk gland. During early pregnancy the rate of milk synthesis is greater than rate of uptake by the larva, thus causing expansion of the secretory reservoirs. After day 6, the volume of the secretory reservoirs decreases, but as is indicated by nuclear volume and larval growth the rate of synthesis remains high until day 8. Feeding activity of the adult female is maximal on day 1, levels off at 60 per cent up to day 6, and then declines sharply towards the end of pregnancy. Oöcyte development proceeds in phase with larval development and thus minimizes a lag period between successive pregnancies.