热和冷波降低了寄生虫黄蜂Cotesia typhae (Hymenoptera,Braconidae) 的精子产量和偏差性别比率
Christophe Bressac1, Ahmed El Sabrout2, Fatma Kifouche1
1IRBI, UMR 7261 CNRS, Institut de Recherche sur la Biologie de l'Insecte, Faculté des Sciences et Techniques, Université de Tours, Tours, France.
Journal of insect physiology
|August 11, 2023
概括
在发育过程中,温度压力显著降低了寄生虫黄蜂 (Cotesia typhae) 的精子数量,导致后代数量减少和男性偏向的性别比率. 这影响了生物控制应用和过冬生存.
科学领域:
- 昆虫学 昆虫学是一门学科.
- 昆虫的生殖生物学 昆虫的生殖生物学
- 害虫管理 害虫管理 害虫管理
背景情况:
- 寄生虫黄蜂是双倍体,后代的性别比例取决于精子的可用性.
- 男性寄生虫黄蜂在幼阶段对温度压力敏感,影响生育能力.
- 型虫是入侵性害虫Sesamia nonagrioides的天然敌人.
研究的目的:
- 调查温度压力对Cotesia typhae.的精子生产和后代性别比率的影响.
- 为了确定热和冷应激对男性寄生虫生育能力的影响.
- 评估温度压力对C. typhae.生物控制潜力的影响.
主要方法:
- 在受控实验中,在幼阶段,C. typhae雄性暴露在不同温度 (热度:34-36°C,冷度:0-10°C) 中.
- 在七天内测量成年男性的精子产量.
- 评估与温度压力雄性交配后的雌性精子储存和后代性别比率.
主要成果:
- 在对照条件下 (25-27°C) 的第三天,精子产量稳定下来,达到每名男性的25,000个精子.
- 在短时间暴露后,热 (34-36°C) 和冷 (0-10°C) 压力显著降低了精子生产.
- 与温度压力男性交配的雌性储存的精子较少,产生的女儿较少,并导致男性偏向的后代性别比率.
结论:
- 在幼阶段的温度压力会对C. typhae雄性生育能力和后代的性别比例产生负面影响.
- 这些发现表明,冬季生存率降低,并对C. typhae作为欧洲生物控制剂的建立构成潜在挑战.
- 优化温度管理对于C. typhae在生物控制计划中的运输,储存和应用至关重要.
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