新热带豆娘的新孵化线索:幼虫适应和母体约束

IF 1 4区 农林科学 Q3 ENTOMOLOGY International Journal of Odonatology Pub Date : 2023-11-08 DOI:10.48156/1388.2023.1917223
Arjèn E. van’t Hof, Ola M. Fincke
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引用次数: 0

摘要

同胞同类相食作为一种母性策略的进化尤其难以解释,尤其是当托儿所由多名女性共享时。这就是豆娘(Megaloprepus caerulatus)的情况,它的雌性在水线以上的树皮上产卵,在充满水的大树洞里产卵。不同步孵化似乎是一种母亲的对冲策略,以增加同类相食的后代在机会之窗孵化的机会,这发生在剩余的大型幼虫出现后,吃掉了所有其他的幼虫。我们调查了异步孵化的近似原因。通过对环境温度下虫卵孵化模式的监测,发现虫卵孵化与环境温度的降低同时发生,随降雨量的增加而降低。将完全发育的鸡蛋放在较低的温度下处理两个小时,相对于环境温度下的对照组,孵化率会增加。分离控制离合器表明兄弟姐妹的胚胎发育是异步的。结果表明,孵化触发器是自适应的。降雨保证了幼虫栖息地的水分补给,并为树皮上的新生儿活动提供了必要的潮湿条件。在4天的干燥处理中,只有40%的新生儿存活;经过8天和14天的治疗,无一存活。这种新型的孵化触发机制会增加雨后进入孵卵室的幼崽数量,限制了母亲对卵孵化时间的控制,同时增加了亲缘和非亲缘后代之间对共享孵卵室有限机会窗口的竞争。
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Novel hatching cue in the neotropical damselfly Megaloprepus caerulatus: larval adaptation and maternal constraint
The evolution of sibling cannibalism as a maternal strategy is particularly challenging to explain when nurseries are shared among multiple females. Such is the case for the damselfly, Megaloprepus caerulatus, whose females lay eggs in bark above the water line in large, water-filled tree holes. Asynchronous egg hatching appears to be a maternal bet-hedging strategy to increase the chances that cannibalistic offspring hatch during windows of opportunity, which occur after the remaining large larvae emerge, having eaten all others. We investigated the proximate causes of asynchronous hatching. By monitoring the pattern of egg hatching under ambient temperature in an insectary, we found that egg hatching co-occurred with lower ambient temperatures, which decreased with increasing rainfall. Treating fully developed eggs to a lower temperature for two hours triggered increased hatching relative to controls at ambient temperature. Dissection of control clutches indicated that embryonic development of siblings was asynchronous. Results suggested that the hatching trigger is adaptive. Rainfall assures a recharge of the larval habitat with water and provides wet conditions essential for neonate mobility on bark. Only 40% of neonates in a 4-day drying treatment survived; none survived the 8- and 14-day treatments. This novel hatching trigger should increase the number of neonates entering the nursery after rains, constraining a mother’s control over the timing of egg hatch, while increasing the competition among related and unrelated offspring for limited windows of opportunity in the shared nursery.
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来源期刊
CiteScore
2.30
自引率
0.00%
发文量
15
审稿时长
>12 weeks
期刊介绍: International Journal of Odonatology (IJO) is aimed at providing a publication outlet for the growing number of students of Odonata. It will address subjects such as the ecology, ethology, physiology, genetics, taxonomy, phylogeny and geographic distribution of species. Reviews will be by invitation, but authors who plan to write a review on a subject of interest to the journal are encouraged to contact the editor.
期刊最新文献
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