Scholarlink

<p>This study examined whether eggs within a single pod of <i>Locusta migratoria</i> Linnaeus (Orthoptera: Acrididae) develop at different rates under natural conditions and how synchronized hatching is achieved despite such variation. Laboratory observations indicated that females laid eggs 3–7&#xa0;cm below the sand surface. When post-diapause eggs were buried in soil for 10&#xa0;days in spring and then incubated at 30&#xa0;°C, those that had been deposited at 3&#xa0;cm hatched approximately 20&#xa0;h earlier than those at 7&#xa0;cm, although the mean soil temperatures did not differ significantly between depths. The greater thermal amplitude in the shallower layer is therefore likely to have accelerated development, suggesting that temperature fluctuations, rather than mean temperature alone, contribute to developmental differences among eggs in the field. Laboratory experiments confirmed that development under fluctuating-temperature regimes (20/25–35&#xa0;°C) proceeded significantly faster than predicted by a linear degree-day model based on a threshold of 16.4&#xa0;°C. This conclusion was further supported by another experiment in which daily degree-days were identical but the amplitude of temperature fluctuation differed. In addition, hatching synchrony markedly increased when eggs from 3 and 7&#xa0;cm soil depths were kept in contact, providing direct evidence that embryo–embryo communication can synchronize hatching within a pod. These findings demonstrate that locust eggs experience distinct microthermal environments within their pods, respond developmentally to temperature fluctuations, and nevertheless achieve synchronous hatching through interembryonic signaling. Incorporating the effects of temperature fluctuations on development will improve the accuracy of developmental models under natural temperature variation.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effects of different soil depths on hatching time and synchrony in Locusta migratoria (Orthoptera: Acrididae) egg pods: importance of responses to fluctuating temperature and embryo–embryo communication

  • 期刊论文

  • 发表日期：

    2026年5月19日

查看全文
  • Seiji Tanaka

摘要

This study examined whether eggs within a single pod of Locusta migratoria Linnaeus (Orthoptera: Acrididae) develop at different rates under natural conditions and how synchronized hatching is achieved despite such variation. Laboratory observations indicated that females laid eggs 3–7 cm below the sand surface. When post-diapause eggs were buried in soil for 10 days in spring and then incubated at 30 °C, those that had been deposited at 3 cm hatched approximately 20 h earlier than those at 7 cm, although the mean soil temperatures did not differ significantly between depths. The greater thermal amplitude in the shallower layer is therefore likely to have accelerated development, suggesting that temperature fluctuations, rather than mean temperature alone, contribute to developmental differences among eggs in the field. Laboratory experiments confirmed that development under fluctuating-temperature regimes (20/25–35 °C) proceeded significantly faster than predicted by a linear degree-day model based on a threshold of 16.4 °C. This conclusion was further supported by another experiment in which daily degree-days were identical but the amplitude of temperature fluctuation differed. In addition, hatching synchrony markedly increased when eggs from 3 and 7 cm soil depths were kept in contact, providing direct evidence that embryo–embryo communication can synchronize hatching within a pod. These findings demonstrate that locust eggs experience distinct microthermal environments within their pods, respond developmentally to temperature fluctuations, and nevertheless achieve synchronous hatching through interembryonic signaling. Incorporating the effects of temperature fluctuations on development will improve the accuracy of developmental models under natural temperature variation.