...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine ecology progress series >Adaptive mechanism of the bimodal emergence dates in the intertidal midge Pontomyia oceana
【24h】

Adaptive mechanism of the bimodal emergence dates in the intertidal midge Pontomyia oceana

机译：潮间蚊大洋洲双峰出现日期的适应机制

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The intertidal midge Pontomyia oceana (Diptera: Chironomidae) emerges semilunarly, about 15 d apart, in southern Taiwan. Fertilized eggs laid on the same night develop into adults that show emergence peaks about 30 and 45 d later. We tested 2 hypotheses: (1) 'two adaptive peaks'; adult midges emerging in each peak are adapted to certain environments and (2) 'bet-hedging'; late emergence is not adaptive in itself but acts as an insurance against risk of total loss of offspring from a single emergence. In our experiment, the percentage of the cohort that emerged in the first peak had a strong environmental component, but individuals emerging in 2 peaks did not differ in plastic traits such as fecundity, male head length and male thorax length. The 'two adaptive peaks' hypothesis is not supported. Offspring of most individual mothers showed bimodal emergence under homogeneous laboratory conditions. Highly unpredictable wind speed may cause variable success rates of mating on the water surface. By allocating some offspring to a second available window, the midges ensure higher fitness in the long-term in an unpredictable environment. The offspring of some females, nevertheless, only emerged in the first peak. We propose an intermittent bet-hedging strategy in which midges need not produce offspring in both peaks in every generation. As the benefits of bet hedging are only realized over multiple generations, offspring can be distributed in multiple peaks even if offspring do not emerge in 2 peaks in every generation.
机译：台湾南部的潮间带mid蚊海洋动物（双翅目：Chironomidae）以半月形出现，相距约15 d。当天晚上产下的受精卵会发育成成年，成虫在30和45 d后出现出苗高峰。我们测试了2个假设：（1）“两个自适应峰值”；每个高峰出现的成年蚊适应某些环境和（2）“对冲”；晚期出苗本身不是适应性的，而是可以防止由于一次出苗而导致后代完全丧失的风险。在我们的实验中，出现在第一个峰中的同类群的百分比具有很强的环境成分，但是出现在两个峰中的个体在生殖力，雄性头长和雄性胸长等可塑性特征上没有差异。不支持“两个自适应峰值”假设。大多数母亲的后代在均质的实验室条件下显示出双峰出现。高度不可预测的风速可能会导致水面交配的成功率不同。通过在第二个可用窗口中分配一些后代，the可以确保在不可预测的环境中长期保持较高的适应性。但是，某些雌性的后代只出现在第一个高峰期。我们提出了一种间歇性对冲策略，在这种策略中，mid虫不需要在每一代的两个高峰期都产生后代。由于投注套期保值的好处只有几代人才能实现，因此即使后代在每一代中都没有出现在两个峰值中，后代也可以分布在多个峰值中。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号