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首页> 外文期刊>Permafrost and periglacial processes >The life history of Serratella ignita (Poda, 1761) (Insecta: Ephemeroptera) in a temporary and permanent Mediterranean stream
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The life history of Serratella ignita (Poda, 1761) (Insecta: Ephemeroptera) in a temporary and permanent Mediterranean stream

机译：在暂时的和永久的地中海河流中，Serratella ignita（Poda，1761）（Insecta：Ephemeroptera）的生活史

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In mid latitudes, such as the Mediterranean region, one consequence of global climate change will be a progressive shift of permanent to temporary water courses, altering the life histories of present species or making them disappear. Presented here is a study on the life history of a mayfly species, Serratella ignita, in two Mediterranean streams, one permanent and one temporary. The research focuses on life history parameters such as life cycle, nymphal growth pattern, feeding type, biomass and secondary production. The life cycle was univoltine, showing a fast seasonal nymphal growth during four months in the permanent stream and five months in the temporary stream, with a long egg stage with diapause. The cumulated day-degrees during nymphal growth werernsimilar between streams. Both populations behaved mainly as gatherer-collectors, but the population from the temporary stream also played an important role as a scraper. Animal matter was also consumed by nymphs from both populations. Gut content analysis showed that both 5. ignita populations were oppor-tunist/generalists, where changes in diet were correlated with size. Biomass and secondary production were notably higher in the permanent stream, but they were also high in the temporary stream. These data show that 5. ignita had a high fitness in both streams. Our results support the idea that species such as this one may cope with future global climate change by maintaining, or even increasing, their populations at the expense of more stenoecic species.
机译：在地中海地区等中纬度地区，全球气候变化的一个后果将是永久性水道逐渐过渡到临时水道，从而改变了现有物种的生活史或使其消失。这里介绍的是一项关于褐飞鱼Serratella ignita在两个地中海小溪，一个永久性和一个临时性中的生活史的研究。该研究着重于生命史参数，例如生命周期，若虫的生长方式，摄食类型，生物量和次级生产。生命周期是单伏伏伏特，在永久流中四个月和临时流中五个月显示出快速的季节性若虫生长，卵期较长，有滞育现象。若虫生长期间的累积日度在溪流之间是相似的。两种种群的行为主要表现为收集者-收集者，但临时河流中的种群也扮演着重要的角色。这两个种群的若虫也消耗了动物物质。内脏含量分析表明，这两个火鸡种群都是optun-tunist / generalists，饮食的变化与大小相关。永久性河流中的生物量和二级生产量明显较高，但临时性河流中的生物量和二级生产量也较高。这些数据表明5. ignita在两个流中都具有很高的适应性。我们的结果支持这样的想法，即这种物种可以通过维持或什至增加其种群数量而牺牲更多的狭窄物种来应对未来的全球气候变化。

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