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Egg morphology may underpin the successful distribution of large branchiopods in temporary waters
Aquatic Ecology ( IF 1.7 ) Pub Date : 2021-01-09 , DOI: 10.1007/s10452-020-09826-1
Elizabeth Meyer-Milne , Luc Brendonck , Tom Pinceel

Invertebrate species from temporary aquatic ecosystems produce resistant dormant stages (i.e. eggs) that accumulate in long lived mixed egg banks in the sediment. These dormant eggs not only bridge dry phases but also act as propagules for passive dispersal. Large branchiopod crustaceans (e.g. Notostraca, Anostraca and Spinicaudata) produce dormant eggs of variable shapes, sizes and external ornamentation. While these characteristics are often species-specific and have been used in taxonomy, little is known about their ecological significance, for example, their contribution to colonisation success. Here, we explore the idea that variation in egg morphology may impact vector-mediated dispersal and colonisation success of large branchiopods. We studied egg banks from 98 temporary waters across the Northern Cape, South Africa and assessed whether distribution and densities of eggs carried a morphological signal. Overall, our results imply that both size and external structures may impact dispersal to and successful colonisation of temporary waters by large branchiopods. Specifically, our results show that small propagules (< 200 µm) and eggs with external traits (hooks or spines) that facilitate substrate adhesion were most confined in their distribution. In contrast, large (> 400 µm), smooth eggs and medium sized (200–300 µm), polygonal eggs were most widely distributed. Ultimately, our approach provides insight in actual colonisation success of species with different egg types and not only on the propensity of the eggs to be picked up and transported by vectors.



中文翻译:

卵的形态可能是暂时性水域中大分支脚类动物成功分布的基础

来自临时水生生态系统的无脊椎动物产生抗性的休眠阶段(即卵),这些阶段积累在沉积物中长寿命的混合卵库中。这些休眠的卵不仅桥接干燥相,而且还充当被动扩散的繁殖体。大型的分枝甲壳类甲壳动物(如Notostraca,Anostraca和Spinicaudata)可产生形状,大小和外部装饰各异的休眠卵。尽管这些特征通常是特定于物种的,并已用于分类学,但对其生态意义(例如,它们对成功定殖的贡献)知之甚少。在这里,我们探讨了鸡蛋形态的变化可能影响载体介导的大分支脚类动物的扩散和定殖成功的想法。我们研究了北开普省98个临时水域的卵库,南非并评估了卵的分布和密度是否携带形态信号。总体而言,我们的结果表明,大小和外部结构都可能影响大分枝足类对临时水域的扩散和成功定殖。具体而言,我们的结果表明,小的繁殖体(<200 µm)和具有有助于基质粘附的外部性状(钩或刺)的卵分布范围最狭窄。相反,大型(> 400 µm),光滑的卵和中等大小(200–300 µm)的多边形卵分布最广。最终,我们的方法提供了洞察力,以了解具有不同卵类型的物种在实际定殖中的成功,而不仅是通过载体采集和运输卵的倾向。我们的研究结果表明,大小和外部结构都可能影响大分枝足类对临时水域的扩散和成功定殖。具体而言,我们的结果表明,小的繁殖体(<200 µm)和具有有助于基质粘附的外部性状(钩或刺)的卵分布范围最狭窄。相反,大型(> 400 µm),光滑的卵和中等大小(200–300 µm)的多边形卵分布最广。最终,我们的方法提供了洞察力,以了解具有不同卵类型的物种在实际定殖中的成功,而不仅是通过载体采集和运输卵的倾向。我们的研究结果表明,大小和外部结构都可能影响大分枝足类对临时水域的扩散和成功定殖。具体而言,我们的结果表明,小的繁殖体(<200 µm)和具有有助于基质粘附的外部性状(钩或刺)的卵分布范围最狭窄。相反,大型(> 400 µm),光滑的卵和中等大小(200–300 µm)的多边形卵分布最广。最终,我们的方法提供了洞察力,以了解具有不同卵类型的物种在实际定殖中的成功,而不仅是通过载体采集和运输卵的倾向。200 µm)和具有有助于基质粘附的外部特性(钩或刺)的卵分布范围最狭窄。相反,大型(> 400 µm),光滑的卵和中等大小(200–300 µm)的多边形卵分布最广。最终,我们的方法提供了洞察力,以了解具有不同卵类型的物种在实际定殖中的成功,而不仅是通过载体采集和运输卵的倾向。200 µm)和具有有助于基质粘附的外部特性(钩或刺)的卵分布范围最狭窄。相反,大型(> 400 µm),光滑的卵和中等大小(200–300 µm)的多边形卵分布最广。最终,我们的方法提供了洞察力,以了解具有不同卵类型的物种在实际定殖中的成功,而不仅是通过载体采集和运输卵的倾向。

更新日期:2021-01-10
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