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首页> 外文期刊>Marine ecology >The role of floating mucilage in the invasive spread of the benthic microalga Chrysophaeum taylorii
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The role of floating mucilage in the invasive spread of the benthic microalga Chrysophaeum taylorii

机译：漂浮黏液在底栖微藻泰氏藻侵袭性扩散中的作用

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Chrysophaeum taylorii Lewis & Bryan (Pelagophyceae) is a mucilage-producing benthic microalga that has recently begun to spread in the Mediterranean Sea, where a range expansion is occurring. This paper presents the results of three field experiments that aimed to increase the knowledge on mucilage provision mechanisms for this benthic microalga and to evaluate the importance of mucilage in its range expansion. By means of two correlative field experiments (several years of data were considered to encompass the variability of mucilage cover) we found that, on the sea bottom, mucilage cover does not depend on epilithic cell density and that both its cover and settling are affected by water flow. We also tested the hypothesis that cells embedded in floating mucilage fall on the underlying substratum, where their abundance depends on water flow. To this aim, in the field we manipulated the presence of floating mucilaginous aggregates in cages with different levels of exposure to winds. The abundance of C.taylorii cells on the substratum under cages with mucilage was compared with that of two control treatments: cages without mucilage and mucilage in still water, in the field and lab, respectively. The results suggested that mucilage can represent an excellent strategy for the species to disperse, as C.taylorii cells fall from the floating mucilage and, if the water flow is unimportant, settle on hard substrata just underneath the cage. This study enriches the portfolio of knowledge of the dispersal strategies of microalgae and contributes to the understanding of the spread of invasive species.
机译：Chrysophaeum taylorii Lewis＆Bryan（Pelagophyceae）是一种产生粘液的底栖微藻，最近在地中海范围内开始扩散，在那里范围不断扩大。本文介绍了三个野外实验的结果，旨在增加对这种底栖微藻的黏液提供机制的了解，并评估黏液在其范围扩展中的重要性。通过两个相关的现场实验（几年的数据被认为涵盖了粘液覆盖的变化），我们发现，在海底，粘液覆盖不依赖于上石细胞密度，并且其覆盖和沉降都受到水流。我们还检验了以下假设：嵌入悬浮液中的细胞落在下面的基质上，在该基质下，细胞的丰度取决于水的流量。为了达到这个目的，我们在野外处理了不同风向的笼子中漂浮的粘多糖聚集体的存在。在有粘液的网箱下，将粘液笼罩下的泰勒梭菌细胞的丰度与两种对照处理方法进行了比较：分别在田间和实验室中，无粘液的网箱和静水中的粘液。结果表明，黏液可以代表一种很好的物种扩散策略，因为泰氏梭状芽胞杆菌细胞会从漂浮的黏液中掉落，如果水流不重要，则应将其固定在笼子下面的坚硬基质上。这项研究丰富了微藻扩散策略的知识组合，并有助于了解入侵物种的扩散。

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