Microbial biogeography through the lens of exotic species: The recent introduction and spread of the freshwater diatom Discostella asterocostata in the United States
Microbial biogeography through the lens of exotic species: The recent introduction and spread of the freshwater diatom Discostella asterocostata in the United States
复制标题
外来物种视角下的微生物生物地理学：淡水硅藻 Discostella asterocostata 最近在美国的引入和传播
DOI：
10.1007/s10530-021-02497-5
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发表时间：
2021
影响因子：
2.9
通讯作者：
Yeager, Kevin M.
中科院分区：
文献类型：
--
作者：
Alverson, Andrew J.;Chafin, Tyler K.;Jones, Kiley A.;Manoylov, Kalina M.;Johnson, Hillary;Julius, Matthew L.;Nakov, Teofil;Ruck, Elizabeth C.;Theriot, Edward C.;Yeager, Kevin M.
微生物的大种群规模和高扩散潜力表明，在世界范围内所有合适的栖息地都应该找到特定的微生物物种。因此，微生物不应该表现出在大型有机体中看到的那种微生物学模式。这种模式受到越来越多的外来微生物的挑战，这些外来微生物具有地理分离，而不是促进微生物的分散，因为它们本身是有限的。我们对美国的水体进行了采样，并从文献和公共数据库中收集了记录，以描述淡水浮游硅藻Discostella asterocostata（Xie，Lin和Cai）Houk和Klee.Discostella asterocostatawas被认为仅限于远东地区，但我们报告了其在美国东部生态相似的水体中的存在。来自美国和中国的种群在形态上无法区分，这表明它们可能是最近分离的--这一假设得到了古湖泊学数据的支持，这些数据支持D.就在上世纪80年代中期，D. asterocostataand入侵鲤鱼物种，在其本地和非本地的范围，强调亚洲鲤鱼作为一个可能的载体引入硅藻在美国的外来硅藻的存在强调了微生物扩散的自然约束，导致在地理分布，可以通过人类活动颠覆。
The large population sizes and high dispersal potential of microbes suggests that a given microbial species should be found in all suitable habitats worldwide. Consequently, microbes should not exhibit the kinds of biogeographic patterns seen in macroorganisms. This paradigm is challenged by a growing list of exotic microbes with biogeographic disjunctions that instead promotes microbial dispersal as inherently limited. We sampled water bodies in the United States and compiled records from the literature and public databases to characterize the distribution of the freshwater planktonic diatom,Discostella asterocostata(Xie, Lin, and Cai) Houk and Klee.Discostella asterocostatawas thought to be restricted to the Far East, but we report its presence in ecologically similar water bodies across the eastern United States. Populations from the U.S. and China are indistinguishable morphometrically, suggesting they may be recently separated—a hypothesis supported by paleolimnological data, which support an introduction ofD. asterocostatainto the U.S. as recently as the mid-1980s. The overlapping distributions ofD. asterocostataand invasive carp species, in both their native and nonnative ranges, highlighted Asian carp as a possible vector for introduction of the diatom in the U.S. The existence of exotic diatoms underscores natural constraints on microbial dispersal, resulting in biogeographic distributions that can be upended through human activity.