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Cryptic speciation in the ectocommensal Bdelloura candida (Platyhelminthes, Tricladida, Maricola) follows habitat specialization of the American horseshoe crab, Limulus polyphemus
Invertebrate Biology ( IF 1.2 ) Pub Date : 2020-03-29 , DOI: 10.1111/ivb.12284
Elizabeth L. Roux 1 , Gonzalo Giribet 1
Affiliation  

In strict symbiotic associations, the genetic structure of the symbiont often mirrors that of its host, with interesting implications for population dynamics and phylogeography. An unresolved case of symbiotic specificity and phylogeographic consequence is the relationship between the marine triclad Bdelloura candida and its host, the American horseshoe crab, Limulus polyphemus. A recent study by Riesgo et al. (2017, Marine Biology, 164, 111) identified a strong genetic break between populations of B. candida in the Gulf of Mexico and the Atlantic Ocean but had minimal sampling around the Florida peninsula such that the exact location of the boundary zone was not specified. To solve this, a comprehensive analysis of 16S rRNA and ITS2 genetic markers was conducted from new collections around the Florida peninsula. A clear and significant genetic break was identified between populations of supposed B. candida between Cumberland Island, Georgia, and Mosquito Lagoon, Florida. This genetic break establishes two cryptic lineages, an Atlantic population as far south as Georgia and a Floridian population inclusive of the entire peninsula and Gulf of Mexico, potentially due to niche partitioning of the unique intertidal habitats of its horseshoe crab hosts in Florida. This result directly refutes the previous hypothesis that a population break exists between the coasts of the Atlantic Ocean and Gulf of Mexico, and instead matches the genetic break of its host. Furthermore, a third cryptic lineage was identified in Key West. Overall, this work demonstrates the challenges in maintaining genetic connections between populations of both B. candida and L. polyphemus across their distributions, and poses meaningful implications for both species in the larger context of marine conservation and biodiversity.

中文翻译:

外食念珠菌Bdelloura candida(Platyhelminthes,Tricladida,Maricola)的隐性物种形成遵循美国horse的栖息地专业化

在严格的共生关系中,共生体的遗传结构通常反映其宿主的结构,对种群动态和植物学具有重要意义。共生的特异性和系统地理学后果的悬而未决的情况下,是海洋三层包覆之间的关系Bdelloura念珠菌和其主机,美国鲎,美洲鲎的。Riesgo等人的最新研究。(2017,Marine Biology164,111)确定了念珠菌种群之间的强遗传断裂在墨西哥湾和大西洋,但在佛罗里达半岛附近的采样极少,因此未指定边界区域的确切位置。为了解决这个问题,从佛罗里达半岛附近的新馆藏中对16S rRNA和ITS2遗传标记进行了综合分析。在假定的念珠菌种群之间鉴定出明显且重要的遗传断裂位于乔治亚州坎伯兰岛和佛罗里达蚊子泻湖之间。这种遗传断裂建立了两个隐秘谱系,一个大西洋种群一直到佐治亚州南部,一个佛罗里达种群包括整个半岛和墨西哥湾,这可能是由于其Florida马寄主在佛罗里达州独特的潮间生境的生态位划分所致。该结果直接驳斥了先前的假设,即大西洋和墨西哥湾海岸之间存在种群断裂,而是与其宿主的遗传断裂相匹配。此外,在基韦斯特发现了第三个隐秘谱系。总的来说,这项工作证明了在维持念珠菌和多菌乳杆菌种群之间的遗传联系方面面临的挑战 跨物种分布,在更大范围的海洋保护和生物多样性背景下,对这两个物种都产生了有意义的影响。
更新日期:2020-03-29
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