MEDITERRANEAN CAULERPA TAXIFOLIA AND C. MEXICANA (CHLOROPHYTA) ARE NOT CONSPECIFIC
MEDITERRANEAN CAULERPA TAXIFOLIA AND C. MEXICANA (CHLOROPHYTA) ARE NOT CONSPECIFIC
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地中海 Caulerpa TAXIFOLIA 和 C. MEXICANA（绿藻）不是同种植物
DOI：
10.1046/j.1529-8817.1998.340850.x
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
W. Stam
中科院分区：
文献类型：
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作者：
J. Olsen;M. Valero;I. Meusnier;S. Boele;W. Stam
1984年，杉叶蕨藻Caulerpa taxifolia（Vahl）C.据报道，阿加德沿着摩纳哥海岸。在过去十年中，它已沿沿着60公里的地中海海岸线蔓延，目前对生物多样性构成潜在威胁。关于C.在地中海的taxifolia。一种假说认为，这种鱼是在摩纳哥偶然被引入大海的，在那里它被用作水族馆的装饰性鱼。杉叶蕨藻（Caulerpa taxifolia）在地中海早期的海洋植物区系中没有报道，它的突然出现表明它可能是最近引进的。另一种假说认为C. taxifolia和Caulerpa mexicana Sonder ex Kützing是彼此的形态变体，因此是同种分类群。墨西哥蕨藻（Caulerpa mexicana）至少从1941年起就在地中海东部被发现。为了建立这些分类群的分类身份，从五个居群的C。taxifolia和四个种群的C. mexicana是从地中海内外收集的。核核糖体顺反子的比较DNA序列分析，包括18 S，ITS 1，5.8S和ITS 2区域的3′-末端，使用简约和最大似然分析显示两个分类群的系统发育分离。无论分析仅基于更保守的18 S数据还是仅基于快速演变的间隔区，都保持分离。因此，这两个物种不是同种的。对于身份不确定的标本（即墨西哥杉中间体），可以很容易地进行PCR诊断扩增，因为C. taxifolia比C.墨西哥人。无论是否C。taxifolia在海洋植物群中存在了较长的时间，无论是作为一个神秘的特有种，还是作为一个或多个引进的结果，都代表了一个额外的假设，需要从世界各地鉴定地理种群，以及地中海地区的种群水平研究。
In 1984, Caulerpa taxifolia (Vahl) C. Agardh was reported along the coast of Monaco. Over the past decade it has spread along 60 km of the Mediterranean coastline and presently represents a potential risk to biodiversity. Several explanations have been advanced regarding the presence of C. taxifolia in the Mediterranean. One hypothesis maintains that the alga was introduced accidentally into the sea at Monaco, where it has been used as a decorative alga in aquaria. Caulerpa taxifolia has not been reported in earlier marine floras of the Mediterranean, and its sudden appearance has suggested that it may be a recent introduction. Another hypothesis proposes that C. taxifolia and Caulerpa mexicana Sonder ex Kützing are morphological variants of one another and hence conspecific taxa. Caulerpa mexicana has been found in the eastern Mediterranean since at least 1941. In order to establish the taxonomic identities of these taxa, individuals from five populations of C. taxifolia and four populations of C. mexicana were collected from within and outside of the Mediterranean. Comparative DNA sequence analysis of the nuclear ribosomal cistron, including the 3′‐end of the 18S, ITS1, 5.8S, and ITS2 regions, show clear phylogenetic separation of the two taxa using parsimony and maximum likelihood analyses. Separation is maintained whether the analyses are based on just the more conserved 18S data or just the fast‐ evolving spacers. The two species are thus not conspecific. For specimens of uncertain identity (i.e. taxifolia–mexicana intermediates), a PCR diagnostic amplification can easily be performed because the ITS1 in C. taxifolia is 36 nucleotides shorter than the ITS1 in C. mexicana. Whether or not C. taxifolia has been present for a longer period of time in the marine flora, either as a cryptic endemic species or as the result of one or more introductions, represents an additional hypothesis that will require identification of biogeographic populations from throughout the world, as well as a population‐level study of the Mediterranean region.