Evolutionary radiation of present-day Nautilus and Allonautilus
Evolutionary radiation of present-day Nautilus and Allonautilus
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DOI：
10.4003/006.029.0221
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发表时间：
2011-03-31
影响因子：
0.5
通讯作者：
Irlam, Justin
中科院分区：
文献类型：
--
作者：
Bonacum, James;Landman, Neil H.;Irlam, Justin
大量的盘状鹦鹉螺化石记录表明，它们构成了古代海洋中不同的物种组合。今天，它们的代表是鹦鹉螺属，1758年和AlLonautilus Ward和Saunders，1997年，居住在整个柔道-太平洋地区的珊瑚礁系统。鹦鹉螺一些个体种群在壳层形态上表现出细微的差异，这些形态差异可能被用来诊断不同的物种。另一种观点认为，这些差异只是地理上的局部的，在广泛分布的分类群内的形态变异，通常指的是鹦鹉螺属，1758。本文利用16S rDNA和细胞色素氧化酶C亚单位这两个线粒体基因区的分子特征，提出了现代鹦鹉螺和长尾鹦鹉螺的系统发育假说。本文对印度尼西亚(安邦海峡)、菲律宾、瓦努阿图(新赫布里底群岛)、巴布亚新几内亚、卡特礁和鱼鹰(澳大利亚昆士兰大堡礁)和巨尾鹦鹉螺(Sowerby，1849)以及雷氏鹦鹉螺(Sowerby，1849)(西澳大利亚州罗利肖尔斯)、贝氏鹦鹉(Saunders，1981)(帕劳)和斯滕菲勒斯(Sowerby，Sowerby，1849)的种群以及雷氏鹦鹉螺(Sowerby，1849)(Sowerby，1849)和狭尾鹦鹉螺(N.stomphalus，Sowerby，1849)的样本进行了调查。1849)(澳大利亚昆士兰)。腹足类Crepidula striolata(Menke，1851)被列为外类群。我们的结果表明，鹦鹉螺目前正在整个印度-太平洋地区经历一段进化辐射期。严格共识树的拓扑结构表明，鹦鹉螺属和AlLonautilus之间的基本分歧发生在今天的新几内亚岛和澳大利亚东北部大堡礁北部周围的水域。紧随其后的是在瓦努阿图、斐济和美属萨摩亚的大头金龟和庞贝利乌斯种群的共同祖先向东迁徙。随后向西的移民导致了澳大利亚、菲律宾、帕劳和印度尼西亚西海岸外的人口的建立。我们的结果还表明，大头金鱼和黑头金鱼是系统发育种。然而，n.pompilius是一个种群的同源组合，并不代表一个真正的系统发育种。鹦鹉螺属内部的差异似乎是由地理隔离驱动的，我们讨论了这可能是动物生态对扩散施加限制的结果。
The extensive fossil record of coiled nautiloids indicates that they comprised a diverse assemblage of species in ancient oceans. Today they are represented by the genera Nautilus Linnaeus, 1758 and Allonautilus Ward and Saunders, 1997, inhabiting reef systems throughout the Judo-Pacific region. Some individual populations of Nautilus show subtle differences in shell morphologies, and these morphological differences may be used to diagnose different species. An alternative view is that these differences are simply geographically localized, morphological variants within the broadly distributed taxon generally referred to as Nautilus pompilius Linnaeus, 1758. Here we present a hypothesis for the phylogeny of present-day Nautilus and Allonautilus using molecular characters from two mitochondrial gene regions, 16S rDNA and Cytochrome Oxidase c subunit T. Populations of N. pompilius in Indonesia (Ambon Strait), the Philippines, Vanuatu (New Hebrides Islands), Papua New Guinea, Carter Reef and Osprey Reef (Great Barrier Reef, Queensland, Australia) and N. macromphalus (Sowerby, 1849) in New Caledonia were surveyed as well as samples of N. repertus (Sowerby, 1849) (Rowley Shoals, Western Australia), N. belauensis (Saunders, 1981) (Palau), and N. stenomphalus (Sowerby, 1849) (Queensland, Australia). The gastropod Crepidula striolata (Menke, 1851) was included as an outgroup. Our results indicate that Nautilus is currently undergoing a period of evolutionary radiation throughout the Indo-Pacific region. The topology of the strict consensus tree suggests that the basal divergence between Nautilus and Allonautilus occurred in the waters surrounding the present-day island of New Guinea and the northern part of the Great Barrier Reef in northeast Australia. This was followed by a migration to the east by the common ancestor of N. macromphalus and the N. pompilius populations in Vanuatu, Fiji, and American Samoa. A subsequent migration to the west led to the founding of populations off the west coast of Australia, the Philippines, Palau, and Indonesia. Our results also indicate that N. macromphalus and A. scrobiculatus are phylogenetic species. However, N. pompilius is a paraphyletic assemblage of populations and does not represent a true phylogenetic species. Divergences within the genus Nautilus appear to be driven by geographic isolation, and we discuss how this may be a result of constraints on dispersal imposed by the ecology of the animals.