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首页> 外文期刊>Marine ecology progress series >Morphological variation among populations of an invasive jellyfish
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Morphological variation among populations of an invasive jellyfish

机译：入侵性水母种群之间的形态变异

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The Australian spotted jellyfish Phyllorhiza punctata appeared in the Northern Gulf of Mexico in spectacular numbers during the summer of 2000. P. punctata was first described from Eastern Australia, although its native habitat probably extends across Northern Australia and into SE Asia. Among invasive marine species, P. punctata has a relatively well-documented history of invading tropical and subtropical environments. Despite this, there is no direct evidence of transloca-tion routes or the mechanisms by which translocation has occurred. The invasion of the Northern Gulf of Mexico has been theorized to represent an inevitable distributional shift of an invasive hub population in the Caribbean Sea facilitated by periodic oceanographic connections between the regions, or by the transportation of benthic scyphistomae on the hulls of ships. Regardless of the translocation mechanism, the relatively close geographical proximity of the Caribbean to the Northern Gulf of Mexico makes this theory conceptually appealing. Based on a 'hub and spoke' model of marine bio-invasion, we postulated that populations of P. punctata from regions more geographically distant than those from the Caribbean and the Gulf of Mexico have been separated for longer periods of time; therefore, populations from the Caribbean and the Gulf of Mexico would bear greater morphological similarity to each other than to those of other regions due to higher levels of underlying genetic relat-edness. We used multivariate analyses to compare the morphological similarity of 6 populations of P. punctata distributed between the Gulf of Mexico, Caribbean and the east and west coasts of Australia. Contrary to our expectations, analyses showed that populations from the Caribbean and the Gulf of Mexico are the least similar to each other. The analyses suggest that the invasive population in the Gulf of Mexico is most likely to have originated from geographically disparate populations in either Australia or the west coast of the United States. Populations from Australia and the west coast of the United States were the most similar to each other, while the Caribbean population bore the least similarity to all other populations.
机译：澳大利亚斑点海summerPhyllorhiza punctata于2000年夏季以惊人的数量出现在墨西哥北部海湾。P。punctata最初是从澳大利亚东部描述的，尽管其本土栖息地可能横跨澳大利亚北部并进入东南亚。在入侵海洋物种中，P。punctata具有入侵热带和亚热带环境的相对有据可查的历史。尽管如此，没有直接证据表明易位途径或发生易位的机制。从理论上讲，对墨西哥湾北部的入侵代表着加勒比海入侵性中枢种群不可避免的分布转移，这是由于各地区之间定期进行海洋学联系或通过在船体上运输底栖海鞘鞘状茎虫造成的。无论采用何种运输机制，加勒比海与墨西哥北部海湾的地理相对距离都使得该理论在概念上具有吸引力。基于海洋生物入侵的“枢纽和口语”模型，我们推测，与加勒比海和墨西哥湾相比，地理上更远的地区的P. punctata种群已经分离了更长的时间。因此，由于潜在的遗传相关性较高，加勒比海地区和墨西哥湾地区的种群彼此之间的形态相似性要高于其他地区。我们使用多变量分析比较了分布在墨西哥湾，加勒比海以及澳大利亚东海岸和西海岸之间的6个点点对虾的形态相似性。与我们的预期相反，分析表明，来自加勒比海地区和墨西哥湾的人口彼此之间最不相似。分析表明，墨西哥湾的入侵人口最有可能来自澳大利亚或美国西海岸的地理上不同的人口。来自澳大利亚和美国西海岸的人口彼此最相似，而加勒比海人口与所有其他人口之间的相似度最小。

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