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首页> 外文期刊>Fisheries Science >Newcomers in the Baltic Sea: an attempt to trace the origins and whereabouts of thicklip grey mullet Chelon labrosus
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Newcomers in the Baltic Sea: an attempt to trace the origins and whereabouts of thicklip grey mullet Chelon labrosus

机译：波罗的海的新移民：试图追踪厚唇gray鱼Chelon labrosus的起源和下落

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摘要

In recent years, thicklip grey mullet Chelon labrosus has shown increasing expansion of its native habitats in the north-eastern Atlantic into northerly adjacent areas including the North Sea and the brackish Baltic Sea. Despite the regular annual and seasonal occurrence of C. labrosus in the western Baltic during the warm months, nothing is known of the origin or whereabouts of the mullet during the cold season. As different possible migration scenarios can be considered, we performed otolith microchemistry analyses on specimens from the western Baltic Sea to identify the origin of this nonindigenous species. Comparison with North Sea samples revealed common habitat preferences and underlined the highly euryhaline nature of C. labrosus in different recently occupied habitats. Occasional fluctuations of Sr/Ca ratio along the growth axis suggest periodical migration between waters of different salinities but did not reveal distinct migration pathways.
机译：近年来，厚唇gray鱼Chelon labrosus已显示出其东北大西洋的原生栖息地向北相邻区域（包括北海和咸淡的波罗的海）的扩张不断扩大。尽管在温暖的月份在波罗的海西部定期出现劳氏梭状芽孢杆菌，但在寒冷季节，,鱼的起源或下落却一无所知。由于可以考虑不同的可能迁移情况，因此我们对波罗的海西部的标本进行了耳石微化学分析，以确定该非本地物种的起源。与北海样品的比较揭示了常见的栖息地偏爱，并强调了在最近新近栖息的不同栖息地中淡水梭菌的高度盐渍性。沿生长轴的Sr / Ca比值偶尔波动表明不同盐度水之间的周期性迁移，但没有揭示明显的迁移途径。

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