Phylogeography and shell morphology of the pelagic snail Limacina helicina in the Okhotsk Sea and western North Pacific
Phylogeography and shell morphology of the pelagic snail Limacina helicina in the Okhotsk Sea and western North Pacific
复制标题
DOI：
10.1007/s12526-021-01166-z
复制
发表时间：
2021-02
影响因子：
1.6
通讯作者：
Keisuke Shimizu;Koji Noshita;K. Kimoto;Takenori Sasaki
中科院分区：
文献类型：
--
作者：
Keisuke Shimizu;Koji Noshita;K. Kimoto;Takenori Sasaki
远洋蜗牛Limacina helicinaPhipps，1774广泛分布于高纬度海域，是海洋酸化的敏感生物指示物。众所周知，物种内部或物种之间的种群对海洋酸化的反应模式各不相同。因此，了解其遗传群体结构，识别其潜在种具有重要意义。螺旋藻在不同的地区（北大西洋，L. helicinaformahelicinaPhipps，1774;西北太平洋L. helicinaf.acutaSpoel，1967;东北太平洋L. helicinaf.pacificaDall，1871;鄂霍次克海，L. Helicinaf.ochotensisShkoldina，1999：Spoel，1967，pp. 257，349）。Shimizu等人最近的一项研究（Journal of Molluscan Studies 84：30-37，2018）显示了两种形式之间的明显遗传分化，L. Helicinaformahelicina（北冰洋斯瓦尔巴群岛）和L.螺旋藻属。acuta（西北太平洋K2站）（ΦCT = 0.59282），利用部分线粒体细胞色素c氧化酶亚基I（COI）基因序列。然而，这个物种的其他形式是否在遗传上不同仍然未知。这里，我们专注于L。对鄂霍次克海的一种螺形目Helicinaf.ochotensis的贝壳形态和线粒体COI基因部分序列进行了比较。螺旋藻属。acuta，发现于北太平洋西部。我们发现L. Helicinaf. ochotensionseluted from the Sea of Okhotsk（off coast of Monbetsu，北海道，Japan）和L.螺旋藻属。采集自北太平洋西部（K2站）。然而，对mtDNA COI区（503 bp）的分子分析表明，从门别（鄂霍次克海）收集的大多数个体为单倍型1（75.5%），这也是在L中发现的主要单倍型。螺旋藻属。acuta（北太平洋西部），结果表明L.螺旋藻经常通过洋流散布在鄂霍次克海和北太平洋西部之间。因此，这两种形式，L.螺旋藻属。acuta和L.螺旋藻属。ochotensis，更有可能是由于表型可塑性响应不同的环境参数，如温度和盐度，而不是在他们的遗传背景的差异。
The pelagic snailLimacina helicinaPhipps, 1774 is widely distributed in high-latitude seas and is a sensitive bioindicator of ocean acidification. It is known that the response patterns to ocean acidification differ among populations within or among species. Thus, it is important to understand their genetic population structure and identify the cryptic species.L. helicinadisplays different shell morphotypes, called “formae,” in different regions (North Atlantic,L. helicinaformahelicinaPhipps, 1774; Northwest Pacific,L. helicinaf.acutaSpoel, 1967; Northeast Pacific,L. helicinaf.pacificaDall, 1871; Okhotsk Sea,L. helicinaf.ochotensisShkoldina, 1999: Spoel, 1967, pp. 257, 349). A recent study by Shimizu et al. (Journal of Molluscan Studies 84:30-37, 2018) showed clear genetic differentiation between two formae,L. helicinaformahelicina(Svalbard in the Arctic Ocean) andL. helicinaf. acuta(station K2 in the western North Pacific) (ΦCT = 0.59282), using partial mitochondrial cytochrome c oxidase subunit I (COI) gene sequences. However, whether other formae of this species are genetically distinct remain unknown. Here we focused onL. helicinaf.ochotensis, which inhabits the Sea of Okhotsk, and compared its shell morphology and partial mitochondrial COI gene sequences with another forma,L. helicinaf. acuta, which is found in the western North Pacific. We found differences in the shell morphology ofL. helicinaf.ochotensiscollected from the Sea of Okhotsk (off the coast of Monbetsu, Hokkaido, Japan) andL. helicinaf. acutacollected from the western North Pacific (station K2). However, molecular analysis of an mtDNA COI region (503 bp) revealed that most individuals collected from Monbetsu (Sea of Okhotsk) were haplotype 1 (75.5%), which is also the major haplotype found inL. helicinaf. acuta(western North Pacific).Our results suggest that individuals ofL. helicinaare frequently dispersed between the Sea of Okhotsk and the western North Pacific by ocean currents. Thus, the two formae,L. helicinaf. acutaandL. helicinaf. ochotensis, are more likely to be attributable to phenotypic plasticity in response to different environmental parameters, such as temperature and salinity, than to differences in their genetic backgrounds.