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首页> 外文期刊>Venus >Habitat Description of Potamopyrgus antipodarum (Caenogastropoda: Hydrobiidae) in Some Areas of Japan: How Far Will It Spread?
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Habitat Description of Potamopyrgus antipodarum (Caenogastropoda: Hydrobiidae) in Some Areas of Japan: How Far Will It Spread?

机译：在日本某些地区，安息蛾（Potamopyrgus antipodarum）的栖息地描述：它将传播多远？

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摘要

The habitats of Potamopyrgus antipodarum at four localities in the Kanto district (Shiobara, Chiba, Banyu Park and Yugawara) and at one location in the Kinki district (Hassaka) were investigated and the relationships between snail density and some environmental factors were analyzed. All field studies were undertaken during August and September in 2007 and 2010. The snails tended to be distributed in shallow water, which is consistent with the general features demonstrated in past studies, and in rather various velocity currents. They were distributed in high densities in a small creek entering Lake Biwa at Hassaka, but not at all in the coastal zone of Lake Biwa. At Shiobara and Yugawara, hot springs discharge into the rivers, but the mean water temperature in summer was less than 25°C, which is the upper limit for P. antipodarum reported in past studies, at all sites at both localities. Therefore, the hot spring discharges may make these areas rather suitable for P. antipodarum by increasing thewater temperature from autumn to spring. At Chiba, R antipodarum occurred in high densities in a creek in which the summer daytime water temperature reached 33.3°C. No clear relationship was determined between snail density and DO, pH, EC, NH_4-N, PO4-P and Ca~（2+）. P. antipodarum occurred at high densities in water with DO or Ca~（2+） concentration values close to the lowest limits reported in past studies. A laboratory experiment for the thermal tolerance of snails showed that all individuals from the Chiba population survived until the end of the experiment (21 days) at 31°C, but all but one snail from Kanro (near Hassaka) had died by the 14th day. The majority of the snails at Kanro were the same haplotype as those at Chiba and therefore maybe the same clone. Therefore, it is likely that the high thermal tolerance of the Chiba population reflects their ability to acclimate, rather than a unique characteristic of the genotype of the Chiba population. Based on these results, the potential spread of P. antipodarum through Japan was discussed.
机译：调查了关东地区的四个地区（盐原，千叶，番牛公园和汤河原）和近畿地区的一个地方（八坂）的Potamopyrgus antipodarum的栖息地，并分析了蜗牛密度与一些环境因素之间的关系。所有的田间研究都是在2007年和2010年的8月和9月进行的。蜗牛倾向于分布在浅水中，这与过去的研究表明的一般特征一致，并且在各种速度流中都一致。它们以高密度分布在进入哈萨卡（Hassaka）的琵琶湖的一条小河中，但根本不在琵琶湖的沿海地区。在Shiobara和Yugawara，温泉排入河流，但夏季的平均水温低于25°C，这是以往研究在两个地区所有地点报告的P. antipodarum的上限。因此，通过从秋季到春季增加水温，温泉的排水可以使这些地区更适合于P. antipodarum。在千叶，夏季白天水温达到33.3°C的小溪中高密度地出现了R antipodarum。蜗牛密度与DO，pH，EC，NH_4-N，PO4-P和Ca〜（2+）之间没有明确的关系。高浓度的P. antipodarum发生在水中，DO或Ca〜（2+）的浓度值接近过去研究中报告的最低限值。一项针对蜗牛的耐热性的实验室实验表明，千叶种群的所有个体都在31°C存活到实验结束（21天），但是，除了一只Kanro（靠近Hassaka）的蜗牛在第14天死亡。 。 Kanro的大多数蜗牛与Chiba的蜗牛具有相同的单倍型，因此可能是相同的克隆。因此，千叶种群的高耐热性很可能反映了它们的适应能力，而不是千叶种群基因型的独特特征。根据这些结果，讨论了P. antipodarum在日本的潜在传播。

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