Abstract

The distribution and size composition of the gastropod Boreotrophon candelabrum in Vostok Bay of the Sea of Japan were investigated in 2014–2019. Mollusks occurred on different bottom types and biogenic substrates, except clean washed sands of open coves and wave-exposed rocky–boulder shores. The highest abundance of B. candelabrum was observed at the head of the bay, where the density and biomass were up to 5 ind./m² and approximately 30 g/m², respectively. This is in agreement with the density and biomass estimates obtained in the first quantitative survey of macrobenthos in Vostok Bay in 1971–1975 [6]. In the summer, mollusks with a shell height of 10 to 62 mm were found in the bay. The size composition of B. candelabrum significantly varied in different areas of the bay. A relatively narrow range of shell sizes and low number or the absence of individuals larger than 44–50 mm were observed at the head of the bay on a silty bottom and in a wave-exposed area. In the B. candelabrum population, there was a tendency for the proportion of large mollusks with a shell height of more than 40 mm to increase between 2014 and 2017 and to decrease in subsequent years. The reasons for the variations in population composition are discussed.

中文翻译：

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环境条件对日本海沃斯托克湾腹足类番茄的分布和大小组成的影响（里夫，1848年）（M科）

摘要

在2014–2019年期间，调查了日本海沃斯托克湾腹足纲大叶紫菜的分布和大小组成。软体动物发生在不同的底部类型和生物成因基质上，除了干净的开阔小海湾和波浪暴露的岩石巨石海岸经过冲刷的沙子。的丰度最高B.烛台在托架的头部，其中，所述密度和生物量分别为最多5 ind./m观察²和大约30克/米²分别。这与1971–1975年沃斯托克湾大型底栖动物的第一次定量调查中获得的密度和生物量估计值相符[6]。夏季，在海湾中发现了壳高为10至62毫米的软体动物。大小组成B. candelabrum在海湾的不同区域变化很大。在粉质底部和波浪暴露区域的海湾顶部观察到壳大小相对较窄的范围，数量较少或没有个体大于44-50 mm。在B. candelabrum种群中，壳高超过40 mm的大型软体动物的比例在2014年至2017年之间有增加的趋势，并在随后的几年中有所下降。讨论了人口构成变化的原因。