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The Spatial Distribution, Growth, and Reproduction of the Bivalve Macoma calcarea (Gmelin, 1791) off the Novaya Zemlya Coast
Russian Journal of Marine Biology ( IF 0.6 ) Pub Date : 2021-04-05 , DOI: 10.1134/s1063074021010077
A. E. Noskovich

Abstract

The population and biological characteristics of the bivalve mollusk Macoma calcarea (Gmelin, 1791) off the Novaya Zemlya Archipelago, eastern Barents Sea, are considered. The biomass of Macoma clams in the study area varied from 3.9 to 350.6 g/m2; the population density varied from 13.3 to 196.6 ind./m2. It was shown that the biomass and population density of clams do not depend on the depth and near-bottom water temperature; the size structures and growth rates were similar at different depths. The life span was found to differ significantly between clams that lived at depths shallower than 100 m (17 years) and deeper (26 years). At depths shallower than 100 m, aggregations of this species consisted mainly of juveniles (up to 4 mm); at the stations with greater depths, both juveniles and individuals with a shell length of 14.9 mm were found in abundance. Individuals of M. calcarea reach sexual maturity at an age of 3–4 yr, with a shell length of over 7.5 mm. At the stations with greater depths, there were significantly more mature clams than immature ones, and more males than females. Three stages of gametogenesis were identified in the examined females. The size of mature, ready to be spawned oocytes was 175 μm.



中文翻译:

Novaya Zemlya海岸外的双壳类Macoma calcarea(Gmelin,1791)的空间分布,生长和繁殖

摘要

考虑了在巴伦支海东部诺瓦亚泽姆利群岛外的双壳软体动物Macoma calcarea(Gmelin,1791)的种群和生物学特征。研究区Macoma蛤的生物量在3.9至350.6 g / m 2之间; 人口密度从13.3 ind./m 2至196.6 ind./m 2。结果表明,蛤的生物量和种群密度与深度和近底部水温无关。不同深度的大小结构和增长率相似。发现生活在深度小于100 m(17年)和更深(26年)的蛤between之间的寿命差异很大。在小于100 m的深度处,该物种的聚集主要由幼体(最大4毫米)组成。在更深的站中,发现了许多幼鱼和一个壳长为14.9毫米的个体。M. calcarea的个人在3-4岁时达到性成熟,壳长超过7.5毫米。在深度更大的站中,成熟的蛤比未成熟的蛤明显多,雄蛤多于雌蛤。在所检查的雌性中鉴定出配子发生的三个阶段。成熟的,易于产卵的卵母细胞的大小为175μm。

更新日期:2021-04-06
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