Аge废弃采石场中高贵小龙虾种群的结构和繁殖力

A. Alekhnovich
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引用次数: 0

摘要

在明斯克地区莫洛杰契诺区一家老砖厂的采石场对小龙虾(Astacus Astacus)种群进行了研究。在10个封闭的采石场发现了稀有的珍稀小龙虾。在与水道没有联系的封闭采石场中出现的小龙虾表明,这些种群是由人类创造的。老砖厂采石场的高贵小龙虾种群数量多。捕鳗器平均捕获量为1.31±0.77条/天。小龙虾在生命的第一年和第二年在采石场比在其他栖息地生长得快,但随后在采石场中个体的平均尺寸比在白俄罗斯的普通小龙虾生长模式要小。在采石场没有发现年龄超过6岁的个体。这表明,有一些因素决定了老年群体的高死亡率。然而,幼鱼生长的有利条件使种群数量保持在较高水平。造成这种现象的原因尚不清楚。进入青春期的高贵小龙虾个体的大小和繁殖力与其他栖息地的小龙虾相当。在采石场,卵生雌鱼的最小长度为7.2厘米。7.0 ~ 7.9 cm级产卵雌虫占16.7%,8.0 ~ 8.9 cm级产卵雌虫占38.8%,9.0 ~ 9.9 cm级产卵雌虫占70.6%,10.0 ~ 10.9 cm级产卵雌虫全部产卵。Molodechno地区采石场的高贵小龙虾种群应被视为在Neman河水体中进行重新安置的捐赠种群。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Аge structure and fecundity of the noble crayfish populations in abandoned quarries
The population of noble crayfish (Astacus astacus) was researched in quarries of an old brick plant in Molodechno district of Minsk region. Rare disappearing noble crayfish was found in 10 closed quarries. The presence of crayfish in closed quarries that are not connected with watercourses indicates that these populations were created by man. The population of noble crayfish in the quarries of an old brick factory is characterized by a high number. The average catch by eel traps was 1.31 ± 0.77 individuals/trap/day. Crayfish in the first and second year of life grew faster in quarries than in other habitats, but subsequently the average size of individuals in the quarry was smaller in comparison with the general model of noble crayfish growth in Belarus. Individuals that were older than 6 years have not been found in quarries. This indicates that there are factors that determine high mortality rate in older age groups. However, favorable conditions for the growth of juveniles allow the population to maintain their numbers at a high level. The reason for this phenomenon remains unknown. The size of noble crayfish individuals reaching puberty and the fertility is comparable to those from other habitats. In the quarry, the minimum length of an oviparous female was 7.2 cm. Egg-laying females in the 7.0-7.9 cm size class were 16.7 %, in the 8.0-8.9 cm size class - 38.8, in the 9.0-9.9 cm size class - 70.6 %, in the size class of 10.0-10.9 cm all the females were oviparous.The population of noble crayfish from the quarries of Molodechno district should be considered as donor population for carrying out resettlement into the water bodies of the river Neman.
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