Mortality of the Sakhalin surf clam in Sendai Bay in the early benthic stage
Mortality of the Sakhalin surf clam in Sendai Bay in the early benthic stage
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仙台湾库页岛贝在底栖早期的死亡率
DOI：
10.2331/suisan.54.193
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发表时间：
1988
影响因子：
0.4
通讯作者：
K. Sasaki
中科院分区：
文献类型：
--
作者：
K. Sasaki
对1983-1986年在仙台湾发现的萨哈林岛幼海蚌Spisula sachalinensis的死亡率进行了估算。在它们的分布中发现了一个共同的模式，这表明有一个定期的，有效的机制来收集年轻的蛤蜊。这种模式随着时间的推移保持不变，至少在宏观上显示出幼蛤的轻微运动。每一年级都呈指数级下降，死亡率在各年级之间波动很大。平均死亡率为每月0.4至0.8人。在渔场定居的幼鱼的数量也各不相同，它与随后的死亡率之间没有显着的相关性。每一年级的相对强度取决于其产生后约6个月内的减少率，并将主要由沉降后死亡率的波动而不是远洋生活期间的大量减少来控制。
Mortality rate after settlement was estimated for 1983-1986 year classes of the young Sakhalin surf clam Spisula sachalinensis in Sendai Bay. A common pattern is found in their distribution, suggesting a regular, efficient mechanism to gather young clams. The pattern remains unchanged with time, showing an insignificant movement of young clams at least macroscopically. Each year class declines exponentially and mortality rate fluctuates widely among year classes. The mean mortality rate ranges from 0.4 to 0.8 per month. Abundance of juveniles settling in the fishing ground also varies and no significant correlation is found between it and the subsequent mortality. The relative strength of each year class depends on the rate of reduction during about 6 months after it is produced, and would be controlled primarily by the fluctuation in mortality after settling rather than the heavy reduction during the pelagic life.