Abundance and life history ofNeomysis intermedia Czerniawsky in Lake Kasumigaura
Abundance and life history ofNeomysis intermedia Czerniawsky in Lake Kasumigaura
复制标题
霞浦湖中车氏新螨的丰度及生活史
DOI：
10.1007/bf00008096
复制
发表时间：
1982
期刊：
影响因子：
2.6
通讯作者：
S. Ichimura
中科院分区：
文献类型：
--
作者：
H. Toda;M. Takahashi;S. Ichimura
对霞浦湖中间新糠虾的每周观测显示，春季和秋季的数量有两个高峰（超过104个m-2），夏季和冬季的数量最低（不到103个m-2）。它们的丰度增加是伴随着高的卵比率，这表明丰度的增加是由高繁殖率引起的。糠虾种群减少的主要原因包括鱼类捕食和商业渔业，以及糠虾可能的水平迁移。湖泊生活史有两种类型。一种类型（越冬代）的寿命约为6-7个月，每窝产卵约27枚。另一种，从春天到秋天出现，在3-6周内成熟，体积较小，每窝产12枚卵。N.从3月到11月，
Weekly observations ofNeomysis intermediain Lake Kasumigaura showed two major peaks in abundance during spring and autumn (more than 104individuals m−2) and minimum levels in summer and winter (less than 103individuals m−2). Their increase in abundance followed a high egg ratio, suggesting that the increase in abundance was caused by a high reproductive rate. Major contributors to mysid population decreases include fish predation and commercial fisheries, and possible horizontal migration of the mysids.N. intermediashowed two types of life history in the lake. One type (overwintering generation) has a life span of about 6–7 months and produces about 27 eggs per brood. Another, appearing from spring to autumn, matures in 3–6 weeks at a smaller size, and produces 12 eggs per brood. The reproductive season ofN. intermediawas continuous from March through November.