Population structure and life cycle of the mesopelagic ostracod Conchoecia pseudodiscophora in Toyama Bay, southern Japan Sea
Population structure and life cycle of the mesopelagic ostracod Conchoecia pseudodiscophora in Toyama Bay, southern Japan Sea
复制标题
日本海南部富山湾中层介形类 Conchoecia fakediscophora 的种群结构和生命周期
DOI：
10.1007/bf00349703
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发表时间：
1992
期刊：
影响因子：
2.4
通讯作者：
A. Imamura
中科院分区：
文献类型：
--
作者：
T. Ikeda;A. Imamura
利用一年(1990年2月1日至1991年1月30日)在日本南部富山湾用双网目NORPAC网(0.35 mm和0.10 mm)在0~500m垂直网目上采集的样本，研究了日本南部富山湾中远洋介形虫Conchoecia puodisophoraRudjakov的种群结构和生活史。用单一的NORPAC网(0.06 mm网目)采集更多的样本，以检查该物种的卵和所有幼虫的垂直分布格局。受孕雌虫的比例表明，Fc的繁殖。全年都有假圆盘持续现象，但在4-7月达到高峰。卵和龄期I、II分布在500m以下，350~500m层昼夜以高级龄期最多。根据各龄期在时间序列样本中的丰度峰值，估计各龄期的发育时间分别为2.5、4、3、7和11个月。因此，新产卵孵化和成虫总共需要30个月。胃饱满指数显示各龄期的取食活动没有季节性，但年龄较大的幼虫取食活动较低，特别是成年雄性幼虫。将目前的结果与其他几种介形类的结果进行了比较，试图描述介形类的生活史。在日本海中层海洋带“零度以下”温度的水域中栖息的假盘状珊瑚。
The population structure and life cycle of the mesopelagic ostracodConchoecia pseudodiscophoraRudjakov in Toyama Bay, southern Japan Sea, were investigated using a time-series of samples collected during 0 to 500 m vertical hausls with twin-type Norpac nets (0.35 and 0.10 mm mesh) over one full year (1 February 1990 to 30 January 1991). Additional samples were also collected with a single-type closing Norpac net (0.06 mm mesh) to examine the vertical distribution patterns of eggs and all instars of this species. The proportion of gravid females present indicated that reproduction ofC. pseudodiscophoracontinues throughout the year, but peaks in April–July. Eggs and Instars I and II were distributed below 500 m, while the more advanced instars were most abundant in the 350 to 500 m stratum by both day and night. Based on the abundance peaks of each instar in the time-series samples, development times were estimated to be 2.5, 4, 3, 7 and 11 mo for Instars III, IV, V, VI, and VII, respectively. Thus, a total of 30 mo is required for newly spawned eggs to hatch and reach adulthood. Stomach-fullness indexes revealed no seasonality in the feeding activity of any instar stage, but that feeding activity was low in older instars, particularly in adult males. The present results are compared with those for a few other ostracod species, in an attempt to characterize the life cycle ofC. pseudodiscophorainhabiting waters of “subzero” temperature in the mesopelagic zone of the Japan Sea.