Vertical distribution, life cycle, and developmental characteristics of the mesopelagic calanoid copepod Gaidius variabilis (Aetideidae) in the Oyashio region, western North Pacific Ocean
Vertical distribution, life cycle, and developmental characteristics of the mesopelagic calanoid copepod Gaidius variabilis (Aetideidae) in the Oyashio region, western North Pacific Ocean
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北太平洋西部亲潮地区中层桡足类桡足类Gaidius variabilis (Aetideidae)的垂直分布、生命周期和发育特征
DOI：
10.1007/s002270000316
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发表时间：
2000
期刊：
影响因子：
2.4
通讯作者：
T. Ikeda
中科院分区：
文献类型：
--
作者：
A. Yamaguchi;T. Ikeda
通过对野外桡足动物种群的分析，结合卵孵化和足部发育的室内饲养资料，研究了本地区中远洋桡足动物的垂直分布、生活史和发育特征。从地表至≤2000米的5个离散深度进行现场采样，大约每个月进行一次，持续1年。大多数g。变化发生在600至1000米深度之间。注意到适度程度的反日珥垂直迁移行为和一些特定阶段的深度分布模式。全年都观察到桡足动物的所有阶段，表明g。摘要。根据6 ~ 8月桡足类第1阶段（C1）丰度高峰，结合实验室饲养实验获得的卵和nauplii发育时间，推断出主要产卵季节为4 ~ 6月，即浮游植物繁殖期。通过对桡足动物各阶段（C4 ~ C6区分雌雄）丰度峰值的追踪，推测雄、雌两代分别为2年和1年。干、干、无灰分干重各生育期间增量均以C3/C4植株最大，C5/C6植株最小。C3/C4和C4/C5的增量雄性大于雌性，反映了雄性的阶段持续时间更长。C5/C6雄性的体重没有增加，可能是因为C6雄性停止了摄食。这些结果对于g。与其他地区报道的一些中远洋桡足动物的变异进行了比较。
Vertical distribution, life cycle, and developmental characteristics of the mesopelagic copepodGaidius variabilisBrodsky in the Oyashio region were investigated by combining analyses of field copepodite populations with laboratory-rearing data of egg hatching and naupliar development. Field samplings from five discrete depths between the surface and ≤2000 m were made approximately every month for 1 year. Most populations ofG. variabilisoccurred between 600 and 1000 m depth. A modest degree of reversed diel vertical migration behavior and some stage-specific depth-distribution patterns were noted. All copepodite stages were observed throughout the year, suggesting a year-round spawning ofG. variabilis. From a prominent abundance peak of Copepodite Stage 1 (C1) seen in June to August, together with development times of eggs and nauplii obtained in laboratory-rearing experiments, the major spawning season was extrapolated to be April to June, the phytoplankton bloom season. Tracing the peak abundance of each copepodite stage (distinguishing males and females for C4 to C6), the generation times of males and females were deduced as 2 and 1 year, respectively. All between-stage increments in terms of wet-, dry-, and ash-free dry weights were greatest in C3/C4, and least in C5/C6 for both males and females. The increments in C3/C4 and C4/C5 were greater for males than for females, reflecting a longer stage duration of the males. These weights did not increase in C5/C6 males, possibly because feeding ceased in C6 males. These results forG. variabilisare compared with those for some mesopelagic copepods previously reported from other regions.
影响因子：
2.1
作者：
A. Yamaguchi;T. Ikeda
通讯作者：
A. Yamaguchi;T. Ikeda