Vertical distribution, life cycle and body allometry of two oceanic calanoid copepods (Pleuromamma scutullata and Heterorhabdus tanneri) in the Oyashio region, western North Pacific Ocean
Vertical distribution, life cycle and body allometry of two oceanic calanoid copepods (Pleuromamma scutullata and Heterorhabdus tanneri) in the Oyashio region, western North Pacific Ocean
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DOI：
10.1093/plankt/22.1.29
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发表时间：
2000
影响因子：
2.1
通讯作者：
A. Yamaguchi;T. Ikeda
中科院分区：
文献类型：
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作者：
A. Yamaguchi;T. Ikeda
1996年9月至1997年10月，在俄亥俄州地区对天牛侧乳和丹宁异步甲的昼夜和季节垂直分布、生活史和身体异速生长进行了调查。用0.1 mm网状密网拖曳表层至2000m之间的5个不同深度，每月采集样品，有效地采集了第1~6级斑节藻类和3~6级棕榈藻。1996年12月、1997年4月和10月的昼夜采样显示，这两个物种在夜间上升。两种桡足类垂直分布型的季节差异不显著，且天牛分布在比丹尼尔氏腹足动物(600-850米)浅得多的深度(250-500米)。通过追踪每个桡足类阶段丰度高峰的顺序变化，这两个物种被认为每年产生一代。据估计，天牛的主要繁殖季节在春季，而唐氏沼虾的主要繁殖季节在冬季。蛋白质组长度与湿重、干重和无灰干重之间的关系表明，单次蜕皮重量的增加，单绒毛虫的增加幅度远大于丝状毛虫。这些不同的特征与这两个物种不同的食物习性和Oyashio地区食物有机体的生产周期有关。
Diel and seasonal vertical distribution, life cycle and body allometry of Pleuromamma scutullata and Heterorhabdus tanneri were investigated in the Oyashio region during September 1996 through October 1997. Monthly samples were collected with 0.1 mm mesh closing nets towed through five discrete depths between the surface and 2000 m. Copepodite stages 1 through 6 of P.scutullata and 3 through 6 of H.tanneri were collected effectively with the nets. Day-night samplings during December 1996, April and October 1997 revealed both species ascend at night. Seasonal differences in the vertical distribution patterns of both copepods were insignificant, and P.scutullata was distrib- uted at a much shallower depth (250-500 m) than H.tanneri (600-850 m). By tracing the sequential changes in abundance peaks of each copepodite stage, both species are considered to produce one generation per year. The main reproduction season was estimated to occur in spring for P.scutullata and in winter for H.tanneri. The relationships between prosome length and wet weight, dry weight, and ash-free dry weight indicated that the increase in weight per molt was much greater in H.tanneri than in P.scutullata. These dissimilar features are discussed in relation to the dissimilar food habits of these two species and the production cycle of food organisms in the Oyashio region.