Vertical distribution, population structure and life cycles of four oncaeid copepods in the Oyashio region, western subarctic Pacific

Vertical distribution, population structure and life cycles of four oncaeid copepods in the Oyashio region, western subarctic Pacific
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西亚北极太平洋亲潮地区四种桡足类的垂直分布、种群结构和生命周期

DOI:
10.1007/s00227-006-0382-5
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发表时间:
2006
期刊:
影响因子:
2.4
通讯作者:
T. Ikeda
T. Ikeda
中科院分区:
生物学2区
文献类型:
--
作者:
Y. Nishibe;T. Ikeda

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研究了亚北极太平洋西部Oyashio地区4种优势桡足类(Triconia borealis、Triconia canadensis、Oncaea grossa和Oncaea parila)的垂直分布和种群结构。用0.06毫米网目网从表层至2 000米深处的五个不连续层分七次(2002年3月、5月、6月、8月和10月、2003年12月和2004年2月)采集季节性样本。每个物种的主要种群发生的深度因物种而异; borealis,T. canadensis,O. grossa和O. parila。在个体发育的垂直迁移过程中,早期和晚期桡足类阶段出现的深度较深,中期桡足类阶段出现的深度较浅。canadensis和O. parila。四个oncaeid桡足类,几乎所有的桡足类阶段发生在整个研究期间,这表明他们的繁殖继续全年在该地区。然而,T. canadensis和O. grossa桡足类,世代时间为1年。对于T. borealis和O. parila桡足类,没有观察到明显的季节演替,因此其世代时间的估计是不确定的。本文综合研究了该虫的垂直分布和生活史特征。borealis,T. canadensis,O. grossa和O. parila与已发表的高纬度海域纤毛虫种类分布资料进行了比较。
Vertical distribution and population structure of four dominant oncaeid copepods (Triconia borealis, Triconia canadensis, Oncaea grossa and Oncaea parila) were investigated in the Oyashio region, western subarctic Pacific. Seasonal samples were collected with 0.06 mm mesh nets from five discrete layers between the surface and 2,000 m depth at seven occasions (March, May, June, August and October 2002, December 2003 and February 2004). The depth of occurrence of major populations of each species differed by species; the surface–250 m for T. borealis, 250–1,000 m for T. canadensis, 250–500 m for O. grossa and 500–1,000 m for O. parila. The ontogenetic vertical migration characterized by deeper occurrence of early and late copepodid stages, and shallower occurrence of middle copepodid stages was observed in T. canadensis and O. parila. Of the four oncaeid copepods, almost all copepodid stages occurred throughout the study period, suggesting that their reproduction continues throughout the year in the region. Nevertheless, a clear developmental sequence of stage-to-stage was traced for T. canadensis and O. grossa copepodids, implying their generation time to be 1 year. For T. borealis and O. parila copepodids, no clear seasonal succession was observed thus estimation of their generation time was uncertain. The present comprehensive results of vertical distribution and life cycle features for T. borealis, T. canadensis, O. grossa and O. parila are compared with the few published data on oncaeid species distributing in high latitude seas.
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