Diel vertical migration, population structure and life cycle of the copepod Scolecithricella minor (Calanoida: Scolecitrichidae) in Toyama Bay, southern Japan Sea
Diel vertical migration, population structure and life cycle of the copepod Scolecithricella minor (Calanoida: Scolecitrichidae) in Toyama Bay, southern Japan Sea
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日本海南部富山湾桡足类小蚧科 (Calanoida: Scolecitrichidae) 的昼夜垂直洄游、种群结构和生命周期
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
K. Hirakawa
中科院分区：
文献类型：
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作者：
A. Yamaguchi;T. Ikeda;K. Hirakawa
调查了日本海南部富山湾小型小盾壳虫的季节性种群结构（桡足类-2阶段至成虫）和昼夜垂直迁移模式。卵和无节幼体在实验室中在三种不同温度（0.5、5和10°C）下饲养，作为估计世代长度的基础。大多数桡足类阶段发生在全年;年轻的桡足类（C2至C5）是最丰富的5月至10月，而成人是最丰富的3月至8月。繁殖全年持续进行，4月至8月达到高峰。所有科普层柱阶段一致地分布在100-400米深度。有限的夜间上升被认为是在成年人，但并不总是年轻的桡足类。根据生境温度、卵和无节幼体的发育时间与温度的函数关系，并假定这些发育时间在哲水蚤一个生活史中所占的比例，计算了哲水蚤的世代长度。未成年人估计为44- 76 d。使用这一估计的世代长度范围作为指导，确定了五个队列的顺序发展。另外两个额外的队列，无法明确追溯，被认为是每年发生的S共7个队列。未成年人在富山湾。本文介绍了我国南方沙蚕垂直分布的现状。与其他地区报道的同类物种进行了比较。自S. minor是典型的碎屑食性动物，本文通过对富山湾其它哲水蚤类资料的比较，讨论了主要繁殖季节的营养型序列。
The seasonal population structure (copepodite-2 stage through adults) and diel vertical migration pattern of Scolecithricella minor in Toyama Bay, southern Japan Sea, were investigated. Eggs and nauplii were reared in the laboratory at three different temperatures (0.5, 5 and 10°C) as a basis to estimate generation length. Most copepodite stages occurred throughout the year; young copepodites (C2 to C5) were most abundant in May-October, while adults were most abundant in March-August. Reproduction continued throughout the year, with a peak in April-August. All cope podite stages were consistently distributed at 100-400 m depth. Limited nocturnal ascent was seen in adults, but not always for younger copepodites. Based on habitat temperature, development times of eggs and nauplii expressed as a function of temperature, and assumed proportion of these develop mental times in one life cycle of calanoid copepods, the generation length of S. minor was estimated to be 44-76d. Using this estimated generation length range as a guide, the sequential development of five cohorts was identified. An additional two extra cohorts, which were not clearly traceable, are considered to have occurred for a total of 7 cohorts per year for S. minor in Toyama Bay. The present data on the vertical distribution of S. minor are compared with those reported from other regions for the same species. Since S. minor is considered to be a typical detritus feeder, trophic-type-related se quences in major reproduction seasons are discussed by comparing the data of other calanoid copepods reported from Toyama Bay.