摘要
We have evaluated development and growth of the ontogenetically migrating copepods in the northwestern subarctic Pacific by frequent sampling and by molting rate experiments during the spring phytoplankton bloom. Since different water masses frequently moved into the surface layers at our sampling station, the copepod abundance and species composition fluctuated greatly. Early copepodite stages of Eucalanus bungii and Neocalanus plumchrus appeared abundantly when a warmer and more saline water mass was present. Despite the fluctuating temporal pattern, the population structure revealed that each copepod species had a different life history strategy during the bloom. Eucalanus bungii were in the stages of gonad maturation, spawning and naupliar development when chlorophyll a concentrations were high. The phytoplankton bloom was utilized for development and lipid accumulation by late copepodites of Neocalanus cristatus and Neocalanus flemingeri and for development of nauplii and early copepodites of N. plumchrus. Molting experiments showed that carbon weight of ‘molters’ in the incubations was greater than that of ‘non-molters’, indicating that primarily animals with heavier body weight are those that molt into the next stage. Mean stage durations estimated by the molting rate method were on the order of 9.7 (C3) to 16.6 days (C4) for N. flemingeri, 13.9 (C3) to 29.1 days (C4) for N. plumchrus, and 12.2 days (C2) for E. bungii. Large fluctuations were observed for stage duration estimates, suggesting different development histories (i.e. ages-within-stage distributions) among the replicate incubations. From these results, we discuss development and growth of the ontogenetically migrating copepods during strongly fluctuating hydrographic conditions in the Oyashio.
摘要译文
通过频繁的采样和在春季浮游生物蜕皮率实验luated发展，在西北太平洋亚北极的ontogenetically迁移桡足类的生长。由于不同的水团经常在我们取样站搬进了表层，桡足类丰度和物种组成波动较大。Eucalanus天牛和Neocalanus plumchrus早期阶段copepodite大量出现时，一个温暖，更盐水质量存在。尽管波动的时空格局，人口结构表明，桡足类各品种有盛开在不同的生活史对策。 Eucalanus天牛是性腺成熟的阶段，产卵和无节幼体发育时，叶绿素a浓度较高。浮游生物被用于开发和脂质积累Neocalanus伯劳和Neocalanus flemingeri后期copepodites并为N的无节幼体和早期copepodites发展plumchrus。蜕皮的实验表明，在温育''''molters''''碳重量为大于的“非molters''''，指示主要动物体重较重是那些蜕皮进入下一阶段。意思是蜕皮率法估算阶段的持续时间分别为9.7（C3）的以16。6天（C4）为N. flemingeri，13.9（C3），29.1天（C4）为N. plumchrus，和12.2天（C2）为E.天牛。 ，观察期的持续时间估计大的波动，这表明不同的发展历史（即年龄在之内发行阶段）复制孵化之中。从这些结果，我们在剧烈波动的亲潮水文条件，共商发展和ontogenetically迁移桡足类的生长。
T. Kobari[a]; A. Ueda[a]; Y. Nishibe[b]. Development and growth of ontogenetically migrating copepods during the spring phytoplankton bloom in the Oyashio region[J]. Deep Sea Research Part II: Topical Studies in Oceanography, 2010,57(17-18): 1715–1726