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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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 abasis to estimate generation length. Most copepodite stages occurred throughout the year; youngcopepodites (C2 to C5) were most abundant in May-October, while adults were most abundant inMarch-August. Reproduction continued throughout the year, with a peak in April-August. All copepodite stages were consistently distributed at 100-400 m depth. Limited nocturnal ascent was seen inadults, 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 developmental 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 sequences in major reproduction seasons are discussed by comparing the data of other calanoid copepods reported from Toyama Bay.
The Plankton Society of Japanの論文

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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