Ban, S. (1992). Seasonal distribution, abundance and viability of diapause eggs of Eurytemora affinis (Copepoda: Calanoida) in the sediment of lake Ohnuma, Hokkaido. Bulletin of Plankton Society of Japan. 39(1):41-48.

76028

Ban, S.

1992

39(1):41-48.

Publication

Available in Wilson Copepod Library (non-digital)

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Distribution, abundance and viability of diapause eggs of the calanoid copepod Eurytemora affinis (Poppe) in the sediment of Lake Ohnuma, Hokkaido, were investigated during the period from March to November 1988. The eggs occurred at a high density of 0.5 - 7 x 10(6) eggs.m(-2) throughout the study period in both the deep and shallow areas of the lake. They were distributed to depths of 10 cm, but most were found in the upper 5 cm of the sediment. More than 90% of the eggs isolated from the top 5 cm successfully hatched within one month at 15 degrees C, suggesting a high viability of the eggs. The increase in egg abundance in the surface sediment and the delay in hatching during June and November demonstrates that diapause egg production occurs twice a year, i.e. in spring and late autumn. A peak in the egg abundance at depths ranging from 2 to 5 cm in June appeared to be the result of eggs produced during the spring of the previous year, indicating that the eggs had survived for at least one year in the sediment. The accumulation of the eggs in the sediment may serve as an "egg bank" that can provide an important source of nauplii for recruitment into the planktonic population of E. affinis in Lake Ohnuma

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