JOURNAL OF PLANKTON RESEARCH | VOLUME 14 | NUMBER 1 | PAGES 41-59 | 1992
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research-article |
Diel reproduction and vertical distributions of the marine cladocerans, Evadne tergestina and Penilia avirostris, in contrasting coastal environments
Marine Life Research Group, Scripps Institution of Oceanography La Jolla, CA 92093-0227, USA 1Faculty of Applied Biological Science, Hiroshima University Shitami, Saijo-cho HigashiHiroshima 724, Japan
Received on August 11, 1990; accepted on June 3, 1991 Evadne tergestina and Penilia avirostris were sampled during several diel cycles in the well-mixed, turbid Inland Sea of Japan and the more stratified, less turbid Gulf of Mexico shelf. Parthenogenetic female Evadne contained embryos with pigmented eyes only at night, and apparently released neonates near dawn or in the morning. There was no significant diel vertical migration in the Gulf of Mexico, and a reverse migration in the Inland Sea. Female Penilia could contain mature embryos at any time, but were most likely to do so at night. Penilia did not migrate dielly, and in the Gulf of Mexico was concentrated in a nepheloid layer near the bottom.
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