Diel reproduction and vertical distributions of the marine cladocerans, Evadne tergestina and Penilia avirostris, in contrasting coastal environments |
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Authors: | Mullin Michael M; Onbe Takashi |
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Institution: | 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 |
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Abstract: | Evadne tergestina and Penilia avirostris were sampled duringseveral diel cycles in the well-mixed, turbid Inland Sea ofJapan and the more stratified, less turbid Gulf of Mexico shelf.Parthenogenetic female Evadne contained embryos with pigmentedeyes only at night, and apparently released neonates near dawnor in the morning. There was no significant diel vertical migrationin the Gulf of Mexico, and a reverse migrationin the Inland Sea. Female Penilia could contain mature embryosat any time, but were most likely to do so at night. Peniliadid not migrate dielly, and in the Gulf of Mexico was concentratedin a nepheloid layer near the bottom. |
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