The vertical distributions of some copepods and a mysid in a near-shore water of Tanabe Bay
Valbonesi, A.; Harada, E. (1980). The vertical distributions of some copepods and a mysid in a near-shore water of Tanabe Bay. Publ. Seto Mar. Biol. Lab. 25(5-6): 445-460
In: Publications of the Seto Marine Biological Laboratory. Seto Marine Biological Laboratory: Wakayama. ISSN 0037-2870, more
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| Abstract |
l. Four replicate stratified plankton hauls were obtained in day and at night at two sampling sites selected in a shallow near-shore water in Tanabe Bay during July 1978 to April 1979.2. Densities of three copepods, Oithona ocellata, Pseudodiaptomus marinus and Acartia steweri, and one mysid, Anisorrrysis aikawai, were calculated from their counts and the vertical patterns of distribution were figured and compared.3. Densities fluctuated considerably with season, attaining summer maxima in Oithona ocellata and spring maxima in the rest species.4. The concentration of the population in the layers at 0--20 em from the sea bottom in the daytime and the occurrence of a large part of the population in the 50 emsurface zone at right were generally observed in the species, except Oithona ocellata. Vertical patterns in microdistribution near the sea bottom were elucidated.5. Diurnal and seasonal changes in vertical distribution were compared between species and developmental stages, and their meanings were briefly discussed. |
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