open access

https://hdl.handle.net/2115/38884

Seasonal Abundance of Oithona (Copepoda, Cyclopoida) in Funka Bay, Hokkaido

日本語

reproduction

2003-11

Japanese Society of Fisheries Oceanography

Bulletin of the Japanese Society of Fisheries Oceanography

67(4)

235-243

In order to elucidate the seasonal change in abundance of Oithona (Copepoda, Cyclopoida), monthly samplings were conducted from April 1999 to June 2000 at the center of Funka Bay, Hokkaido. After the intrusion of the Oyashio Coastal Water, spring bloom occurred and large sized phytoplankton (≧10μm) increased rapidly. In the surface layer (15m depth), Oithona nauplii dominated in the community of copepod nauplii in the bay throughout the year except in August. NI of them was abundant throughout the year except in April. The population density of Oithona nauplii decreased from November 1999 to March 2000. Then they increased from April to June 2000 and the maximum abundance was observed in May (30m depth, 47.3 inds.・l^[-1]).The vertical distribution of Oithona similis copepodids, which were dominated in the Oithona community, was related to small sized phytoplankton (<10μm), naked flagerates, and naked ciliates from October 1999 to June 2000. The results suggest that the biological production of Oithona similis was supported by the microplankton in the microbial food web in Funka Bay.

学術雑誌論文

Version of Record

0388-9149

AN10063434