Distribution and variation of alkaline phosphatase activity and phosphatase-hydrolyzable phosphorus in coastal seawaters [Japanese]

摘要

In eutrophic coastal environments in Japan, red tides have caused mass mortality of cultured and wild fish. Some of the red tide phytoplanktons can produce alkaline phosphatase (AP) under low ambient phosphate concentration, which suggests that such phytoplankton can utilize phosphatase-hydrolyzable phosphorus in the water as a phosphorus source. In the present study, the distribution and variation of AP activity and AP-hydrolyzable phosphorus (APHP) in coastal seawater was examined to elucidate the contribution of organic phosphorus to the growth of red tide phytoplankton.