海水中の懸濁態プロテア-ゼ活性の鉛直分布および季節変動〔英文〕

概要

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The seasonal and spatial distribution of particulate protease (PPRase) activity in seawater from near to the shore to offshore areas around Japan were investigated.The activities in Aburatsubo Inlet and Tokyo Bay were from one to two orders of magnitude higher than other offshore areas, suggesting that the active biological production causes high PPRase activity in the areas. The highest activity was observed in the upper layer of all the areas (Tokyo Bay, Sagami Bay, Off-Tateyama, and Oyashio regions) and decreased with depth.In Aburatsubo Inlet, PPRase activity increased subsequently with the standing stock of primary producers from March to August and declined in the other months.The population of protease-producing bacteria ranged from 104 to 107 per l, being approximately the same order of magnitude as that of the heterotrophic bacteria. Small populations of protease-producers were observed in Sagami Bay and Off-Tateyama, whereas considerably large populations of protease-producers were found in Aburatsubo Inlet and Tokyo Bay.
社団法人日本水産学会の論文