Studies on formation of subtidal biological communities on a quay wall constructed in rocky shore area

月季是日本浅海常见的藤壶，已被测试为在日本北部冈桥湾码头形成潮下生物群落的关键物种。结果表明，在冬季水温与常年持平或高于常年的冬季，对大型藻类的沉降有促进作用，而在气温较低的年份则没有促进大型藻类的定居。它还增强了测试板上更高的生物多样性，因为它的贝壳形成了更大的面积和表面轮廓。但在这项实验中，藤壶直到明年才存活下来。光球海藻是该地区常见的海生生物，对岩岸剥蚀型试验板的生物群落有显著影响。该物种表现出起伏取食活动，最大摄食量为0.53克(干重)/天，最大摄食量为15℃。为了在该地区潮下带形成或恢复生物群落，消灭或扑杀这种海胆似乎是必不可少的。

Megabalanus rosa, a common barnacle in shallow waters in Japan, has been tested to be a key species to form subtidal biological communities on the quay wall in Okkirai Bay, northern Japan. As a results, it enhanced settlement of macro-algae during winter season when water temperature in winter being even or higher than average year, but not on a year with lower temperature. It also enhanced higher biodiversity on the test plates due its greater area and surface contour formed by its shells. But the barnacle did not survive until next year in this experiments. Strongylocentrotus nudus, a common seaurchin in this area, had significant effects on biological communities of test plates like a rocky-shore denudation. This species showed up-and-down feeding activity, and fed 0.53g (dry weight) a day at 15℃ in maximum. Elimination or cull for this seaurchin seemed to be indispensable to form or recover biological communities in the subtidal zone in this area.