Fundametal Reseach for the Preservation of Coral Reefs

珊瑚礁保护基础研究

基本信息

批准号：
07680609
负责人：
NOJIMA Satoshi
金额：
$ 1.47万
依托单位：
KYUSHU UNIVERSITY (1997)Kumamoto University (1995-1996)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

项目摘要

1.I set 20-40 plates at 10 study areas around Sesoko Island in May, 1997 as same as 1995 and 1996. These plates were collected in September (3 months after setting), and the number of species and the number of individuals were counted in each plate. The most abundant species belong to the genus Acropora occupied over 95% of the total, subordinally species of Pocilloporide, such as Stylophora and pocillopora, were abundant. Juveniles of Porites were rarely observed. This monitoring has been continued from 1989 for 9 years. The most dense settlement, 10,000-30,000/m^2 was observed in 1996 and this was caten times of the normal density. However, the density of settlement returned to the normal density.2.The population structure of the two dominant species, Acropora hyacinthus and A.digitifera, were studied and analyzed in several areas. The size of main year class of the populations in recoveing areas were different each other. This fact seems to implicate that the years of dominant spats … More set were different each other.3.The relationship between the sea urchins, genus Echinometra, and the density of juvenile corals was studied for analyzing the grazing effect of the sea urchin. The convex relationship was seen between the density of juvenile corals and the density of sea urchin in 1996. However, opposite result, i.e.a concave relationship was observed in 1997, namely the density of juvenile corals was high both at low density and high density of the sea urchin.4.The predation effect of Acanthaster planci on the population structure of A.hyacinthus was studied using the coral communities both in an enclosure (sea star free) and in the surrounding area (sea star area). Attack of the sea star was intensive around the enclosure (sea star area) in 1996, so that the density and the population structure were suddenly changed in the surrounding area. However, the continuous strucure was observed on the population in the enclosure.The results of other experiments are analyzing now. Less

1.与1995年和1996年一样，我于1997年5月在濑底岛周围的10个研究区域设置了20-40个板块。这些板块是在9月份（设置后3个月）收集的，物种数和个体数每个板块中最丰富的物种属于鹿角珊瑚属，占 Pocilloporide 下属物种总数的 95% 以上，例如柱形珊瑚 (Stylophora)。滨珊瑚的幼体数量很少，从 1989 年开始监测已持续 9 年，1996 年观察到最密集的沉降量为 10,000-30,000 个/m^2，是正常密度的倍数。但聚落密度恢复到正常密度。2.鹿角卫城两个优势种Acropora hyacinthus和A.digitifera的种群结构对多个地区的研究和分析发现，恢复地区种群的主要年份类别大小不同，这一事实似乎表明，种群的优势年份彼此不同。 3. 之间的关系。为分析海胆的摄食效应，对海胆、海胆属和幼年珊瑚的密度进行了研究，发现幼年珊瑚的密度与海胆的密度之间存在凸关系。 1996年却出现了相反的结果，即1997年观察到了凹关系，即海胆低密度和高密度下幼珊瑚的密度都较高。4.棘螈对刺螈种群结构的捕食作用。使用围栏（无海星）和周围区域（海星区域）的珊瑚群落对风信子进行了研究，海星的攻击在围栏周围（海洋）非常密集。 1996年的星区），使得周围区域的密度和种群结构发生了突然的变化，但在围圈内观察到了连续的结构。目前其他实验的结果正在分析。