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Predation pressure of subtidal animals on the intertidal boulder benthos community.

潮下动物对潮间带巨石底栖生物群落的捕食压力。

基本信息

批准号：
07836009
负责人：
MORI Keisuke
金额：
$ 1.15万
依托单位：
KYUSHYU UNIVERSITY
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 1996
项目状态：
已结题

项目摘要

Community structure in the intertidal and subtidal boulder shores : The fauna of intertidal community was more abundant than that of subtidal community. In the intertidal area, grazing mollusca was most dominant group. In the subtidal area, however, echinoderm and crustacea relatively increased, and filter feeder and predator were abundant. Dominant subtidal predators were sister (Itomakihitode, Asterina pectinifera), a small mollusca (Himey ouraku, Ergalatax contractus), some hermit crab and some Xanthidae decap oda crab. Except the seastar and a mollusca, their densities were very low. The main food of the seastar was algae. Therefor, I resulted that invertebrate predators in the subtidal area had little predation pressure on the intertidal community.Invasion of subtidal fish : From the diving observation of fish feeding in the intertidal area, I observed that three species of subtidal fish fed on intertidal benthos : Kasago (Sebastiscus marmoratus) Sasanohabera (Pseudolabrus japonicus), Kusafugu (Takifugu niphobles).Stomach content analysis : Invasion fishes in the intertidal area were caught by a gill net. Stomach contents were observed immediately. Kasago showed a strong preference for crustacean decapoda, however, Sasanohabera preferred mollusca. These two fishes caught in the subtidal area frequently fed intertidal benthos. Therefore, I consider that the intertidal area is an important feeding ground of subtidal fishes.

潮间带和潮下巨石岸带的群落结构：潮间带群落比潮下带群落更丰富。潮间带以食性软体动物为主。潮下带棘皮类和甲壳类相对增多，滤食性和捕食性较多。潮下捕食性天敌主要是姊妹类(Itomakihitode，Asterina putinifera)、一种小型软体动物(Himey ouraku，Ergalatax comtus)、一些寄居蟹和一些黄蜂科(Xanthidae)的食蟹。除了海星和软体动物外，它们的密度都很低。海星的主要食物是藻类。因此，笔者认为潮下带无脊椎动物捕食对潮间带群落的捕食压力很小。潮下带鱼类的入侵：通过对潮间带鱼类食性的潜水观察，观察到有3种潮下带鱼以潮间带底栖动物为食：Kasago(Sebastiscus Marmoratus)、Kasanohabera(Pseudolabus Ja Onicus)、Kusafugu(Takifugu Niphobes)。Stomach含量分析：潮间带入侵鱼被刺网捕获。即刻观察胃内容物。卡萨戈对甲壳类十足目动物表现出强烈的偏好，而萨萨诺哈贝拉则偏爱软体动物。这两种在潮下区捕获的鱼经常以潮间带底栖动物为食。因此，我认为潮间带是潮下鱼类的重要摄食地。