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Community organization of associates of the scleractinian coral Pocillopora damicornis

石珊瑚类珊瑚 Pocillopora damicornis 的群落组织

基本信息

批准号：
01540551
负责人：
TSUCHIYA Makoto
金额：
$ 1.22万
依托单位：
University of the Ryukyus
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1991
项目状态：
已结题

项目摘要

Colony size and the inter and intraspecific interactions of the obligate symbionts of Pocillopora damicornis, i. e. xanthid crabs(Trapezia app.), a snapping shrimp(Alpheus lottini)and gobies(Paragobiodon app.), are examined in terms of their effects on the community structure of the coral associates. Species richness and diversity(H')and the number of associated animals increased with colony size, while eveness(J')was constant and high. In colonies with less than 1.5 cm3 interbranch space volume, no obligate symbionts were found. Obligate symbiont species and numbers increased with colony size : 1.5-12 cm3 --one individual of Trapezia or Cymo ; 15-23 cm3 --2 species, one individual each ; 24-71 cm3 --2 species including one heterosexual pair pf Trapezia or Paragobiodon ; 74-264 cm3 -- 2 or 3 species including 2 6r 3 heterosexual pairs ; . 331 cm3 --more than 4 species forming complex communities(maximum of 10 species in a colony of 1, 980 cm3). Females of Trapezia cymodoce expelled all introduced smaller individuals of Trapezia spp., but were frequently expelled by larger introduced crabs. Alpheus lottini sometimes expelled introduced Trapezia, but Trapezia rarely showed aggressive behavior toward A. lottini. A. lottini is most aggressive against conspecific intruder of the same sex, resulting in the occurrence of one heterosexual pair per colony. Carrying capacity of the habitat which is related to colony size, and species interactions between the residents and intruders are important factors in the organizing process of the associated animals community.

根据珊瑚群落结构的影响，研究了poillopora damicornis的专一共生体，即黄原蟹（Trapezia）、虾蛄（Alpheus lottini）和虾虎鱼（Paragobiodon）的群落大小和种内和种间的相互作用。物种丰富度和多样性（H′）及伴生动物数量随群落规模的增大而增加，而均匀度（J′）保持较高且不变。在枝间空间小于1.5 cm3的菌落中，未发现专性共生体。专性共生体的种类和数量随群体大小而增加：1.5-12 cm3—一个Trapezia或Cymo个体；15- 23cm3——2种，各一个个体；24-71 cm3 -2种，包括一对异性恋的斜足类或副齿类；74-264 cm3——2或3种，包括2 63对异性恋；． 331 cm3——超过4种形成复杂群落（在1980 cm3的群落中最多有10种）。雌性会驱逐所有引进的小蟹，但会经常被引进的大蟹驱逐。Alpheus lottini有时会驱逐引进的Trapezia，但Trapezia很少对A. lottini表现出攻击行为。A. lottini对同性别的入侵者最具攻击性，导致每个群体出现一对异性伴侣。栖息地的承载能力（与群落大小有关）和物种间的相互作用是伴生动物群落组织过程中的重要因素。