The Intertidal and Shallow Subtidal Food Web at Marion Island
The Intertidal and Shallow Subtidal Food Web at Marion Island
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马里恩岛潮间带和浅潮下带食物网
DOI：
10.1007/978-3-642-82275-9_86
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发表时间：
1985
期刊：
影响因子：
--
通讯作者：
J. Grindley
中科院分区：
文献类型：
--
作者：
W. Blankley;J. Grindley
根据海带鸥（Larus dominicanus, Lesser）的食物和摄食习惯，描述了马里恩岛潮间带和潮下生物的七种主要捕食者的饮食。皮喙鱼、小海参、帝王鸬鹚、长喙鱼、无鳍鱼、无鳍鱼和n。麦哲伦，掠食鱼，和海星，阿纳斯特里亚rupicola。测定了主要捕食物种的生物量和常熟作物能量值，以及捕食者的能量需求和生物量，为定量描述海洋沿海生态系统食物网的主要能量流模式提供了数据。帽贝（Nacella delesserti）是所有被捕食物种中生物量最高的，也是flarus dominicanus、Notothenia coriiceps和anasterias rupicola的主要食物，它们倾向于利用不同大小和不同栖息地的帽贝。尽管遭受了激烈的掠夺，但小藻仍保持着极高的种群密度。食物网的连通性相对较弱，并且很少有证据表明种间竞争共同的食物资源。然而，有迹象表明，种内竞争放牧发生在theN。delessertipopulation。这个系统，作为一个整体，通常是由机会主义的通才组成的，他们可以被看作是一个相对年轻和孤立的亚南极岛屿上的一组松散的相互作用的殖民者。
The diets of the seven main predators of intertidal and subtidal organisms at Marion Island are described, based on the food and feeding habits of the Kelp Gull,Larus dominicanus, Lesser.Sheathbill,Chionis minor, Imperial Cormorant,Phalacrocorax atriceps, nototheniid fish,Notothenia coriiceps, andN. magellanica, Plunder Fish,Harpagifer georgianus, and the starfish,Anasterias rupicola. The biomass and standing crop energy values of the main prey species, and the energy requirements and biomass of the predators, were determined, to yield data for a quantitative account of major patterns of energy flow in the food web of the marine coastal ecosystem. The limpet,Nacella delesserti, has the highest biomass of all the prey species and is also the major food ofLarus dominicanus,Notothenia coriiceps, andAnasterias rupicolawhich tend to exploit limpets of different sizes and from different habitats.Nacella delessertimaintains extremely high population densities despite the intense depredation. Connectivity in the food web is relatively weak, and there is little evidence for interspecific competition for common food resources. However, there are indications that intraspecific competition for grazing occurs in theN. delessertipopulation. The system, as a whole, is generally composed of opportunistic generalists which may be regarded as constituting a set of loosely interacting colonizers of a relatively young and isolated Sub-Antarctic island.