Interference Compoetition Structures Habitat Use in a Local Assemblage of Coral Reef Surgeonfishes
Interference Compoetition Structures Habitat Use in a Local Assemblage of Coral Reef Surgeonfishes
复制标题
干扰竞争结构在珊瑚礁刺鱼的局部组合中的栖息地利用
作者：
D. R. Robertson;S. Gaines
我们研究了食物和栖息地的使用关系成对干扰的相互作用之间的所有13种的surgeonfish组合，生活在一个0.225公顷的部分在阿尔达布拉，印度洋的堡礁的外缘。11种捍卫饲养领土内，在大多数情况下，种间。外科鱼类物种对分为两类：（1）noninteractors（n = 38对）很少相互竞争，和两个物种的个人和平地共享喂养区;（B）interactors（n = 27对）通常相互竞争，每当他们见面，除了在特殊情况下，没有共享喂养区。间的支配关系？参与者通常是高度不对称的，只有一对参与者没有明显的支配/从属关系。相互作用者之间的饮食重叠较高，大规模的栖息地重叠低于noninteractors之间。此外，在对相互作用与高大规模的栖息地重叠，我们发现小规模的栖息地隔离。相互作用没有不同的noninteractors在一对物种之间的身体大小的相似程度。互惠去除实验进行的一个营养子集的组合表明，竞争从属物种很容易接管空置的栖息地先前占据的竞争优势物种，但很少发生相反的情况。这些数据支持的假设，干扰竞争的食物起着一部分，在结构化的组合，通过确定许多空间分布格局，并促进栖息地之间的食物竞争对手的分区。我们的数据表明，这种竞争的存在或不存在可能会影响该组合中60-80%的栖息地-使用关系。
We examined use of food and habitat in relation to pairwise interference interactions among all 13 species of a surgeonfish assemblage that lived in a 0.225-ha section ofthe outer edge of the barrier reef at Aldabra, Indian Ocean. Eleven species defended feeding territories intraspecifically and, in most cases, interspecifically. Surgeonfish species pairs fell into two classes: (1) noninteractors {n = 38 pairs) rarely interacted agonistically, and individuals of the two species peacefully shared feeding areas; (b) interactors {n = 27 pairs) typically interacted agonistically whenever they met, and, except under special circumstances, did not share feeding areas. Dominance relations between inter? actors usually were highly asymmetrical, and in only one pair was there no evidence of a dominant/ subordinate relationship. Between interactors diet overlap was higher and large-scale habitat overlap was lower than between noninteractors. In addition, within pairs of interactors with high large-scale habitat overlap, we found small-scale habitat segregation. Interactors did not differ from noninteractors in the extent of similarity in body size between the species in a pair. Reciprocal removal experiments performed with one trophic subset of the assemblage showed that agonistically subordinate species readily took over vacant habitat previously occupied by agonistically dominant species, but that the reverse rarely occurred. These data support the hypothesis that interference competition for food plays a part in structuring the assemblage, by determining many spatial distribution patterns, and promotes habitat partitioning among food competitors. Our data indicate that the presence or absence of such competition may affect 60-80% of habitat-use relationships in that assemblage.