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首页> 外文期刊>Marine ecology progress series >Structure of patch-reef fish assemblages at St. Croix, US Virgin Islands, and One Tree Reef, Australia
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Structure of patch-reef fish assemblages at St. Croix, US Virgin Islands, and One Tree Reef, Australia

机译：美属维尔京群岛圣克鲁斯和澳大利亚一棵礁石的礁石鱼群结构

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摘要

The structure and dynamics of reef fish assemblages on small patch reefs in the Caribbean (St. Croix, US Virgin Islands) were compared with those studied previously (Sale et al. 1994) on the Great Barrier Reef (One Tree Reef), Australia, in order to test whether assemblage structure and function are consistent despite overall taxonomic differences. St. Croix reefs were monitored over 5 yr (1991 to 1996), while those at One Tree Reef had been monitored for 10 yr (1977 to 1986). Analyses of species richness and abundances for individual patch reef assemblages revealed considerable change in assemblage structure between censuses. Specifically, number of individuals and species varied among summer and winter censuses, with summer censuses generally showing greater numbers. Among years but within a season, there was significant variation in the number of individuals (summer and winter) and species richness (summer only) at St. Croix, while only species richness varied yearly (summer and winter) at One Tree Reef. In addition, when the proportional abundances of species observed on each patch reef were compared among censuses on the same patch reefs but at different times (measured as Czekanowski similarity values), results indicated that faunal similarity declined with increasing length of interval between censuses. The mean, between-census Czekanowski similarity values for individual assemblages were 0.56 and 0.59 for St. Croix and One Tree Reef, respectively. These results suggest that there is substantial temporal change in assemblage structure at both locations. Species in each location were classified into 12 trophic guilds in order to determine whether the assemblages at St. Croix and One Tree Reef showed similar trophic structure despite different species present. Results indicated that guild structure varied among censuses in both locations and that average guild structure differed substantially between these locations. At St. Croix, diurnal and nocturnal planktivores were proportionately more important, while site-attached herbivores, wide-ranging grazing herbivores, wide-ranging browsing herbivores, sedentary carnivores, and demersal planktivores were proportionately more important on the Australian patch reefs. Results confirm that comparable assemblage dynamics occur for patch reef assemblages at St. Croix and One Tree Reef. However, there are also clear differences in structure and dynamics in these 2 locations, despite the very similar physical and hydrographic habitats occupied.
机译：比较了加勒比海（美属维尔京群岛圣克鲁斯）小片礁上的礁鱼组合的结构和动力学，并将其与先前在澳大利亚大堡礁（One Tree Reef）上研究的Sale等（1994）进行了比较。为了测试装配结构和功能在整体分类学上是否存在差异，是否一致。对圣克鲁瓦礁进行了5年（1991年至1996年）的监测，而对一树礁的礁石进行了10年（1977年至1986年）的监测。对单个斑块礁组合的物种丰富度和丰度分析表明，普查之间组合结构发生了很大变化。具体而言，夏季和冬季普查之间的个体和物种数量有所不同，夏季普查通常显示出更大的数量。在数年之内但在一个季节之内，圣克鲁瓦的个体数量（夏季和冬季）和物种丰富度（仅夏季）存在显着差异，而在一个树礁，物种丰富度每年（夏季和冬季）都发生变化。此外，当在同一块礁石上但在不同时间的普查中比较每个斑块礁上观察到的物种的比例丰度时（以Czekanowski相似性值衡量），结果表明，随着普查间隔时间的延长，动物群相似性下降。单个集合的平均人口普查间Czekanowski相似性值对于圣克鲁瓦和一棵树礁分别为0.56和0.59。这些结果表明，在两个位置上的装配结构都存在很大的时间变化。为了确定尽管存在不同的物种，圣克罗伊岛和One Tree Reef的组合是否都显示出相似的营养结构，所以将每个位置的物种分为12个营养协会。结果表明，在两个地点的人口普查中，行会结构各不相同，并且在两个地点之间，平均行会结构也存在很大差异。在圣克鲁瓦，日间和夜间浮游动物在比例上更为重要，而在澳大利亚的斑块珊瑚上，按地点附着的食草动物，范围广泛的放牧食草动物，浏览范围广泛的食草动物，久坐的食肉动物和海底浮游动物在比例上更为重要。结果证实，在圣克鲁瓦和一棵树礁，贴片礁组合发生了可比的组合动力学。但是，尽管所占据的物理和水文生境非常相似，但这两个位置在结构和动力上也存在明显差异。

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