The Eocene fishes of Monte Bolca: The earliest coral reef fish assemblage
The Eocene fishes of Monte Bolca: The earliest coral reef fish assemblage
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DOI：
10.1007/s003380050025
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发表时间：
1996-02-01
期刊：
影响因子：
3.5
通讯作者：
Bellwood, DR
中科院分区：
文献类型：
--
作者：
Bellwood, DR
意大利北部Monte Bolca始新世沉积物的鱼类组合与近代珊瑚礁的鱼类组合进行了比较。一个最近的珊瑚礁鱼类组合的家庭级别的分类定义被制定，以便进行直接比较。在此基础上，Monte Bolca鱼类代表了最早的明确定义的珊瑚礁鱼类组合。鱼类科相对丰度的定量分析显示，两个组合之间存在显著差异。Bolca组合具有中生代链接（Pycnodontiformes），非表演类类群相对丰富，特别是Beryciformes （Holocentridae）。然而，Bolca代表了以表演类为主的底栖鱼类组合的最早记录（占所有非节类分类群的68.4%）。在潜形目中，主要礁鱼谱系（高鳞鱼和Labroidei）的丰度在两个组合之间明显不同。唇形鱼类在珊瑚礁上的数量优势似乎是最近才出现的。如果这确实是一个珊瑚礁鱼类组合，那么博卡鱼将对我们了解珊瑚礁鱼类的进化至关重要。然而，确定博卡鱼的地位以及博卡鱼与近代珊瑚礁之间的关系至关重要。目前这种关系尚不清楚。我们所缺乏的是一个严格的定义，什么构成了一个珊瑚礁鱼类组合，作为直接比较这两个组合的基础。关键问题是：Monte Bolca的始新世鱼类是否代表了一个珊瑚礁鱼类组合？本研究分三个阶段解决了这个问题。首先，根据现有的分类群及其数量丰度，建立了最近珊瑚礁鱼类组合的定义。其次，根据相同的分类标准确定了Bolca组合的组成。最后，利用分类学和数值资料，对博卡鱼群的现状进行了评价。
The fish assemblage from the Eocene deposits of Monte Bolca, Northern Italy, are compared with those of Recent coral reefs. A family-level taxonomic definition of a Recent coral reef fish assemblage is formulated to permit direct comparisons. On this basis, the Monte Bolca fishes represent the earliest clearly defined coral reef fish assemblage. Quantitative analyses of the relative abundance of fish families revealed significant differences between the two assemblages. The Bolca assemblage has Mesozoic links (Pycnodontiformes) and non-perciform taxa are relatively abundant, particularly the Beryciformes (Holocentridae). However, Bolca represents the earliest record of a perciform-dominated benthic fish assemblage (68.4% of all non-clupeid taxa). Within the Perciformes, the abundance of the major reef fish lineages (higher squamipinnes and Labroidei) differs markedly between the two assemblages. The numerical dominance of labroid fishes on coral reefs appears to have been a relatively recent occurrence.If indeed this is a coral reef fish assemblage, then the Bolca fishes will be of paramount importance in our understanding of the evolution of coral reef fishes. However, it is critically important to establish the status of the Bolca fishes and the relationship between the Bolca fish assemblage and those of Recent coral reefs. At present this relationship is unclear. What we lack is a rigorous definition of what constitutes a coral reef fish assemblage to act as a basis for a direct comparison between the two assemblages.The key question is: do the Eocene fishes of Monte Bolca represent a coral reef fish assemblage? This study addresses this question in three stages. Firstly, a definition of a Recent coral reef fish assemblage is established in terms of the taxa present and their numerical abundance. Secondly, the composition of the Bolca assemblage is established based on the same taxonomic criteria. And finally, using the taxonomic and numerical data, the status of the Bolca fish assemblage is appraised.