Body size, reef area and temperature predict global reef-fish species richness across spatial scales
Body size, reef area and temperature predict global reef-fish species richness across spatial scales
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DOI：
10.1111/geb.12851
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发表时间：
2019-03-01
影响因子：
6.4
通讯作者：
Floeter, S. R.
中科院分区：
文献类型：
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作者：
Barneche, D. R.;Rezende, E. L.;Floeter, S. R.
目的研究不同空间尺度下生物和非生物对礁鱼物种丰富度的影响。分布于地球仪的热带珊瑚礁，包括分布于14个地理省的109个分省的485个地点。存在时间段。主要分类群研究了2，523种珊瑚鱼。方法我们编制了一个数据库，包括13,050视觉横断面。我们使用分层线性贝叶斯模型来调查鱼体大小，珊瑚礁面积，隔离，温度和人为影响是否与每个空间尺度上的珊瑚礁鱼类物种丰富度相关（即，地点、分省、省）。使用基于覆盖率的稀疏估计丰富度。我们还测试了物种包装（即，样带水平物种丰富度/m（2））与省级丰富度相关。结果在3个空间尺度上，个体大小对物种丰富度的影响最大。生物礁面积和温度都与丰富度在所有空间尺度呈正相关。在现场规模，丰富度下降与礁隔离。物种丰富度与人类影响的代理不相关。物种填充与物种丰富度在省级水平上呈次线性幂函数关系。省级物种丰富度的差异也反映了在网站规模的体型分布模式。物种丰富的省份表现出异质组合的小体型的物种与小范围的大小，而物种贫乏的省份包括均匀的组合组成的较大的物种具有更大的扩散能力。主要结论我们的研究结果表明，身体大小分布，珊瑚礁面积和温度是物种丰富度和跨尺度积累的主要预测因子，与最近的理论相一致，将家域与物种面积关系以及对物种形成率的代谢效应联系起来。根据我们的研究结果，我们假设，在多样性较低的地区，物种更大，可能更分散，导致更大的范围大小和网站之间的营业额较少。我们的研究结果表明，省一级的变化（即，区域）的丰富性应该留下一个易于处理的指纹在当地的组合，并详细研究当地规模的组合组成可能是信息的反应发生在更大的规模。
Aim To investigate biotic and abiotic correlates of reef-fish species richness across multiple spatial scales. Location Tropical reefs around the globe, including 485 sites in 109 sub-provinces spread across 14 biogeographic provinces. Time period Present. Major taxa studied 2,523 species of reef fish. Methods We compiled a database encompassing 13,050 visual transects. We used hierarchical linear Bayesian models to investigate whether fish body size, reef area, isolation, temperature, and anthropogenic impacts correlate with reef-fish species richness at each spatial scale (i.e., sites, sub-provinces, provinces). Richness was estimated using coverage-based rarefaction. We also tested whether species packing (i.e., transect-level species richness/m(2)) is correlated with province-level richness. Results Body size had the strongest effect on species richness across all three spatial scales. Reef area and temperature were both positively correlated with richness at all spatial scales. At the site scale only, richness decreased with reef isolation. Species richness was not correlated with proxies of human impacts. Species packing was correlated with species richness at the province level following a sub-linear power function. Province-level differences in species richness were also mirrored by patterns of body size distribution at the site scale. Species-rich provinces exhibited heterogeneous assemblages of small-bodied species with small range sizes, whereas species-poor provinces encompassed homogeneous assemblages composed by larger species with greater dispersal capacity. Main conclusions Our findings suggest that body size distribution, reef area and temperature are major predictors of species richness and accumulation across scales, consistent with recent theories linking home range to species-area relationships as well as metabolic effects on speciation rates. Based on our results, we hypothesize that in less diverse areas, species are larger and likely more dispersive, leading to larger range sizes and less turnover between sites. Our results indicate that changes in province-level (i.e., regional) richness should leave a tractable fingerprint in local assemblages, and that detailed studies on local-scale assemblage composition may be informative of responses occurring at larger scales.