Abstract

We can say that studies on diversity provide knowledgeable insights into which areas with different compositions will be initially preserved or those which require more attention for government supervision. Thus, we aim to evaluate the alpha, beta and gamma diversity of the Myrtaceae assemblages as a tool for indicating priority conservation areas. Herein we explore the different levels of diversity resulting from fragments distributed along an altitudinal gradient in the Subtropical Araucaria Forest in the Santa Catarina Plateau of the Brazilian Atlantic Forest. In sequence, the Jaccard index and ordination by Detrended Correspondence Analysis were used for the β-diversity analysis and floristic substitution. Finally, the spatial dependence was analyzed by the Mantel Test based on floristic and geographical distances. Our results show that Myrtaceae assemblages along the altitude gradient are characterized by heterogeneous floristic compositions (β-diversity 0.55–0.95 variation), in which fragments above 1300 m are physiognomically marked by a predominance of the Myrceugenia and Myrcia genera. Higher altitudinal amplitude was characterized as an indicator for selecting complementary fragments due to dependence on β-diversity (r = 0.6961; p-value = 0.001), aiming at greater conservation effectiveness. In this sense, the LGS and URI complementary fragments are strategic because they comprise high beta diversity, high richness, the presence of exclusive and endemic species, and are located in different river basins. Our results show beta diversity as an effective tool for indicating priority areas for the conservation of Myrtaceae assemblages in AF, however it is essential to consider the exclusive and endemic species together.

中文翻译：

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Beta多样性作为亚热带南洋杉森林桃金娘科组合保护重点领域的指标

摘要

可以说，关于多样性的研究提供了知识渊博的见解，可以初步了解哪些成分组成不同的地区将被保留，哪些地方需要政府的监督。因此，我们旨在评估桃金娘科组合的α，β和γ多样性，作为指示优先保护区的工具。本文中，我们探索了巴西大西洋森林圣卡塔琳娜高原亚热带南洋杉森林中沿高度梯度分布的碎片所导致的不同程度的多样性。依次采用Jaccard指数和去趋势对应分析法进行β多样性分析和植物区系替代。最后，通过植物区系和地理距离的Mantel检验分析了空间依赖性。肉豆蔻和肉豆蔻属。由于依赖于β-多样性，较高的海拔振幅被表征为选择互补片段的指标（r = 0.6961； p值= 0.001），旨在提高保护效果。从这个意义上讲，LGS和URI互补片段具有战略意义，因为它们包含高β多样性，高丰富度，独特和特有物种的存在，并且位于不同的流域。我们的研究结果表明，β多样性是一种有效的工具，可用来指示AF中桃金娘科组合保护的优先领域，但是必须将排他性物种和特有物种一起考虑。