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首页> 外文期刊>Climatic Change >Fern species richness and abundance are indicators of climate change on high-elevation islands: evidence from an elevational gradient on Tahiti (French Polynesia)
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Fern species richness and abundance are indicators of climate change on high-elevation islands: evidence from an elevational gradient on Tahiti (French Polynesia)

机译：蕨类物种的丰富度和丰富度是高海拔岛屿气候变化的指标：塔希提岛（法国波利尼西亚）海拔梯度的证据

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Inherent characteristics of island species make them particularly susceptible to anthropogenic changes and need to be assessed to implement appropriate conservation strategies. The impacts of climate change are increasingly being investigated along elevational gradients since they provide natural laboratories to study how species respond to climatic variation. Ferns are particularly sensitive to air humidity and temperature and are therefore potentially useful as bio-indicators. This study addresses the question of whether the distributions of fern species richness and abundance have climatic correlates along an elevational gradient on the tropical volcanic island of Tahiti (French Polynesia). Analyses were conducted on two datasets: island-wide richness was estimated using published data on species elevational ranges, and local richness and abundance were addressed through a transect survey. Correlations with water availability, temperature, area availability, and a randomly-generated species richness pattern were investigated. Results showed that both diversity and abundance varied in association with climate. Rainfall was collinear with diversity in the lower half of the elevational gradient (R-2 = 0.97), while temperature was the most important climatic correlate for diversity in the upper half (R-2 = 0.98). The number of terrestrial fern individuals and epiphytic fern cover were both correlated with temperature (R-2 = 0.86 and 0.81, respectively). Our results imply that impacts of climate change on ferns on Tahiti might include change in diversity and abundance, and increased extinction risk due to low overlap between current and projected species distributions. Ferns represent important indicator organisms that can be used to study species distributional responses to climate change in island ecosystems.
机译：岛屿物种的固有特征使其特别容易受到人为改变的影响，因此需要对其进行评估以实施适当的保护战略。由于气候变化的影响提供了自然实验室来研究物种对气候变化的响应方式，因此越来越多地沿着海拔梯度研究气候变化的影响。蕨类植物对空气湿度和温度特别敏感，因此有可能用作生物指示剂。这项研究解决了热带塔希提岛（法属波利尼西亚）上蕨类植物物种丰富度和丰富度的分布是否沿海拔梯度具有气候相关性的问题。对两个数据集进行了分析：使用已发布的物种海拔范围数据估算了全岛的丰富度，并通过样带调查解决了当地的丰富度和丰度。研究了与水可利用性，温度，面积可利用性和随机产生的物种丰富度模式的相关性。结果表明，多样性和丰度都随气候而变化。降雨与海拔梯度下半部分的多样性共线（R-2 = 0.97），而温度是上半部分多样性的最重要的气候相关因素（R-2 = 0.98）。陆生蕨类植物个体的数量和附生蕨类植物的覆盖率均与温度相关（R-2分别为0.86和0.81）。我们的结果表明，气候变化对塔希提岛蕨类植物的影响可能包括多样性和丰度的变化，以及由于当前物种分布与预计物种分布之间的重叠少而导致的灭绝风险增加。蕨类植物是重要的指示生物，可用于研究岛屿生态系统中物种对气候变化的分布响应。

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