Taxonomic, phylogenetic and functional diversities of ferns and lycophytes along an elevational gradient depend on taxonomic scales
Taxonomic, phylogenetic and functional diversities of ferns and lycophytes along an elevational gradient depend on taxonomic scales
复制标题
蕨类植物和石松植物沿海拔梯度的分类学、系统发育和功能多样性取决于分类尺度
DOI：
10.1007/s11258-015-0543-z
复制
发表时间：
2015
期刊：
影响因子：
1.7
通讯作者：
Takayuki Tanaka & Toshiyuki Sato
中科院分区：
文献类型：
--
作者：
Takayuki Tanaka & Toshiyuki Sato
我们评估了系统发育和功能的蕨类植物和石松植物沿着海拔梯度在日本中部，并评估了分类尺度的影响，上述diform和支持的生态位保守假说。我们的数据集是基于植物标本馆标本和广泛的领域采样蕨类植物和石松植物集成到300米的海拔梯度的间隔。系统发育和功能的diform评估使用标准化的影响大小的饶二次熵指数依赖于系统发育的规模，特别是石松的包容性。在蕨类植物和多足类中，系统发育多样性没有随海拔变化的趋势，功能多样性在低海拔和高海拔分别表现为过度分散和聚集;然而，蕨类植物和石松植物的系统发育多样性在蕨类植物和多足类中表现出相反的模式，尽管分类多样性表现出相似的模式。这些结果表明，系统发育和功能的多样性的影响所包括的群体的变量的进化历史。环境过滤支持蕨类植物和多足类的功能多样性模式，但系统发育多样性没有显示出趋势。这表明，在本研究中检查的形态和生活史特征独立地在不同的谱系中进化。蕨类植物的平均家系年龄只沿沿着海拔梯度递减的模式支持生态位保守性假说，然而，蕨类植物和石松和多足类的模式不支持这一假说。这些结果表明，平均家庭年龄是敏感的分类特定的历史和重点分类规模，虽然生态位保守性可能有助于生物多样性格局沿着海拔梯度。
We evaluated the phylogenetic and functional diversities of ferns and lycophytes along an elevational gradient in central Japan and assessed the influence of taxonomic scales on the aforementioned diversities and support for the niche conservatism hypothesis. Our dataset was based on herbarium specimens and broad field sampling of ferns and lycophytes integrated into 300-m intervals of elevational gradient. Phylogenetic and functional diversities evaluated using the standardised effect sizes of the Rao quadratic entropy index depended on the phylogenetic scale, particularly the inclusiveness of lycophytes. In ferns only and polypods, phylogenetic diversity showed no trends with elevation, and functional diversity at lower and higher elevations showed over-dispersion and clustering, respectively; however, those diversities of ferns and lycophytes showed a contrasting pattern in ferns only and polypods, although taxonomic diversity showed similar patterns. These results suggest that phylogenetic and functional diversities were affected by the variable evolutionary history of included groups. The patterns of functional diversities of ferns only and polypods were supported by environmental filtering, although phylogenetic diversity showed no trends. This suggests that morphological and life-history traits examined in the present study independently evolved in various lineages. The decreasing pattern of the mean family age in ferns only along an elevational gradient supported the niche conservatism hypothesis; however, the patterns in ferns and lycophytes and polypods did not support this hypothesis. These results suggest that the mean family age is susceptible to taxon-specific history and focal taxonomic scale, although niche conservatism may contribute to biodiversity patterns along elevational gradients.