Ecological diversification among nine species of Pohlia (Musci) in western North America
Ecological diversification among nine species of Pohlia (Musci) in western North America
复制标题
北美西部九种 Pohlia (Musci) 的生态多样性
作者：
A. J. Shaw
九种北美Pohlia，组Pohliella，形成一个复杂的形态和生态相似的物种。在北美洲西部，有一个广泛的地理范围重叠的区域，它们经常以各种组合生长在一起。超过300个代表这些物种的土壤样品进行了分析，有机质含量，pH值，交换性钙和镁离子的浓度，并发现每个物种在这些环境因素是独特的。形态可变的物种往往在生态和地理上分布广泛，而变异较小的物种往往受到更多的限制。原始形态特征占优势的物种主要出现在中间pH值的苔原土壤，而形态先进的物种栖息在路边银行或其他干扰网站的pH值可能是高或低。
Nine North American species of Pohlia, section Pohliella, form a complex of morphologically and ecologically similar species. In western North America, where there is a broad region of overlap in geographic ranges, they frequently grow together in various combinations. Over 300 soil samples representative of these species were analyzed with respect to organic matter content, pH, and concentrations of exchangeable calcium and magnesium ions, and each species was found to be distinctive in terms of these environmental factors. Morphologically variable species tend to be ecologically and geographically widespread, while less variable species tend to be more restricted. Species with a predominance of primitive morphological features occur primarily on tundra soils of intermediate pH, while morphologically advanced species inhabit road banks or other disturbed sites where the pH may be high or low.