ABSTRACT

Introduction.

Ditrichum plumbicola Crundw. is a rare metallophyte that is threatened with global extinction. In this study, its population status and ecology on the Isle of Man were investigated.

Methods.

Surveys were carried out at all sites where the species may currently occur. Geographical coordinates of colonies were recorded using a GPS unit and counts made of occupied 1 m grid cells. Habitat and community composition were recorded by relevés. The chemical composition of occupied soil was also ascertained.

Key results and conclusions.

Two subpopulations of the species have occurred, associated with the two main ore bodies on the island. One of the subpopulations has become extinct. The other subpopulation comprises colonies at four nearby disused metal mines. It occurs at each in small quantity, with a total population of 47 occupied 1 m grid cells. The species is confined to open metalliferous spoil with high concentrations of lead. Solenostoma gracillimum is the only frequent associate. Management intervention to re-expose open metalliferous spoil will be required ultimately to save the species from extinction.

中文翻译：

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全球受威胁的苔藓 Ditrichum plumbicola Crundw 的种群状况和生态学。在马恩岛

摘要

介绍。

Ditrichum plumbicola Crundw。是一种濒临全球灭绝的稀有金属植物。在这项研究中，调查了它在马恩岛的种群状况和生态。

方法。

在该物种目前可能出现的所有地点都进行了调查。使用 GPS 单元记录菌落的地理坐标，并对占用的 1 m 网格单元进行计数。栖息地和社区组成由 relevés 记录。还确定了占用土壤的化学成分。

主要结果和结论。

该物种的两个亚种群已经出现，与岛上的两个主要矿体有关。其中一个亚种群已经灭绝。另一个亚群包括附近四个废弃金属矿的殖民地。每次出现数量较少，总种群数量为47个，占据1m的网格单元格。该物种仅限于含高浓度铅的开放式含金属弃土。Solenostoma gracillimum是唯一常见的伙伴。最终需要进行管理干预以重新暴露开放的含金属弃土，以挽救该物种免于灭绝。