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首页> 外文期刊>Polar biology >Extreme high lichen growth rates detected in recently deglaciated areas in Tierra del Fuego
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Extreme high lichen growth rates detected in recently deglaciated areas in Tierra del Fuego

机译：在火地岛新近冰川化地区发现地衣极高的增长率

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摘要

The goals of this study were to accurately determine the annual growth rate of two key lichen species for lichenometric studies in Tierra del Fuego and to provide more information on recent glacial evolution in the southernmost mountain range of South America. The study site was located on recent moraines deposited in front of a terminus of Pia Glacier in the East Arm of Pia Bay, a fjord of the Beagle Channel. Lichenometric measurements were made of the maximum and minimum axes on the five largest thalli of Rhizocarpon geographicum and Placopsis perrugosa at selected localities in the recently deglaciated area. Average growth rates were estimated from dated surfaces to be 0.63 mm year"1 for R. geographicum and of 9.0 mm year~(-1) for P. perrugosa. However, maximum growth rate of individual thalli of P. perrugosa could be as high as about 20 mm year~(-1) increase in diameter directly measured from comparison between pictures taken over a 2-year interval. Both species had an almost linear increase in diameter size with the age of the rock surfaces and the distance from the glacier. The rapid colonization and growth of the lichens is mirrored by the higher plants with ecesis for Nothofagus trees being estimated at 4 years and height growth elongation at 30 cm year~(-1).
机译：这项研究的目的是准确确定在火地岛进行地衣计量研究的两种主要地衣物种的年增长率，并提供有关南美最南端山脉近期冰川演化的更多信息。研究地点位于比格海峡峡湾皮亚湾东臂皮亚冰川终点站前的冰rain上。地衣测量法是在最近冰期地区的选定位置，对地理根瘤菌和百日草的五个最大塔利上的最大和最小轴进行测量。从有日期的表面估计，平均生长速率为地理罗汉果（R. geoum）为0.63 mm年“ 1”，而对于斑节对虾（P. perrugosa）为9.0 mm年〜（-1）。根据在两年间隔内拍摄的照片之间的比较直接测量得出，直径增加了约20毫米（〜-1）年，这两种物种的直径大小都随着岩石表面年龄和与冰川距离的增加而几乎呈线性增加。地衣的快速定殖和生长反映在较高的植物上，Nothofagus树的盲目性估计为4年，高度生长伸长为30 cm年（-1）。

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