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首页> 外文期刊>Antarctic science >Dispersal of the moss Campylopus pyriformis on geothermal ground near the summits of Mount Erebus and Mount Melbourne, Victoria Land, Antarctica
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Dispersal of the moss Campylopus pyriformis on geothermal ground near the summits of Mount Erebus and Mount Melbourne, Victoria Land, Antarctica

机译：在南极维多利亚大陆的埃里布斯山和墨尔本山山顶附近的地热地面上散布青苔喜虫

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Mount Melbourne in northern Victoria Land, Antarctica, is a glaciated 2733 m volcanic cone. The moss Compylopus pyriformis occurs on two small areas of steam-warmed snow-free ground near its summit. This moss species also occurs in temperate regions world-wide, but has not been recorded elsewhere in continental Antarctica. RAPD (Random Amplified Polymorphic DNA) studies of 26 samples of C. pyriformis from two areas of heated ground on Mount Melbourne showed there was genetic diversity within the population. Genetic evidence for dispersal between the two sites, together with some genetic variation within individual colonies, indicates a single colonisation event has probably occurred at this extremely isolated location followed by multiple mutations. A single sample of moss protonema was collected 25 years ago from steam-warmed ground near the summit of another volcano, Mount Erebus (3794 m), on Ross Island some 300 km south of Mount Melbourne. The moss could not be identified based on morphological and reproductive criteria, as all attempts to differentiate it to a recognisable gametophyte were unsuccessful. The RAPD technique has now shown it to be C. pyriformis, and closely related to the population on Mount Melbourne.
机译：南极洲维多利亚州土地北部的墨尔本山为2733 m的冰川锥状火山。苔藓扁豆虫在其山顶附近的两个小面积受蒸汽加热的无雪地面上发生。这种苔藓物种也发生在世界范围内的温带地区，但尚未在南极大陆其他地方记录到。 RAPD（随机扩增多态DNA）研究来自墨尔本山两个受热地面区域的26个梨形梭菌样本，表明种群内存在遗传多样性。有关两个位点之间扩散的遗传证据，以及单个菌落内的某些遗传变异，表明单个定植事件可能发生在这个极为孤立的位置，随后发生了多个突变。 25年前，在墨尔本山以南300公里处的罗斯岛的另一座火山山顶埃里布斯（3794 m）附近的蒸汽加热的地面上采集了苔藓原生质的单个样本。无法根据形态和繁殖标准鉴定出苔藓，因为所有尝试将其区分为可识别配子体的尝试均未成功。 RAPD技术现已证明它是梨形假单胞菌，并且与墨尔本山的人口密切相关。

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