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首页> 外文期刊>Polar biology >Abundance, richness, and succession of microfungi in relation to chemical changes in Antarctic moss profiles
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Abundance, richness, and succession of microfungi in relation to chemical changes in Antarctic moss profiles

机译：微真菌的丰度，丰富度和演替与南极苔藓剖面中化学变化的关系

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摘要

Little is known in continental Antarctic about patterns of abundance, diversity, and succession of microfungi within moss profiles consisting of live, senescent, and dead tissues in different stages of decomposition. In the present study, vertical patterns of the abundance and diversity of microfungi and their relationship with chemical compositions were examined within moss colonies collected from coastal outcrops in the Lutzow-Holm Bay area (Queen Maud Land), East continental Antarctica. Total and darkly pigmented hyphal length, the richness of molecular operational taxonomic units (MOTUs) of microfungi, and the occurrence of Phoma herbarum and Pseudogymnoascus pannorum increased with the depth of moss profiles. The content of organic chemical components and nitrogen in moss tissues decreased, whereas ash content increased with the depth of moss profiles. Relative amount of recalcitrant compounds and total carbohydrates did not significantly differ among the vertical layers. The downward increase of the microfungal richness and occurrence in the Antarctic moss profiles without MOTU replacement was consistent with the directional-nonreplacement model of succession, indicative of the high environmental resistance, which represents the sum of the adverse factors hindering the success of species establishment. This contrasted with the fungal succession in arctic moss profiles, which accorded with the directional-replacement model, in which species replacement took place due to modification of habitat and competition. More hostile environmental conditions than those in the Arctic characterized the fungal succession and limited the fungal decomposition of moss in continental Antarctica.
机译：在南极大陆上关于由不同分解阶段的活组织，衰老组织和死组织组成的苔藓剖面内微真菌的丰度，多样性和演替模式知之甚少。在本研究中，在南极东部大陆卢茨霍姆湾地区（昆士兰州莫德地区）从沿海露头收集的苔藓菌落中检查了微真菌的丰富度和多样性的垂直模式及其与化学成分的关系。总的和深色的菌丝长度，微真菌的分子操作生物分类单位（MOTU）的丰富度以及发草和变色假单胞菌的发生都随苔藓深度的增加而增加。苔藓组织中有机化学成分和氮的含量降低，而灰烬含量随苔藓深度的增加而增加。竖向层之间顽固性化合物和总碳水化合物的相对量没有显着差异。在不进行MOTU替代的情况下，南极苔藓微真菌丰富度的下降和发生与演替的定向非替代模型一致，表明其具有较高的环境抵抗力，代表了阻碍物种成功建立的不利因素之和。这与北极苔藓轮廓上的真菌演替形成对照，后者符合定向替换模型，在该模型中，由于栖息地和竞争的改变而进行了物种替换。与北极相比，南极洲大陆上的真菌演替具有更大的敌对环境条件，并限制了苔藓的真菌分解。

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