Isotopic signatures and trophic status of Ramaria
Isotopic signatures and trophic status of Ramaria
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DOI：
10.1007/s11557-010-0726-x
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发表时间：
2012-02-01
影响因子：
2.4
通讯作者：
Hobbie, Erik
中科院分区：
文献类型：
--
作者：
Agerer, Reinhard;Christan, Josef;Hobbie, Erik
Ramaria属由几个亚属组成，这些亚属通常对应于特定的营养策略。由于碳和氮同位素可以用来评估真菌的营养状况和氮源，因此我们对来自德国和其他地方的拉玛aria存档标本的同位素模式进行了广泛的调查。物种的同位素模式通常与亚属关系和不同潜在底物的范围相对应，在N-15三角洲地区，木材和凋落物上的真菌（Asteroramaria亚属和Lentoramaria亚属）的结果远低于外生菌根分类群（1千分之一12千分之一）（Ramaria亚属）或土壤上的分类群（1千分之一13千分之一）（Echinoramaria亚属）。相反，在δ C-13中，木材和凋落物上的真菌结果量（-23℃）高于土壤上的真菌结果量（27℃/千分之一），外生菌根真菌居中（24.5℃/千分之一）。在N-15条件下，定殖在矿质土壤层的真菌比同时定殖在矿质土壤和有机土壤层的真菌富集约3欧度。分类群在土壤上结果的高δ N-15和低δ C-13特征仍未得到解释。同位素特征与亚属分类和生活史特征的高保真度表明，孢子果是特定分类群碳氮循环模式的良好整合者。存档的标本代表了一个有用的生活史信息宝库，可以在不需要从其他生态系统库中获得大量支持同位素数据的情况下进行挖掘。
The genus Ramaria is composed of several subgenera that often correspond to specific trophic strategies. Because carbon and nitrogen isotopes can be used to assess fungal trophic status and nitrogen sources, we accordingly carried out an extensive survey of isotopic patterns in archived specimens of Ramaria from Germany and other locations. Isotopic patterns in species generally corresponded to subgeneric affiliations and to the range of different potential substrates, with fungi fruiting on wood and litter (subgenera Asteroramaria and Lentoramaria) much lower in delta N-15 (a parts per thousand a'3aEuro degrees) than ectomycorrhizal taxa (a parts per thousand 12aEuro degrees) (subgenus Ramaria) or taxa fruiting on soil (a parts per thousand 13aEuro degrees) (subgenus Echinoramaria). Conversely, fungi fruiting on wood and litter were higher in delta C-13 (-23aEuro degrees) than those fruiting on soil (a parts per thousand a'27aEuro degrees), with ectomycorrhizal fungi intermediate (a parts per thousand a'24.5aEuro degrees). Fungi colonizing mineral soil horizons were about 3aEuro degrees enriched in N-15 relative to those colonizing both mineral and organic horizons. The high delta N-15 and low delta C-13 signatures of taxa fruiting on soil remains unexplained. The high degree of fidelity of isotopic signatures with subgeneric classifications and life history traits suggests that sporocarps are good integrators of patterns of carbon and nitrogen cycling for specific taxa. Archived specimens represent a useful trove of life history information that could be mined without requiring extensive supporting isotopic data from other ecosystem pools.