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Colonizing success of saprotrophic and ectomycorrhizal basidiomycetes on islands

机译：在岛上腐化腐生和腐生的担子菌的成功定植

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The biocliversity of saprotrophic and ectomycorrhizal basidiomycetous macrofungi growing on seven islands in central japan were compared to examine colonizing success within the context of island biogeography theory. Two hypotheses were tested: that the number of the fungal species depends on island area and that the slope of the species-area curve for saprotrophic and ectomycorrhizal macrofungi differ in response to differences in their nutritional requirements. Data for the number of species that were identified based on sporocarps closely fit the conventional species-area curve. The slopes of the species-area curve for saprotrophic fungi (0.316) and ectomycorrhizal fungi (0.469) were similar to those reported for insects and birds, and plants on other archipelagos, respectively. In addition species-area curve data showed that ectomycorrhizal fungi colonized only islands > 630 m(2). While the species composition of saprotrophic fungi found on any pair of islands was positively correlated to the ratio of the areas of the island pair being compared (smaller/larger), no such relationship was observed for ectomycorrhizal fungi. Conversely similar ectomycorrhizal fungi, mostly those belonging to the genera Amanita, Inocybe, Boletellus and Russula, were found on pairs of islands with similar vegetation in the same geographic region. These results suggested that the colonizing success by ectomycorrhizal fungi is limited by host plant diversity, which is lower on smaller islands, instead of restricted immigration resulting from limited spore dispersal ability.
机译：在岛屿生物地理学理论的背景下，比较了在日本中部七个岛屿上生长的腐生和外生菌根的担子菌类大型真菌的生物多样性，以检验殖民成功。检验了两个假设：真菌种类的数量取决于岛屿的面积，并且由于营养需求的差异，腐生性菌和外生菌根大型真菌的菌种面积曲线的斜率也不同。基于果皮确定的物种数量的数据非常符合常规物种-面积曲线。腐生真菌（0.316）和菌根真菌（0.469）的物种-面积曲线的斜率分别类似于昆虫和鸟类以及其他群岛上的植物的报道。此外，物种-面积曲线数据显示，外生菌根真菌仅在＞ 630 m（2）的岛屿上定居。虽然在任何一对岛屿上发现的腐生真菌的物种组成与所比较的岛屿对的面积比呈正相关（较小/较大），但对于外生菌根真菌，未观察到这种关系。相反地​​，在相同地理区域内成对具有相似植被的成对岛屿上发现了相似的外生菌根真菌，其中大部分属于鹅膏菌，Inocybe，Boletellus和Russula属。这些结果表明，外生菌根真菌的定殖成功受到寄主植物多样性的限制，寄主植物的多样性在较小的岛屿上较低，而不是由于孢子散布能力有限而导致的限制移民。

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