Driftwood is woody debris that is floating on the sea or brought onto the shore by the sea. It can have a natural origin but often it originates from human activities. Driftwood has a significant ecological role as a microhabitat for a large range of species. Dead‐wood‐associated aphyllophoroid fungi on driftwood have been studied rather little globally, and there are hardly any studies conducted in the Baltic Sea. We studied the diversity and ecology of polypores and corticioids growing on driftwood (man‐made logs) on the shores of the Finnish SW‐archipelago. In total, 394 driftwood logs were surveyed for visible fungal sporocarps. We found altogether 145 species (1023 records) of which approximately three‐fourths were corticioids. The driftwood logs hosted several rare and noteworthy species, such as one new corticioid species, 16 nationally rare species, and 40 new species to the region. The five most common species accounted for one‐third of all observations, whereas 82 species (11% of all records) were recorded only once or twice. Larger logs hosted, on average, more species compared to small‐diameter logs. The mean number of species increased significantly when comparing the logs in the first and the middle stages of decay. Our results show that driftwood logs can host a wide variety of species and they provide an important substrate for many dead‐wood‐associated fungi, including species of conservation concern and species with restricted ecological requirements. Driftwood hosted several species that have not been previously found in the archipelago forests, and the logs clearly enrich the fungal diversity in the area. Our results encourage to increase dead wood for fungi in coastal forests where it has been dramatically decreased as a result of strong hemeroby.

中文翻译：

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波罗的海沿岸的浮木上的非生物类真菌的多样性和生态学

浮木是漂浮在海上或由海边带到岸上的木质碎片。它可以具有自然起源，但通常起源于人类活动。浮木作为多种物种的微生境具有重要的生态作用。全球对浮木上与死木相关的非金属类真菌的研究很少，而且在波罗的海几乎没有进行任何研究。我们研究了在芬兰西南岸的浮木（人工原木）上生长的多孔和皮质类固醇的多样性和生态学。总共对394块浮木原木进行了调查，以发现可见的真菌孢子果。我们共发现145种（1023条记录），其中约四分之三是皮质类固醇。浮木原木上藏有几种稀有和值得注意的物种，例如一种新的皮质类物种，该地区16种国家珍稀物种和40种新物种。五个最常见的物种占所有观测值的三分之一，而82个物种（占所有记录的11％）仅记录了一次或两次。与小直径的原木相比，更大的原木平均托管着更多的物种。当比较衰减的第一阶段和中间阶段的对数时，平均物种数显着增加。我们的结果表明，浮木原木可以容纳各种各样的物种，它们为许多与死木相关的真菌提供了重要的底物，包括需要保护的物种和生态要求受到限制的物种。浮木寄养了一些以前未在群岛森林中发现的物种，原木显然丰富了该地区的真菌多样性。