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Aquatic hyphomycetes in Catamaran Brook: colonization dynamics, seasonal patterns, and logging effects

机译：双体船溪中的水生疏水菌：定殖动态，季节性模式和伐木效应

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Aquatic fungal colonization dynamics and seasonal patterns were investigated in two sites in Catamaran Brook, New Brunswick, Canada, as part of a larger study to evaluate logging effects on a salmon stream. Four leaf-pack trials were conducted between May 1995 and Dec 1996 to determine species composition of the fungal community, the seasonal pattern of colonization on decaying maple leaves, and what effects, if any, invertebrate feeding and logging activities might have on community structure. Contrary to expectation, neither mesh size (i.e., invertebrate presence or absence) nor preliminary logging activity (road construction near one site) had a consistent effect on community structure. Time of immersion of the leaves in the stream, followed by season, were the major factors controlling community structure. Spore production and species diversity measures were highest during the middle part of the colonization period (generally 4-8 wk of immersion in summer trials and 2-4 wk immersion in the autumn trial), and were also higher in the autumn (Sep to Dec) than in the summer trials. Forty-five species of hyphomycetes were recorded during the study period, although 6 taxa (Alatospora acuminata, Anguillospora filiformis, Articulospora tetracladia, Geniculospora inflata, Lunulospora cymbiformis, and a sigmoid species, probably Flagellospora curvula) made up nearly 95% of all identified spores. A total of 35 species were found during the autumn trial, compared to 27 in each of the two summer trials, and 25 during a winter trial. Colonization dynamics also varied with season, but generally there were three main colonization patterns; some taxa were only present or showed highest abundance very early in the colonization period, most arrived or peaked during intermediate stages of leaf decay, and a few were characteristic of the latest stages. [References: 40]
机译：在加拿大新不伦瑞克省Catamaran Brook的两个地点，调查了水生真菌的定殖动态和季节模式，这是一项较大的研究的一部分，以评估伐木对鲑鱼流的影响。在1995年5月至1996年12月之间进行了四次叶丛试验，以确定真菌群落的物种组成，在腐烂的枫叶上定居的季节性模式以及无脊椎动物的摄食和伐木活动对群落结构的影响（如果有的话）。与预期相反，网孔大小（即无脊椎动物的存在或缺失）或初步伐木活动（一个地点附近的道路建设）都没有对社区结构产生一致的影响。叶子在河中的浸入时间，然后是季节，是控制群落结构的主要因素。在定植中期，孢子的产生和物种多样性的测量值最高（夏季试验通常为4-8 wk，秋季试验为2-4 wk），秋季也较高（9月至12月） ），而不是在夏季试用中。在研究期间，记录了45种菌丝体，尽管6种分类单元（阿拉托孢菌，丝状鳗，钩端螺旋体，黄连孢菌，c形孢子菌和乙状结肠菌，大概鉴定出了弯曲菌的95％） 。在秋季试验中共发现35种，而在两个夏季试验中均发现27种，在冬季试验中发现25种。殖民地动态也随季节而变化，但总体上主要有三种主要的殖民地模式。一些类群仅在定居期的早期才出现或显示最高的丰度，大多数在叶腐烂的中间阶段到达或达到高峰，而另一些则是最新阶段的特征。 [参考：40]

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