Trichopteran Communities of Streams Associated with Aspen and Conifer Forests: Long‐Term Structural Change
Trichopteran Communities of Streams Associated with Aspen and Conifer Forests: Long‐Term Structural Change
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与白杨和针叶林相关的溪流中的毛翅目群落：长期结构变化
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发表时间：
1982
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影响因子：
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通讯作者：
M. Molles
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作者：
M. Molles
对与白杨、云杉、冷杉和尼克松针叶林相关的溪流的毛翅目群落的比较表明，结构存在显着差异。尽管白杨相关溪流和云杉-冷杉相关溪流中的毛翅目物种组成实际上是相同的，但两种溪流中碎翅目毛翅目和食草毛翅目的相对丰度存在显着差异。白杨溪流中切碎机与食草动物生物量的比例为 1:17，而在针叶树溪流中，粉碎机与放牧动物生物量的比例为 3:1，优势则相反。两种类型溪流中功能组的优势差异归因于针叶树溪流中发现的碎屑的数量级更大。据推测，针叶树溪流中更多的碎屑积累是原木改变栖息地的结果。与白杨溪流相比，针叶树溪流中发现的原木数量是白杨溪流的五倍。针叶树溪流中原木的大量积累归因于针叶树木材分解率较低。这些数据表明了落基山脉南部毛翅目动物群落长期结构变化的一般模型，我认为这些长期变化是森林演替过程中木材投入数量和质量变化的结果。
A comparison of the trichopteran communities of streams associated with aspen, spruce-fir, and nixed-conifer forests demonstrated significant differences in structure. Though tri- chopteran species composition in aspen-associated and spruce-fir associated streams was virtually identical, relative abundances of shredder and grazer Trichoptera differed significantly in the two types of streams. The ratio of shredder to grazer trichopteran biomass in aspen streams was 1:17 while in conifer streams, the dominance was reversed with a shredder to grazer biomass ratio of 3:1. The difference in dominance of functional groups in the two types of streams was attributed to the order-of-magnitude greater standing crop of detritus found in the conifer streams. It is hypothesized that the greater accumulation of detritus in conifer streams is the result of habitat modification by logs. Five times the number of logs were found in conifer streams as compared to aspen streams. The greater accumulation of logs in the conifer streams is attributed to lower rates of decomposition of conifer wood. The data suggest a general model for long-term structural change in trichopteran communities of the southern Rocky Mountains and I suggest that these long-term changes result from changes in quantity and quality of wood inputs during forest succession.