Seasonal Variation in Standing Crop and Species Diversity of Insect Communities in a small Quebec Stream
Seasonal Variation in Standing Crop and Species Diversity of Insect Communities in a small Quebec Stream
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魁北克小溪中常备作物和昆虫群落物种多样性的季节变化
DOI：
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发表时间：
1969
期刊：
影响因子：
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通讯作者：
J. Kalff
中科院分区：
文献类型：
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作者：
R. Mackay;J. Kalff
在一个以落叶为主要食物的凉爽林地小溪流中，研究了昆虫种类分布和丰度的季节变化。在1966年3月至1967年3月间，每周从沙、砾石、石头、树叶和树叶碎屑生境中采集定量样品。各生境单位面积昆虫数量在沙地中最少，在砾石、石块、树叶和碎屑中增加。单位面积生物量在砾石中最少，在碎屑、沙子、树叶和石头中增加。整个河流的年常住作物约为3000只昆虫/平方米和2克/平方米（干重量）。不同生境中昆虫种类的数量随环境的空间异质性、基质的稳定性和食物资源的不同而变化。叶片支持的物种最多（92个），沙最少（61个）。夏季和冬季的物种多样性高于春季和秋季。与其他水生环境相比，该河流的底部动物群具有低营养特征，包括物种数量多，丰富度低至中等的年常绿作物。
Seasonal changes in the distribution and abundance of insects species were studied in a small cool woodland stream where the primary food material was fallen leaves. Between March 1966 and March 1967, weekly quantitative samples were taken from sand, gravel, stone, leaf, and leaf detritus habitats. The number of insects per unit area of each habitat was least in sand and increased through gravel, stones, leaves, and detritus. Biomass per unit area was least in gravel and increased through detritus, sand, leaves, and stone. The annual standing crop of the stream as a whole was approximately 3,000 insects/m2 and 2 g/m2 (dry wt.). The number of insect species in any one habitat varied according to apparent spatial heterogeneity of the environment, to substrate stability, and to food resources. Leaves supported the highest number of species (92), sand the least (61). Species diversity was higher during summer and winter than during spring and autumn. When compared with other aquatic environments, the bottom fauna of the stream has oligotrophic features, including a large number of species and an annual standing crop of poor to intermediate richness.