Spatial and temporal variation in the macroinvertebrate fauna of streams of the northern jarrah forest, Western Australia: community structure
Spatial and temporal variation in the macroinvertebrate fauna of streams of the northern jarrah forest, Western Australia: community structure
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DOI：
10.1111/j.1365-2427.1986.tb00949.x
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发表时间：
1986-02
影响因子：
2.7
通讯作者：
S. Bunn;D. Edward;N. Loneragan
中科院分区：
文献类型：
--
作者：
S. Bunn;D. Edward;N. Loneragan
最高流量出现在冬季（6月至11月），夏末和秋季（1月至5月）流量减少到可以忽略不计。在夏季低流量与温暖的水，较低的溶解氧，阳离子的浓度增加，在许多情况下，较低的pH值。丰度，多样性和均匀度的时间变化表明，无脊椎动物区系成为主导的几个类群在夏季。夏季和冬季动物区系在大多数网站的区别，并与物理和化学环境的季节性变化。这种季节性是不典型的流系统以前在澳大利亚研究。大的空间差异也发生在2个类似大小的森林集水区的网站之间的小距离。速度和深度与观察到的动物群的时间变化密切相关，但其他变量，包括阳离子浓度和水温，也很重要。空间差异与阳离子的浓度，这可能只是反映了地质的集水区的差异。
Highest stream discharge occurs during winter (June-November) reducing to negligible flow over late summer and autumn (January-May). Low flows in summer were associated with warm water, lower dissolved oxygen, increased concentrations of cations and, in many cases, lower pH. Temporal changes in abundance, diversity and evenness indicated that the invertebrate fauna became dominated by a few taxa during the summer months. Summer and winter faunas were distinguished at most sites and were associated with seasonal changes in the physical and chemical environment. This seasonality is not typical of stream systems previously studied in Australia. Large spatial differences also occurred over small distances among sites in 2 similar-sized forested catchments. Velocity and depth were highly associated with the observed temporal changes in the fauna, though other variables, including concentrations of cations and water temperature, were also important. Spatial differences were correlated with concentrations of cations which may simply reflect differences in the geologies of the catchments.