Growth and voltinism of lotic midge larvae: Patterns across an Appalachian Mountain basin
Growth and voltinism of lotic midge larvae: Patterns across an Appalachian Mountain basin
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吸水蠓幼虫的生长和挥发性：阿巴拉契亚山脉盆地的模式
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发表时间：
1990
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影响因子：
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通讯作者：
A. Huryn
中科院分区：
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作者：
A. Huryn
对位于阿巴拉契亚山脉盆地的四条溪流中的摇蚊幼虫栖息在凋落物堆积物中的群落水平生长速率和化性进行了估计。幼虫组被限制在生长室和原位孵育的时间间隔代表了观察到的年度热变化范围。根据孵育期内平均长度的变化得出每日生长率（g）的估计值。使用多元回归，我发现温度和幼虫大小有显着的积极和消极的影响，分别对g。方程推导出每个流描述了观察到的g值（X2 = 0.7 l-0.82）之间的方差的相当大的比例，但没有显着差异。因此，将所有溪流的数据结合起来，推导出一个通用方程，该方程与幼虫大小分布、生物量和温度数据一起，沿着，用于模拟研究溪流中年生物量周转率（G）和假设的大小依赖性化性的变化。幼虫的大小分布并没有显着不同的流和G（范围= 12.8 - 18.6）的变化主要是由于在热制度的变化。在化性的差异被预测是轻微的，但密切依赖于两个终端大小的幼虫和热制度。该模型提供的证据表明，在31%的顺序上的空间变化，可以预期在一个<30平方公里的面积阿巴拉契亚山脉盆地的吸浆虫群落。
The intluence of thermal regime upon community-level growth rates and voltinism was estimated for larval Chironomidae inhabiting litter accumulations in four streams located in an Appalachian Mountain basin. Groups of larvae were confined in growth chambers and incubated in situ at time intervals representing the observed range of annual thermal variation. Estimates of daily growth rates (g) were derived from change in average length over the incubation period. Using multiple regression, I found temperature and larval size to have significant positive and negative effects on g, respectively. Equations derived for each stream described a substantial proportion of the variance among observed g values (X2 = 0.7 l-0.82) but did not differ significantly. Therefore, the data from all streams were combined to derive a single general equation which, along with larval size distribution, biomass, and temperature data, was used to model the variation in annual biomass turnover(G) and hypothetical size-dependent voltinism among the study streams. Size distribution of larvae did not differ significantly among streams and variation in G (range = 12.8-18.6) was attributed primarily to variation in thermal regime. Differences in voltinism were predicted to be minor but were closely dependent on both terminal size of larvae and thermal regime. The model provides evidence that spatial variation of G on the order of 31% can be expected for midge communities within a < 30 km2 area of this Appalachian Mountain basin.