Random patch dynamics of larval Chironomidae (Diptera) in the bed sediments of a gravel stream
Random patch dynamics of larval Chironomidae (Diptera) in the bed sediments of a gravel stream
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砾石流河床沉积物中摇蚊幼虫（双翅目）的随机斑块动态
DOI：
10.1111/j.1365-2427.1993.tb00806.x
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
P. Schmid
中科院分区：
文献类型：
--
作者：
P. Schmid
1 1984年9月至1985年8月，在高山砾石溪的两个纵向断面上，对沉积物表面和潜流间隙的摇蚊幼虫群落进行了调查。共鉴定出80个种和种组，其中大部分属于直枝藻亚科。在所有的幼虫个体中，51.1%的幼虫个体栖息在床层沉积物的前10cm，93.2%的幼虫个体发生在表层和40cm深度之间。2在四个沉积物深度层中，水平相邻的采样点之间的空间物种周转率显示出显着的变化。在这两个样带的物种组成表现出显着较低的营业额在上10厘米的床沉积物比在更深的层。3空间群落稳定性表现出振荡模式之间的所有采样点之间的深度层之间的幼虫密度的变化。弹性的时间差异（局部稳定性）与砾石溪中累积流量格局的变化呈显著正相关，表明群落在受到干扰后具有快速恢复的能力。4 5种丰富的物种（Corynoneura lobata，Synnorocladius semivirens，Tvetenia calvescens，Micropsectra atrofasciata和Rheotanytarsus nigricauda）在沉积物深度分布上表现出显著差异，其中密度最大值在深度层之间移动。空间自相关表明，这些幼虫形成补丁之间的相邻采样点不同的大小和补丁间的距离在每个沉积物层。模拟试验中，每个物种的个体分别在每个深度层的微生境之间随机排列，表明斑块可能是偶然出现的。5为了评估这五种摇蚊物种之间观察到的空间资源重叠值的重要性，基于300个个体和物种斑块的每个可能物种成对关联的随机化，开发了中性模型。流Oberer Seebach的幼虫摇蚊组合的空间组织似乎是由共存，由于随机补丁的形成和分散模式的间隙栖息地，这降低了强竞争相互作用的概率。
1The larval chironomid community of the sediment surface and the hyporheic inters titial was investigated in two longitudinal transects of an alpine gravel stream between September 1984 and August 1985. Eighty larval species and species groups were identified, most of which belonged to the subfamily Orthocladiinae. Of all larval individuals 51.1% inhabited the first 10cm of the bed sediments, and 93.2% occurred between the surface and 40cm depth.2The spatial species turnover showed marked variations between horizontally adjacent sampling sites in each of the four sediment depth layers. In both transects the species composition showed a significantly lower turnover in the upper 10cm of the bed sediments than in the deeper layers.3Spatial community stability showed an oscillating pattern between all sampling sites due to density shifts of larvae between depth layers. Temporal differences in resilience (local stability) were significantly and positively related to changes in the cumulative discharge pattern in the gravel brook, thus indicating the apparent ability of the community to recover quickly following disturbances.4The five abundant species,Corynoneura lobata, Synorthocladius semivirens, Tvetenia calvescens, Micropsectra atrofasciataandRheotanytarsus nigricauda, exhibited significant differences in their sediment depth distribution, with density maxima shifting between depth layers. Spatial autocorrelations suggest that these larvae form patches between neighbouring sampling sites with varying sizes and inter‐patch distances in each of four sediment layers. A simulation test, in which individuals of each species were randomly permuted between microhabitats of each depth layer separately, indicated that the patches might have arisen by chance.5To evaluate the significance of observed spatial resource overlap values amongst these five chironomid species, neutral models were developed based on 300 randomizations of each possible species pair‐wise association of individuals and patches of species. The spatial organization of a larval chironomid assemblage in the stream Oberer Seebach seemed to be governed by coexistence due to random patch formation and dispersal patterns within the interstitial habitats, which reduce the probability of strong competitive interactions.