Patterns of macroinvertebrate traits along three glacial stream continuums
Patterns of macroinvertebrate traits along three glacial stream continuums
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DOI：
10.1111/j.1365-2427.2006.01533.x
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发表时间：
2006-05-01
影响因子：
2.7
通讯作者：
Castella, E
中科院分区：
文献类型：
--
作者：
Ilg, C;Castella, E
1. 冰川补给河流具有低空间异质性和高时间异质性的特点，表现为冰川径流引起的季节性和日流量和悬沙峰值。这些溪流庇护着适应如此恶劣环境条件的大型无脊椎动物群落。研究冰川溪流中大型无脊椎动物的特征与环境条件的关系，可以为了解冰川溪流群落的结构和功能提供重要的见解。从瑞士中部和法国南部阿尔卑斯山脉的三条冰川溪流收集的数据中，我们分析了六种生物性状之间的关系，从而定义了五组具有相似性状的大型无脊椎动物类群。根据结合水温、电导率、悬浮物和底物稳定性的冰川指数，分析了这五组特征的纵向分布和个体特征的变化。3条河流的性状多样性表现出较强的上下游梯度。上游主要是一组以小型爬行沉积物食用者为特征的类群。其他以性状为基础的群体逐渐出现在下游。基于性状的类群在冰川梯度上的相对频率变化，突出了三种河流中全面的抗性/弹性性状的优势，并证实了冰川河流中的环境条件过于苛刻或均匀，无法让大型无脊椎动物群落发展出替代的性状组合。在现有文献中讨论了与性状编码问题相关的研究结果。
1. Glacier-fed streams are characterised by low spatial but high temporal heterogeneity, manifested in seasonal and diurnal discharge and suspended sediment peaks induced by glacial runoff. These streams shelter macroinvertebrate communities adapted to such harsh environmental conditions. Studies relating macroinvertebrate traits to environmental conditions in glacial streams could provide important insights into the structure and function of glacial stream communities.2. From data collected in three glacial streams from the central Swiss and southern French Alps, we analysed the relationships among six biological traits to define five groups of macroinvertebrate taxa with similar suites of traits.3. The longitudinal distribution of the five groups and of individual traits was analysed, as well as their variation according to a glaciality index combining water temperature, conductivity, suspended solids and substrate stability.4. The trait diversity along the three streams showed a strong upstream-downstream gradient. The upper reaches were dominated by a single group of taxa characterised by small, crawling, deposit feeders. The other trait-based groups appeared progressively downstream.5. Changes in the relative frequency of trait-based groups along the glaciality gradient highlighted the dominance of all-rounder resistant/resilient traits in the three streams and confirmed that environmental conditions in the glacial streams are too harsh or uniform to allow macroinvertebrate communities to develop alternative suites of traits. The findings are discussed in relation to the question of trait coding in the available literature.