Spatiotemporal variability of chemistry and biota in boreal surface waters

摘要: This thesis focuses on the assessment of spatial and temporal patterns freshwater communities in relation to variability changes abiotic environment (i.e. water chemistry). The importance geographic position, regional- local-scale factors as drivers natural lake stream chemistry was quantified compared by variance partitioning using partial redundancy analysis. A major part surface explained interactions between geographic, regional local factors. Streams lakes were similar their response, indicating that idiosyncrasies both systems might be suppressed effects large-scale factors, particular, if human-induced catchment variation generates a high amount environmental noise. Regional processes are also important structuring composition communities. relationship diversity across three scales macroinvertebrate determined additive concept. Local habitat heterogeneity) an factor contributing species coexistence resulting saturating On other hand, may confound ability detect perturbation or recovery. multihabitat analysis rates trajectories recovery acidified well persistence pelagic benthic reference showed is complex challenging process, influenced multiple For instance, climate-induced runoff introduce significant confounding influencing stability As focus shifting from single-site management ecosystems, it policy makers managers aware which scale most quality biodiversity. results this show holistic, multiscale analysis, involving several habitats biotic indicators, needed understand ecosystem response large-scale, stressors so best protect world’s precious vital resource - freshwater.