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2 Polish Journal of Ecology

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Stream habitats, benthic macroinvertebrates, lotic fish and their relationships : a multi-scale approach

Fleituch T., Amirowicz A.

Polish Journal of Ecology

2005

Vol. 53, nr 1

81-95

A natural reach of montane stream (length 96 m and 7 m width) was grided into 150 cells (2 x 2 m). Density and biomass of fish (Salmo trutta L., and Cottus poecilopus Heckel) were estimated at each cell, as well as stream depth, current velocity. Froude number, bed granulation and its roughness were measured, and benthic samples from exposed bricks were collected from mid August to early October. The analysis of spatial patterns of seven variables (five abiotic and two biotic ones) and fish occurrence from the period of highest organisms' abundance confirmed that two fish species were separated within the stream space and sculpin showed close association to benthic prey. The PCA pointed to the highest loadings of abiotic haditat variables (64% of the total variance) indicating importance of hydraulics (stream velocity and Froude number) and bed characteristics (stream depth and bed roughness) in distribution of fish communities in pristine low order streams.

The impact of fungi and macroinvertebrates on the breakdown of beech and ash leaves in a woodland stream

Fleituch T.

Polish Journal of Ecology

2001

Vol. 49, nr 4

359-368

This study examines the relationship between the breakdown of beech (Fagus silvatica L.) and ash (Fraxinus excelsior L.) leaves and then aquatic fungi and macroinvertebrate assemblages by exposing leaves in different mesh bags (coarse and fine) in a mountain stream over seven months. The % of ash free dry mass remaining differed significantly between two categories of bags, leaf taxa, and time intervals. Ash breakdown was more rapidly than the breakdown of beech. The first sporulation peak was observed in 6 week on ash and the second peak in 12 week on beech leaves (1019 and 848 conidia mg^-1 dry mass day^-1, respectively). Total biomass of invertebrates correlated with fungi biomass on beech leaves. The gathering collectors were significantly associated with fungi biomass on ash leaves. Number of shredders (e.g. Nemoura spp., Protonemoura sp., Capnia sp.), filtrators (Simuliidae, Ephemera vulgaris L.), and scrapers (Heptageniidae) showed no relationship with any leaf characteristic, suggesting that coarse leaf bags were used mainly as a habitat and not as a food resource.