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Fungi and fungus-like organisms growing in selected lotic oxbow lakes and tributaries of the Narew River

Muszyńska E., Kiziewicz B., Godlewska A., Jankowska D., Ordak M.

Oceanological and Hydrobiological Studies

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2017

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Vol. 46, No. 1

85--95

EN

Mycological and hydrochemical research was conducted in two different types of reservoirs connected with the Narew riverbed (three tributaries and three lotic oxbow lakes) in two growing seasons. The obtained results seem to indicate that more favorable conditions for the development of the analyzed microorganisms prevailed in the studied tributaries of the Narew. A total of 36 species of fungi and fungus-like organisms were identified in these tributaries in spring and 35 in autumn, while respectively 32 and 26 species in the lotic oxbow lakes. Six taxa not identified in the oxbow lakes were found only in the tributaries of the river. They were: Alternaria alternata, Allomyces moniliformis, Catenaria anguillulae, Leptomitus lacteus, Rhipidium parthenosporum and Saprolegnia diclina. On the other hand, only two species occurred only in the oxbow lakes (not recorded in tributaries) (i.e. Catenophlyctis variabilis and Rhizophlyctis rosea).

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Fungi biomass in lowland rivers of North-Eastern Poland: effects of habitat conditions and nutrient concentration

Górniak A., Więcko A., Cudowski A.

Polish Journal of Ecology

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2013

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Vol. 61, nr 4

749--758

EN

Fungi occur in almost all types of waters in the world and play an important role in many processes in the environment, particularly in organic matter decomposition. During the last several decades, extensive knowledge was obtained on the ecology of aquatic fungi, but on fungal biomass in the water column less. The study was aimed at simultaneous determination of seasonal and spatial variability of aquatic fungi biomass in the river waters in relation to selected physicochemical water parameters and trophic state in the 27 lowland rivers of north-eastern Poland with length between 17 and 308 km and mean annual discharge 1 – 100 m3 s-1. The chemical and mycological evaluation was provided on the basis of 64 water samples taken in the July and October 2010. The chromatographic method of determination of seston ergosterol as a specific organic compound typical for the majority of fungi, was applied. Fungi biomass was higher in summer than in autumn. The particulate organic carbon (POC) and dissolved organic carbon (DOC) concentrations had no effect on fungal biomass in the studied river, as well as forest cover of the catchment and river discharge. Statistically significant correlations of fungal biomass in the river water with concentrations of ammonium (N–NH4+), Kjeldahl (NKjel), total organic (TON) and total nitrogen (TN) and dissolved (DP) and dissolved organic phosphorus (DOP) were found. The principal component analysis indicates relations between (TIN) and phosphorus (SRP) and particulate phosphorus (PP) and freshwater fungi, specially in summer when aquatic fungi are able to modify the structure of the nutrients contained in the water column.

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

Fleituch T.

Polish Journal of Ecology

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2001

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Vol. 49, nr 4

359-368

EN

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.