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The influence of river funktionality on habitat selection by Ephemeroptera in spatially and temporaly diverse lowland rivers, with particular reference to the River Bug

Głazaczow A., Orwin D., Bajaczyk R.

Oceanological and Hydrobiological Studies

2009

Vol. 38, No.2

63-76

The purpose of this work is the designation of changes in the environmental preferences of mayflies in the prevailing conditions in a large lowland river little changed by human activity. During the study, the occurrence of the following species were recorded: Cercobrachys minutus (54.2%); Procloeon nana (24.5%); Pseudocentroptiloides shadini (7.6%); Ametropus fragilis (2.9%), which were numerously represented and formed a permanent element of the fauna, and Baetopus wartensis (0.1%) and Oligoneurisca borysthenica which were noted very rarely and were accidental species. The differences and similarities in the functionality of the psammophilous and other mayfly assemblages were assessed. The data from the last fifteen years of study was investigated and compared with those from other rivers which were more managed. PCA was used to distinguish the main factors influencing habitat selection at particular stages of life history and the tendency for drifting.

Mineralization and humification of Dactylis glomerata litter in field experiment excluding macroarthropods

Kusińska A., Kajak A.

Polish Journal of Ecology

2000

Vol. 48, nr 4

299-310

Decomposition rate of Dactylis glomerata was compared in two types of field mesocosms - (O-open) accessible for macroarthropods active on the grassland soil surface, or not accessible (C-closed) for them. Content of total carbon and nitrogen, as well as carbon incorporated in humus compounds was determined in the litter exposed in litter bags and inside poor in organic matter sandy substratum underlying the litter. Studies were repeated in two experiments, each lasting about a year. At the end of experiments 51-61% of the initial amount of carbon, introduced in the litter was mineralized, 13-19,7% was transformed into humus acids. Mineralization rate was more intense in C mesocosms, higher amount of humus was recorded in mesocosms accessible for macroarthropds (by 2,3 and 14,6% in autumn, respectively in both experiments). This newly formed humus was easily decomposable, part of it, particularly fulvic acids, were mineralized during winter