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Dry weight and calcium carbonate encrustation of two morphologically different Chara species : a comparative study from different lakes

Pukacz A., Pełechaty M., Frankowski M., Pronin E.

Oceanological and Hydrobiological Studies

2016

Vol. 45, No. 3

377--387

Two charophyte species (Chara tomentosa Thulli. 1799 and Chara globularis L. 1753) were studied to assess their biomass and CaCO3 production in seven hard-water lakes in Western Poland. In each lake, samples of ten individuals from three study sites were collected for dry weight (DW) and calcium carbonate content (% CaCO3) analyses. Additionally, physicochemical parameters of water collected from the above sampling sites were analyzed. No significant differences were found between the study sites in each lake for any of the analyzed parameters. In all the lakes, DW of C. tomentosa (0.60 ± 0.23 g indiv.-1) was significantly higher and more differentiated than DW of C. globularis (0.11 ± 0.08 g indiv.-1), suggesting species-specificity. The CaCO3 content in DW for C. tomentosa was higher (58.8-70.9%) than in C. globularis (50.1-68.3%), however, it did not reflect the DW differentiation, suggesting lake-specificity. The physicochemical properties of water revealed clear lake-to-lake differentiation. Different correlations between dry weight and calcium carbonate content and lake characteristics were found for each species. The results showed that DW and % CaCO3 are closely related to habitat conditions and different factors may influence the individual biomass of each species.

Soil-litter macrofauna in the mixed forest and midfield shelterbelts of different age (Turew area, West Poland)

Olechowicz E.

Polish Journal of Ecology

2004

Vol. 52, nr 4

405-419

The paper deals with the composition, density and biomass of soil-litter macrofauna in four midfield shelterbelts of different age and, comparatively, in the neighbouring mixed forest. The increase was observed along with the shelterbelt ageing of: 1) numbers of all macrofauna and particularly of some taxa (Symphyla, Chilopoda, coleopteran larvae and imagines and some dipteran larvae), 2) biomass of all macrofauna, of soil fauna (Group I) and of coleopteran larvae, 3) share of zoophages in all macrofauna and in dipteran larvae, 4) share of phytophages in coleopteran larvae communities, 5) average individual biomass, 6) taxonomic richness and the biodiversity (H'), 7) similarity of composition and domination structure of all macrofauna and of dipteran larvae to those in forest communities. The decrease of density of dipteran larvae, particularly of Chironomidae and Sciaridae and the share of saprophages in all macrofauna and in dipteran larvae was also observed. Successional stages of more numerous invertebrate taxa in newly established woodlots are described. Dipteran larvae were the pioneers in colonising newly established shelterbelts, particularly larvae from two families: Chironomidae and Sciaridae. Their combined contribution to the total density of dipteran larvae was 92%.