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Effects of emergent plant species and growth strategy on microbial community structure and diversity

100%

Wang A.-L.

Polish Journal of Environmental Studies

2013

tom 22

nr 5

A field study was conducted in two adjacent shallow lakes (Aiwan Lake and Qingnian Lake) in Tianjin, China, to investigate the effects of plant species and growth strategy (single or mix) on the microbial community’s structure and diversity in the rhizosphere of emergent plants by phospholipid fatty acid (PLFA) methods. The results demonstrated that microbial biomass was higher in the Typha orientalis (T. orientalis) rhizosphere than that in the Phragmites australis (P. australis) rhizosphere, whether they grew separately or together. The bacterial population of gram-positive bacteria (G⁺) was found to be less than that of the gramnegative bacteria (G⁻) in all samples, and the ratio of G⁺ to G⁻ in the plant rhizosphere was less than that in the non-rhizosphere. The diversity index of plant rhizosphere was higher than that of the non-rhizosphere, and was higher in the T. orientalis rhizosphere than in the P. australis rhizosphere. Cluster analysis demonstrated that microbial community structure was more significantly influenced by plant species than by growth strategy.

Effect of size and number of seeds on germination and seedling size in six helophyte species

100%

Gordon E.

nr 2

Composition and distribution of epiphytic midges (Diptera: Chironomidae) in relation to emergent macrophytes cover in shallow lakes

80%

Tarkowska-Kukuryk M.

tom 59

nr 1

The influence of emergent macrophytes (dominated by Phragmites australis (Cav.) Trin. ex Steud.) on the species composition, richness and abundance of epiphytic midges (Diptera: Chironomidae) was studied in five shallow lakes of eastern Poland during three seasons (May, July and October) of 2001. The lakes represented three states: clear (macrophyte dominated), intermediate (phytoplankton-macrophyte dominated) and turbid (phytoplankton dominated). The trophic status of lake strongly affected the assemblages of chironomids living on the surfaces of common reed. Habitat conditions regulated mostly densities and relative abundance of midge taxa and did not have any significant influence on the number of taxa. The Canonical Correspondence Analysis of epiphytic fauna showed the significance of 5 environmental variables: Secchi disc visibility, dissolved oxygen, reed density, concentration of total phosphorous and epiphytic chlorophyll-a. The analysis separated epiphytic midges into two groups. The first group included taxa limited by low oxygen content and water transparency and corresponds with clear state habitats. To the second group belong taxa typical of eutrophic waters with densities determined by the concentrations of total phosphorous and chlorophyll-a, common in lakes of intermediate state and in particular of turbid state.