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Scanning electron microscopy investigation of bacterial colonization of marine beach sand grains

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Mudryk Z. J., Podgorska B.

Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline

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2006

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tom 10

Scanning electron microscopy was employed for the investigation of bacteria living on sand grains in a sandy marine beach in the Gulf of Gdansk (southern Baltic Sea). Bacteria colonize the sand grains; individual topography and shape of the grains were decisive for the colonization. Grains of diverse topography characterised by a great irregularity of shape were preferred, and protected surface sites were favoured. Many of the attached bacteria were found to produce polymer secretions; entire colonies attached by means of polymer nets were observed. A significant morphological diversity of bacteria in the vertical profile of the beach was determined. Bacteria inhabiting the sand grains showed the ability to reproduces.

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Are community composition and abundance of psammon Rotifera related to grain-size structure of beach sand in lakes?

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Ejsmont-Karabin J.

Polish Journal of Ecology

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2004

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tom 52

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nr 3

The aim of the study was to test the hypothesis that the size distribution of sand grains in lake beach should affect the species composition, densities and body-size structure of psammon communities of Rotifera. Studies were carried out in hydro-, hygro- and euarenal zones of 38 beaches (5 to 50 m long and 1 to 10 m wide) in 16 lakes of different trophic status and morphometry (Masurian Lakeland, Poland). Porosity has no impact on psammon rotifer numbers as well as body-size of animals does not seem to play a significant role in species preference to different size classes of sand grains. However, the significant correlations were found between the rotifer numbers and the share of grain size fraction 0.25–1.00 mm (positive) and the share of the largest (i.e. >1 mm) fraction (negative). The psammobionts generally are more related to the grain size fraction 0.5–1.0 mm than the psammoxenes and psammophiles. Although particular rotifer species prefer different grain size fractions, bdelloids are the only group of Rotifera preferring the smallest (<0.125 mm) grain fraction.

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Psammon algae: composition and spatial distribution in hygroarenal of eutrophic lake

80%

Kalinowska K., Gorelysheva Z., Ejsmont-Karabin J.

Polish Journal of Ecology

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2011

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tom 59

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nr 1

Psammon habitats like freshwater sandy shores are the peculiar sites due to high fluctuation of physico-chemical conditions and due to the specific composition of the organisms communities distributed along the horizontal pattern related to the wave action. Taxonomic composition, numbers and biomass of phytopsammon were studied in hygroarenal (shore sand beach wetted by lake waves) of the small beach of the eutrophic Lake Mikołajskie (area 498 ha, max. depth 26 m) (Masurian Lake District, Poland). Samples were collected on one occasion (26 June 2003) from 30 sampling stations distributed parallel to lake shore along 10 m line at three different distances (sampling points A, B, C) from 0 to 60 cm from water line. The studies showed distinct horizontal distribution of psammon algae. Their numbers and biomass varied from 2.22 to 31.85 × 03 cm–3 of sand and from 0.49 to 4.69 μg cm–3 of sand, respectively. Mean numbers in all sampling distances were very similar, while the biomass increased with increasing distance from water line. Cyanoprokaryota, among which Oscillatoria spp. were most numerous species, dominated in the numbers, whereas Bacillariophycea (mainly Stephanodiscus hantzschii Grun. and Fragillaria spp.) constituted significant proportion of the total algae biomass. There were no significant correlations between abundance of algae and size fractions of sand. Among taxonomic groups, only the biomass of Cyanoprokaryota showed positive correlations with trophic parameters (TP, TN). The studies did not show any correlations between phytopsammon and the abundances of ciliates and rotifers, suggesting that different environmental factors as well as organisms of the higher trophic levels may play a decisive role in the development and horizontal distribution of algae in hygroarenal of the beach of the eutrophic lake.

Ograniczanie wyników

2 Polish Journal of Ecology

1 Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline

2 Ejsmont-Karabin J.

1 Gorelysheva Z.

1 Kalinowska K.

1 Mudryk Z. J.

1 Podgorska B.

1 2011

1 2006

1 2004

Scanning electron microscopy investigation of bacterial colonization of marine beach sand grains

Are community composition and abundance of psammon Rotifera related to grain-size structure of beach sand in lakes?

Psammon algae: composition and spatial distribution in hygroarenal of eutrophic lake