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1

Seasonal changes of itersititial community respiration in a Baltic sandy beach

100%
Urban-Malinga B., Opalinski K. W.
Oceanological Studies
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2002
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vol. 31
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issue 3-4
57-70
EN
Interstitial community respiration in a Baltic sandy beach on the Gulf of Gda?sk was investigated in terms of sediment oxygen consumption over a seasonal cycle. The study was carried out at four locations on the beach slope (littoral, waterline, splashzone and middle beach). Oxygen uptake changes over time were not statistically significant and no correlation was found between sediment respiration and water temperature. It seems that food supply to the sandy beach system is the predominant factor determining the interstitial community metabolism. The lowest values of oxygen consumption (9-33 cm3 O2 m-2 h-1) were noted in the middle beach station; the highest results (up to 212 cm3 O2 m-2 h-1) were related to the littoral site. Organic matter concentration in the sediment ranged between 0.09 and 0.9% dwt.
2

Sandy coastlines - are there conflicts between recreation and natural values?

100%
Weslawski J. M., Urban-Malinga U.-M. B., Urban-Malinga B., Kotwicki K. L., Kotwicki L., Opalinski O. K., Opalinski K., Szymelfenig S. M., Szymelfenig M., Dutkowski D. M., Dutkowski M.
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issue 2
5-18
EN
Unlike dunes, sandy beaches and the littoral zone are usually regarded as non-vulnerable. The biodiversity and biomass of interstitial organisms are low. How-ever, recent findings have shown that marine sands transfer energy very ef-fectively, and that chemical and biological reactions take place faster there than in fine-grained sediments. The importance of the microphytobenthos and bacteria to this system is little known. The effects of recreational pressure (trampling, beach cleaning and nourishment) are not well understood. A pilot study from the Baltic Sea shows the importance of trampling as a form of bioturbation, a very effective way of fragmenting and mixing organic matter with the sand. The high diversity of diatoms and meiofauna in undisturbed beaches may act as an effective biological filter for some types of pollutants, while less diverse, but more abundant biota in disturbed areas are more effective in processing organic matter (self-cleaning of the beach).
3

Vertical zonation of the total, biotic and abiotic oxygen consumption on a Baltic sandy beach

100%
Urban-Malinga B., Opalinski K. W.
Oceanological Studies
|
1999
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vol. 28
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issue 3-4
85-96
EN
The oxygen consumption of a sandy beach on the Gulf of Gdansk (southern Baltic Sea) was determined. The study was carried out in three sediment layers (0-1, 1-6, 6-11cm) at four localities on the beach profile. Total oxygen consumption lay between 0.59 and 4.33 mm3 O2 cm-3 h-1. A significant linear correlation was found between sediment depth and total oxygen consumption in the littoral zone (r = 0.85) and in the splash zone (r = -0.71). The highest biotic oxidation was recorded in the upper sediment layers in the splash zone (0-1 cm: 1.57 mm3 O2 cm-3 h-1) and at the waterline (1-6 cm: 1.87 mm3 O2 cm-3 h-1). Meiofaunal respiration constituted 0.1- 3.0% of the biotic oxygen consumption. Abiotic oxygen consumption ranged between 0.07 and 3.43 mm3 O2 cm-3 h-1 and was the dominant component of total oxidation in deeper layers.
4

Predrying of stranded wrack material as an aspect of the litterbag techniques in the sandy beach studies

75%
JedrzejczaK M. F.
Oceanological and Hydrobiological Studies
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2003
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issue 1
59-74
EN
Methodological aspects of the arrangement of stranded wrack for the degradation rates within the litterbags were tested in a simple field experiment on temperate, fine/medium quartz sediment, sandy beach in Poland at the end of the Hel Peninsula (5436?N, 1849?E). Litterbags of the mesh size of 0.5 mm were used to construe and assess the role of the pre-drying of wrack before its placement into the bags. The field station was established on the backshore, 15 m in width seaward from the crest of a dune. Three methods of predrying were done: (1) air drying, (2) oven drying, (3) freeze drying, as well as (4) non-dried fresh material was used as reference. The stranded seagrass wrack (Zostera marina L.), obtained directly from the beach, and then prepared in accordance with the procedures described above, was used as the study material. Four trials were run with five repetitions of litterbags 7 cm long 7 cm wide made from nylon mesh with 0.5 mm aperture widths. After exposition, bags were retrieved 5, 10, 50, 100, 150, 200 and 250 days post-placement. In the laboratory, samples of remaining material were dried by the same method as earlier, respectively, and then weighed, and analysed using a CHNS Analyser. It was shown that, under similar conditions of sediment composition, salinity and wave inundation, the method of predrying had little influence on the long-term process of decay. In the case of non-dried replicates, degradation rapidly proceeded in the initial stages and then stabilised to be linear, whereas, in dried samples it was done so linearly throughout the study period with only little differences. Such differences observed in the early part of the experiment were most likely the result of differences in material structure and the initial chemical composition of the plant material caused by a predrying-incurred disturbance in the chemical structure. Nevertheless, short-term environmentally driven sampling strategies fail to obtain conclusive results about degradation estimates of stranded wrack and should be avoided at least with the use of dried material.
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