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Vistula River is the last big, wild and unregulated river in Western and Central Europe. And it is its the biggest value - it is the south-north ecological corridor for water and terrestrial animals, habitat for many species of birds in summer and in winter. The sandy banks and islands in the Vistula River play a important role in self-purification of riverine water - one square meter of the sandy bank (or beach) utilizes 100 g of organic matter (in Vistula there are first of all anthropogenic wastes)per year. If this 100 g will be multiplied by hundred thousands square meters of riverine beaches, sand banks and other sandy places, we will have tons of wastes utilized by sandy microfauna to carbon dioxide gas and water. And it is main reason why me must protect the natural “wildness” of Vistula River.
The aim of the present paper is description of the beginning of bioenergetics studies and its development in Poland, in Warsaw center of biological sciences. Generally bioenergetics is the study of energy transformations in living organisms, and that such a study may be according to any one of three approaches: the molecular-biochemical, the physiological and the ecological. It should be noted therefore that ecological bioenergetics, being concerned solely with energy transformations by ecological units, is but one aspect of ecology; although one which can make significant contribution to our understanding of how a nature functions. The main fields of bioenergetics studies in Institute of Ecology and than in the Centre for Ecological Research of the Polish Academy of Sciences in Dziekanów Leśny near Warsaw are: energetic budgets of invertebrates, bioenergetics of early developmental stages of fish species, mathematical modeling of energy flow through an animal, population, community and ecosystems, such a soil, sandy beach etc. Now bioenergetics can be a useful tool in individual-based approach in ecology.
The oxygen consumption of a sandy beach interstitial community was determined on four occasions (January, May, August, October) on the Gulf of Gdańsk (southern Baltic Sea). The study was carried out at four locations on the beach slope (littoral, waterline, splash zone and middle beach). Oxygen consumption varied from 158–159 cm3 O2 m−2 h−1 at the underwater site and waterline to 20–36 cm3 O2 m−2 h−1 in the middle beach. According to these data, interstitial organisms are able to utilize from 206 to 1641 mg of organic carbon per square metre per day. In general, metabolic activity decreased gradually from the waterline towards the middle beach, and a significant correlation was found between oxygen consumption and sediment water content. Changes in oxygen consumption on the beach slope were statistically significant.
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