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Hard substrate photophilius marine algae species of the Saronikos Gulf amount to 197. Of them, 42 were Atlantic subtropical, 36 Atlantic tropical, and just 19 Atlantic boreal and 11 Boreal. The R/P ratio was 3.22. This shows the Atlantic subtropical character of the marine flora. 相似文献
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Theodore Koussouris dr. Aristidis Diapoulis dr. Ilias Bertahas George Photis Prof. dr. 《GeoJournal》1991,23(2):153-161
Lake Kastoria is a shallow lake with many anthropogenic activities concentrated in its catchment area. Surficial runoff rich in agricultural waste and underground seepage from urban and rural areas enrich the lake with nutrients intensifying the eutrophication problem of the water.Restoration techniques, with different approach, each one are proposed to restore the lake water. Treatment with alum is very effective but needs special care during the application. Reeds harvesting is an inexpensive and effective way and in combination with the city sewage redirection will improve the water quality and the trophic status of the lake sufficiently. 相似文献
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Estimating groundwater discharge into a lake through underwater springs by using GIS technologies 总被引：2，自引：1，他引：1
Estimating groundwater recharge in a freshwater body such as a deep lake is often a problem for hydrologists, since direct measurements are costly and difficult to implement. This study attempts to calculate the groundwater discharge in a lake using a simple water balance model, water level measurements, aerial photographs and GIS technologies. In particular, a Digital Terrain Model (DTM) for the lake has been developed, which in combination with GIS (Geographical Information System) software and water level fluctuations has provided the lake's monthly water storages. Additional hydrologic elements, including land and water uses, overland flow and evapotranspiration, have been estimated and incorporated in a water balance model which after extensive analysis have provided credible monthly values for the groundwater recharge in Lake Trichonis. This particular methodology can be widely applied in catchments with similar hydrologic regimes and can provide reliable, cost-efficient estimations of groundwater recharges into water bodies.Abbreviations GIS Geographical Information Systems - DTM Digital Terrain Model 相似文献
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The shallow Kastoria lake supports an important fishery but the effluent discharges from the local town renders the lake polluted and eutrophic. From a limnological point of view, its water exhibits unstable thermal stratification, dimictic as well as meromictic situations, low concentrations of dissolved oxygen close to its bottom sediments and rather high nutrient concentrations. The internationally important wetland of Mikri Prespa lake belongs to the dimictic lacustrine type. The lake is directly influenced by runoff from nearby agricultural land as well as by the organic matter produced mainly in the luxuriant bank vegetation of reeds. 相似文献
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Oil pollution effects to marine benthos in a Greek Bay 总被引：1，自引：0，他引：1
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Abstract. The interrelationships between the main phytobenthic groups of Chlorophyceae, Phaeophyceae, and Rhodophyceae around Milos Island, Central Aegean Sea, were studied using standard ecological and mathematical methods. The analysis was based on seasonal sampling of 114 different macrophytobenthic species.
The employed ecological indices revealed that the sampling areas located on the north, south, and east side of Milos Island show similar annual fluctuations in abundance and species diversity. The resemblance was particularly high between all stations in October-February, between south and east stations during May, and between north and east stations during July.
Additionally, an annual cycle of group interaction with regard to species diversity and abundance exists between the Chlorophyceae, Rhodophyceae, and Phaeophyceae. The Rhodophyceae are the most abundant and dominant group throughout the year, showing percentages in the samples higher than 70% in all sampling areas. 相似文献
The employed ecological indices revealed that the sampling areas located on the north, south, and east side of Milos Island show similar annual fluctuations in abundance and species diversity. The resemblance was particularly high between all stations in October-February, between south and east stations during May, and between north and east stations during July.
Additionally, an annual cycle of group interaction with regard to species diversity and abundance exists between the Chlorophyceae, Rhodophyceae, and Phaeophyceae. The Rhodophyceae are the most abundant and dominant group throughout the year, showing percentages in the samples higher than 70% in all sampling areas. 相似文献
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The dominant factor regulating Greek riverine dissolved inorganic solid concentrations is chemical weathering, which depends
on catchment climate and petrography. The majority of Greek rivers are moderately polluted and only a few of them show significant
human impact and an increase in pollutant concentrations over time. Due to droughts in recent years and anthropogenic influence,
the mean annual riverine dissolved solid concentrations exhibit a general interannual increase and significant long-term variations
in their intra-annual hydrochemical fluctuations. The shallow Greek lakes are eutrophic, while the deep ones are oligo-mesotrophic.
The majority of the lakes are monomictic and show summer thermal stratification, while the shallow ones are characterized
by anoxic hypolimnetic conditions. Catchment petrography is not a dominant factor in the composition of lake waters since
biochemical processes prevail. The majority of Greek lakes are also moderately polluted and are characterized by phosphorous-limited
photosynthesis.
Received: 17 March 1997 · Accepted: 16 January 1998 相似文献
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