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Stamati F Nikolaidis N Dimitriou E Koussouris T 《Journal of environmental quality》2008,37(1):164-173
The hydrologic and geochemical conditions that prevail in Mediterranean temporary ponds (MTPs), create a unique environment for many rare and endangered species. Mediterranean temporary ponds are habitats of high ecological value, which are vulnerable to imminent climatic changes, as well as to human activities. This article examines the hydrology and the nitrogen and phosphorous geochemical cycles of four MTPs in Crete. Field and laboratory studies provided the necessary information for the development of a conceptual understanding of the hydrologic and biogeochemical processes that affect the fate of nitrogen and phosphorous in these MTPs. Their hydrology was driven by deposition, infiltration, and evaporation. The hydroperiod of the ponds varied between 40 and 160 d. Mineralization and nutrient release capacity experiments illustrated the significant role that MTP sediments played in enhancing the geochemistry of the aqueous phase. Such ecosystem functions (i.e., mineralization, nutrient release) exhibited high variability among MTPs necessitating site-specific studies with immediate implications to management. It is very important to understand the local hydrogeochemical and climatic conditions to ensure appropriate environmental measures for their management and conservation. 相似文献
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Christian A. Chisholm Fotini Vavelidis Mark A. Lovell Lawrence Sweetman Charles R. Roe Diane S. Roe Frank E. Frerman William G. Wilson 《黑龙江环境通报》2001,21(10):856-859
We report the occurrence of multiple acyl-CoA dehydrogenase deficiency (MADD) in two consecutive pregnancies in a young, Caucasian, non-consanguineous couple. In the first pregnancy, the maternal serum α-fetoprotein was elevated. A sonogram showed growth delay, cystic renal disease, and oligohydramnios; the parents decided to terminate the pregnancy. Postmortem examination confirmed the cystic renal disease and showed hepatic steatosis, raising the suspicion of a metabolic disorder. The diagnosis of MADD was made by immunoblot studies on cultured fibroblasts. In the subsequent pregnancy, a sonogram at 15 weeks' gestation showed an early growth delay but normal kidneys. The maternal serum and amniotic fluid concentrations of α-fetoprotein were elevated, and the amniotic fluid acylcarnitine profile was consistent with MADD. In vitro metabolic studies on cultured amniocytes confirmed the diagnosis. A follow-up sonogram showed cystic renal changes. These cases provide additional information regarding the evolution of renal changes in affected fetuses and show a relationship with elevated α-fetoprotein, which may be useful in counseling the couple at risk. MADD should be considered in the differential diagnosis of elevated α-fetoprotein and cystic renal disease. Early growth delay may be an additional feature. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
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Anastasios Skourkeas Fotini Kolyva-Machera Panagiotis Maheras 《Environmental and Ecological Statistics》2013,20(3):445-465
This study attempts to improve upon statistical downscaling (Sd) models based on the classical approach which uses canonical correlation analysis, in order to generate temperature scenarios over Greece. Considering the long-term trends of the predictor variables (1,000–500 hPa thickness field geopotential heights—using NCEP data) and the predictand variables (observed mean maximum summer temperatures over Greece), a new Sd model is constructed. Regression models using generalized least square estimators are developed in order to eliminate the trends within the time series. The advantages of the suggested method compared to the classical method are quantified in terms of a number of distinct performance criteria, e.g., Mean squared error which is the basic criterion of the estimated downscaled values relative to the observed. Finally, the suggested Sd models are used to evaluate the effects of a future climate scenario (IPCC-SRES: A2) on mean maximum summer temperatures over Greece. The results from the climate projection indicate a temperature increase for the period 2070–2100 which is smaller than the corresponding increase from the classical approach. 相似文献
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Kanellopoulos Theodore D. Kapetanaki Natalia Karaouzas Ioannis Botsou Fotini Mentzafou Angeliki Kaberi Helen Kapsimalis Vasilios Karageorgis Aristomenis P. 《Environmental science and pollution research international》2022,29(30):45190-45190
Environmental Science and Pollution Research - 相似文献
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Kanellopoulos Theodore D. Kapetanaki Natalia Karaouzas Ioannis Botsou Fotini Mentzafou Angeliki Kaberi Helen Kapsimalis Vasilios Karageorgis Aristomenis P. 《Environmental science and pollution research international》2022,29(30):45171-45189
Environmental Science and Pollution Research - This study is a first attempt to assess the trace element contamination status in the surface sediments of the Hellenic Seas since the first... 相似文献
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