The objective of this work was the assessment of seawater quality in Thermaikos Gulf, Pagassitikos Gulf and Skiathos island in Northern Aegean Sea by the use of bioassays. Two bioassays using marine organisms as indicators of seawater quality were applied in this study; the invertebrate Artemia franciscana and the marine bioluminescent bacterium Vibrio fischeri. Bioassays are required for the integrated evaluation of water pollution, as physical and chemical tests alone are not sufficient enough for the assessment of potential effects on aquatic organisms. According to the result of this study, improvement in coastal water quality of Thermaikos Gulf was observed between September 1997 and April-May 2000. However, coastal water quality of Pagassitikos Gulf varied during the test period; it was generally good during April-May 2000, while in October 1999 it was generally poor. Between the two bioassays that have been applied in this study, the Microtox test, where the marine bacterium V. fischeri was used as a test organism, was more sensitive in detecting toxicity in seawater.
Primarily, this is a discussion and review of the general European policies of management protection in the perspectives of the new CAP (Common Agriculture Policy). There are some technical proposals in Thessaly for agriculture and environmental management with the contribution of a voluntary group such as the Working Team "Natural environment" (WTNE) in Natura 2000 and SPA (Special Protection Areas) by following a strategic PLAN. The fundamental problem and concept that this article examines is if the sustainable confrontation or approach can be better improved via means of the effectiveness and the short-term "valorization / utilization" of natural resources or if solutions should be found or proposed via means of long-term "conservation" of resources. Consequently, the completion of works, as paradigm, of 'Karla' reservoir dam's plain (collectors, water reservoir, etc.) and the beginning of projects for exploitation -valorization, created a reflection in regard to the type and manner of water consumption and the more general development and the valorization of level areas in Thessaly, Greece. The choice between different sustainable management solutions, except the solely "economic effects", will be supposed to include the parameter "environment" and it approaches the question of "exploitation -valorization" of resources in a context of effectiveness and "conservation" of resources.
In this article, emphasis is placed on Environmental Planning and prevention of water flood disasters because of problems arising from the application of Directive 2000/60/EU. Thus, a study and a review are conducted, both on the way in which the climate (water) acts upon the space, aiding significantly in the methodology of partitioning, and the relationship between the environment of streams or torrents and its factors and human activities. The question posed is the following: How and with which methods can be achieved the best environmental connection and use of torrents on Environmental planning, when it is well known that torrents in Greece are greater in number and cover a greater area than rivers? Towards the end, various viewpoints of other researchers are presented, which methodologically lead the present article to a new method of approach, deriving both from the way in which the question of water is dealt with, with respect to prevention of water flood disasters, together with human structures for Environmental Planning, and from examining the merits of many applied examples.
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