Comparative studies of the global ecological state variation of the aquatic environment in the Crişuri Hydrographic Space between 2007 and 2009.
Journal Title: Aquaculture, Aquarium, Conservation & Legislation - International Journal of the Bioflux Society - Year 2011, Vol 4, Issue 2
Abstract
The paper presents a comparative study regarding the evolution across time of the quality of aquatic eco-systems in the Crişuri Hydrographic Space (CHS), between 2007 and 2009. Having as a goal a real and complete image of the quality of the environment in the CHS, the ecological monitoring conducted was meant to observe the structure of the aquatic communities (macrozoobenthos, microphytobenthos, phytoplankton) and the biotope characteristics (physical and chemical parameters of water: pH, conductivity, dissolved oxygen, CBO5, CCO-Mn, CCO-Cr, nitrites, nitrates, phosphates, amonium, chlorophyll “a”, chlorides, sulphates, fix residues, As, Hg, Cu, Zn, Mn, phenols, detergents etc). The choosing of the monitoring sections, their identification and geographical position were accomplished in 2006. The basic criterion in the choice of the monitoring sections was the identification of all aspects that can influence the quality state of the waters. The monitoring of the quality state of the waters in the CHS was conducted in 40 sections, both on the main courses and their affluents, over a 3-year period. After the results of the analyses of physico-chemical and biological samples were obtained, the categorization of the prelevation sections in quality classes followed; depending on these classes, the modelation of the global ecological states of the watercourses in the CHS was realized by means of mapping techniques (GIS). Most of the monitoring sections were in the good ecological state category. The very good ecological state was determined only for those sections upstream all polluting sources. Nevertheless, some of the prelevation points exceeded both physico-chemically and biologically the limits of the good quality state, entering the category of moderate quality state. No watercourse in the CHS was determined for poor or bad quality state. Generally, a “preservation” of the quality state of the waters from one year to the following was noticed, although some monitoring points registered an improvement of the global ecological state, whereas others, a degradation. The improvement (eg. prelevation sections Râbiţa on Crişul Alb, Pădurea Neagră on Barcău or upstream Huedin on Crişul Repede) is mainly due to the lower quantity of mis-/untreated residual water upstream the monitoring sections.
Authors and Affiliations
Istvan Gergely, Julieta-Emilia Romoce, Corina Sion (Badalan)
Keywords
Related Articles
- EP ID EP145277
- DOI -
- Views 120
- Downloads 0
Feasibility of the sustainable freshwater cage culture in Hungary and Romani
The intensive cage culture has an adverse effect on the quality of waters due to the high nutrient discharge of intensive fish culture. The combination of the intensive cage and the extensive aquaculture exploits the...
Immunomodulatory effects of turmeric, Curcuma longa (Magnoliophyta, Zingiberaceae) on Macrobrachium rosenbergii (Crustacea, Palaemonidae) against Vibrio alginolyticus (Proteobacteria, Vibrionaceae
Macrobrachium rosenbergii is being favored for farming due to its large size. However, like other crustaceans, it is also prone to bacterial and viral infections. Turmeric, a derivative of the plant Curcuma longa, is a s...
Summary of results of population density surveys of the Banggai cardinalfish in the Banggai Archipelago, Sulawesi, Indonesia, from 2007 –2012
The unique endemic Banggai cardinalfish (Pterapogon kauderni)(BCF) is still among the top 10 imported species of marine aquarium fish in the US. The fish has been classified as an endangered species due to concerns over...
Evaluation of seasonal variations in physicochemical parameters of Taleghan River, northern Iran
In this study an experiment on water quality of Taleghan River between August 2008 and July 2010 was conducted. Twenty four samples from 6 stations along the river were taken monthly. Parameters like temperature, dissolv...
[sup][/sup]Acute toxicity of Nigerian crude oil (Bonny Light) to Desmocaris trispinosa (Crustacea, Palaemonidae)
The acute toxic effects of a Nigerian crude oil (Bonny Light) to freshwater shrimp, Desmocaris trispinosa were studied in toxicity bioassay. The test organisms were exposed to crude oil in a static renewal bioassay...