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 96
- Downloads 0
Growth response and survival of Heterobranchus longifilis cultured at different water levels in outdoor concrete tank
Thirteen-day-old hatchery-raised fry obtained from hormonally-induced spawns of mature African catfish H. longifilis broodstock were introduced to three different water levels (0.35, 0.50 and 0.65 m) in four replicates i...
Researches regarding the influence of royal jelly on sex reversal in zebra fishes (Danio rerio).
In this study we observed the influence of royal jelly on sex reversal in zebra fishes (Danio rerio). Experiments were made in the laboratories of aquaculture from Faculty of Animal Science and Biotechnologies, Timișoara...
Aspects of the biology of grey mullet, Mugil cephalus, in Lagos lagoon,Nigeria.
Investigations were conducted in Lagos lagoon, Nigeria between February 2009 and January 2010 on the biological aspects of grey mullet, Mugil cephalus with aim that information obtained from the study will contribute to...
Some aspects of branchial parasitism in Leuciscus cephalus (Teleostei, Cyprinidae): first record of Lamproglena compacta (Cyclopoida, Lernaeidae) in Romania
The present paper records for the first time the presence of the crustacean copepod Lamproglena compacta in the branchial microhabitat of the cyprinid species Leuciscus cephalus that belongs to a lotic Romanian ecosystem...
Reef aquariofily: a hobby for everyone? How an adequate knowledge of Pterois volitans’ behavior and welfare can avoid risks and accidents.
Pterois volitans (Linnaeus, 1758) is one of the most appreciated fish in the common reef aquariology but, unfortunately, a potentially dangerous subject due to its venom glands, which can cause injuries and envenomations...