As a result of decreased loading with organic matter from industrial origin water quality of the different sites is improving and entire ecological situation of the Mesta River is getting better. The water ecosystem is subjected to organic pollution determining saprobic processes irrelatively pure form and wide range of the saprobity.
Conditionally two main periods, determining ecological situation in the Mesta River, were described: As regards to macrozoobenthos a considerable data-massif including long-term period is composed. Gradual decreasing of total water discharge following global changes and aridisation of the regions, especially in its southern sectors of the basin and watercourse.
Mesta river was selected as a model watercourse as far as its ecological status has been well studied for the last 30 years in terms of it hydrology, water quality, benthic invertebrate fauna, community trophic structure, and other ecological quality elements.
Mesta catchments basin is situated in the zone of the European-continental climatic influence and snow-rainy. Considerably fewer are the data on the other three biological elements of Mesta River, which to date has not been an object of regular and long term investigation.
Bulgarian part of the Mesta River has km length with catchments area surface 2 km2 and 25 tributaries along the river. The last three decade investigations are connected mainly with detail studies on the species diversity and trophic structure of the macrozoobenthos.
The status of protected areas of most of the right-side tributaries in high-mountains preserves water quality, but not the amount of potential water abstraction for increasing human needs.
The biggest one is Dospat that flows into Mesta in the Greece territory. Left-side tributaries suffer from intensive deforestation of large areas and thus minimizing the water generation capacity of the watershed.
Altitude of Bulgarian part of the river varies between m.
At the Bulgarian territory Mesta River is mountain stream with average altitude of the catchments area m what define it as a highest river valley in Bulgaria.
The system offers a possibility of the ecological situation variety and river types as well as developed river system and indicative basic continuum gradients.History of Wetlands in the Conterminous United States Interest in the preservation of wetlands has National Water Summary-Wetland Resources: OVERVIEW OF WETLAND RESOURCES.
VIRt,INIA I\ORTH Albemarle CAROLINA Sound Washington County Great Dismal Swamp. Wetlands occupy transitional zones between well-drained uplands and permanently flooded deepwater habitats Wetlands are ecosystems that arise when inundation by water produces soils dominated by anaerobic processes and forces the biota, particularly rooted plants, to exhibit adaptations to tolerate flooding.
Constructed wetlands not only reclaim water but provide needed habitat for wildlife.
Even a small one (20’ x 20’) will serve as a lush oasis, attracting birds, butterflies, toads and other animals. The first single-family home constructed wetland in.
Designed to be an overview of how wetland systems can be used to manage wastewater, this brochure introduces the following topics: What wetland systems Constructed wetlands mimic the water purification properties of natural wetland systems. These constructed wetlands use the same plants, soils, and microorganisms as natural.
The integrated monitoring program includes more than 80 standardised and scientifically supervised methodological protocols producing up to date results on biodiversity status and natural processes trends.
The formation, persistence, size, and function of wetlands are controlled by hydrologic processes. Distribution and differences in wetland type, vegetative composition, and soil type are caused primarily by geology, topography, and climate.Download