Wetlands poster

Information about Wetlands poster

Published on January 3, 2008

Author: Elliott

Source: authorstream.com

Content

Slide1:  Coastal Lagoons & Beaches e.g. Walvis Bay, Sandwich Harbour and Lüderitz wetlands Sheltered marine areas (lagoons) or beaches provide a haven for breeding and feeding coastal species Typically high in biodiversity and attract numerous bird species – in places up to 300,000 individuals and 40-50 species What are wetlands? Wetlands are areas where there is permanent or temporary surface water. Wetlands include perennial and ephemeral rivers, floodplains, pans, lakes, dams, springs, swamps, marshes, seeps, oshanas, estuaries and shallow seas and islands. Wetlands are aquatic or semi-aquatic ecosystems, each supporting its own aquatic, semi-aquatic and riparian plant and animal communities. Wetlands are among the world’s most biologically productive ecosystems and are rich in biodiversity. There are many types of wetlands found throughout Namibia, although many of them may be dry for months or years, such as ephemeral rivers, pans and floodplains. Almost 5% of Namibia’s surface area is covered by various types of wetlands, although the majority are dry most of the time. Erosion prevention – Vegetation in and adjacent to wetlands and rivers slows water flow, holds soils and prevents erosion. Aquifer recharge – Water from wetlands recharges adjacent underground aquifers. Improvement of water quality – Wetland ecosystems maintain good water quality in several ways such as filtering pollutants and breaking down dead and decaying material. Climatic stability – Wetland vegetation can act as a carbon reservoir and assists in reducing the amount of carbon dioxide in the atmosphere, decreasing the greenhouse effect and leading to a more stable climate. Linear oases – Both perennial and ephemeral rivers that pass through otherwise arid areas are sources of water and support linear strips of vegetation, enabling people and wildlife to survive there. Why are wetlands important? Wetlands provide both goods and services. They provide a variety of renewable natural resources as well as vitally important ecological services. Natural Resources: Water – Water maintains all life processes in the environment and is necessary for human health and to maintain agricultural, industrial and other activities. Vegetation – Wetland and riverine vegetation have multiple uses, such as food (fruit), medicines, building materials, etc. Animals – Animals such as marine and freshwater fish, frogs, reptiles, birds and many aquatic invertebrates are found in wetlands, while other wildlife congregates around wetland areas. Floodplains – Rivers carry sediment or silt which are rich in nutrients. These nutrients provide the basis for aquatic and adjacent terrestrial food webs. Ecological Services: Flood attenuation – Wetland vegetation regulates stream and river flow, helping to control floods. Perennial Rivers  e.g. Kunene, Okavango, Zambezi, Orange Rivers and Kwando-Linyanti-Chobe System Flow throughout the year, carrying large volumes of water Are only found along Namibia’s northern and southern borders; all originate in neighbouring countries Economics of Wetlands Most people take wetlands and wetland-services for granted and do not realize the economic value of wetlands. If these natural resources were degraded, Namibian livelihoods would be affected and people would have fewer resources available to them. If the ecological services provided by wetlands were reduced, they would need to be replaced with artificial alternatives which are extremely expensive. Tourism is an important economic incentive for the conservation and management of wetlands is tourism. With conservation, these areas can attract tourists and provide economic benefits for local communities and for Namibia. This poster was commissioned by the Namibia Nature Foundation and designed and compiled by Danica Shaw, Eco-Logic Environmental Management Consulting CC (061) 235460 Sponsors Protection of wetlands A comprehensive Wetlands Policy for Namibia has been developed which aims to integrate sustainable wetland management, protection and conservation into decision making at all levels. Current legislation and policies that are important to wetland management include: The Water Act 1954, The National Water Policy 2000, the National Agricultural Policy 1995, the Water Supply and Sanitation Policy 1993, The Water Corporation Act 1997, and Vision 2030. Namibia is a signatory to the Ramsar Convention which is the Convention on Wetlands of International Importance. The Convention recognises the economic, ecological, cultural, scientific and recreational importance of wetlands and advocates wise-use. Four wetlands in Namibia are currently designated as “wetlands of international importance,” or Ramsar sites: * Walvis Bay Lagoon * Orange River Mouth * Sandwich Harbour Lagoon * Etosha Pan What are the pressures on Namibia’s wetlands? Over-exploitation of wetland resources due to human population growth and poverty Poor integrated planning and inadequate sectoral cooperation Increasing demand for water Over-abstraction of groundwater Pollution from domestic, agricultural and industrial sources Physical alterations to natural water courses (dams, reservoirs, etc.) Alien and invasive species Urban, coastal and hydropower developments Erosion caused by deforestation and overgrazing Climate change What can be done to reduce these pressures? Promote integrated land-use management and planning, involving different sectors as well as the broad participation of all stakeholders Promote integrated water resource management Create incentives and support regulations which ensure the conservation and sustainable use of wetland resources Increase the conservation of wetland ecosystems and biodiversity Prevent water pollution in wetlands, their catchments and groundwater sources Strengthen monitoring, legislative frameworks and institutional capacity Continue and promote research and environmental assessment of wetland areas Control development in or immediately surrounding wetlands Control alien species and prevent further introduction Ephemeral Rivers  e.g. Hoanib, Huab, Ugab, Swakop, Kuiseb, Fish, and Nossob Rivers Flow after good rains, usually for a few days to a few weeks only, and sometimes not for several years Most originate within Namibia – the majority of Namibia’s rivers are ephemeral Serve as ‘linear oases’ – provide underground water and maintain dense riparian vegetation that is used by humans, livestock and wildlife in arid areas Floodplains  e.g. areas alongside the Okavango and Zambezi Rivers and the Kwando-Linyanti-Chobe System Typically low-lying areas next to rivers where water overflows in times of seasonal flooding Support diverse populations of mammals, birds, fish, reptiles, invertebrates, plants and people. Oshanas  e.g. the Cuvelai drainage area Complex delta network of interlinked shallow channels and pans in north-central Namibia which receives both local seasonal rain and inflow from Angola Provide fish and other food resources when in flood, and recharges the water table in the cuvelai regions Pans  e.g. Etosha Pan, Nyae-Nyae Pan, Sossousvlei and Kalahari pannetjiesveld Shallow ephemeral pools, often salt-lined, fed by local rainfall or ephemeral rivers Sinkhole Lakes  e.g. Otjikoto and Guinas Lakes, Aigamas Cave, and Dragon’s Breath Deep, permanently filled caverns formed when the roof of an underground cave collapses (Namibia has some of the largest underground lakes in the world!) Support unique endemic invertebrates and fish Swamps/Marshes  e.g. Linyanti swamp, confluence of Cuito and Okavango Rivers Well vegetated areas with permanently water-logged soils Found alongside perennial rivers, at confluence of rivers or in coastal areas (salt marsh) Typically high in biodiversity Vleis  e.g. Tsumkwe vleis (Makuri Pan), rainwater pools in Caprivi and Otjozondjupa regions Shallow well-vegetated pools fed by local rainfall or groundwater seepage – can be either seasonal or permanent Springs/Seeps  e.g. Sesfontein, Karstveld, Damaraland, Naukluft, Ai-Ais and Gross Barmen springs Permanently vegetated pools or streams formed by artesian water or by groundwater raising to the surface Geothermal springs are biologically harsh environments, but are popular tourist attractions Estuaries  e.g. Kunene River mouth, Orange River mouth Areas at the mouths of perennial rivers Experience river and tidal flows – alternation of freshwater and saline water Sensitive and highly productive ecosystems Dams/Impoundments  e.g. Hardap, von Bach, and Olushandja Dams Artificial bodies of water created by damming the flow of river water Built for human use – water storage, supply to urban areas, agriculture, hydroelectric power (not yet in Namibia), recreation, etc. Constructed Wetlands  e.g. Evaporation ponds at sewage works or abattoirs, artificial ponds, and canals Artificial discharge areas for waste water treatment In some cases, they are specially designed to partially purify waste water for alternative uses Water transfer canals, such as Eastern National Water Carrier Explanation of Terms: aquatic: relating to water aquifer: layers of permeable material such as sand, surrounded by non-permeable rock, which hold water. Aquifers are sources of groundwater. biodiversity: the variety of life on all levels. Biodiversity includes genetic variation within a species, the diversity of species and the variety of communities and ecosystems. ecosystem: the combination of all the living and non-living factors which make up an environment and its organisms ephemeral: flowing only for a short time after good rains geothermal: relating to heat from the interior of the Earth greenhouse effect: the warming of the Earth as a result of the release of gases, mostly from burning fossil fuels perennial: flowing throughout the year riparian: relating to a river bank semi-aquatic: relating to the area between aquatic and terrestrial zones terrestrial: relating to dry land

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