The definition and classification of wetlands under the Ramsar Convention

Wetlands are vital ecosystems recognised globally for their ecological importance. The Ramsar Convention, an international treaty focused on wetland conservation, provides a broad definition and detailed classification system for these areas.

What are wetlands according to the Ramsar Convention?

• Definition - Wetlands are described as areas of marsh, fen, peatland, or water, which can be natural or artificial, permanent or temporary. The water in these areas may be static or flowing and can be fresh, brackish, or saline.
• Global coverage - Wetlands currently make up just 6% of the Earth's surface.
• Breakdown of wetland types - Of this 6%, the distribution includes:
  • Bogs: 30%
  • Fens: 26%
  • Swamps: 20%
  • Floodplains: 15%
  • Lakes: 2%

Classification of wetlands

• Broad categories - Wetlands are grouped into marine, coastal, and inland types.
• Detailed subdivisions - These are further split into 30 categories of natural wetlands and 9 categories of human-made wetlands, such as reservoirs, barrages, and gravel pits.

The social, economic, and environmental value of wetlands

Wetlands offer a wide range of benefits that support human communities, economies, and natural ecosystems. These benefits can be categorised into functions, products, and attributes.

Benefits provided by wetlands

• Functions - Flood control, sediment accretion and deposition, groundwater recharge, groundwater discharge, water purification, storage of organic matter, food-chain support/cycling, water transport, tourism/recreation
• Products - Fisheries, game, forage, timber, water
• Attributes - Biological diversity, culture and heritage

These contributions highlight why wetlands are often referred to as the 'kidneys of the landscape' due to their role in filtering water and supporting life.

Causes of wetland loss and degradation

Despite their importance, wetlands are under threat worldwide due to a variety of human and natural factors that lead to their loss or degradation.

Factors contributing to wetland decline

• Agricultural expansion - Growing demand for farmland results in wetlands being drained or converted for crop production.
• Population growth - Increasing human populations put pressure on wetland areas for settlement and resources.
• Infrastructure development - Construction of roads, buildings, and other facilities often destroys or fragments wetland habitats.
• River flow regulation - Dams and canalisation alter natural water flows, disrupting wetland ecosystems.
• Invasive species and pollution - Non-native species can outcompete local flora and fauna, while pollution degrades water quality and habitat health.
• Natural causes - Events like droughts and hurricanes can damage or destroy wetland areas through water scarcity or physical destruction.

The Kissimmee River restoration project as a case study in wetland conservation

The Kissimmee River in Florida, USA, serves as a powerful example of both the detrimental impacts of human intervention on wetlands and the potential for large-scale restoration to reverse such damage.

Background to the Kissimmee River project

• Initial alteration - Between 1962 and 1971, the Kissimmee River was engineered into a 90-kilometre, straight drainage canal, deepened and widened to a depth of around 10 metres for flood protection.
• Environmental impacts - This channelisation led to severe ecological consequences:
  • Loss of between 2,000 and 14,000 hectares of wetlands.
  • A 90% drop in the use of the area by wading birds and waterfowl.
  • A sustained decline in game fish populations over time.

Restoration efforts and costs

• Project timeline - From 1999 to 2015, a massive restoration initiative was undertaken, supported by state and federal funding, to revive over 100 square kilometres of river and wetland areas, creating approximately 11,000 hectares of restored wetlands.
• Financial cost - The project required an investment of over $410 million.
• Potential drawback - Restoration of the floodplain could lead to greater water loss through evapotranspiration during periods of high rainfall.

Benefits of the restoration

• Ecosystem recovery - Higher water levels have begun to support a natural river ecosystem once again.
• Water quality improvement - Reestablished floodplain wetlands have enhanced nutrient filtration, reducing nutrient loads flowing into Lake Okeechobee.
• Wildlife return - Key bird species, including wading birds and waterfowl, have repopulated the area, with some populations increasing by over 200%.
• Aquatic health - Dissolved oxygen levels in the water have risen significantly, doubling in some areas, which is essential for fish and other aquatic life.
• Economic potential - Increased opportunities for recreational activities like hunting and fishing, alongside ecotourism, are expected to boost local and regional economies.