An estuary is a partially enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea. Estuaries form a transition zone between river environments and maritime environments and are an example of an ecotone. Estuaries are subject both to marine influences such as tides, waves, and the influx of saline water, and to fluvial influences such as flows of freshwater and sediment. The mixing of seawater and freshwater provides high levels of nutrients both in the water column and in sediment, making estuaries among the most productive natural habitats in the world.
Wetlands, or simply a wetland, is a distinct ecosystem that is flooded or saturated by water, either permanently or seasonally. Flooding results in oxygen-free (anoxic) processes prevailing, especially in the soils. The primary factor that distinguishes wetlands from terrestrial land forms or water bodies is the characteristic vegetation of aquatic plants, adapted to the unique anoxic hydric soils. Wetlands are considered among the most biologically diverse of all ecosystems, serving as home to a wide range of plant and animal species. Methods for assessing wetland functions, wetland ecological health, and general wetland condition have been developed for many regions of the world. These methods have contributed to wetland conservation partly by raising public awareness of the functions some wetlands provide.
Freshwater ecosystems are a subset of Earth's aquatic ecosystems. They include lakes, ponds, rivers, streams, springs, bogs, and wetlands. They can be contrasted with marine ecosystems, which have a larger salt content. Freshwater habitats can be classified by different factors, including temperature, light penetration, nutrients, and vegetation. There are three basic types of freshwater ecosystems: Lentic, lotic and wetlands. Freshwater ecosystems contain 41% of the world's known fish species.
A Ramsar site is a wetland site designated to be of international importance under the Ramsar Convention, also known as "The Convention on Wetlands", an intergovernmental environmental treaty established on 2nd February 1971 in Ramsar, Iran by UNESCO, which came into force from 21st December,1975. It provides for national action and international cooperation regarding the conservation of wetlands, and wise sustainable use of their resources. Ramsar identifies wetlands of international importance, especially those providing waterfowl habitat.
Sundarbans is a mangrove area in the delta formed by the confluence of the Ganges, Brahmaputra and Meghna Rivers in the Bay of Bengal. Sundarban Reserve Forest (SRF) of Bangladesh is the largest mangrove forest in the world. It spans the area from the Baleswar River in Bangladesh's division of Khulna to the Hooghly River in India's state of West Bengal. It comprises closed and open mangrove forests, land used for agricultural purpose, mudflats and barren land, and is intersected by multiple tidal streams and channels. Sundarbans is home to the world's largest area of mangrove forests. Four protected areas in the Sundarbans are enlisted as UNESCO World Heritage Sites, viz. Sundarbans West (Bangladesh), Sundarbans South (Bangladesh), Sundarbans East (Bangladesh) and Sundarbans National Park (India).
An aquatic ecosystem is an ecosystem found in and around a body of water, in contrast to land-based terrestrial ecosystems. Aquatic ecosystems contain communities of organisms—aquatic life—that are dependent on each other and on their environment. The two main types of aquatic ecosystems are marine ecosystems and freshwater ecosystems. Freshwater ecosystems may be lentic ; lotic ; and wetlands.
Guanacaste Conservation Area is an administrative area which is managed by the Sistema Nacional de Areas de Conservacion (SINAC) of Costa Rica for conservation in the northwestern part of Costa Rica. It contains three national parks, as well as wildlife refuges and other nature reserves. The area contains the Area de Conservación Guanacaste World Heritage Site, which comprises four areas.
The Alaksen National Wildlife Area is located on Westham Island in the city of Delta, British Columbia. It is an important stopover point for many species of birds migrating along the Pacific Flyway.
The wildlife of Liberia consists of the flora and fauna of the Republic of Liberia. This West African nation has a long Atlantic coastline and a range of habitat types, with a corresponding diversity of plants and animals. Liberia is considered a biodiversity hotspot and has more intact forests characteristic of the Upper Guinea Massif than do neighbouring countries. There are 2000 species of vascular plants, approximately 140 species of mammals, and over 600 species of birds.
The Port Phillip Bay and Bellarine Peninsula Ramsar Site is one of the Australian sites listed under the Ramsar Convention as a wetland of international importance. It was designated on 15 December 1982, and is listed as Ramsar Site No.266. Much of the site is also part of either the Swan Bay and Port Phillip Bay Islands Important Bird Area or the Werribee and Avalon Important Bird Area, identified as such by BirdLife International because of their importance for wetland and waterbirds as well as for orange-bellied parrots. It comprises some six disjunct, largely coastal, areas of land, totalling 229 km2, along the western shore of Port Phillip and on the Bellarine Peninsula, in the state of Victoria. Wetland types protected include shallow marine waters, estuaries, freshwater lakes, seasonal swamps, intertidal mudflats and seagrass beds.
Mangrove ecosystems represent natural capital capable of producing a wide range of goods and services for coastal environments and communities and society as a whole. Some of these outputs, such as timber, are freely exchanged in formal markets. Value is determined in these markets through exchange and quantified in terms of price. Mangroves are important for aquatic life and home for many species of fish.
The Jiwani Coastal Wetland is a wetland located in Balochistan, Pakistan, near the town of Jiwani. The site is one of the 19 Ramsar sites in Pakistan and was inducted in 2001.
The Point Cook Coastal Park covers an area of 863 hectares and includes the Cheetham Wetlands. The park extends from the RAAF Williams Point Cook Base northeast along the coast to the Laverton creek which comprises its northern boundary. The park is approximately 20 kilometres (12 mi) from Melbourne, Australia in a southwesterly direction along Port Phillip Bay. The park is adjoined by the Point Cook Marine Sanctuary, which extends around the point to the south and the east. The northwestern boundary to the park is residential housing.
Biodiversity in Suriname is high, mostly because of the variety of habitats and the temperature. The average annual temperature in the coastal area is between 26° and 28° Celsius. Suriname can be divided into four major ecological zones, namely from north to south;
- The young coastal plain
- The old coastal plain
- The Savannah or Zanderij belt
- The interior residual uplands.
The Red River Delta Biosphere Reserve is a UNESCO biosphere reserve in the coastal region of northern Vietnam. Mangroves and intertidal habitats of the Red River Delta form wetlands of high biodiversity especially in the Xuan Thuy and Tien Hai districts. These wetlands are of global importance as migratory sites for several bird species.
For a small country, Albania is characterised by a considerable wealth of terrestrial and marine ecosystems and habitats with contrasting floral and faunal species, defined in an area of 28,748 square kilometres. Most of the country is predominantly of Mediterranean character, comprehending the country's center and south, while the alpine affinity is more visible in the northeast.
The Albanian Adriatic Sea Coast stretches in the Southeastern Adriatic Sea beginning at the Gulf of Drin in the north, across the port cities of Shëngjin, Durrës and Vlorë, to the Bay of Vlorë in the south, where the Albanian Riviera as well as the Albanian Ionian Sea Coast begins.
The East African coral coast is a marine ecoregion along the eastern coast of Africa. It extends along the coasts of Kenya, Tanzania, and northern Mozambique, from Lamu in Kenya to Angoche in Mozambique. It adjoins the Northern Monsoon Current Coast ecoregion to the north, and the Bight of Sofala/Swamp Coast ecoregion to the south.
Qurm Nature Reserve is a national nature reserve in Muscat Governorate, Oman. Located on the Gulf of Oman coast, the reserve protects a mangrove forest and the surrounding wetland in a small estuary within the urban area of Qurm. Established in 1975, the reserve has been designated as an Important Bird Area since 1994, and as a protected Ramsar site since 2013.
