Nenjiang River grassland | |
---|---|
Ecology | |
Realm | Palearctic |
Biome | Flooded grasslands and savannas |
Geography | |
Area | 23,310 km2 (9,000 sq mi) |
Countries | China |
Coordinates | 45°15′N124°15′E / 45.250°N 124.250°E |
The Nenjiang River grassland ecoregion (WWF ID: PA0903) covers the low wetlands of the lower Nen River (Nenjiang River) in northeast China. The region is known for supporting migratory and permanent nesting populations of a variety of migratory waterfowl, including six species of crane. [1] [2]
The Nenjiang River plain is surrounded by low mountains - the Lesser Khingan to the west, the Greater Khingan to the north, and the Changbai Mountains along the Korean border to the south. The Nenjiang River carries sediment down from the north, before emptying into the Songhua River in the ecoregion. Because the surrounding plain is relatively poorly drained, the grasslands are periodically flooded.
The climate of the Nenjiang ecoregion is Humid continental climate, hot summer (Köppen climate classification (Dwa)), with a dry winter. This climate is characterized by large seasonal temperature differentials and a hot summer (at least one month averaging over 22 °C (72 °F)), and cold winters having monthly precipitation less than one-tenth of the wettest summer month. [3] [4] Mean annual precipitation is 400 to 450 mm/year, concentrated in the spring and summer rainy season. [1]
The ecoregion's habitats are characterized by patches of swampy coniferous forests (Larch (Larix gmelini) with an under-story of birch (Betula)) surrounded by meadows of grasses and sedges. [1] Also among the meadows are freshwater or brackish lakes edged with reed beds.
The extensive network of rivers and lakes, and seasonally flooded wetlands, are notable for supporting several species of crane, including breeding populations of the endangered Red-crowned crane, the vulnerable White-naped crane, and the critically endangered Siberian crane. A permanent population of 350 red-crowned cranes winter in the ecoregion. [5] The wetlands also support 42 species of fish, and several species of amphibians, including the Heilongjiang brown frog ( Rana amurensis ). [1]
Within the ecoregion are two significant protected areas:
Khingan Nature Reserve is a Russian 'zapovednik', located in the extreme south-east of the Amur River region of the Russian Far East. The reserve covers two types of habitat: the flat Arkharinskaya lowlands with abundant wetlands, and forested spurs of the Lesser Khingan mountains. In particular, Khingan Reserve was created to protect steppe and forest-steppe landscapes, and nesting sites of the endangered Red-crowned crane and the vulnerable White-naped crane. The reserve is situated in the Arkharinsky District of Amur Oblast.
Belogorye Nature Reserve is a Russian 'zapovednik', one of the last intact riverine old-growth oak forests, which was once representative of the East European forest-steppe. The reserve is one of the oldest and smallest nature reserves in Russia, first formed in 1924 but reorganized several times since. It is on the southwestern slope of the Central Hills on the western edge of Russia. The reserve is situated in the Belgorodsky District of Belgorod Oblast. The reserve was created in 1935, and covers an area of 2,131 ha (8.23 sq mi).
Rostov Nature Reserve is a Russian 'zapovednik' that protects a variety of sensitive southern European steppe wetlands, the largest herd of wild horses in Europe, and also wetland habitat for birds. The protected areas are divided into five sections that cover the waters of Lake Manych-Gudilo, islands in that lake, surrounding steppe and shore lands. The reserve is situated in the Orlovsky District, of Rostov Oblast, about 100 km northeast of Rostov-on-Don. It is part of a Ramsar Wetland site of international importance.
Bolon Nature Reserve is the oldest Russian 'zapovednik' in the Russian Far East. It is located on the Middle Amur River lowlands adjacent to the south-west of Lake Bolon. The reserve covers the wetlands of international importance. Large numbers of migratory waterfowl use the area for nesting and stopovers on long flights. The reserve is situated half way between the city of Khabarovsk and Komsomolsk-on-Amur, in the Amursky District of Khabarovsk Krai. The reserve was created in 1997, and covers an area of 100,000 ha (390 sq mi).
Kaluzhskiye Zaseki Nature Reserve is a Russian zapovednik. Zaseki in Russian means abatises, field fortifications made of felled trees. In medieval times, the Kaluga region was part of the defensive line between the Russian forests to the north and potential invaders from the south. The reserve has been protected in some form for a thousand years, and remains old-growth forest. The reserve is situated in the Ulyanovsky District, Kaluga Oblast. It was formally established in 1992 and has an area of 18,533 hectares (71.56 sq mi).
Oka Nature Reserve is a Russian 'zapovednik' located in the Meschera lowlands, the floodplain of the Oka River and the Pra River. With extensive lowland rivers and forested peatlands, the reserve is an important area for waterfowl and waders. The reserve hosts breeding centers for bison and for crane. The site is situated in the Spassky District, Ryazan Oblast, about 60 km northeast of the city of Ryazan. In 1994, the "Flood plains of Rivers Pra and Oka" was designated a Ramsar wetland of international importance. The site was designated a UNESCO Man and Biosphere (MAB) reserve in 1978. The reserve was formally established in 1935, and covers an area of 55,722 ha (215.14 sq mi).
Azov–Syvash National Nature Park is a national park of Ukraine, located on Byriuchyi Island in the northwestern Sea of Azov. The park was created to protect the unique coastal environment of the north-western Azov. It is particularly important as a stop on the flyway for migratory birds, with over a million birds visiting each year. It is located in Henichesk Raion of Kherson Oblast. The park was created on 25 February 1993 and has the area of 52,582.7 hectares (203.023 sq mi).
The Ussuri broadleaf and mixed forests ecoregion covers a mountainous areas above the lower Amur River and Ussuri River in Primorsky Krai and Khabarovsk Krai in the Russian Far East. The ecoregion is in the Palearctic realm, with a Humid Continental climate. It covers 187,357 km2 (72,339 sq mi).
Pryazovskyi National Nature Park is the second largest national park of Ukraine, covering the estuaries, coastal plains seaside landforms around the Molochna River estuary the Utlyuksky estuary, on the northwest coast of the Sea of Azov. The area is one of high biodiversity, protecting both steppe and aquatic habitats, and the unique transition zones in between. The wetlands support very large populations of nesting and migratory waterfowl. The park is crosses several administrative districts, including Pryazovske Raion, Melitopol Raion, Berdiansk Raion, and Yakymivka Raion in Zaporizhzhia Oblast.
The Suiphun–Khanka meadows and forest meadows ecoregion is a relatively small ecoregion centered on Lake Khanka, a fresh water lake in the Russian Far East, with a portion in China. The terrain is unforested, flat, and marshy. The area is an important stopover spot for migratory birds, including many vulnerable species. It has an area of 33,929 square kilometres (13,100 sq mi), and is in the Flooded grasslands and savannas biome.
The Amur meadow steppe ecoregion is spread over two sections of the middle Amur River valley in the Russian Far East. The terrain is one of flat floodplains on alluvial soil. Due to high water table and frequent flooding, the area has remained relatively forest-free, and is today characterized by extensive wetlands of bogs and grasslands. The area remained ice-free during the Pleistocene glaciation, creating a refuge for many plant and animal species. It has an area of 123,283 square kilometres (47,600 sq mi).
Lower Dniester National Nature Park covers a large portion of the Dniester River Estuary where it enters the Black Sea in southwestern Ukraine. The floodplains and waterways are important to nesting and wintering waterfowl. They are also important for spawning fish: over 70 species of fish in 20 groups are recorded in the park. The boundaries include two Ramsar wetland sites of international importance. The park is about 30 km west of the city of Odesa, in Bilhorod-Dnistrovskyi and Odesa Raions in Odesa Oblast.
Prypiat-Stokhid National Nature Park was created in 2007 to protect and unify a series of natural complexes of the Pripyat River and Stokhid River valleys in northwestern Ukraine. The park provides protection, research areas, and recreation representative of the meadows and wetlands of the Polissia biosphere region. The park supports two Ramsar wetlands of international importance, and are joined in a cross-boundary Ramsar wetland with Belarus. The park is in the administrative district of Liubeshiv in Volyn Oblast.
Opuk Nature Reserve is a protected nature reserve located on the southern coast of the Kerch Peninsula on the Black Sea. It is centered on a limestone massif rising from the kerch plains, and a salt lake. The site is a Ramsar Wetland of International Importance.
The Northeast China Plain deciduous forests ecoregion covers the flat interior Northeast China Plain and neighboring adjacent northwestern North Korea, in the region historically known as Manchuria. The plain is surrounded by mountains on the north and east, and supports some of China's largest forest tracts. There are also extensive low-lying wetlands, which support important bird populations.
The Bohai Sea saline meadow ecoregion covers the coastal deltas of the Yellow River and the Luan River where they enter the Bohai Sea in China. The saline meadows and intertidal mudflats provide an important stopping-over point for birds migrating on the East Asian–Australasian Flyway. The region is under heavy ecological pressure from human development.
The Yellow Sea saline meadow ecoregion covers a thin strip of wetlands between the Shandong Peninsula and the mouth of the Yangtze River on the coast of the East China Sea. The plants of the region are adapted to the wet, saline soils transitioning inland to fresh water arriving from the west. The area is an important stop-over on the East Asian–Australasian Flyway. The region is under heavy ecological pressure from human development and agriculture.
The Manchurian mixed forests ecoregion covers the forested hills surrounding the river plains of northern China, Russia, North Korea, and South Korea. The ecoregion supports a number of rare species due to the relative isolation, the diversity of habitat, with mixed forests of deciduous Mongolian oak and conifers of Korean pine. Because mountains rise above the region on three sides, with plains and wetlands below, the area supports high biodiversity as a transition zone.
The Gulf of Fonseca mangroves ecoregion covers the brackish mangrove forests around the Gulf of Fonseca on the Pacific Ocean. The Gulf is the meeting point El Salvador, Honduras, and Nicaragua. The Gulf is one of the two primary nesting sites of the critically endangered Hawksbill turtle in the eastern Pacific. In the Honduras portion, there are seven nature reserves that collectively make up a RAMSAR wetland of international importance, providing protection for migratory birds, sea turtle, and fish.
The Usumacinta mangroves ecoregion covers the mangrove forests ont the Gulf Coast of Mexico, around the margins of the Laguna de Términos. The "Ends" in the name refer to the mouths of the rivers that empty into the lagoon, including the Usumacinta River. This region, which is due south of the mouth of the Mississippi River across the Gulf of Mexico, receives an estimated one-third of the wintering birds migrating on the Mississippi Flyway. It is estimated that the lagoon supports 90 endangered species.