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Ōike
is a karst pond on Minamidaitōjima, Okinawa Prefecture, Japan. Ōike is the largest pond containing both freshwater and seawater. It covers , the circumference is , and it is at its deepest point. Fresh water is mixed with seawater beneath. Geology The island is composed of elevated limestone from its atoll. Rainwater has dissolved the limestone leading to a depression in the ground (sinkhole). This has filled with water to become a pond. Natural history On the north of the pond extends an area of wetland with large communities of Bruguera gymnorrhiza, a mangrove plant, which was designated as a Natural monument since it is unique in freshwater on March 18, 1975. Other plants include ''Scirpus tabemaemontani C. C. Gemlin, Panicum repens L. Najas marina'' and ''Vallisneria natans''. Common carp and ''Carassius auratus langsdorfii'' were introduced in 1910 and tilapia in 1955. Birds include mallard, Pacific reef heron, common moorhen and cattle egret.Environmental Agency''T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Minamidaitōjima
, also spelt as Minami Daitō or Minami-Daitō, is the largest island in the Daitō Islands group southeast of Okinawa, Japan. It is administered as part of the village of Minamidaitō, Okinawa. Shimajiri District, Okinawa and has a population of 2,107. The island is entirely cultivated for agriculture. The island has no beaches but has a fishing boat harbor and three cargo and ferry ports; as well as an airport Minami Daito Airport (airport code "MMD"). Geography Minamidaitōjima is a relatively isolated coralline island, located approximately south of Kitadaitōjima, the second largest island of the archipelago, and from Naha, Okinawa. As with the other islands in the archipelago, Minamidaitōjima is an uplifted coral atoll with a steep coastal cliff of limestone (the former fringing coral reef of the island), and a depressed center (the former lagoon of the island). The island is roughly oval in shape, with a circumference of about , length of and an area of . The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carassius Auratus Langsdorfii
The ginbuna (''Carassius langsdorfii''), sometimes referred to as silver crucian carp or Japanese silver crucian carp, is a species of freshwater fish in the carp family (family Cyprinidae). It is native to lakes and rivers in Japan. Description Ginbuna is a deep- and thick-bodied fish with a terminal mouth and a large caudal fin. It possesses 5 anal fin rays, 41–57 gill rakers, and has 28–31 large lateral line scales. It reaches a maximum length of . This species is parasitized by myxozoan cnidarians of the genus ''Myxobolus'', which infest their gills. Taxonomy The ginbuna can be difficult to distinguish from the common goldfish (''Carassius auratus''), to which it is closely related. In fact, it has often been treated as a subspecies of goldfish. However, current genetic data suggests that the ginbuna is a distinct species. The ginbuna commonly hybridizes with other species in its genus where they come into contact, as well as with the closely related common carp. It ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Karst
Karst () is a topography formed from the dissolution of soluble carbonate rocks such as limestone and Dolomite (rock), dolomite. It is characterized by features like poljes above and drainage systems with sinkholes and caves underground. There is some evidence that karst may occur in more weathering-resistant rocks such as quartzite given the right conditions. Subterranean drainage may limit surface water, with few to no rivers or lakes. In regions where the dissolved bedrock is covered (perhaps by debris) or confined by one or more superimposed non-soluble rock strata, distinctive karst features may occur only at subsurface levels and can be totally missing above ground. The study of ''paleokarst'' (buried karst in the stratigraphic column) is important in petroleum geology because as much as 50% of the world's Oil and gas reserves and resource quantification, hydrocarbon reserves are hosted in carbonate rock, and much of this is found in porous karst systems. Etymology ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Landforms Of Okinawa Prefecture
A landform is a land feature on the solid surface of the Earth or other planetary body. They may be natural or may be anthropogenic (caused or influenced by human activity). Landforms together make up a given terrain, and their arrangement in the landscape is known as topography. Landforms include hills, mountains, canyons, and valleys, as well as shoreline features such as bays, peninsulas, and seas, including submerged features such as mid-ocean ridges, volcanoes, and the great oceanic basins. Physical characteristics Landforms are categorized by characteristic physical attributes such as elevation, slope, orientation, structure stratification, rock exposure, and soil type. Gross physical features or landforms include intuitive elements such as berms, cliffs, hills, mounds, peninsulas, ridges, rivers, valleys, volcanoes, and numerous other structural and size-scaled (e.g. ponds vs. lakes, hills vs. mountains) elements including various kinds of inland and oceanic waterbodi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cattle Egret
The cattle egret (formerly genus ''Bubulcus'') is a cosmopolitan distribution, cosmopolitan clade of heron (family (biology), family Ardeidae) in the genus ''Ardea (genus), Ardea'' found in the tropics, subtropics, and warm-temperate zones. According to the International Ornithologists' Union, IOC bird list, it contains two species, the western cattle egret and the eastern cattle egret, although some authorities regard them as a single species. Despite the similarities in plumage to the egrets of the genus ''Egretta'', it actually belongs to the genus ''Ardea (genus), Ardea''. Originally native to parts of Asia, Africa, and Europe, it has undergone a rapid expansion in its range (biology), distribution and successfully Colonisation (biology), colonised much of the rest of the world in the last century. They are white birds adorned with buff feather, plumes in the breeding season. They nest in bird colony, colonies, usually near bodies of water and often with other wading birds. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Common Moorhen
The common moorhen (''Gallinula chloropus''), also known as the waterhen, is a bird species in the Rail (bird), rail family (Rallidae). It is distributed across many parts of the Old World, across Africa, Europe, and Asia. It lives around well-vegetated marshes, ponds, canals and other wetlands. The species is not found in the polar regions or many tropical rainforests; generally it is one of the commonest Old World rail species, together with the Eurasian coot in some regions. Taxonomy The common moorhen was Species description, formally described in 1758 by the Swedish naturalist Carl Linnaeus in the 10th edition of Systema Naturae, tenth edition of his ''Systema Naturae''. He placed it in the genus ''Fulica (genus), Fulica'' and coined the binomial nomenclature, binomial name ''Fulica chloropus''. The common moorhen is now one of five extant species placed in the genus ''Gallinula'' that was introduced in 1760 by the French zoologist Mathurin Jacques Brisson. The genus name is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pacific Reef Heron
The Pacific reef heron (''Egretta sacra''), also known as the eastern reef heron or eastern reef egret, is a species of heron found throughout southern Asia and Oceania. It occurs in two colour morphs with either slaty grey or pure white plumage. The sexes are similar in appearance. Taxonomy The Pacific reef heron was formally described in 1789 by the German naturalist Johann Friedrich Gmelin in his revised and expanded edition of Carl Linnaeus's ''Systema Naturae''. He placed it with the herons, cranes and egrets in the genus '' Ardea'' and coined the binomial name ''Ardea sacra''. Gmelin based his description on the "Sacred heron" that had been described in 1785 by the English ornithologist John Latham in his multi-volume work ''A General Synopsis of Birds''. The naturalist Joseph Banks had provided Latham with a specimen of a white morph that had been collected on Tahiti. The Pacific reef heron is now placed with 12 other species in the genus '' Egretta'' that was introduc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mallard
The mallard () or wild duck (''Anas platyrhynchos'') is a dabbling duck that breeds throughout the temperate and subtropical Americas, Eurasia, and North Africa. It has been introduced to New Zealand, Australia, Peru, Brazil, Uruguay, Argentina, Chile, Colombia, the Falkland Islands, and South Africa. Belonging to the subfamily Anatinae of the waterfowl family Anatidae, mallards live in wetlands, eat water plants and small animals, and are social animals preferring to congregate in groups or flocks of varying sizes. Males (drakes) have green heads, while the females (hens) have mainly brown-speckled plumage. Both sexes have an area of white-bordered black or iridescent purple or blue feathers called a speculum on their wings; males especially tend to have blue speculum feathers. The mallard is long, of which the body makes up around two-thirds the length. The wingspan is and the bill is long. It is often slightly heavier than most other dabbling ducks, weighing . T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tilapia
Tilapia ( ) is the common name for nearly a hundred species of cichlid fish from the coelotilapine, coptodonine, heterotilapine, oreochromine, pelmatolapiine, and tilapiine tribes (formerly all were "Tilapiini"), with the economically most important species placed in the Coptodonini and Oreochromini. Tilapia are mainly freshwater fish native to Africa and the Middle East, inhabiting shallow streams, ponds, rivers, and lakes, and less commonly found living in brackish water. Historically, they have been of major importance in artisanal fishing in Africa, and they are of increasing importance in aquaculture and aquaponics. Tilapia can become a problematic invasive species in new warm-water habitats such as Australia, whether deliberately or accidentally introduced, but generally not in temperate climates due to their inability to survive in cold water. Traditionally a popular and affordable food in the Philippines with a mild taste, tilapia has been the fourth-most consume ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Common Carp
The common carp (''Cyprinus carpio''), also known as European carp, Eurasian carp, or simply carp, is a widespread freshwater fish of eutrophic waters in lakes and large rivers in Europe and Asia.Fishbase''Cyprinus carpio'' Linnaeus, 1758/ref>Arkive The native wild populations are considered Vulnerable species, vulnerable to extinction by the International Union for Conservation of Nature (IUCN), but the species has also been Domestication, domesticated and Introduced species, introduced (see aquaculture) into environments worldwide, and is often considered a destructive invasive species, being included in the list of the world's 100 worst invasive species. It gives its name to the carp family, Cyprinidae. Taxonomy The type subspecies is ''Cyprinus carpio carpio'', native to much of Europe (notably the Danube and Volga Rivers).Jian Feng Zhou, Qing Jiang Wu, Yu Zhen Ye & Jin Gou Tong (2003). Genetic divergence between ''Cyprinus carpio carpio'' and ''Cyprinus carpio haematopterus' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Okinawa Prefecture
is the southernmost and westernmost prefecture of Japan. It consists of three main island groups—the Okinawa Islands, the Sakishima Islands, and the Daitō Islands—spread across a maritime zone approximately 1,000 kilometers east to west and 400 kilometers north to south. Despite a modest land area of 2,281 km² (880 sq mi), Okinawa’s territorial extent over surrounding seas makes its total area nearly half the combined size of Honshu, Shikoku, and Kyushu. Of its 160 Island, islands, 49 are inhabited. The largest and most populous island is Okinawa Island, which hosts the capital city, Naha, as well as major urban centers such as Okinawa (city), Okinawa, Uruma, and Urasoe, Okinawa, Urasoe. The prefecture has a subtropical climate, characterized by warm temperatures and high rainfall throughout the year. People from the Ryukyu Islands, Nansei Islands, including Okinawa Island, Okinawa, the Sakishima Islands, and parts of Kagoshima Prefecture, are often collectively referred ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Najas Marina
''Najas marina'' is a species of aquatic plant known by the common names spiny water nymph, spiny naiad and holly-leaved naiad. It is an extremely widespread species, reported across Europe, Asia, Africa, Australia, the Americas and many oceanic islands. It can be found in many types of freshwater and brackish aquatic habitat, including bodies of alkaline water. Description ''Najas marina'' is an annual producing a slender, branching stem up to 40 or 45 centimeters in maximum length. The evenly spaced leaves are up to 4 centimeters long, 1 to 3 millimeters wide, and edged in tiny sawlike teeth. The leaf has prickles along its midvein. Minute stalkless, green flowers occur in the leaf axils. The plant is dioecious, with male and female flower types occurring on separate individuals. In the British Isles it is possible that only female plants occur. It flowers in mid-summer. Varieties and subspecies A long list of varietal and subspecific names have been proposed over the years. A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
