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Nanhaipotamon Hongkongense
''Nanhaipotamon hongkongense'' is a species of freshwater crab of the genus ''Nanhaipotamon'', known to occur in Hong Kong ( Hong Kong Island, New Territories, Lantau Island and a few smaller islands) and adjacent areas in Shenzhen and Dongguan, Mainland China. Description and life history ''Nanhaipotamon hongkongense'' is a burrowing species that digs burrows into muddy banks of small rivers and creeks or moist soil. It is a nocturnal species that mostly stays in its burrow during the day and comes out at night or after heavy rainfalls. Offspring hatch as miniature versions of adult crabs after direct development, like with all potamid crabs. Distribution and habitat This species is semiterrestrial and inhabits the banks of hillstreams, but can also be found in places far away from running water, such as moist areas were groundwater seeps through the soil, generally in secondary evergreen broadleaf forests. Whereas adults are rarely reported from actual aquatic habitats, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Freshwater Crab
Around 1,300 species of freshwater crabs are distributed throughout the tropics and subtropics, divided among eight families. They show direct development and maternal care of a small number of offspring, in contrast to marine crabs, which release thousands of planktonic larvae. This limits the dispersal abilities of freshwater crabs, so they tend to be endemic to small areas. As a result, a large proportion are threatened with extinction. Systematics More than 1,300 described species of freshwater crabs are known, out of a total of 6,700 species of crabs across all environments. The total number of species of freshwater crabs, including undescribed species, is thought to be up to 65% higher, potentially up to 2,155 species, although most of the additional species are currently unknown to science. They belong to eight families, each with a limited distribution, although various crabs from other families are also able to tolerate freshwater conditions ( euryhaline) or are secon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tropical And Subtropical Moist Broadleaf Forests
Tropical and subtropical moist broadleaf forests (TSMF), also known as tropical moist forest, is a subtropical and tropical forest habitat type defined by the World Wide Fund for Nature. Description TSMF is generally found in large, discontinuous patches centered on the equatorial belt and between the Tropic of Cancer and Tropic of Capricorn, TSMF are characterized by low variability in annual temperature and high levels of rainfall of more than annually. Forest composition is dominated by evergreen and semi-deciduous tree species. These trees number in the thousands and contribute to the highest levels of species diversity in any terrestrial major habitat type. In general, biodiversity is highest in the forest canopy. The canopy can be divided into five layers: overstory canopy with emergent crowns, a medium layer of canopy, lower canopy, shrub level, and finally understory. These forests are home to more species than any other terrestrial ecosystem: Half of the world's sp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Freshwater Crustaceans Of Asia
Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. Although the term specifically excludes seawater and brackish water, it does include non- salty mineral-rich waters such as chalybeate springs. Fresh water may encompass frozen and meltwater in ice sheets, ice caps, glaciers, snowfields and icebergs, natural precipitations such as rainfall, snowfall, hail/ sleet and graupel, and surface runoffs that form inland bodies of water such as wetlands, ponds, lakes, rivers, streams, as well as groundwater contained in aquifers, subterranean rivers and lakes. Fresh water is the water resource that is of the most and immediate use to humans. Water is critical to the survival of all living organisms. Many organisms can thrive on salt water, but the great majority of higher plants and most insects, amphibians, reptiles, mammals and birds need fresh water to survive. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Potamoidea
Potamoidea is a superfamily of freshwater crabs, comprising the two families Potamidae Potamidae is a family (biology), family of freshwater crabs. It includes more than 650 species and nearly 100 genera, which are placed into two subfamilies: Potaminae and Potamiscinae. Subfamily Potaminae The Potaminae Ortmann, 1896 are distrib ... and Potamonautidae. Two previously recognised families, Deckeniidae and Platythelphusidae, are now treated as parts of the family Potamonautidae. References Crabs Arthropod superfamilies {{crab-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Species First Discovered In Hong Kong
This list contains species first discovered in Hong Kong, with the endemic species asterisked. Plants *Bauhinia (''Bauhinia blakeana'') * Crapnell's camellia (''Camellia crapnelliana'') *Grantham's camellia (''Camellia granthamiana'') *Hong Kong camellia (''Camellia hongkongensis'') * Hong Kong dogwood (''Dendrobenthamia hongkongensis'') * Hong Kong iris (''Iris speculatrix'') * Hong Kong balsam (''Impatiens hongkongensis'') *Pavetta (''Pavetta hongkongensis'') *Hong Kong croton (''Croton hancei'')* *Hong Kong wild kumquat (''Fortunella hindsii''), see Kumquat * Hong Kong bamboo (''Arundinaria shiuyingiana'')* * Lantau star-anise (''Illicium angustisepalum'')* * Hong Kong asarum (''Asarum hongkongense'')* * Shiuying bamboo (''Arundinaria shiuyingiana'')* * Subglabrous cane (''Sasa subglabra'')* * Two-coloured bulbophyllum (''Bulbophyllum bicolor'')* * Monteiro's caterpillar orchid (''Cheirostylis monteiroi'')* * Entire lip ginger (''Zingiber integrilabrum'')* (probably extinct) Anim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Habitat Fragmentation
Habitat fragmentation describes the emergence of discontinuities (fragmentation) in an organism's preferred environment (habitat), causing population fragmentation and ecosystem decay. Causes of habitat fragmentation include geological processes that slowly alter the layout of the physical environment (suspected of being one of the major causes of speciation), and human activity such as land conversion, which can alter the environment much faster and causes the extinction of many species. More specifically, habitat fragmentation is a process by which large and contiguous habitats get divided into smaller, isolated patches of habitats. Definition The term habitat fragmentation includes five discrete phenomena: * Reduction in the total area of the habitat * Decrease of the interior: edge ratio * Isolation of one habitat fragment from other areas of habitat * Breaking up of one patch of habitat into several smaller patches * Decrease in the average size of each patch of habitat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Union For Conservation Of Nature
The International Union for Conservation of Nature (IUCN; officially International Union for Conservation of Nature and Natural Resources) is an international organization working in the field of nature conservation and sustainable use of natural resources. It is involved in data gathering and analysis, research, field projects, advocacy, and education. IUCN's mission is to "influence, encourage and assist societies throughout the world to conserve nature and to ensure that any use of natural resources is equitable and ecologically sustainable". Over the past decades, IUCN has widened its focus beyond conservation ecology and now incorporates issues related to sustainable development in its projects. IUCN does not itself aim to mobilize the public in support of nature conservation. It tries to influence the actions of governments, business and other stakeholders by providing information and advice and through building partnerships. The organization is best known to the wider pu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Least-concern Species
A least-concern species is a species that has been categorized by the International Union for Conservation of Nature (IUCN) as evaluated as not being a focus of species conservation because the specific species is still plentiful in the wild. They do not qualify as threatened, near threatened, or (before 2001) conservation dependent. Species cannot be assigned the "Least Concern" category unless they have had their population status evaluated. That is, adequate information is needed to make a direct, or indirect, assessment of its risk of extinction based on its distribution or population status. Evaluation Since 2001 the category has had the abbreviation "LC", following the IUCN 2001 Categories & Criteria (version 3.1). Before 2001 "least concern" was a subcategory of the "Lower Risk" category and assigned the code "LR/lc" or lc. Around 20% of least concern taxa (3261 of 15636) in the IUCN database still use the code "LR/lc", which indicates they have not been re-evaluate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Endemism
Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsewhere. For example, the Cape sugarbird is found exclusively in southwestern South Africa and is therefore said to be ''endemic'' to that particular part of the world. An endemic species can be also be referred to as an ''endemism'' or in scientific literature as an ''endemite''. For example '' Cytisus aeolicus'' is an endemite of the Italian flora. '' Adzharia renschi'' was once believed to be an endemite of the Caucasus, but it was later discovered to be a non-indigenous species from South America belonging to a different genus. The extreme opposite of an endemic species is one with a cosmopolitan distribution, having a global or widespread range. A rare alternative term for a species that is endemic is "precinctive", which applies to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Potamidae
Potamidae is a family (biology), family of freshwater crabs. It includes more than 650 species and nearly 100 genera, which are placed into two subfamilies: Potaminae and Potamiscinae. Subfamily Potaminae The Potaminae Ortmann, 1896 are distributed around the Mediterranean Sea, on Socotra and eastwards to Northern India. *''Acanthopotamon'' Kemp, 1918 *''Alcomon'' Yeo & Ng, 2007 *''Himalayapotamon'' Pretzmann, 1966 *''Lobothelphusa'' Bouvier, 1917 *''Paratelphusula'' Alcock, 1909 *''Potamon'' Savigny, 1816 *''Socotra pseudocardisoma, Socotra'' Cumberlidge & Wranik, 2002 *''Socotrapotamon'' Apel & Brandis, 2000 Subfamily Potamiscinae The Potamiscinae Bott, 1970 are found in East Asia and Southeast Asia. *''Acartiapotamon'' Dai, 1999 *''Allopotamon'' Ng, 1988 *''Amamiku'' Naruse, Segawa & Shokita, 2004 *''Aparapotamon'' Dai & G. X. Chen, 1985 *''Apotamonautes'' Dai & Xing, 1993 *''Artopotamon'' Dai & G. X. Chen, 1985 *''Arquatopotamon'' Chu, Zhou & Sun, 2017 *''Aspermon'' Yeo & N ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nanhaipotamon
''Nanhaipotamon'' is a genus of freshwater crabs, in the subfamily Potamiscinae, found in southern China and Taiwan. As of 2018, 18 species have been described. The genus is named after the South China Sea (; literally: 'South Sea'), for it occurs mostly in coastal areas. Description These crabs are relatively large, with a carapace breadth of up to . Depending on the species, the carapace may be vividly coloured, especially in males of '' N. hongkongense'' (orange to red),'''' '' N. aculatum'' (dark blue) and '' N. zhuhaiense'' (light blue). Chelipeds are usually unequal, more so in larger males, where one cheliped is relatively much larger than the other. This may be of use in territorial fights, as the crabs are very aggressive towards conspecifics.'''' Distribution and habitat Crabs of the genus ''Nanhaipotamon'' inhabit the banks of small to medium-sized hill streams, paddy fields and swamps. Although not particularly a lowland species, they usually do not occur abov ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
China
China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and borders fourteen countries by land, the most of any country in the world, tied with Russia. Covering an area of approximately , it is the world's third largest country by total land area. The country consists of 22 provinces, five autonomous regions, four municipalities, and two Special Administrative Regions (Hong Kong and Macau). The national capital is Beijing, and the most populous city and financial center is Shanghai. Modern Chinese trace their origins to a cradle of civilization in the fertile basin of the Yellow River in the North China Plain. The semi-legendary Xia dynasty in the 21st century BCE and the well-attested Shang and Zhou dynasties developed a bureaucratic political system to serve hereditary monarchies, or dyna ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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