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Lake Mboandong
Lake Barombi Koto, also known as Lake Barombi Kotto or Lake Barombi-ba-Kotto, is a small lake in the volcanic chain in the Southwest Region of Cameroon. It is a volcanic lake with a diameter of about . There is a small island in the middle, which is densely inhabited by the Barombi, a tribe of fishers. The Tung Nsuia and Tung Nsuria streams, each about wide and deep near their mouth, are the only inflows into the lake, and they dry out in dry season. Biology Lake Barombi Koto often appears green-brown because it is rich in phytoplankton. Invertebrates, turtles and the aquatic frog ''Xenopus tropicalis'' are common in the lake, which is also an important sanctuary for birds. Seven fish species are known from the lake, including '' Enteromius callipterus'' and a ''Clarias'' catfish, while the remaining all are cichlids: '' Coptodon kottae'', '' Chromidotilapia guentheri'', ''Hemichromis fasciatus'', '' Pelmatolapia mariae'' and ''Sarotherodon galilaeus''. Of these, ''C. guenthe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanic Crater Lake
A volcanic crater lake is a lake in a crater that was formed by explosive activity or a collapse during a volcanic eruption. Formation Lakes in calderas fill large craters formed by the collapse of a volcano during an eruption. Lakes in maars fill medium-sized craters where an eruption deposited debris around a vent. Crater lakes form as the created depression, within the crater rim, is filled by water. The water may come from precipitation, groundwater circulation (often hydrothermal fluids in the case of volcanic craters) or melted ice. Its level rises until an equilibrium is reached between the rates of incoming and outgoing water. Sources of water loss singly or together may include evaporation, subsurface seepage, and, in places, surface leakage or overflow when the lake level reaches the lowest point on its rim. At such a saddle location, the upper portion of the lake is contained only by its adjacent natural volcanic dam; continued leakage through or surface outflow ac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Undescribed Species
In taxonomy, an undescribed taxon is a taxon (for example, a species) that has been discovered, but not yet formally described and named. The various Nomenclature Codes specify the requirements for a new taxon to be validly described and named. Until such a description has been published, the taxon has no formal or official name, although a temporary, informal name is often used. A published scientific name may not fulfil the requirements of the Codes for various reasons. For example, if the taxon was not adequately described, its name is called a '' nomen nudum''. It is possible for a taxon to be "undescribed" for an extensive period of time, even if unofficial descriptions are published. An undescribed species may be referred to with the genus name, followed by "sp"., but this abbreviation is also used to label specimens or images that are too incomplete to be identified at the species level. In some cases, there is more than one undescribed species in a genus. In this case, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bulinus
''Bulinus'' is a genus of small tropical freshwater snails, aquatic gastropod mollusks in the family Bulinidae, the ramshorn snails and their allies. MolluscaBase eds. (2020). MolluscaBase. Bulinus O. F. Müller, 1781. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=224352 on 2020-06-27 This genus is medically important because several species of ''Bulinus'' function as intermediate hosts for the schistosomiasis blood fluke. Taxonomy Miocene genus ''Kosovia'' was synonymized ''Bulinus'' in 2017. Distribution These snails are widespread in Africa including Madagascar and the Middle East. This genus has not yet become established in the USA, but it is considered to represent a potentially serious threat as a pest, an invasive species which could negatively affect agriculture, natural ecosystems, human health or commerce. Therefore it has been suggested that this species be given top national quarantine signifi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Procatopus Similis
''Procatopus'' is a genus of poeciliid fishes native to tropical freshwater habitats in Cameroon and Nigeria. Species There are currently three recognized species in this genus: * ''Procatopus aberrans'' C. G. E. Ahl, 1927 (Bluegreen lampeye) * ''Procatopus nototaenia ''Procatopus'' is a genus of poeciliid fishes native to tropical freshwater habitats in Cameroon and Nigeria. Species There are currently three recognized species in this genus: * ''Procatopus aberrans ''Procatopus'' is a genus of poeciliid f ...'' Boulenger, 1904 (Large finned lampeye) * '' Procatopus similis'' C. G. E. Ahl, 1927 (Variable lampeye) References Poeciliidae Freshwater fish of Africa Freshwater fish genera Taxa named by George Albert Boulenger Ray-finned fish genera {{Cyprinodontiformes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Poeciliidae
The Poeciliidae are a family of freshwater fishes of the order Cyprinodontiformes, the tooth-carps, and include well-known live-bearing aquarium fish, such as the guppy, molly, platy, and swordtail. The original distribution of the family was the Southeastern United States to north of Río de la Plata, Argentina, and Africa, including Madagascar. Due to release of aquarium specimens and the widespread use of species of the genera ''Poecilia'' and ''Gambusia'' for mosquito control, though, poeciliids can today be found in all tropical and subtropical areas of the world. In addition, ''Poecilia'' and ''Gambusia'' specimens have been identified in hot springs pools as far north as Banff, Alberta. Live-bearing Although the whole family Poeciliidae is known as "live bearers" (viviparous), some species are egg-scattering with external fertilization. All African species are egg-layers, and (with the exception of the members of the genus ''Tomeurus''), all American species are live ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fundulopanchax Oeseri
''Fundulopanchax'' is a genus of killifish living in near-coastal fresh water streams and lakes in Western Africa. All species were previously biologically classified as members of the genus ''Aphyosemion'', with the exception of ''Fundulopanchax avichang'', ''F. gresensi'' and ''F. kamdemi'', which were all scientifically described after the major revision of the ''Aphyosemion'' complex. Etymology The name ''Fundulopanchax'' is composed of the names of two other genera of killifish, ''Fundulus'' Lacépède (1803), which was the genus the type species was originally placed in and '' Panchax'' Valenciennes (1846), as this genus is somewhat intermediate between ''Fundulus'' and ''Aplocheilus'' in characters. Species There are currently 26 recognized species in this genus: * ''Fundulopanchax amieti'' ( Radda, 1976) (Amiet's lyretail) * ''Fundulopanchax arnoldi'' (Boulenger, 1908) (Arnold's killi) * ''Fundulopanchax avichang'' Malumbres & Castelo, 2001 * ''Fundulopanchax cinn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epiplatys Sexfasciatus
''Epiplatys sexfasciatus'' or six-barred panchax is a species of fish in the family Aplocheilidae that can be found in West and Central Africa. The fish is a timid surface dwelling predator. The six-barred panchax is up to long and closely resembles '' Epiplatys longiventralis''. This is the type species of the genus ''Epiplatys ''Epiplatys'' is a genus of African rivuline in the family (biology), family Nothobranchiidae endemism, endemic to Africa as the name indicates. Several of these species are popular aquarium fish. Species These are the currently recognized speci ...'' and was described by Theodore N. Gill in 1862 with the type locality given as Gabon. Sub-species There are three recognized sub-species: * '' Epiplatys sexfasciatus rathkei'' Radda, 1970 * '' Epiplatys sexfasciatus sexfasciatus'' T. N. Gill, 1862 * '' Epiplatys sexfasciatus togolensis'' Loiselle, 1971 References sexfasciatus Cyprinodontiformes Taxa named by Theodore Gill Fish described in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aphyosemion Bivittatum
''Aphyosemion bivittatum'' (twostripe lyretail, two-banded killi, red lyretail) is a species of freshwater fish belonging to the family Aplocheilidae. It is found in rivers in southeastern Nigeria and southwestern Cameroon. It was originally described as ''Fundulus bivittatus'' by Swedish zoologist Einar Lönnberg in 1895. The holotype was discovered near a waterfall in the Ndian River in Cameroon and currently is located in the Stockholm Museum. Appearance ''A. bivittatum'' has an elongated, brightly coloured body with two dark bands made up of red spots running along each side, with the colors varying between populations. Individual males are commonly found with golden-brown dorsal surfaces, bluish sides, and golden ventral surfaces. The males have a maximum body length of approximately and have brightly marked, tall and pointed anal and dorsal fins that are yellow to pastel green with red edges. The caudal and dorsal fins are green with red spots and bright yellow tips. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nothobranchiidae
Nothobranchiidae are a family of bony fishes containing roughly 300 species, also known as African rivulines. They are small killifish, usually measuring about . They are limited to Africa, living in fresh water but being also somewhat salt-tolerant. They are also found in muddy or brackish water. Some species are kept as aquarium pets. They have frilly fins and many are brightly colored. They were formerly included in the family Aplocheilidae (which was later limited to Malagasy, Seychellean and Asian species); a return to that broader family has recently been suggested.Costa, W.J.E.M. (2016)Comparative morphology and classification of South American cynopoeciline killifishes (Cyprinodontiformes: Aplocheilidae), with notes on family-group names used for aplocheiloids.''Vertebrate Zoology, 66 (2): 125-140.'' Members of genus '' Nothobranchius'' are found in mud pools on the plains of Africa, a habitat shared by no other fish except the lungfishes. Their life cycle is only a y ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Nyos
Lake Nyos ( ) is a crater lake in the Region of Cameroon, located about northwest of Yaoundé, the capital. Nyos is a deep lake high on the flank of an inactive volcano in the Oku volcanic plain along the Cameroon line of volcanic activity. A volcanic dam impounds the lake waters. A pocket of magma lies beneath the lake and leaks carbon dioxide () into the water, changing it into carbonic acid. Nyos is one of only three lakes known to be saturated with carbon dioxide in this way, and therefore prone to limnic eruptions (the others being Lake Monoun, also in Cameroon, and Lake Kivu in the Democratic Republic of Congo and Rwanda). In 1986, possibly as the result of a landslide, Lake Nyos suddenly emitted a large cloud of , which suffocated 1,746 people and 3,500 livestock in nearby towns and villages, the most notable one being Chah, which was abandoned after the incident. Though not completely unprecedented, it was the first known large-scale asphyxiation caused b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carbon Dioxide
Carbon dioxide (chemical formula ) is a chemical compound made up of molecules that each have one carbon atom covalently double bonded to two oxygen atoms. It is found in the gas state at room temperature. In the air, carbon dioxide is transparent to visible light but absorbs infrared radiation, acting as a greenhouse gas. It is a trace gas in Earth's atmosphere at 421 parts per million (ppm), or about 0.04% by volume (as of May 2022), having risen from pre-industrial levels of 280 ppm. Burning fossil fuels is the primary cause of these increased CO2 concentrations and also the primary cause of climate change.IPCC (2022Summary for policy makersiClimate Change 2022: Mitigation of Climate Change. Contribution of Working Group III to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA Carbon dioxide is soluble in water and is found in groundwater, lakes, ice caps, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Stratification
Lake stratification is the tendency of lakes to form separate and distinct thermal layers during warm weather. Typically stratified lakes show three distinct layers, the Epilimnion comprising the top warm layer, the thermocline (or Metalimnion): the middle layer, which may change depth throughout the day, and the colder Hypolimnion extending to the floor of the lake. Definition The thermal stratification of lakes refers to a change in the temperature at different depths in the lake, and is due to the density of water varying with temperature. Cold water is denser than warm water and the epilimnion generally consists of water that is not as dense as the water in the hypolimnion. However, the temperature of maximum density for freshwater is 4 °C. In Temperate climate, temperate regions where lake water warms up and cools through the seasons, a cyclical pattern of overturn occurs that is repeated from year to year as the cold dense water at the top of the lake sinks (see stab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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