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Poeciliopsis Lucida
''Poeciliopsis lucida'', the clearfin livebearer, is a species of small freshwater fish in the family Poeciliidae. Reproduction is viviparous, and the female can have several clutches of young developing internally at the same time. It is one of several species of small livebearing fish endemic to Mexico that were described in 1960 by the American ichthyologist Robert Rush Miller. Description Female ''Poeciliopsis lucida'' can grow to a maximum length of about and males to . Ecology ''P. lucida'' is a livebreeder, producing live young in batches. The female can carry three batches of young at a time, each at a different stage of development, and batches are born at an average interval of 10.3 days. Maturity in the female is reached at an age of about eight weeks and a length of about . In the laboratory, brother-sister matings have been going on for many years without any sign of diminution of fecundity from inbreeding. ''P. lucida'' can hybridise with ''Poeciliopsis monacha' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Robert Rush Miller
Robert Rush Miller (April 23, 1916 – February 10, 2003) "was an important figure in American ichthyology and conservation from 1940 to the 1990s." He was born in Colorado Springs, earned his bachelor's degree at University of California, Berkeley in 1938, a master's degree at the University of Michigan in 1943, and a Ph.D. at the University of Michigan in 1944. He received tenure at the University of Michigan in 1954. Together with W. L. Minckley, he discovered a new species of platyfish, '' Xiphophorus gordoni'', that they named in honor of Dr Myron Gordon. He served as the ichthyological editor of ''Copeia'' from 1950 to 1955. Fish described * '' Chortiheros wesseli'' R. R. Miller 1996 - Cichlid * ''Cualac tessellatus'' R. R. Miller 1956 - (Checkered Pupfish) * '' Cyprinodon albivelis'' W. L. Minckley & R. R. Miller, 2002 (Whitefin pupfish) * '' Cyprinodon alvarezi'' R. R. Miller, 1976 (Potosi pupfish) * '' †Cyprinodon arcuatus'' W. L. Minckley & R. R. Miller, 2002 (Santa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parthenogenesis
Parthenogenesis (; from the Greek grc, παρθένος, translit=parthénos, lit=virgin, label=none + grc, γένεσις, translit=génesis, lit=creation, label=none) is a natural form of asexual reproduction in which growth and development of embryos occur in a gamete (egg or sperm) without combining with another gamete (e.g., egg and sperm fusing). In animals, parthenogenesis means development of an embryo from an unfertilized Gametophyte, egg cell. In plants, parthenogenesis is a component process of apomixis. In algae, parthenogenesis can mean the development of an embryo from either an individual sperm or an individual egg. Parthenogenesis occurs naturally in some plants, algae, invertebrate animal species (including nematodes, some tardigrades, water fleas, some scorpions, aphids, some mites, some bees, some Phasmatodea and parasitic wasps) and a few vertebrates (such as some fish, amphibians, reptiles and birds). This type of reproduction has been induced artificially ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Endemic Fish Of Mexico
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] |
Substrate (biology)
In biology, a substrate is the surface on which an organism (such as a plant, fungus, or animal) lives. A substrate can include biotic or abiotic materials and animals. For example, encrusting algae that lives on a rock (its substrate) can be itself a substrate for an animal that lives on top of the algae. Inert substrates are used as growing support materials in the hydroponic cultivation of plants. In biology substrates are often activated by the nanoscopic process of substrate presentation. In agriculture and horticulture * Cellulose substrate * Expanded clay aggregate (LECA) * Rock wool * Potting soil * Soil In animal biotechnology Requirements for animal cell and tissue culture Requirements for animal cell and tissue culture are the same as described for plant cell, tissue and organ culture (In Vitro Culture Techniques: The Biotechnological Principles). Desirable requirements are (i) air conditioning of a room, (ii) hot room with temperature recorder, (iii) microscope r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Juvenile Fish
Fish go through various life stages between fertilization and adulthood. The life of a fish start as spawned eggs which hatch into immotile larvae. These larval hatchlings are not yet capable of feeding themselves and carry a yolk sac which provides stored nutrition. Before the yolk sac completely disappears, the young fish must mature enough to be able to forage independently. When they have developed to the point where they are capable of feeding by themselves, the fish are called fry. When, in addition, they have developed scales and working fins, the transition to a juvenile fish is complete and it is called a fingerling, so called as they are typically about the size of human fingers. The juvenile stage lasts until the fish is fully grown, sexually mature and interacting with other adult fish. Growth stages Ichthyoplankton ''(planktonic or drifting fish)'' are the eggs and larvae of fish. They are usually found in the sunlit zone of the water column, less than 200 met ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cannibalism (zoology)
Cannibalism is the act of consuming another individual of the same species as food. Cannibalism is a common ecological interaction in the animal kingdom and has been recorded in more than 1,500 species. Human cannibalism is well documented, both in ancient and in recent times. The rate of cannibalism increases in nutritionally poor environments as individuals turn to members of their own species as an additional food source.Elgar, M.A. & Crespi, B.J. (1992) ''Cannibalism: ecology and evolution among diverse taxa'', Oxford University Press, Oxford ngland New York. Cannibalism regulates population numbers, whereby resources such as food, shelter and territory become more readily available with the decrease of potential competition. Although it may benefit the individual, it has been shown that the presence of cannibalism decreases the expected survival rate of the whole population and increases the risk of consuming a relative. Other negative effects may include the increased ri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mocorito River
Mocorito (meaning "place of the dead") is a small city and its surrounding municipality in the Mexican state of Sinaloa. The city reported 5,426 inhabitants in the 2010 census. History In 1531, with the entry of the conquistador Nuño de Guzmán to northwest Mexico and the founding of the town of San Miguel de Navito, the geographical boundaries of the province of Culiacan were set, subject to the governorship of Nueva Galicia. In 1532, Sebastián de Évora reached the Mocorito valley and called his name, the people and the river, leaving as encomendero dependent as mayor of the province of Culiacan, from that year was defined between the river towards Évora North and Elota River in the south. In 1594 the Mission Mocorito was founded by the Jesuits Juan Bautista Hernando de Velasco and Santarán. In 1732 when the Spanish arrived expansion beyond the Yaqui River, lays the territory divided into provinces. In this year rank first Sonora and Sinaloa to form a single governors ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sinaloa River
The Sinaloa River is a river of Mexico. It runs across the state of Sinaloa from northeast to southwest, beginning in the Sierra Madre Occidental and emptying into the Gulf of California. Its flow is interrupted mostly by the Bacurato Dam which created Lake Baccarac in 1978. Below the dam, the flow of the river is largely diverted by an irrigation canal near the town of Sinaloa de Leyva. See also *List of longest rivers of Mexico *List of rivers of Mexico This is a list of rivers of Mexico, listed from north to south. There are 246 rivers on this list. Alternate names for rivers are given in parentheses. Rivers flowing into the Gulf of Mexico *Río Bravo, the name of the Rio Grande in Mexico ** Sa ... References 1975 Atlas of Mexico — River basins of Mexico*The Prentice Hall American World Atlas, 1984. *Rand McNally, The New International Atlas, 1993. Rivers of Sinaloa Rivers of the Gulf of California Rivers of the Sierra Madre Occidental Rivers of Mexico {{Mexi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fuerte River
The Fuerte River is a river in the state of Sinaloa, in northwestern Mexico. It flows from headwaters in the Sierra Madre Occidental to the Pacific Ocean in the Gulf of California. Course It begins at the junction of the Rio Verde (also called the Rio San Miguel) and Urique River, in the Sierra Madre Occidental mountain range. It flows generally southwest for a distance of , with its river mouth on the Gulf of California at Lechuguilla Island, west of the city of Los Mochis. Miguel Hidalgo Dam impounds the river near the town of El Fuerte creating the state's largest reservoir, Embalse de Gustavo Diaz Ordaz.http://www.eosnap.com/?tag=fuerte-river Earth Snapshot website, accessed 17 September 2009 The water is used extensively for agricultural irrigation in northern Sinaloa and southern Sonora states. Features The river is surrounded by large mango plantations which produce the fruits mainly for export to the United States. The former capitol of Sinaloa, Sinaloa de Leyva, is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Poeciliopsis
''Poeciliopsis'' is a genus of poeciliid fishes that primarily are native to Mexico and Central America. The only exceptions are ''P. turrubarensis'' where the range extends into Colombia, and ''P. occidentalis'' where the range extends into Arizona and New Mexico. Species There are currently 24 recognized species in this genus: * ''Poeciliopsis baenschi'' ( M. K. Meyer, Radda, Riehl & Feichtinger, 1986) (Golden livebearer) * ''Poeciliopsis balsas'' ( C. L. Hubbs, 1926) (Balsas livebearer) * ''Poeciliopsis catemaco'' (R. R. Miller, 1975) (Catemaco livebearer) * ''Poeciliopsis elongata'' ( Günther, 1866) (Elongate toothcarp) * '' Poeciliopsis fasciata'' (Meek, 1904) (San Jeronimo livebearer) * '' Poeciliopsis gracilis'' ( Heckel, 1848) (Porthole livebearer) * '' Poeciliopsis hnilickai'' ( M. K. Meyer & Vogel, 1981) (Upper Grijalva livebearer) * '' Poeciliopsis infans'' ( Woolman, 1894) (Lerma livebearer) * '' Poeciliopsis latidens'' (Garman, 1895) (Lowland livebearer) * ''Poec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gynogenesis
Gynogenesis, a form of parthenogenesis, is a system of asexual reproduction that requires the presence of sperm without the actual contribution of its DNA for completion. The paternal DNA dissolves or is destroyed before it can fuse with the egg. The egg cell of the organism is able to develop, unfertilized, into an adult using only maternal genetic material. Gynogenesis is often termed "sperm parasitism" in reference to the somewhat pointless role of male gametes. Gynogenetic species, "gynogens" for short, are unisexual, meaning they must mate with males from a closely related bisexual species that normally reproduces sexually. Gynogenesis is a disadvantageous mating system for males, as they are unable to pass on their DNA. The question as to why this reproductive mode exists, given that it appears to combine the disadvantages of both asexual and sexual reproduction, remains unsolved in the field of evolutionary biology. The male equivalent to this process is Androgenesis where th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polyploid
Polyploidy is a condition in which the cells of an organism have more than one pair of ( homologous) chromosomes. Most species whose cells have nuclei ( eukaryotes) are diploid, meaning they have two sets of chromosomes, where each set contains one or more chromosomes and comes from each of two parents, resulting in pairs of homologous chromosomes between sets. However, some organisms are polyploid. Polyploidy is especially common in plants. Most eukaryotes have diploid somatic cells, but produce haploid gametes (eggs and sperm) by meiosis. A monoploid has only one set of chromosomes, and the term is usually only applied to cells or organisms that are normally diploid. Males of bees and other Hymenoptera, for example, are monoploid. Unlike animals, plants and multicellular algae have life cycles with two alternating multicellular generations. The gametophyte generation is haploid, and produces gametes by mitosis, the sporophyte generation is diploid and produces spores by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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