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Julimes Pupfish (Cyprinodon Julimes) Male
The Julimes pupfish (''Cyprinodon julimes'') ( es, Cachorrito de Julimes) is a species of killifish in the family Cyprinodontidae. This pupfish is endemic to El Pandeño, a hot spring in Julimes, Chihuahua, Mexico, and it is adapted to life in water that reaches temperatures as high as . Consequently, it has been referred to as the "hottest fish in the world", although the closely related ''Cyprinodon pachycephalus'' can occur in somewhat warmer waters. ''Cyprinodon julimes'' was scientifically described in 2009 as similar to ''Cyprinodon eximius'', but it has a bigger head, nearly one-third of its standard length. Appearance Its body is deep, the dorsal and ventral profile is convex and the lower jaw exceeds the premaxilla. The dorsal fin is placed forward with respect to the pelvic fin.De la Maza-Benignos, M. and L. Vela-Valladares. 2009. “Cyprinodon julimes sp. nov”. Los Peces del Río Conchos (editor: De la Maza-Benignos, M.). Alianza WWF - FGRA y Gobierno del Estado de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mauricio De La Maza-Benignos
Mauricio de la Maza-Benignos (July 27, 1970 –) is a Mexican conservationist, naturalist and zoologist. He is also a member of Mexico's National System of Researchers. In addition to his work in ichthyology, he is an agronomist and zootechnician, a jurist, an administrator, and an editor. Education He earned his bachelor's degree at the Monterrey Institute of Technology and Higher Education, a Master of Business Administration at The University of Lancaster, a Ph.D. summa cum laude, at the Autonomous University of Nuevo León, and studied Law, under a merit scholarship at the TecMilenio University. In 1994 he obtained the “Best students of Mexico Award” by the “National Permanent Committee for the Best Students of Mexico”, and in 2014 he was awarded first place in the “Dr. José Álvarez Del Villar” prize for his doctoral thesis, by the Mexican Ichthyology Society. He developed his doctoral thesis under the direction of Professor and Ichthyologist Ma. de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Julimes Pupfish (Cyprinodon Julimes) Male
The Julimes pupfish (''Cyprinodon julimes'') ( es, Cachorrito de Julimes) is a species of killifish in the family Cyprinodontidae. This pupfish is endemic to El Pandeño, a hot spring in Julimes, Chihuahua, Mexico, and it is adapted to life in water that reaches temperatures as high as . Consequently, it has been referred to as the "hottest fish in the world", although the closely related ''Cyprinodon pachycephalus'' can occur in somewhat warmer waters. ''Cyprinodon julimes'' was scientifically described in 2009 as similar to ''Cyprinodon eximius'', but it has a bigger head, nearly one-third of its standard length. Appearance Its body is deep, the dorsal and ventral profile is convex and the lower jaw exceeds the premaxilla. The dorsal fin is placed forward with respect to the pelvic fin.De la Maza-Benignos, M. and L. Vela-Valladares. 2009. “Cyprinodon julimes sp. nov”. Los Peces del Río Conchos (editor: De la Maza-Benignos, M.). Alianza WWF - FGRA y Gobierno del Estado de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pronatura Noreste
Pronatura Noreste is a Mexican nongovernmental, nonprofit organization recognized by the National Council of Science and Technology as a scientific and educational organization. Pronatura Noreste is one of six regional offices of the Pronatura México, and has its headquarters in Monterrey, Nuevo León. It also has offices in Matamoros, Tamaulipas; Cuatro Ciénegas, Coahuila; San Rafael, Nuevo León; Janos, Chihuahua; and Ciudad Victoria, Tamaulipas. The organization was created in 1998 by an executive board of trustees committed to nature conservation. Its mission is the conservation of flora, fauna and priority ecosystems of northeastern Mexico by promoting society's development in harmony with nature. Conservation approach Pronatura Noreste's projects are based on an ecoregional focus, expanding over the territorial limits determined by states and countries, with special attention on priority sites and the most fragile habitats, species and biodiversity. Its four ecoregional ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heterozygosity
Zygosity (the noun, zygote, is from the Greek "yoked," from "yoke") () is the degree to which both copies of a chromosome or gene have the same genetic sequence. In other words, it is the degree of similarity of the alleles in an organism. Most eukaryotes have two matching sets of chromosomes; that is, they are diploid. Diploid organisms have the same loci on each of their two sets of homologous chromosomes except that the sequences at these loci may differ between the two chromosomes in a matching pair and that a few chromosomes may be mismatched as part of a chromosomal sex-determination system. If both alleles of a diploid organism are the same, the organism is homozygous at that locus. If they are different, the organism is heterozygous at that locus. If one allele is missing, it is hemizygous, and, if both alleles are missing, it is nullizygous. The DNA sequence of a gene often varies from one individual to another. These gene variants are called alleles. While some gen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Locus (genetics)
In genetics, a locus (plural loci) is a specific, fixed position on a chromosome where a particular gene or genetic marker is located. Each chromosome carries many genes, with each gene occupying a different position or locus; in humans, the total number of protein-coding genes in a complete haploid set of 23 chromosomes is estimated at 19,000–20,000. Genes may possess multiple variants known as alleles, and an allele may also be said to reside at a particular locus. Diploid and polyploid cells whose chromosomes have the same allele at a given locus are called homozygous with respect to that locus, while those that have different alleles at a given locus are called heterozygous. The ordered list of loci known for a particular genome is called a gene map. Gene mapping is the process of determining the specific locus or loci responsible for producing a particular phenotype or biological trait. Association mapping, also known as "linkage disequilibrium mapping", is a method of ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alleles
An allele (, ; ; modern formation from Greek ἄλλος ''állos'', "other") is a variation of the same sequence of nucleotides at the same place on a long DNA molecule, as described in leading textbooks on genetics and evolution. ::"The chromosomal or genomic location of a gene or any other genetic element is called a locus (plural: loci) and alternative DNA sequences at a locus are called alleles." The simplest alleles are single nucleotide polymorphisms (SNP). but they can also be insertions and deletions of up to several thousand base pairs. Popular definitions of 'allele' typically refer only to different alleles within genes. For example, the ABO blood grouping is controlled by the ABO gene, which has six common alleles (variants). In population genetics, nearly every living human's phenotype for the ABO gene is some combination of just these six alleles. Most alleles observed result in little or no change in the function of the gene product it codes for. However, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microsatellite
A microsatellite is a tract of repetitive DNA in which certain DNA motifs (ranging in length from one to six or more base pairs) are repeated, typically 5–50 times. Microsatellites occur at thousands of locations within an organism's genome. They have a higher mutation rate than other areas of DNA leading to high genetic diversity. Microsatellites are often referred to as short tandem repeats (STRs) by forensic geneticists and in genetic genealogy, or as simple sequence repeats (SSRs) by plant geneticists. Microsatellites and their longer cousins, the minisatellites, together are classified as VNTR (variable number of tandem repeats) DNA. The name "satellite" DNA refers to the early observation that centrifugation of genomic DNA in a test tube separates a prominent layer of bulk DNA from accompanying "satellite" layers of repetitive DNA. They are widely used for DNA profiling in cancer diagnosis, in kinship analysis (especially paternity testing) and in forensic identific ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inbreeding Depression
Inbreeding depression is the reduced biological fitness which has the potential to result from inbreeding (the breeding of related individuals). Biological fitness refers to an organism's ability to survive and perpetuate its genetic material. Inbreeding depression is often the result of a population bottleneck. In general, the higher the genetic variation or gene pool within a breeding population, the less likely it is to suffer from inbreeding depression, though inbreeding and outbreeding depression can simultaneously occur. Inbreeding depression seems to be present in most groups of organisms, but varies across mating systems. Hermaphroditic species often exhibit lower degrees of inbreeding depression than outcrossing species, as repeated generations of selfing is thought to purge deleterious alleles from populations. For example, the outcrossing nematode (roundworm) ''Caenorhabditis remanei'' has been demonstrated to suffer severely from inbreeding depression, unlike its he ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Effective Population Size
The effective population size (''N''''e'') is a number that, in some simplified scenarios, corresponds to the number of breeding individuals in the population. More generally, ''N''''e'' is the number of individuals that an idealised population would need to have in order for some specified quantity of interest (typically change of genetic diversity or inbreeding rates) to be the same as in the real population. Idealised populations are based on unrealistic but convenient simplifications such as random mating, simultaneous birth of each new generation, constant population size, and equal numbers of children per parent. For most quantities of interest and most real populations, the effective population size ''N''''e'' is usually smaller than the census population size ''N'' of a real population. The same population may have multiple effective population sizes, for different properties of interest, including for different genetic loci. The effective population size is most commonly ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Teleost
Teleostei (; Greek ''teleios'' "complete" + ''osteon'' "bone"), members of which are known as teleosts ), is, by far, the largest infraclass in the class Actinopterygii, the ray-finned fishes, containing 96% of all extant species of fish. Teleosts are arranged into about 40 orders and 448 family (biology), families. Over 26,000 species have been described. Teleosts range from giant oarfish measuring or more, and ocean sunfish weighing over , to the minute male anglerfish ''Photocorynus spiniceps'', just long. Including not only torpedo-shaped fish built for speed, teleosts can be flattened vertically or horizontally, be elongated cylinders or take specialised shapes as in anglerfish and seahorses. The difference between teleosts and other bony fish lies mainly in their jaw bones; teleosts have a movable premaxilla and corresponding modifications in the jaw musculature which make it possible for them to cranial kinesis, protrude their jaws outwards from the mouth. This is of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Travertine
Travertine ( ) is a form of terrestrial limestone deposited around mineral springs, especially hot springs. It often has a fibrous or concentric appearance and exists in white, tan, cream-colored, and even rusty varieties. It is formed by a process of rapid precipitation of calcium carbonate, often at the mouth of a hot spring or in a limestone cave. In the latter, it can form stalactites, stalagmites, and other speleothems. It is frequently used in Italy and elsewhere as a building material. Similar (but softer and extremely porous) deposits formed from ambient-temperature water are known as tufa. Definition Travertine is a sedimentary rock formed by the chemical precipitation of calcium carbonate minerals from fresh water, typically in springs, rivers, and lakes; that is, from surface and ground waters. In the broadest sense, travertine includes deposits in both hot and cold springs, including the porous, spongy rock known as tufa, and also the cave features known as speleot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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