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Kleptogenesis
In biology, a klepton (abbreviated kl.) and synklepton (abbreviated sk.) is a species that requires input from another biological taxon (normally from a species which is closely related to the kleptonic species) to complete its reproductive cycle. Specific types of kleptons are ''zygokleptons'', which reproduce by zygogenesis; ''gynokleptons'' which reproduce by gynogenesis, and ''tychokleptons'', which reproduce by a combination of both systems. Kleptogenic reproduction results in three potential outcomes: * A unisexual female may simply activate cell division in the egg through the presence of a male's sperm without incorporating any of his genetic material—this results in the production of clonal offspring. * The female may also incorporate the male's sperm into her egg, but can do so without excising any of her genetic material. This results in increased ploidy levels that range from triploid to pentaploid in wild individuals. * Finally, the female also has the option of re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parthenogenesis In Amphibians
Parthenogenesis is a form of reproduction where eggs develop without fertilization, resulting in unisexual species. This phenomenon is closely related with reproductive modes such as hybridogenesis, where fertilization occurs, but the paternal DNA is not passed on. Among amphibians, it is seen in numerous frog and salamander species, but has not been recorded in caecilians. Artificial parthenogenesis Haploid parthenogenesis has been achieved experimentally in amphibians, through approaches that could be considered artificial gynogenesis. Oscar Hertwig first achieved artificial parthenogenesis in frogs in 1911, using eggs fertilized by irradiated sperm. The radiation destroyed the DNA within the sperm, but nearly normal embryos were still produced. Gunther Hertwig repeated this experiment in 1924, using crosses between different frogs. A cross between a toad, ''Amietophrynus regularis'', and a frog, '' Rana fusca'', would not produce a viable embryo, but fertilization of a toad eg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ambystoma Laterale
The blue-spotted salamander (''Ambystoma laterale'') is a mole salamander native to the Great Lakes states and northeastern United States, and parts of Ontario and Quebec in Canada. Their range is known to extend to James Bay to the north, and southeastern Manitoba to the west. Description Blue-spotted salamanders are between in length, of which the tail comprises 40%. Generally, males are slightly smaller than their female counterparts (Donato 2000). Their skin is bluish-black, with characteristic blue and white flecks on its back, and bluish-white spots on the sides of its body and tail. They have elongated bodies. The vent is typically black, which contrasts with the paler belly. Larvae that have transformed may have yellow splotches; these turn blue once the individual becomes terrestrial. Occasionally, a melanistic individual may be found in the wild. They have long toes: four on the front feet and five on the hind feet. Typically, specimens will have 12–14 costal groov ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hybridization In Green Frogs
Hybridization (or hybridisation) may refer to: *Hybridization (biology), the process of combining different varieties of organisms to create a hybrid *Orbital hybridization, in chemistry, the mixing of atomic orbitals into new hybrid orbitals *Nucleic acid hybridization, the process of joining two complementary strands of nucleic acids - RNA, DNA or oligonucleotides *In evolutionary algorithms, the merging two or more optimization techniques into a single algorithm **Memetic algorithm, a common template for hybridization *In linguistics, the process of one variety blending with another variety *The alteration of a vehicle into a hybrid electric vehicle *In globalization theory, the ongoing blending of cultures *Hybridization in political election campaign communication, the combining of campaign techniques developed in different countries *In paleoanthropology, the hypothesis of Neanderthal and human hybridization See also *Hybrid (other) *Hybridity Hybridity, in its mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ambystoma Barbouri
The streamside salamander (''Ambystoma barbouri'') is a species of mole salamander from North America, occurring in several Midwestern states of the US. Description The streamside salamander is a medium-sized amystomatid salamander. It typically has a relatively small head and a short rounded snout. The salamander's body is relatively short and flaccid. There are 14-15 distinct costal grooves when fully grown. The tail is fairly short and thick, and it contains costal grooves that correspond directly to the vertebrae. Coloring is typically a dark black background covered in lichen-like markings in gray and brown. The species has more teeth, with a unique cusp shape, in its maxillary and premaxillary positions than its close relatives teeth, and is somewhat stockier. Distribution and habitat The species is found in central Kentucky, southwestern Ohio, southeastern Indiana. There is an isolated population in Livingston County, Kentucky. Overall distribution is uncertain due to t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eukaryotes
The eukaryotes ( ) constitute the domain of Eukaryota or Eukarya, organisms whose cells have a membrane-bound nucleus. All animals, plants, fungi, seaweeds, and many unicellular organisms are eukaryotes. They constitute a major group of life forms alongside the two groups of prokaryotes: the Bacteria and the Archaea. Eukaryotes represent a small minority of the number of organisms, but given their generally much larger size, their collective global biomass is much larger than that of prokaryotes. The eukaryotes emerged within the archaeal kingdom Promethearchaeati and its sole phylum Promethearchaeota. This implies that there are only two domains of life, Bacteria and Archaea, with eukaryotes incorporated among the Archaea. Eukaryotes first emerged during the Paleoproterozoic, likely as flagellated cells. The leading evolutionary theory is they were created by symbiogenesis between an anaerobic Promethearchaeati archaean and an aerobic proteobacterium, which form ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Poecilia Formosa
The Amazon molly (''Poecilia formosa'') is a freshwater fish native to the warm waters of northeastern Mexico and the southern parts of the U.S. state of Texas. It reproduces through gynogenesis, and essentially all individuals are females. The common name of "Amazon molly," acknowledges this trait as a reference to the Amazon warriors, a female-run society in Greek mythology. The Amazon molly is a hybrid species, and its parent species are the sailfin molly (''Poecilia latipinna'') and the Atlantic molly (''Poecilia mexicana''). In 1932, this species was the first vertebrate confirmed to be capable of asexual reproduction. ''Poecilia formosa'' gets its name from the Greek ''poikilos'' meaning "variegated" or "speckled," and the Latin ''formosa'' meaning "beautiful." Species description The Amazon molly shares many of the same general characteristics of its parent species. Some of these characteristics include a rounded caudal fin, a small anal fin, small pelvic fins, pectoral fi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pelophylax Bergeri
The Italian pool frog (''Pelophylax bergeri'') is a species of frog in the family Ranidae. Found on the mainland of Italy and the Mediterranean islands of Sicily, Elba, Corsica and Sardinia, its natural habitats are rivers, swamps, freshwater lakes and freshwater marshes. It is not considered threatened by the IUCN. Description The Italian pool frog grows to a snout-to-vent length of about and has a pointed snout and triangular-shaped head. The tongue is notched and it has vomerine teeth in the roof of its mouth. The skin is smooth and not warty. The colour is variable and depends on the animal's location, but is usually some shade of green with black spots, but may be reddish-brown or grey. There is a pale stripe running along the centre of the back. The underparts are greyish-white marked with dark blotches and the hind legs have dark stripes. Males have a pair of external vocal sacs on either side of the mouth which are only visible when the animal is calling. The voice is a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pelophylax Perezi
The Perez's frog (''Pelophylax perezi''), also known as Iberian waterfrog, Iberian green frog or Coruna frog, is a species of frog in the family Ranidae. It is native to southern France, Portugal, Spain, and has been introduced to the Canary and Balearic Islands, Madeira, the United Kingdom, and the Azores. In the Iberian Peninsula it is widespread and common. Its natural habitats are temperate forests, temperate shrubland, Mediterranean-type shrubby vegetation, rivers, intermittent rivers, swamps, freshwater lakes, intermittent freshwater lakes, freshwater marshes, intermittent freshwater marshes, sandy shores, arable land, and urban areas. It is not considered threatened by the IUCN. See also * Hybridogenesis in water frogs The Fertility, fertile Hybrid (biology), hybrids of Pelophylax, European water frogs (genus ''Pelophylax'') reproduce by hybridogenesis (hemiclonally). This means that during gametogenesis, they discard the genome of one of the parental species a ... ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pelophylax Ridibundus
The marsh frog (''Pelophylax ridibundus'') is a species of water frog native to Europe and parts of western Asia. Description The marsh frog is the largest type of frog in most of its range, with males growing to a size around 100 mm (3.9 in) SVL and females slightly larger (4 in) SVL. There is a large variation in colour and pattern, ranging from dark green to brown or grey, sometimes with some lighter green lines; a lighter line on the back is generally present. The frog will usually be darker coloured in early spring to absorb heat more efficiently. Tadpoles can reach up to 190 mm (7.3 in) in length, but this usually occurs in places with long winters where the tadpole has time to grow. File:Pelophylax ridibundus3.JPG, Tadpole File:PelophylaxRidibundusSpottedAdult.JPG, Female File:Marsh Frog imported from iNaturalist photo 400377577 on 3 December 2024 (cropped).jpg, Showing vocal sac. Distribution and habitat They occur in a large part of Euro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pelophylax Kl
''Pelophylax'' is a genus of true frogs widespread in Eurasia, with a few species ranging into northern Africa. This genus was erected by Leopold Fitzinger in 1843 to accommodate the green frogs of the Old World, which he considered distinct from the brown pond frogs of Carl Linnaeus' genus ''Rana''. They are also known as water frogs, as they spend much of the summer living in aquatic habitat; the pond frogs can be found more often, by comparison, on dry land, as long as there is sufficient humidity. Yet there are species of Eurasian green frogs – the Central Asian '' P. terentievi'', or the Sahara frog (''P. saharicus'') – which inhabit waterholes in the desert. Systematics and taxonomy Most authors throughout the 19th and 20th century disagreed with Fitzinger's assessment. The green frogs were included again with the brown frogs, in line with the tendency to place any frog similar in habitus to the common frog (''R. temporaria'') in ''Rana''. That genus, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
