|
Panamanian Golden Frog
The Panamanian golden frog (''Atelopus zeteki''), also known as Cerro Campana stubfoot toad and other names, is a species of toad endemic to Panama. Panamanian golden frogs inhabit the streams along the mountainous slopes of the Cordilleran cloud forests of west-central Panama. While the IUCN lists it as Critically Endangered, it may in fact have been extinct in the wild since 2007. Individuals have been collected for breeding in captivity in a bid to preserve the species. The alternative common name, Zetek's golden frog, and the epithet ''zeteki'' both commemorate the entomologist James Zetek. Description Despite its common name, the Panamanian golden frog is a true toad, a member of the family Bufonidae. It was first described as a subspecies of ''Atelopus varius'', but is now classified as a separate species. The Panamanian golden frog is a national symbol and is considered to be one of the most beautiful frogs in Panama. The skin colour ranges from light yellow-green to b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emmett Reid Dunn
Emmett Reid Dunn (November 21, 1894 in Alexandria, Virginia – February 13, 1956) was an American Herpetology, herpetologist noted for his work in Panama and for studies of salamanders in the Eastern United States. Biography He attended Haverford College as an undergraduate and received his PhD from Harvard University. After receiving his PhD, he taught at Smith College. He left Smith to study on a Guggenheim Fellowship, following which he became a professor of biology at Haverford College. He was also curator of reptiles and amphibians at the Academy of Natural Sciences, Philadelphia. He served as editor of ''Copeia'' from 1924 to 1929. Eponyms A number of reptiles were named in honor of Dunn, both species (binomials)species:Bo Beolens, Beolens, Bo; species:Michael Watkins, Watkins, Michael; Grayson, Michael (2011). ''The Eponym Dictionary of Reptiles''. Baltimore: Johns Hopkins University Press. xiii + 296 pp. . ("Dunn", pp. 77-78). and subspecies (trinomials), including t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alkaloid
Alkaloids are a class of basic, naturally occurring organic compounds that contain at least one nitrogen atom. This group also includes some related compounds with neutral and even weakly acidic properties. Some synthetic compounds of similar structure may also be termed alkaloids. In addition to carbon, hydrogen and nitrogen, alkaloids may also contain oxygen, sulfur and, more rarely, other elements such as chlorine, bromine, and phosphorus.Chemical Encyclopedia: alkaloids xumuk.ru Alkaloids are produced by a large variety of organisms including , , Medicinal plant, plants, an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amplexus
Amplexus (Latin "embrace") is a type of mating behavior exhibited by some externally fertilizing species (chiefly amphibians and horseshoe crabs) in which a male grasps a female with his front legs as part of the mating process, and at the same time or with some time delay, he fertilizes the eggs, as they are released from the female's body. In amphibians, females may be grasped by the head, waist, or armpits, and the type of amplexus is characteristic of some taxonomic groups. Amplexus involves direct contact between male and female, distinguished from other forms of external fertilization, such as broadcast spawning, where sperm and eggs are freely shed into water without direct contact by individuals. In order for amplexus to be initiated, male frogs must first find a mate by attracting one through calls, typically in the evening. Once a male has successfully attracted a mate, the process of amplexus begins, while the unsuccessful males are forced to continue their search fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Evolution
Evolution is change in the heritable characteristics of biological populations over successive generations. These characteristics are the expressions of genes, which are passed on from parent to offspring during reproduction. Variation tends to exist within any given population as a result of genetic mutation and recombination. Evolution occurs when evolutionary processes such as natural selection (including sexual selection) and genetic drift act on this variation, resulting in certain characteristics becoming more common or more rare within a population. The evolutionary pressures that determine whether a characteristic is common or rare within a population constantly change, resulting in a change in heritable characteristics arising over successive generations. It is this process of evolution that has given rise to biodiversity at every level of biological organisation, including the levels of species, individual organisms, and molecules. The theory of evolution by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adaptation
In biology, adaptation has three related meanings. Firstly, it is the dynamic evolutionary process of natural selection that fits organisms to their environment, enhancing their evolutionary fitness. Secondly, it is a state reached by the population during that process. Thirdly, it is a phenotypic trait or adaptive trait, with a functional role in each individual organism, that is maintained and has evolved through natural selection. Historically, adaptation has been described from the time of the ancient Greek philosophers such as Empedocles and Aristotle. In 18th and 19th century natural theology, adaptation was taken as evidence for the existence of a deity. Charles Darwin proposed instead that it was explained by natural selection. Adaptation is related to biological fitness, which governs the rate of evolution as measured by change in allele frequencies. Often, two or more species co-adapt and co-evolve as they develop adaptations that interlock with those of the oth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flag Semaphore
Flag semaphore (from the Ancient Greek () 'sign' and - (-) '-bearer') is a semaphore system conveying information at a distance by means of visual signals with hand-held flags, rods, disks, paddles, or occasionally bare or gloved hands. Information is encoded by the position of the flags; it is read when the flag is in a fixed position. Semaphores were adopted and widely used (with hand-held flags replacing the mechanical arms of shutter semaphores) in the maritime world in the 19th century. It is still used during underway replenishment at sea and is acceptable for emergency communication in daylight or using lighted wands instead of flags, at night. Contemporary semaphore flag system The current flag semaphore system uses two short poles with square flags, which a signal person holds in different positions to signal letters of the alphabet and numbers. The signaller holds one pole in each hand, and extends each arm in one of eight possible directions. Except for in the re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chytridiomycosis
Chytridiomycosis ( ) is an infectious disease in amphibians, caused by the chytrid fungi ''Batrachochytrium dendrobatidis'' and ''Batrachochytrium salamandrivorans''. Chytridiomycosis has been linked to dramatic population declines or extinctions of amphibian species in western North America, Central America, South America, eastern Australia, east Africa (Tanzania), and Dominica and Montserrat in the Caribbean. Much of the New World is also at risk of the disease arriving within the coming years. The fungus is capable of causing sporadic deaths in some amphibian populations and 100% mortality in others. No effective measure is known for control of the disease in wild populations. Various clinical signs are seen by individuals affected by the disease. A number of options are possible for controlling this disease-causing fungus, though none has proved to be feasible on a large scale. The disease has been proposed as a contributing factor to a global decline in amphibian populat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
El Copé
El Copé is a Corregimientos of Panama, ''corregimiento'' (subdistrict) in Olá District, Coclé Province, Panama. It has a land area of and had a population of 1,425 as of 2010, giving it a population density of . Its population as of 1990 was 1,081; its population as of 2000 was 1,263. See also *El Copé National Park References Corregimientos of Coclé Province {{Coclé-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Panamá Province
Panamá is a province of Panama. It is the location of the national capital Panama City, which also serves as the provincial capital. The governor of the province is Judy Meana, appointed by President Laurentino Cortizo and sworn in on 16 April 2020. Administrative divisions Panamá Province is now divided into 6 ''distritos'' (districts) and subdivided into 55 '' corregimientos''. The five former districts west of the Panama Canal were split off to form Panamá Oeste Province Panamá Oeste (; "West Panama" in English) is the newest province in Panama. It was created from the five districts of Panamá Province west of the Panama Canal The Panama Canal ( es, Canal de Panamá, link=no) is an artificial waterway i ... on 1 January 2014. 1 These ''corregimientos'' represent as Panama City 2 These ''corregimientos'' represent as San Miguelito City References {{DEFAULTSORT:Panama Province Provinces of Panama ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coclé Province
Coclé () is a province of central Panama on the nation's southern coast. The administrative capital is the city of Penonomé. This province was created by the Act of September 12, 1855 with the title of Department of Coclé during the presidency of Dr. Justo de Arosemena. It became a province, Decretory Number 190, on October 20, 1985. Coclé is primarily an agricultural area, with sugar and tomatoes as major crops. The province has a number of well-known beaches, such as Santa Clara, Farallon and Rio Hato, and tourist activity has increased in recent years. It covers an area of 4,946.6 sq.km, and had a population of 265,149 in 2019. Pre-Columbian Coclé During pre-Columbian times, the area of Panama which today includes Coclé province had a number of identifiable native cultures. Archaeologists have loosely designated these cultures by pottery style. The poorly studied La Mula period ranged from 150 BC to AD 300. It was followed by the Tonosi period, from AD 300 to AD ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saxitoxin
Saxitoxin (STX) is a potent neurotoxin and the best-known paralytic shellfish toxin (PST). Ingestion of saxitoxin by humans, usually by consumption of shellfish contaminated by toxic algal blooms, is responsible for the illness known as paralytic shellfish poisoning (PSP). The term saxitoxin originates from the genus name of the butter clam (''Saxidomus'') from which it was first isolated. But the term saxitoxin can also refer to the entire suite of more than 50 structurally related neurotoxins (known collectively as "saxitoxins") produced by protists, algae and cyanobacteria which includes saxitoxin itself (STX), neosaxitoxin (NSTX), gonyautoxins (GTX) and decarbamoylsaxitoxin (dcSTX). Saxitoxin has a large environmental and economic impact, as its presence in bivalve shellfish such as mussels, clams, oysters and scallops frequently leads to bans on commercial and recreational shellfish harvesting in many temperate coastal waters around the world including the Northeastern and W ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
