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Melanophryniscus Montevidensis
''Melanophryniscus montevidensis'', also called Darwin's toad, is a species of toad in the family Bufonidae and the genus Melanophryniscus found in Brazil and Uruguay. Like other amphibians in its genus, its bright colors, defensive behavior, and rapid metamorphosis make it stand out. It also has a myriad of chemical compounds on its skin that could be used in biomedical applications.Langone, José A. (Mayo 2002). Melanophryniscus, interesantes sapitos uruguayos». ''MUSEO NACIONAL DE HISTORIA NATURAL Y ANTROPOLOGIA'' (4). Consultado el 2023-06-22. Darwin's toad is jet black with yellow patches on its back, sides, forelimbs, and ventral. It has a red spot on the ventral side of the thigh and part of the abdomen. The palms of his hands and soles of its feet are also red. Habitat and Behavior The Darwin's toad's natural habitats are temperate shrubland, intermittent freshwater marshes, and sandy shores. This species can be found on the coast of the RÃo de la Plata and the Atlan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charles Darwin
Charles Robert Darwin ( ; 12 February 1809 – 19 April 1882) was an English naturalist, geologist, and biologist, widely known for his contributions to evolutionary biology. His proposition that all species of life have descended from a common ancestor is now generally accepted and considered a fundamental concept in science. In a joint publication with Alfred Russel Wallace, he introduced his scientific theory that this branching pattern of evolution resulted from a process he called natural selection, in which the struggle for existence has a similar effect to the artificial selection involved in selective breeding. Darwin has been described as one of the most influential figures in human history and was honoured by burial in Westminster Abbey. Darwin's early interest in nature led him to neglect his medical education at the University of Edinburgh; instead, he helped to investigate marine invertebrates. His studies at the University of Cambridge's Christ's Col ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RÃo De La Plata
The RÃo de la Plata (, "river of silver"), also called the River Plate or La Plata River in English, is the estuary formed by the confluence of the Uruguay River and the Paraná River at Punta Gorda. It empties into the Atlantic Ocean and forms a funnel-shaped indentation on the southeastern coastline of South America. Depending on the geographer, the RÃo de la Plata may be considered a river, an estuary, a gulf, or a marginal sea. If considered a river, it is the widest in the world, with a maximum width of . The river is about long and widens from about at its source to about at its mouth. It forms part of the border between Argentina and Uruguay. The name RÃo de la Plata is also used to refer to the populations along the estuary, especially the main port cities of Buenos Aires and Montevideo, where RÃoplatense Spanish is spoken and tango culture developed. The coasts of the river are the most densely-populated areas of Uruguay and Argentina. Geography The RÃo d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urbanization
Urbanization (or urbanisation) refers to the population shift from rural to urban areas, the corresponding decrease in the proportion of people living in rural areas, and the ways in which societies adapt to this change. It is predominantly the process by which towns and cities are formed and become larger as more people begin living and working in central areas. Although the two concepts are sometimes used interchangeably, urbanization should be distinguished from urban growth. Urbanization refers to the ''proportion'' of the total national population living in areas classified as urban, whereas urban growth strictly refers to the ''absolute'' number of people living in those areas. It is predicted that by 2050 about 64% of the developing world and 86% of the developed world will be urbanized. That is equivalent to approximately 3 billion urbanites by 2050, much of which will occur in Africa and Asia. Notably, the United Nations has also recently projected that nearly all gl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Habitat Destruction
Habitat destruction (also termed habitat loss and habitat reduction) is the process by which a natural habitat becomes incapable of supporting its native species. The organisms that previously inhabited the site are displaced or dead, thereby reducing biodiversity and species abundance. Habitat destruction is the leading cause of biodiversity loss. Fragmentation and loss of habitat have become one of the most important topics of research in ecology as they are major threats to the survival of endangered species. Activities such as harvesting natural resources, industrial production and urbanization are human contributions to habitat destruction. Pressure from agriculture is the principal human cause. Some others include mining, logging, trawling, and urban sprawl. Habitat destruction is currently considered the primary cause of species extinction worldwide. Environmental factors can contribute to habitat destruction more indirectly. Geological processes, climate change, introdu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vulnerable Species
A vulnerable species is a species which has been Conservation status, categorized by the International Union for Conservation of Nature as being threatened species, threatened with extinction unless the circumstances that are threatened species, threatening its survival and reproduction improve. Vulnerability is mainly caused by habitat loss or destruction of the species' home. Vulnerable habitat or species are monitored and can become increasingly threatened. Some species listed as "vulnerable" may be common in captivity (animal), captivity, an example being the military macaw. There are currently 5196 animals and 6789 plants classified as Vulnerable, compared with 1998 levels of 2815 and 3222, respectively. Practices such as cryoconservation of animal genetic resources have been enforced in efforts to conserve vulnerable breeds of livestock specifically. Criteria The International Union for Conservation of Nature uses several criteria to enter species in this category. A tax ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Unkenreflex
Unkenreflex – interchangeably referred to as unken reflex (''Unke'' is the German word for the genus of fire-bellied toads) – is a defensive posture adopted by several branches of the amphibian class – including salamanders, toads, and certain species of frogs. Implemented most often in the face of an imminent attack by a predator, unkenreflex is characterized by the subject’s contortion or arching of its body to reveal previously hidden bright colors of the ventral side, tail, or inner limb; the subject remains immobile while in unkenreflex. During the course of unkenreflex, the amphibian in question releases bufotoxins from its parotid glands, tenses its entire body, and swallows air to bloat itself in an attempt to look larger. These secretions, along with the Aposematism, aposematic coloring common among the amphibians which display unkenreflex, serve as a warning to nearby predators that the amphibian may be poisonous. Not all amphibians which display unkenreflexes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diurnality
Diurnality is a form of plant and ethology, animal behavior characterized by activity during daytime, with a period of sleeping or other inactivity at night. The common adjective used for daytime activity is "diurnal". The timing of activity by an animal depends on a variety of environmental factors such as the temperature, the ability to gather food by sight, the risk of predation, and the time of year. Diurnality is a cycle of activity within a 24-hour period; cyclic activities called circadian rhythms are endogenous cycles not dependent on external cues or environmental factors except for a zeitgeber. Animals active during twilight are crepuscular, those active during the night are nocturnal and animals active at sporadic times during both night and day are cathemerality, cathemeral. Plants that open their flowers during the daytime are described as diurnal, while those that bloom during nighttime are nocturnal. The timing of flower opening is often related to the time at which ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Psammophiliella
''Psammophiliella'' is a genus of flowering plants in the family Caryophyllaceae. It has only one species, ''Psammophiliella muralis'' (synonym ''Gypsophila muralis''), known as annual gypsophila, cushion baby's-breath and low baby's-breath, an annual plant principally native to Europe except the British Isles. It can be also found in Central Asia, Turkey, the Caucasus, and Siberia. Description ''Psammophiliella muralis'' is an annual,Flora of North America Editorial Committee (editors) with erect glabrous (non hairy) stems. It grows up to tall, with linear shaped leaves. It blooms between summer and fall, with pink or very occasionally white flowers, which are across. Later it has fruit capsules, which are ovoid or ellipsoid, inside are snail-shaped seeds. Taxonomy The species was first described by the Swedish botanist Carl Linnaeus in ''Species Plantarum'' on page 408 in 1753, as ''Gypsophila muralis''. It was once confused with ''Petrorhagia saxifraga'' (L) Link. The Lat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rio Grande Do Sul
Rio Grande do Sul (, , ; "Great River of the South") is a Federative units of Brazil, state in the South Region, Brazil, southern region of Brazil. It is the Federative_units_of_Brazil#List, fifth-most-populous state and the List of Brazilian states by area, ninth largest by area. Located in the southernmost part of the country, Rio Grande do Sul is bordered clockwise by Santa Catarina (state), Santa Catarina to the north and northeast, the Atlantic Ocean to the east, the Uruguayan Departments of Uruguay, departments of Rocha Department, Rocha, Treinta y Tres Department, Treinta y Tres, Cerro Largo Department, Cerro Largo, Rivera Department, Rivera and Artigas Department, Artigas to the south and southwest, and the Argentina, Argentine Provinces of Argentina, provinces of Corrientes Province, Corrientes and Misiones Province, Misiones to the west and northwest. The capital and largest city is Porto Alegre. The state has the highest life expectancy in Brazil, and the crime rate i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Santiago Vázquez, Montevideo
Santiago Vázquez is a village at the western limits of Montevideo Department in Uruguay. Location It is located at the mouth of the river RÃo Santa LucÃa towards the RÃo de la Plata, from the centre of Montevideo. History It was given this name by a decree of 1912, in honor of a politician and co-founder of the Constitution of 1830. It was declared a "Pueblo" by decree Ley Nº 4.049 on 1 July 1912. Population In 2004, Santiago Vázquez had a population of 1,482 inhabitants. Source: ''Instituto Nacional de EstadÃstica de Uruguay'' Features It is surrounded by an ecologically important natural environment consisting of the coasts, beaches and hills. It has a natural port which is part of the river delta and includes 25.000 hectares of wetlands. During the first half of the 20th century the village was converted into a touristic centre, marked by the construction of the "Hotel de la Barra", the boat races, the yacht club and the parks "Parque Segunda República Española" ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atlantic Ocean
The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about . It covers approximately 20% of Earth's surface and about 29% of its water surface area. It is known to separate the " Old World" of Africa, Europe and Asia from the "New World" of the Americas in the European perception of the World. The Atlantic Ocean occupies an elongated, S-shaped basin extending longitudinally between Europe and Africa to the east, and North and South America to the west. As one component of the interconnected World Ocean, it is connected in the north to the Arctic Ocean, to the Pacific Ocean in the southwest, the Indian Ocean in the southeast, and the Southern Ocean in the south (other definitions describe the Atlantic as extending southward to Antarctica). The Atlantic Ocean is divided in two parts, by the Equatorial Counter Current, with the North(ern) Atlantic Ocean and the South(ern) Atlantic Ocean split at about 8°N. Scientific explorations of the A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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