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Dalhousie Goby
The Dalhousie goby (''Chlamydogobius gloveri'') is a species of goby endemic to Australia where it lives in the Dalhousie Springs. This species can reach a standard length of . It feeds on small molluscs, crustaceans and other odds and ends like most other gobies. Etymology The scientific name "Chlamydogobius gloveri" is derived from the Greek word "chlamys" meaning cloak, whilst the word "gobius" is defined as gudgeon in Latin.> The second half of the species is named "gloveri" in honour of the late John Glover, a former Curator of Fishes at the South Australian Museum, who worked extensively on desert gobies and other taxa of fishes found in the deserts of Australia. Glover was sure that this goby was a distinct species from '' Chlamydogobius eremius'' but he did not describe it. The species was documented throughout the 1980s and Charles Glover specifically wrote about the fish in 1989. Prominent Australian ichthyologist, Helen K Larson, also documented this species in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helen Kay Larson
Helen K. Larson is an ichthyologist who specialises in the fishes of the Indo-Pacific. In the 1960s and 1970s, she attended the University of Guam to study for her Bachelor's and master's degrees and while there she also worked in the local Marine Laboratory. While there she collected and described a new species of the dwarf goby from the genus '' Eviota'', '' Eviota pellucida'', the description being published in 1976 in the journal ''Copeia''. This was her first description of a new species. Her Masters was called ''Notes on the biology and comparative behaviour of ''Eviota zonura'' and ''Eviota smaragdus'' (Pisces:Gobiidae)''. She gained a PhD in Zoology from the University of Queensland and her thesis was ''A revision of the gobiid fish genus ''Mugilogobius'' (Teleostei: Gobioidei), and its systematic placement''. She moved from Guam in 1974 to work with Douglass F. Hoese at the Australian Museum in Sydney as a Technical Officer and in 1981 she took a position as Curat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Endemic (epidemiology)
In epidemiology, an infection is said to be endemic in a specific population or populated place when that infection is constantly maintained at a baseline level without extra infections being brought into the group as a result of travel or similar means. An endemic disease always has a steady, predictable number of people getting sick, but that number can be high (''hyperendemic'') or low (''hypoendemic''), and the disease can be severe or mild. Also, a disease that is usually endemic can become epidemic. For example, chickenpox is endemic (steady state) in the United Kingdom, but malaria is not. Every year, there are a few cases of malaria reported in the UK, but these do not lead to sustained transmission in the population due to the lack of a suitable vector (mosquitoes of the genus ''Anopheles''). Consequently, the number of people infected by malaria is too variable to be called endemic. However, the number of people who get chickenpox in the UK varies little from y ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vertebra
The spinal column, a defining synapomorphy shared by nearly all vertebrates, Hagfish are believed to have secondarily lost their spinal column is a moderately flexible series of vertebrae (singular vertebra), each constituting a characteristic irregular bone whose complex structure is composed primarily of bone, and secondarily of hyaline cartilage. They show variation in the proportion contributed by these two tissue types; such variations correlate on one hand with the cerebral/caudal rank (i.e., location within the backbone), and on the other with phylogenetic differences among the vertebrate taxa. The basic configuration of a vertebra varies, but the bone is its ''body'', with the central part of the body constituting the ''centrum''. The upper (closer to) and lower (further from), respectively, the cranium and its central nervous system surfaces of the vertebra body support attachment to the intervertebral discs. The posterior part of a vertebra forms a vertebral ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dorsal Fin
A dorsal fin is a fin located on the back of most marine and freshwater vertebrates within various taxa of the animal kingdom. Many species of animals possessing dorsal fins are not particularly closely related to each other, though through convergent evolution they have independently evolved external superficial fish-like body plans adapted to their marine environments, including most numerously fish, but also mammals such as cetaceans ( whales, dolphins, and porpoises), and even extinct ancient marine reptiles such as various known species of ichthyosaurs. Most species have only one dorsal fin, but some have two or three. Wildlife biologists often use the distinctive nicks and wear patterns which develop on the dorsal fins of large cetaceans to identify individuals in the field. The bony or cartilaginous bones that support the base of the dorsal fin in fish are called ''pterygiophores''. Functions The main purpose of the dorsal fin is to stabilize the animal against ro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Desert Goby
''Chlamydogobius'' is a genus of gobies from Australia. All but one coastal species (''C. ranunculus'') are found in inland waters, such as springs, pools, creeks and streams. Most species live in extreme environments; for example, several species of ''Chlamydogobius'' are found in the water that emerges from geothermal springs, such as the Dalhousie goby, found in the waters around Dalhousie Springs. These fish can live in water with a wide range of temperatures, pH, salinity, and oxygen levels; for example they are found in water with a pH between 6.8 and 9.0, and temperatures between . They can tolerate salinity as high as 60 parts per thousand (almost twice that of sea water). They have been found in water with extremely low oxygen levels (as low as 0.8 ppm). Their water habitats often exhibit oxygen levels below 5 milligrams of oxygen per litre. To cope with extremely low oxygen levels, they will emerge from the water to "gulp" air (known as aerial respiration). They al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Salinity
Salinity () is the saltiness or amount of salt (chemistry), salt dissolved in a body of water, called saline water (see also soil salinity). It is usually measured in g/L or g/kg (grams of salt per liter/kilogram of water; the latter is dimensionless and equal to ‰). Salinity is an important factor in determining many aspects of the chemistry of natural waters and of biological processes within it, and is a state function, thermodynamic state variable that, along with temperature and pressure, governs physical characteristics like the density and heat capacity of the water. A contour line of constant salinity is called an ''isohaline'', or sometimes ''isohale''. Definitions Salinity in rivers, lakes, and the ocean is conceptually simple, but technically challenging to define and measure precisely. Conceptually the salinity is the quantity of dissolved salt content of the water. Salts are compounds like sodium chloride, magnesium sulfate, potassium nitrate, and sodium bicarbo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Predation
Predation is a biological interaction where one organism, the predator, kills and eats another organism, its prey. It is one of a family of common feeding behaviours that includes parasitism and micropredation (which usually do not kill the host) and parasitoidism (which always does, eventually). It is distinct from scavenging on dead prey, though many predators also scavenge; it overlaps with herbivory, as seed predators and destructive frugivores are predators. Predators may actively search for or pursue prey or wait for it, often concealed. When prey is detected, the predator assesses whether to attack it. This may involve ambush or pursuit predation, sometimes after stalking the prey. If the attack is successful, the predator kills the prey, removes any inedible parts like the shell or spines, and eats it. Predators are adapted and often highly specialized for hunting, with acute senses such as vision, hearing, or smell. Many predatory animals, both vertebrate an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perch
Perch is a common name for fish of the genus ''Perca'', freshwater gamefish belonging to the family Percidae. The perch, of which three species occur in different geographical areas, lend their name to a large order of vertebrates: the Perciformes, from the el, πέρκη (), simply meaning perch, and the Latin ''forma'' meaning shape. Many species of freshwater gamefish more or less resemble perch, but belong to different genera. In fact, the exclusively saltwater-dwelling red drum is often referred to as a red perch, though by definition perch are freshwater fish. Though many fish are referred to as perch as a common name, to be considered a true perch, the fish must be of the family Percidae. The type species for this genus is the European perch, ''P. fluviatilis''. Species Most authorities recognize three species within the perch genus: * The European perch (''P. fluviatilis'') is primarily found in Europe, but a few can also be found in South Africa, and even as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vegetation
Vegetation is an assemblage of plant species and the ground cover they provide. It is a general term, without specific reference to particular taxa, life forms, structure, spatial extent, or any other specific botanical or geographic characteristics. It is broader than the term ''flora'' which refers to species composition. Perhaps the closest synonym is plant community, but ''vegetation'' can, and often does, refer to a wider range of spatial scales than that term does, including scales as large as the global. Primeval redwood forests, coastal mangrove stands, sphagnum bogs, desert soil crusts, roadside weed patches, wheat fields, cultivated gardens and lawns; all are encompassed by the term ''vegetation''. The vegetation type is defined by characteristic dominant species, or a common aspect of the assemblage, such as an elevation range or environmental commonality. The contemporary use of ''vegetation'' approximates that of ecologist Frederic Clements' term earth cover ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Temperature
Temperature is a physical quantity that expresses quantitatively the perceptions of hotness and coldness. Temperature is measurement, measured with a thermometer. Thermometers are calibrated in various Conversion of units of temperature, temperature scales that historically have relied on various reference points and thermometric substances for definition. The most common scales are the Celsius scale with the unit symbol °C (formerly called ''centigrade''), the Fahrenheit scale (°F), and the Kelvin scale (K), the latter being used predominantly for scientific purposes. The kelvin is one of the seven base units in the International System of Units (SI). Absolute zero, i.e., zero kelvin or −273.15 °C, is the lowest point in the thermodynamic temperature scale. Experimentally, it can be approached very closely but not actually reached, as recognized in the third law of thermodynamics. It would be impossible to extract energy as heat from a body at that temperature. Tem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phragmites
''Phragmites'' () is a genus of four species of large perennial reed grasses found in wetlands throughout temperate and tropical regions of the world. Taxonomy The World Checklist of Selected Plant Families, maintained by Kew Garden in London, accepts the following four species: * '' Phragmites australis'' ( Cav.) Trin. ex Steud. – cosmopolitan * '' Phragmites japonicus'' Steud. – Japan, Korea, Ryukyu Islands, Russian Far East * '' Phragmites karka'' ( Retz.) Trin. ex Steud. – tropical Africa, southern Asia, Australia, some Pacific Islands, invasive in New Zealand * '' Phragmites mauritianus'' Kunth – central + southern Africa, Madagascar, Mauritius The cosmopolitan common reed has the generally accepted botanical name ''Phragmites australis''. (Cav.) Trin. ex Steud. About 130 other synonyms have been proposed. Examples include ''Phragmites communis'' Trin., ''Arundo phragmites'' L., and ''Phragmites vulgaris'' (Lam.) Crép. (illegitimate name). Wildlife in r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Great Artesian Basin
The Great Artesian Basin (GAB), located in Australia, is the largest and deepest artesian basin in the world, stretching over , with measured water temperatures ranging from . The basin provides the only source of fresh water through much of inland Australia. The Basin underlies 22% of the continent, including the states and territories of Queensland (most of), the Northern Territory (the south-east corner of), South Australia (the north-east part of), and New South Wales (northern part of). The basin is deep in places and is estimated to contain of groundwater. The Great Artesian Basin Coordinating Committee (GABCC) GABCC website coordinates activity between the various levels of government and community organisations. Physiography This area is one of the distinct physiographic provinces of the larger[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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