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Cactus Roach
The cactus roach (''Rutilus virgo'') is a species of freshwater ray-finned fish belonging to the family Leuciscidae, which includes the daces, Eurasian minnows and related fishes. This species occurs in central and eastern Europe, including the northern Balkans. Taxonomy The cactus roach was first formally described as ''Leuciscus virgo'' in 1852 by the Austrian zoologist Johann Jakob Heckel with its type locality given as the Danube River near Vienna in Austria. This species is now classified within the genus ''Rutilus'' in the subfamily Leuciscinae of the family Leuciscidae. This species and the pigo or Italian roach (''R. pigus''), of the northern Adriatic basin, were previously considered to be the same species. However, molecular analyses published since the late 2000s have shown that these are two separate valid species. Etymology The cactus roach belongs to the genus ''Rutilus'', a name which means "red, golden red and reddish yellow" and is an allusion to the red colour ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Johann Jakob Heckel
Johann Jakob Heckel (23 January 1790 – 1 March 1857) was an Austrian taxidermist, zoology, zoologist, and ichthyology, ichthyologist from Mannheim in the Electoral Palatinate. He worked at the Royal natural history cabinet in Vienna which later became the Austrian Museum of Natural History. Life Heckel was born in Mannheim, the son of a namesake music teacher and Sophia née Reinhardt. He also had a namesake brother who studied music and was educated at home and lived in Vienna for a while. Another brother was Karl Ferdinand Heckel (1800-1870) who also studied music. In 1805 the family fled the French to Pressburg and then to Pest. Heckel visited the Georgicon agricultural college in 1806. His father bought a farm in Gumpoldskirchen and after the death of his father in December 1811, his mother took over the farm, assisted by his brother. He married Barbara Baumgartner in 1817 and in 1818 he was working at the Vienna Naturaliencabinet (which later became the Naturhistorisches Mu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vernacular Name
Vernacular is the ordinary, informal, spoken form of language, particularly when perceived as having lower social status or less prestige than standard language, which is more codified, institutionally promoted, literary, or formal. More narrowly, a particular language variety that does not hold a widespread high-status perception, and sometimes even carries social stigma, is also called a vernacular, vernacular dialect, nonstandard dialect, etc. and is typically its speakers' native variety. Regardless of any such stigma, all nonstandard dialects are full-fledged varieties of language with their own consistent grammatical structure, sound system, body of vocabulary, etc. Overview Like any native language variety, a vernacular has an internally coherent system of grammar. It may be associated with a particular set of vocabulary, and spoken using a variety of accents, styles, and registers. As American linguist John McWhorter describes about a number of dialects spok ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Periphyton
Periphyton is a complex mixture of algae, cyanobacteria, heterotrophic microbes, and detritus that is attached to submerged surfaces in most aquatic ecosystems. The related term Aufwuchs ( German "surface growth" or "overgrowth", ) refers to the collection of small animals and plants that adhere to open surfaces in aquatic environments, such as parts of rooted plants. Periphyton serves as an important food source for invertebrates, tadpoles, and some fish. It can also absorb contaminants, removing them from the water column and limiting their movement through the environment. The periphyton is also an important indicator of water quality; responses of this community to pollutants can be measured at a variety of scales representing physiological to community-level changes. Periphyton has often been used as an experimental system in, e.g., pollution-induced community tolerance studies. Composition In both marine and freshwater environments, algae – particularly green algae a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Olomouc
Olomouc (; ) is a city in the Czech Republic. It has about 103,000 inhabitants, making it the Statutory city (Czech Republic), sixth largest city in the country. It is the administrative centre of the Olomouc Region. Located on the Morava (river), Morava River, the city is the ecclesiastical metropolis and was a historical co-capital city of Moravia, before having been occupied by the Military of the Swedish Empire, Swedish army during the Thirty Years' War. The historic city centre is well preserved and is protected as Cultural monument (Czech Republic)#Monument reservations, urban monument reservation. The Holy Trinity Column in Olomouc, Holy Trinity Column was listed as a UNESCO World Heritage Site in 2000 for its quintessential Baroque architecture, Baroque style and symbolic value. Administrative division Olomouc consists of 26 municipal parts (in brackets population according to the 2021 census): *Olomouc (13,446) *Bělidla (834) *Černovír (1,010) *Chomoutov (1,070) *Ch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thaya River
The Thaya (, ) is a river in the Czech Republic and Austria, a right tributary of the Morava River. It flows through the South Moravian Region in the Czech Republic and through Lower Austria in Austria. It is formed by the confluence of the German Thaya and Moravian Thaya rivers. Together with the German Thaya, which is its main source, the Thaya is long. Without the German Thaya, it is long. In the Czech Republic, the Thaya is the seventh longest river in the country with a length of . Etymology Both the names Thaya and Dyje have their origin in the Illyrian word 'duja', which can be translated as 'rushing river'. The first written mention of Thaya is from 985, when the name was written as ''Taja''. Characteristic From a water management point of view, the Thaya and German Thaya are two different rivers with separate numbering of river kilometres. From a broader point of view, the Thaya (as German Thaya) originates in the territory of Schweiggers at an elevation of and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Morava (river)
The Morava () is a river in Central Europe, a left tributary of the Danube. It is the main river of Moravia historical region in the Czech Republic, which derives its name from the river. The Morava originates on the Králický Sněžník mountain in the north-eastern corner of Pardubice Region, near the border between the Czech Republic and Poland and has a vaguely southward trajectory. The lower part of the river's course forms the border between the Czech Republic and Slovakia and then between Austria and Slovakia. Etymology The root of the river's name, ''mor-'', is derived from the Proto-Indo-European word for 'water', 'marsh', from which the Latin word ''mare'' arose. The suffix ''-ava'' is a Slavic form of the Proto-Germanic word ''ahwa'', meaning 'water', 'river'. The name of the river was first documented as ''Maraha'' in an 892 deed. The river gave its name to the entire historical land of Moravia, yet the oldest surviving record of the land (from 822) is older than the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tisza
The Tisza, Tysa or Tisa (see below) is one of the major rivers of Central and Eastern Europe. It was once called "the most Hungarian river" because it used to flow entirely within the Kingdom of Hungary. Today, it crosses several national borders. The Tisza begins near Rakhiv in Ukraine, at the confluence of the and , which is at coordinates (the former springs in the Chornohora mountains; the latter in the Gorgany range). From there, the Tisza flows west, roughly following Ukraine's borders with Romania and Hungary, then briefly as the border between Slovakia and Hungary, before entering into Hungary, and finally into Serbia. The Tisza enters Hungary at Tiszabecs, traversing the country from north to south. A few kilometers south of the Hungarian city of Szeged, it enters Serbia. Finally, it joins the Danube near the village of Stari Slankamen in Vojvodina, Serbia. The Tisza drains an area of about and has a length of Its mean annual discharge is seasonally to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iron Gates
The Iron Gates (; ; ; Hungarian: ''Vaskapu-szoros'') is a gorge on the river Danube. It forms part of the boundary between Serbia (to the south) and Romania (north). In the broad sense it encompasses a route of ; in the narrow sense it only encompasses the last barrier on this route, just beyond the Romanian city of Orșova, that contains two hydroelectric dams, with two power stations, Iron Gate I Hydroelectric Power Station and Iron Gate II Hydroelectric Power Station. At this point in the Danube, the river separates the southern Carpathian Mountains from the northwestern foothills of the Balkan Mountains. The Romanian side of the gorge constitutes the Iron Gates Natural Park, whereas the Serbian part constitutes the Đerdap National Park. A wider protected area on the Serbian side was declared the UNESCO global geopark in July 2020. Archaeologists have named the Iron Gates mesolithic culture (dated circa 13,000 to 5,000 years ago) after the gorge. One of the most impo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baden-Württemberg
Baden-Württemberg ( ; ), commonly shortened to BW or BaWü, is a states of Germany, German state () in Southwest Germany, east of the Rhine, which forms the southern part of Germany's western border with France. With more than 11.07 million inhabitants across a total area of nearly , it is the third-largest German state by both List of German states by area, area (behind Bavaria and Lower Saxony) and List of German states by population, population (behind North Rhine-Westphalia and Bavaria). The List of cities in Baden-Württemberg by population, largest city in Baden-Württemberg is the state capital of Stuttgart, followed by Mannheim and Karlsruhe. Other major cities are Freiburg im Breisgau, Heidelberg, Heilbronn, Konstanz, Pforzheim, Reutlingen, Tübingen, and Ulm. Modern Baden-Württemberg includes the historical territories of Baden, Prussian Province of Hohenzollern, Hohenzollern, and Württemberg. Baden-Württemberg became a state of West Germany in April 1952 through ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Standard Length
Fish measurement is the measuring of individual fish and various parts of fish anatomy, their anatomies, for data used in many areas of ichthyology, including Taxonomy (biology), taxonomy and fishery biology. Overall length Standard length (SL) is the length of a fish measured from the tip of the snout to the posterior end of the last vertebra or to the posterior end of the midlateral portion of the Glossary of ichthyology#H, hypural plate. This measurement excludes the length of the caudal fin, caudal (tail) fin. Total length (TL) is the length of a fish measured from the tip of the snout to the tip of the longer lobe of the caudal fin, usually measured with the lobes compressed along the midline. It is a straight-line measure, not measured over the curve of the body. Standard length measurements are used with Teleostei (most Actinopterygii, bony fish), while total length measurements are used with Myxini (hagfish), Petromyzontiformes (lampreys) and usually Elasmobranchii (shark ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iris (anatomy)
The iris (: irides or irises) is a thin, annular structure in the eye in most mammals and birds that is responsible for controlling the diameter and size of the pupil, and thus the amount of light reaching the retina. In optical terms, the pupil is the eye's aperture, while the iris is the diaphragm (optics), diaphragm. Eye color is defined by the iris. Etymology The word "iris" is derived from the Greek word for "rainbow", also Iris (mythology), its goddess plus messenger of the gods in the ''Iliad'', because of the many eye color, colours of this eye part. Structure The iris consists of two layers: the front pigmented Wikt:fibrovascular, fibrovascular layer known as a stroma of iris, stroma and, behind the stroma, pigmented epithelial cells. The stroma is connected to a sphincter muscle (sphincter pupillae), which contracts the pupil in a circular motion, and a set of dilator muscles (dilator pupillae), which pull the iris radially to enlarge the pupil, pulling it in folds. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lateral Line
The lateral line, also called the lateral line organ (LLO), is a system of sensory organs found in fish, used to detect movement, vibration, and pressure gradients in the surrounding water. The sensory ability is achieved via modified epithelial cells, known as hair cells, which respond to displacement caused by motion and transduce these signals into electrical impulses via excitatory synapses. Lateral lines play an important role in schooling behavior, predation, and orientation. Early in the evolution of fish, some of the sensory organs of the lateral line were modified to function as the electroreceptors called ampullae of Lorenzini. The lateral line system is ancient and basal to the vertebrate clade, as it is found in fishes that diverged over 400 million years ago. Function The lateral line system allows the detection of movement, vibration, and pressure gradients in the water surrounding an animal. It plays an essential role in orientation, predation, and fish ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
