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Auesee
Auesee is an artificial bathing lake in Wesel, North Rhine-Westphalia, Germany, about northwest from the state capital of Düsseldorf. A popular recreation spot, it has been referred to as the "jewel" of Wesel. Auesee was built from one of the largest gravel excavation sites in North Rhine-Westphalia. Terrain The lake has a surface area of . Within the lake there are distinct areas of shallow water with depths up to , while its deepest point is . The main lake basin is stable, and the banks are fixed. A peninsula stretching into the lake from the southeast divides the waters into a north-east and a south-west basin, both of which are connected to the north basin. As an artificial lake, Auesee has no inflow or outflow, and is fed exclusively by groundwater. History The formation of Auesee was initiated as a partnership between the municipality of Wesel and the excavating company Hülskens & Co. Negotiations began in 1959, and resulted in an agreement that the company would rem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wesel
Wesel () is a city in North Rhine-Westphalia, Germany. It is the capital of the Wesel district. Geography Wesel is situated at the confluence of the Lippe River and the Rhine. Division of the city Suburbs of Wesel include Lackhausen, Obrighoven, Ginderich, Feldmark, Fusternberg, Büderich, Flüren and Blumenkamp. History Origin The city originated from a Franconian manor that was first recorded in the 8th century. In the 12th century, the Duke of Clèves took possession of Wesel. The city became a member of the Hanseatic League during the 15th century. Wesel was second only to Cologne in the lower Rhine region as an entrepôt. It was an important commercial centre: a clearing station for the transshipment and trading of goods. Early modern In 1590 the Spanish captured Wesel after a four-year siege. The city changed hands between the Dutch and Spanish several times during the Eighty Years War. In 1672 a French force under Louis II de Bourbon, Prince de Condé capture ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North Rhine-Westphalia
North Rhine-Westphalia (german: Nordrhein-Westfalen, ; li, Noordrien-Wesfale ; nds, Noordrhien-Westfalen; ksh, Noodrhing-Wäßßfaale), commonly shortened to NRW (), is a state (''Land'') in Western Germany. With more than 18 million inhabitants, it is the most populous state of Germany. Apart from the city-states, it is also the most densely populated state in Germany. Covering an area of , it is the fourth-largest German state by size. North Rhine-Westphalia features 30 of the 81 German municipalities with over 100,000 inhabitants, including Cologne (over 1 million), the state capital Düsseldorf, Dortmund and Essen (all about 600,000 inhabitants) and other cities predominantly located in the Rhine-Ruhr metropolitan area, the largest urban area in Germany and the fourth-largest on the European continent. The location of the Rhine-Ruhr at the heart of the European Blue Banana makes it well connected to other major European cities and metropolitan areas like the R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Potamogeton Perfoliatus
''Potamogeton perfoliatus'' (claspingleaf pondweed, perfoliate pondweed, redhead grass) is a perennial aquatic plant in the family Potamogetonaceae occurring in both standing and flowing freshwater habitats. It is widely distributed globally, occurring in all continents except South America and Antarctica. Description Perfoliate pondweed grows from a robust creeping perennial rhizome, intermittently producing round stems up to 3 m long. The submerged leaves are oval and translucent, with no stalk, 20–115 mm long and 7–42 mm wide, clasping the stem (perfoliate), a flat apex, and 5-12 veins on either side of the midrib. They vary considerably in colour and may be bright green, dark green, yellowish, olive or brownish. There are no floating leaves. The stipules are rather delicate and usually fall off quite soon after the new leaf has unfurled. The insignificant flowers are produced between June and September. Fruits are 4 mm across, olive green in colour. Two s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tench
The tench or doctor fish (''Tinca tinca'') is a fresh- and brackish-water fish of the order Cypriniformes found throughout Eurasia from Western Europe including the British Isles east into Asia as far as the Ob and Yenisei Rivers. It is also found in Lake Baikal. It normally inhabits slow-moving freshwater habitats, particularly lakes and lowland rivers.B. Whitton (1982). ''Rivers, Lakes and Marshes'' p 163. Hodder & Staughton, London. Taxonomy The tench was formerly classified in the subfamily Leuciscinae with other Eurasian minnows, but more recent phylogenetic studies have supported it belonging to its own family Tincidae. Ecology The tench is most often found in still waters with a clay or muddy substrate and abundant vegetation.A. F. Magri MacMahon (1946). ''Fishlore'', pp 156-158. Pelican Books. This species is rare in clear waters across stony substrate, and is absent altogether from fast-flowing streams. It tolerates water with a low oxygen concentration, being ... [...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] |
Sander (genus)
''Sander'' (formerly known as ''Stizostedion'') is a genus of predatory ray-finned fish in the Family (biology), family Percidae, which also includes the perches, Gymnocephalus, ruffes, and Darter (fish), darters. They are also known as "pike-perch" because of their resemblance to fish in the unrelated Esocidae (pike) family. They are the only genus in the Monotypy, monotypic Tribe (biology), tribe Luciopercini, which is one of two tribes in the subfamily Luciopercinae, Characteristics ''Sander'' species have elongated and laterally compressed bodies and they range in fish measurement, total length from in the Volga pikeperch (''S. volgensis'') to in the zander (''S. lucioperca''). The species within the genus share canine-like teeth that are at their largest in the zander, and although they are not present in adult Volga pikeperches, they do possess them as juveniles. in addition, they have thin rows of teeth on their jaws, vomer, and palatines, the preopercle shows strong ser ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Esox
''Esox'' is a genus of freshwater fish commonly known as pike or pickerel. It is the type genus of the family Esocidae. The type species of the genus is '' Esox lucius'', the northern pike. ''Esox'' has been present in Laurentia (which later became North America) and Eurasia since the Paleocene. Modern large pike species are native to the Palearctic and Nearctic realms, ranging across Northern America and from Western Europe to Siberia in North Asia. Pikes have the elongated, torpedo-like shape typical of predatory fishes, with sharply pointed heads and sharp teeth. Their coloration is typically grey-green with a mottled or spotted appearance with stripes along their backs, providing camouflage among underwater weeds, and each individual pike marking patterns are unique like fingerprints. Pikes can grow to a maximum recorded length of , reaching a maximum recorded weight of . Etymology The generic name ''Esox'' (pike fish) derives from the Greek ἴσοξ (''ee-so ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carp
Carp are various species of oily freshwater fish from the family Cyprinidae, a very large group of fish native to Europe and Asia. While carp is consumed in many parts of the world, they are generally considered an invasive species in parts of Africa, Australia and most of the United States. Biology The cypriniformes (family Cyprinidae) are traditionally grouped with the Characiformes, Siluriformes, and Gymnotiformes to create the superorder Ostariophysi, since these groups share some common features. These features include being found predominantly in fresh water and possessing Weberian ossicles, an anatomical structure derived from the first five anterior-most vertebrae, and their corresponding ribs and neural crests. The third anterior-most pair of ribs is in contact with the extension of the labyrinth and the posterior with the swim bladder. The function is poorly understood, but this structure is presumed to take part in the transmission of vibrations from the s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cyclotella
''Cyclotella'' is a genus of diatoms often found in oligotrophic environments, both marine and fresh water. It is in the family Stephanodiscaceae and the order Thalassiosirales. The genus was first discovered in the mid 1800s and since then has become an umbrella genus for nearly 100 different species, the most well-studied and the best known being '' Cyclotella meneghiniana''. Despite being among the most dominant genera in low-productivity environments, it is relatively understudied.Saros, J.E., Anderson, N.J. (2015). The ecology of the planktonic diatom Cyclotella and its implications for global environmental change studies. Biol Rev Camb Philos Soc. 90(2). 522-41. ''Cyclotellas habitat has traditionally been described as low-productivity mesotrophic or oligotrophic freshwater environments, but with ''C. meneghiniana'' appearing in warm, nutrient-rich environments as well as low-productivity environments, it has become unclear whether there is an archetypal aquatic setting ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gymnodinium Helveticum
''Gymnodinium'' is a genus of dinoflagellates, a type of marine and freshwater plankton. It is one of the few naked dinoflagellates, or species lacking armor known as cellulosic plates. Since 2000, the species which had been considered to be part of ''Gymnodinium'' have been divided into several genera, based on the nature of the apical groove and partial LSU rDNA sequence data. Amphidinium was redefined later. Gymnodinium belong to red dinoflagellates that, in concentration, can cause red tides. The red tides produced by some Gymnodinium, such as Gymnodinium catenatum, are toxic and pose risks to marine and human life, including paralytic shellfish poisoning. Species * ''Amphidinium'' * ''Aureolum'' *''Gymnodinium'' sensu stricto * ''Gyrodinium'' *''Akashiwo'' *'' Karenia'' *''Karlodinium'' *''Katodinium'' *'' Takayama'' Former species ''Torodinium'' (with ''Torodinium robustum'' and the type species In zoological nomenclature, a type species (''species typica'') is the sp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhodomonas Minuta
''Rhodomonas'' is a genus of cryptomonads. It is characterized by its red colour, the square-shaped plates of its inner periplast, its short furrow ending in a gullet, and a distinctly shaped chloroplast closely associated with its nucleomorph. Historically, ''Rhodomonas'' was characterized by its red chloroplast alone, but this no longer occurs as its taxonomy has become increasingly based on molecular and cellular data. Currently, there is some debate about the taxonomic validity of ''Rhodomonas'' as a genus and further research is needed to verify its taxonomic status. ''Rhodomonas'' is typically found in marine environments, although freshwater reports exist. It is commonly used as a live feed for various aquaculture species. History of Knowledge Discovery ''Rhodomonas'' was first described by G. Karsten in 1898 as a “strange, swimming organism”. The first indication of ''Rhodomonas’'' existence was Karsten's observation of its proliferation in a sample containing di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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