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Rhithrogena Germanica
''Rhithrogena germanica'' is a European species of mayfly, and is "probably the most famous of all British mayflies", because of its use in fly fishing. It is known in the British Isles as the March brown mayfly, a name which is used in the United States for a different species, ''Rhithrogena morrisoni''. It emerges as a subimago at the end of winter, and can be distinguished from similar species by a dark spot on the femur of each arthropod leg, leg. Description Adults and subimagos of ''Rhithrogena'' species have two long tails, and readily visible hind wings. ''R. germanica'' can only be distinguished from related species such as ''Rhithrogena semicolorata, R. semicolorata'' (the only other ''Rhithrogena'' species in the United Kingdom) by the presence of a dark spot on the femora of the arthropod leg, legs. A similar species, ''Ecdyonurus venosus'' (the ''late March brown'' or ''false March brown'') is more widespread in Great Britain, but emerges later in the year than ''R. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Subimago
Mayflies (also known as shadflies or fishflies in Canada and the upper Midwestern United States, as Canadian soldiers in the American Great Lakes region, and as up-winged flies in the United Kingdom) are aquatic insects belonging to the order Ephemeroptera. This order is part of an ancient group of insects termed the Palaeoptera, which also contains dragonflies and damselflies. Over 3,000 species of mayfly are known worldwide, grouped into over 400 genera in 42 families. Mayflies have ancestral traits that were probably present in the first flying insects, such as long tails and wings that do not fold flat over the abdomen. Their immature stages are aquatic fresh water forms (called "naiads" or "nymphs"), whose presence indicates a clean, unpolluted and highly oxygenated aquatic environment. They are unique among insect orders in having a fully winged terrestrial preadult stage, the subimago, which moults into a sexually mature adult, the imago. Mayflies "hatch" (emerge as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United Kingdom
The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Northwestern Europe, off the coast of European mainland, the continental mainland. It comprises England, Scotland, Wales and Northern Ireland. The UK includes the island of Great Britain, the north-eastern part of the island of Ireland, and most of List of islands of the United Kingdom, the smaller islands within the British Isles, covering . Northern Ireland shares Republic of Ireland–United Kingdom border, a land border with the Republic of Ireland; otherwise, the UK is surrounded by the Atlantic Ocean, the North Sea, the English Channel, the Celtic Sea and the Irish Sea. It maintains sovereignty over the British Overseas Territories, which are located across various oceans and seas globally. The UK had an estimated population of over 68.2 million people in 2023. The capital and largest city of both England and the UK is London. The cities o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sihl
The Sihl is a Switzerland, Swiss river that rises near the Druesberg mountain in the canton of Schwyz, and eventually flows into the Limmat in the centre of the Zürich, city of Zürich, after crossing the Zürich–Winterthur railway at . It has a length of , including the Sihlsee reservoir, through which the river flows. Water is abstracted from the river at the Sihlsee, leading to decreased downstream water flows and a consequent reduction in water quality. The river flows through, or along the border of, the cantons of Canton of Schwyz, Schwyz, Canton of Zürich, Zürich and Canton of Zug, Zug. The main settlements of the Sihl Valley are all in the canton of Zürich, and include the towns of Langnau am Albis and Adliswil, along with a south-western segment of the city of Zürich. Above Langnau am Albis, some from the confluence with the Limmat, there are no major settlements alongside the river, and only a few small villages. Whilst the Einsiedeln, Switzerland, town of Einsied ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Limmat
The Limmat is a river in Switzerland. The river commences at the outfall of Lake Zurich, in the southern part of the city of Zurich. From Zurich it flows in a northwesterly direction, continuing a further 35 km until it reaches the river Aare. The confluence is located north of the small town of Brugg, Aargau, Brugg and shortly after the mouth of the Reuss (river), Reuss. The main towns along the Limmat Valley downstream of Zurich are Dietikon, Wettingen, and Baden, Switzerland, Baden. Its main tributaries are the Linth, Wägitalersee, Wägitaler Aa and Jona (river), Jona, all via Lake Zurich, the Sihl in Zurich, and the Reppisch in Dietikon. The hydronym is first attested in the 8th century, as ''Lindimacus''. It is of Gaulish language, Gaulish origin, from ''*lindo-'' "lake" (Welsh language, Welsh ''llyn'') and ''*magos'' "plain" (Welsh ''maes''), and was thus presumably in origin the name of the plain formed by the Linth. Power generation Like many Swiss rivers, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tributary
A tributary, or an ''affluent'', is a stream or river that flows into a larger stream (''main stem'' or ''"parent"''), river, or a lake. A tributary does not flow directly into a sea or ocean. Tributaries, and the main stem river into which they flow, drain the surrounding drainage basin of its surface water and groundwater, leading the water out into an ocean, another river, or into an endorheic basin. The Irtysh is a chief tributary of the Ob (river), Ob river and is also the longest tributary river in the world with a length of . The Madeira River is the largest tributary river by volume in the world with an average discharge of . A confluence, where two or more bodies of water meet, usually refers to the joining of tributaries. The opposite to a tributary is a distributary, a river or stream that branches off from and flows away from the main stream. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aquatic Sciences
Aquatic means relating to water; living in or near water or taking place in water; does not include groundwater, as "aquatic" implies an environment where plants and animals live. Aquatic(s) may also refer to: * Aquatic animal, either vertebrate or invertebrate, which lives in water for most or all of its life * Aquatic ecosystem, environmental system located in a body of water * Aquatic plants, also called hydrophytic plants or hydrophytes, are plants that have adapted to living in or on aquatic environments * ''Aquatic'' (album), 1994 album by the Australian experimental jazz trio, The Necks * Aquatics, another name for water sports See also * * Aquatics (other) * Freshwater ecosystem, an earth aquatic ecosystems * Limnology, the study of inland waters * Marine biology, the scientific study of organisms in the ocean or other marine or brackish bodies of water * Oceanography Oceanography (), also known as oceanology, sea science, ocean science, and marine science, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Switzerland
Switzerland, officially the Swiss Confederation, is a landlocked country located in west-central Europe. It is bordered by Italy to the south, France to the west, Germany to the north, and Austria and Liechtenstein to the east. Switzerland is geographically divided among the Swiss Plateau, the Swiss Alps, Alps and the Jura Mountains, Jura; the Alps occupy the greater part of the territory, whereas most of the country's Demographics of Switzerland, 9 million people are concentrated on the plateau, which hosts List of cities in Switzerland, its largest cities and economic centres, including Zurich, Geneva, and Lausanne. Switzerland is a federal republic composed of Cantons of Switzerland, 26 cantons, with federal authorities based in Bern. It has four main linguistic and cultural regions: German, French, Italian and Romansh language, Romansh. Although most Swiss are German-speaking, national identity is fairly cohesive, being rooted in a common historical background, shared ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laufenburg, Switzerland
Laufenburg () is a municipality in the Swiss canton of Aargau. It is the seat of the district of the same name. On 1 January 2010 the municipality Sulz merged into Laufenburg. It has approximately 2000 inhabitants. On the other side of the Rhine River lies Laufenburg (Baden), Germany. The same name is not by accident, as the two used to be the same city. In the early 19th century Napoleon divided the city. Two bridges now link both cities. In 1985, Laufenburg received the Wakker Prize for the development and preservation of its architectural heritage. History A high point along the Rhine river with a rapids section about from Säckingen Abbey was chosen as a place for a strategic bridge over the river. The '' Kastvogtei'' (a feudal land holder appointed by the Abbey) transferred his loyalty to the Habsburgs in 1173. Laufenburg is first mentioned in 1207 as ''Loufenberc''. In this 1207 document, the rights of the Abbey to parts of the village were secured while the cas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhine
The Rhine ( ) is one of the List of rivers of Europe, major rivers in Europe. The river begins in the Swiss canton of Graubünden in the southeastern Swiss Alps. It forms part of the Swiss-Liechtenstein border, then part of the Austria–Switzerland border, Swiss-Austrian border. From Lake Constance downstream, it forms part of the Germany-Switzerland border, Swiss-German border. After that the Rhine defines much of the Franco-German border. It then flows in a mostly northerly direction through the German Rhineland. Finally, the Rhine turns to flow predominantly west to enter the Netherlands, eventually emptying into the North Sea. It drains an area of 185,000 km2. Its name derives from the Gaulish language, Gaulish ''Rēnos''. There are two States of Germany, German states named after the river, North Rhine-Westphalia and Rhineland-Palatinate, in addition to several districts of Germany, districts (e.g. Rhein-Sieg-Kreis, Rhein-Sieg). The departments of France, department ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Imago
In biology, the imago (Latin for "image") is the last stage an insect attains during its metamorphosis, its process of growth and development; it is also called the ''imaginal'' stage ("imaginal" being "imago" in adjective form), the stage in which the insect attains maturity. It follows the final ecdysis of the immature instars. In a member of the Ametabola or Hemimetabola, species in which metamorphosis is "incomplete", the final ecdysis follows the last immature or '' nymphal'' stage. In members of the Holometabola, in which there is a pupal stage, the final ecdysis follows emergence from the pupa A pupa (; : pupae) is the life stage of some insects undergoing transformation between immature and mature stages. Insects that go through a pupal stage are holometabolous: they go through four distinct stages in their life cycle, the stages th ..., after which the metamorphosis is complete, although there is a prolonged period of maturation in some species. The imago is the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northern Europe
The northern region of Europe has several definitions. A restrictive definition may describe northern Europe as being roughly north of the southern coast of the Baltic Sea, which is about 54th parallel north, 54°N, or may be based on other geographical factors such as climate and ecology. Climate The climate is mainly Oceanic climate (Cfb), Humid continental climate (Dfb), Subarctic climate (Dfc and Dsc) and Tundra (ET). Geography Northern Europe might be defined roughly to include some or all of the following areas: British Isles, Fennoscandia, the peninsula of Jutland, the Baltic region, Baltic plain that lies to the east, and the many islands that lie offshore from mainland northern Europe and the main European continent. In some cases, Greenland is also included, although it is only politically European, comprising part of the Kingdom of Denmark, and not considered to be geographically in Europe. The area is partly mountainous, including the northern volcanic islands ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Central Europe
Central Europe is a geographical region of Europe between Eastern Europe, Eastern, Southern Europe, Southern, Western Europe, Western and Northern Europe, Northern Europe. Central Europe is known for its cultural diversity; however, countries in this region also share some historical and cultural similarities. The region is variously defined, but it’s minimum definition could be considered of consisting of Austria, Bosnia and Herzegovina, Croatia, the Czech Republic, eastern France, Germany, Liechtenstein, Luxembourg, Poland, Slovakia, Slovenia and Switzerland. But also the Baltic States, the Alsace in north-east France, and South Tyrol, northern Belluno , and Friuli-Venezia Giulia in north-east Italy are culturally usually considered to be part of Central Europe. From the early 16th century until the early 18th century, parts of Croatia and Hungary were ruled by the Ottoman Empire. During the 17th century, the empire also occupied southern parts of present-day Slovakia. During ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
