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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 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 '' R. semicolorata'' (the only other '' Rhithrogena'' species in the United Kingdom) by the presence of a dark spot on the femora of the 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. germanica''. Distribution ''Rhithrogena germanica'' ... [...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 a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ecdyonurus Venosus
''Ecdyonurus'' is a genus of mayflies of the family Heptageniidae. Species These 66 species belong to the genus ''Ecdyonurus'': * '' Ecdyonurus adjaricus'' * '' Ecdyonurus alpinus'' Hefti, Tomka & Zurwerra, 1987 * '' Ecdyonurus androsianus'' Braasch, 1983 * '' Ecdyonurus angelieri'' Thomas, 1968 * '' Ecdyonurus asiaeminoris'' Demoulin, 1973 * '' Ecdyonurus aurantiacus'' (Burmeister, 1839) * '' Ecdyonurus austriacus'' Kimmins, 1958 * '' Ecdyonurus autumnalis'' Braasch, 1980 * '' Ecdyonurus baeticus'' Alba-Tercedor & Derka, 2004 * '' Ecdyonurus bajkovae'' Kluge, 1986 * '' Ecdyonurus belfiorei'' Haybach & Thomas, 2000 * '' Ecdyonurus bellieri'' (Hagen, 1860) * '' Ecdyonurus bellus'' (Allen and Cohen, 1977) * '' Ecdyonurus bimaculatus'' Tanatmis & Haybach, 2010 * '' Ecdyonurus carpathicus'' Sowa, 1973 * '' Ecdyonurus codinai'' Navás, 1924 * '' Ecdyonurus corsicus'' Esben-Petersen, 1912 * '' Ecdyonurus cortensis'' Belfiore, 1987 * '' Ecdyonurus criddlei'' (McDunnough, 1927) (little s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Töss (river)
The Töss is a river of the canton of Zürich. It starts with the confluence of the Vordertöss and the Hindertöss in the Zürcher Oberland, at ''Tössscheidi'' on on the border between the municipalities of Wald west of the Dägelschberg (), east of the Hüttchopf (), and north of the Tössstock ()). The Vordertöss (lit.: 'Front Töss') rises on the south side of the Tössstock on the north faces of the Schwarzeberg () and Höchhand () before it circumvent the Tössstock on its western flank. The larger tributary, the Hindertöss (lit.: 'Back Töss') collects the waters, either, by its tributary, the ''Chreuelbach'', below the Höchhand, the western faces of the Habrütispitz () and Rossegg (), or, from its own sources below Schindelegg (), and the south faces of Schindelberghöchi () and the Dägelschberg, and passes the Tössstock on its northern hillside. The Töss flows to the north before it meets the main valley of its own name, Töss Valley (''Tösstal'') j ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thur (Switzerland)
Thur is a river in north-eastern Switzerland. Its source is near the mountain Säntis in the south-east of the canton of St. Gallen. In this canton it flows through the Toggenburg region and the town Wil. After Wil it flows through the canton of Thurgau and its capital Frauenfeld. The final of the Thur are in the canton of Zürich. It flows into the river Rhine on the border with Germany, south of Schaffhausen Schaffhausen (; gsw, Schafuuse; french: Schaffhouse; it, Sciaffusa; rm, Schaffusa; en, Shaffhouse) is a town with historic roots, a municipality in northern Switzerland, and the capital of the canton of the same name; it has an estimate .... Rivers of Switzerland Rivers of the canton of St. Gallen {{Switzerland-river-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sihl
The Sihl is a Swiss river that rises near the Druesberg mountain in the canton of Schwyz, and eventually flows into the Limmat in the centre of the city of Zürich. 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 Schwyz, Zürich and 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 town of Einsiedeln is situated close to the Sihlsee, it is actually in the valley of a tributary river, the Alp. Etymology The first written reference to the n ... [...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, after 35 km reaching the river Aare. The confluence is located north of the small town of Brugg and shortly after the mouth of the Reuss. The main towns along the Limmat Valley downstream of Zurich are Dietikon, Wettingen, and Baden. Its main tributaries are the Linth, 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 origin, from ''*lindo-'' "lake" (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 Limmat is intensively used for production of hydroelectric power: along its course of , its fall is used by no less than ten hydroelectric power sta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tributary
A tributary, or affluent, is a stream or river that flows into a larger stream or 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 drain the surrounding drainage basin of its surface water and groundwater, leading the water out into an ocean. The Irtysh is a chief tributary of the 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. PhysicalGeography.net, Michael Pidwir ... [...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 Limnology ( ; from Greek λίμνη, ''limne'', "lake" and λόγος, ''logos'', "knowledge") is the study of inland aquatic ecosystems. The study of limnology includes aspects of the biological, chemical, physical, and geological charact ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Switzerland
). Swiss law does not designate a ''capital'' as such, but the federal parliament and government are installed in Bern, while other federal institutions, such as the federal courts, are in other cities (Bellinzona, Lausanne, Luzern, Neuchâtel, St. Gallen a.o.). , coordinates = , largest_city = Zürich , official_languages = , englishmotto = "One for all, all for one" , religion_year = 2020 , religion_ref = , religion = , demonym = , german: Schweizer/Schweizerin, french: Suisse/Suissesse, it, svizzero/svizzera or , rm, Svizzer/Svizra , government_type = Federal assembly-independent directorial republic with elements of a direct democracy , leader_title1 = Federal Council , leader_name1 = , leader_title2 = , leader_name2 = Walter Thurnherr , legislature = Federal Assembly , upper_house = Council of ... [...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 c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhine
), Surselva, Graubünden, Switzerland , source1_coordinates= , source1_elevation = , source2 = Rein Posteriur/Hinterrhein , source2_location = Paradies Glacier, Graubünden, Switzerland , source2_coordinates= , source2_elevation = , source_confluence = Reichenau , source_confluence_location = Tamins, Graubünden, Switzerland , source_confluence_coordinates= , source_confluence_elevation = , mouth = North Sea , mouth_location = Netherlands , mouth_coordinates = , mouth_elevation = , progression = , river_system = , basin_size = , tributaries_left = , tributaries_right = , custom_label = , custom_data = , extra = The Rhine ; french: Rhin ; nl, Rijn ; wa, Rén ; li, Rien; rm, label= Sursilvan, Rein, rm, label= Sutsilvan and Surmiran, Ragn, rm, label=Rumantsch Grischun, Vallader and Puter, Rain; it, Reno ; gsw, Rhi(n), inclu ... [...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, the stage in which the insect attains maturity. It follows the final ecdysis of the immature instars.Carpenter, Geo. H., The Life-Story of Insects. Cambridge University Press 1913. May be downloaded from: https://www.gutenberg.org/ebooks/16410 or https://archive.org/details/thelifestoryofin16410gut In a member of the Ametabola or Hemimetabola, 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, after which the metamorphosis is complete, although there is a prolonged period of maturation in some species. The imago is the only stage during which the insect is sexually mature and, if it is a winged species, has functional wings. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
