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Trehörningen (Sjödalen)
Trehörningen ( Swedish: "The Triangle"''Trehörningen'' literary translates to "The Three-Corner", a name most likely referring to the three "bays" of the laks.) is a small lake located in the municipality Huddinge in southern Stockholm, Sweden. As part of the Tyresån Lake System, Trehörningen receives water from Lake Gömmaren and supplies water to Lake Ågesta. History The area surrounding Trehörningen, Orlången and Ågestasjön, is a fine example of a historical landscape evolving from a prehistoric settlement into a traditional agricultural village discontinued in the 19th century, encompassing structures from all interjacent eras. It is one of the few areas in Stockholm which escaped the creation of the widespread 20th century suburbs around the historical city of Stockholm, and, consequently, the area is considered as having cultural and historical values of national interest. The landscape include open cultivated and grazed fields next to steep rocks, pine and de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Huddinge
Huddinge Municipality () is a municipalities of Sweden, municipality in Stockholm County, east central Sweden. Its seat is located in Huddinge (), which is a part of Stockholm urban area. The municipality is, with its approximately 110,000 inhabitants, the second most populated in Stockholm County. Geography The municipality covers the entire central part of the Södertörn peninsula. More than half of the land area consists of agriculture, forests, hills, or lakes, and it contains 13 nature reserves. Huddinge borders the following municipalities: Stockholm Municipality, Ekerö Municipality (by water), Botkyrka Municipality, Haninge Municipality and Tyresö Municipality (by water). Localities *Stockholm urban area (part of) 86,802 inh. *Vidja 633 inh. *Rural areas 2,465 inh. Subdivisions Huddinge municipality is sub-divided into six districts: * Flemingsberg (pop. 14,924) * Segeltorp (pop. 11,870) * Sjödalen-Fullersta (pop. 22,304) * Skogås (pop. 13,783) * Stuvsta-Snättring ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ardea (genus)
''Ardea'' is a genus of herons. These herons are generally large in size, typically 80–100 cm or more in length. These large herons are associated with wetlands where they prey on fish, frogs, and other aquatic species. Most members of this almost worldwide group breed colonially in trees, building large stick nests. Northern species such as great blue, grey, and purple herons may migrate south in winter, although the first two do so only from areas where the waters freeze. Description These are powerful birds with large spear-like bills, long necks and long legs, which hunt by waiting motionless or stalking their prey in shallow water before seizing it with a sudden lunge. They have a slow steady flight, with the neck retracted as is characteristic of herons and bitterns; this distinguishes them from storks, cranes, flamingos, and spoonbills, which extend their necks. Taxonomy The genus ''Ardea'' was introduced in 1758 by the Swedish naturalist Carl Linnaeus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Common Gull
The common gull (''Larus canus'') is a medium-sized gull that breeds in cool temperate regions of the Palearctic from Iceland and Scotland east to Kamchatka in the Russian Far East. Most common gulls bird migration, migrate further south in winter, reaching the Mediterranean Sea, the southern Caspian Sea, and the seas around China and Japan; northwest European populations are at least partly resident. The closely related short-billed gull was formerly often included in this species, which was then sometimes known collectively as "mew gull". Taxonomy The common gull was Species description, formally described in 1758 by the Swedish naturalist Carl Linnaeus in the 10th edition of Systema Naturae, tenth edition of his ''Systema Naturae'' under the current binomial nomenclature, binomial name ''Larus canus''. Linnaeus specified the type location (biology), type locality as Europe but this is now restricted to Sweden. The genus name is a Latin word for a seabird, probably a gull. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Common Goldeneye
The common goldeneye or simply goldeneye (''Bucephala clangula'') is a medium-sized sea duck of the genus ''Goldeneye (duck), Bucephala'', the goldeneyes. Its closest relative is the similar Barrow's goldeneye. The genus name is derived from the Ancient Greek ''boukephalos'' ("bullheaded", from ''bous'', "bull " and ''kephale'', "head"), a reference to the bulbous head shape of the bufflehead. The species name is derived from the Latin ''clangere'' ("to resound"). Common goldeneyes are aggressive and territorial ducks, and have elaborate courtship displays. Taxonomy The common goldeneye was Species description, formally described in 1758 by the Swedish naturalist Carl Linnaeus in the 10th edition of Systema Naturae, tenth edition of his ''Systema Naturae'' under the binomial nomenclature, binomial name ''Anas clangula''. Linnaeus specified the type location (biology), type location as Europe but in 1761 restricted this to Sweden. The common goldeneye is now one of three species ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Great Crested Grebe
The great crested grebe (''Podiceps cristatus'') is a member of the grebe family of water birds. The bird is characterised by its distinctive appearance, featuring striking black, orange-brown, and white plumage, and elaborate courtship display that involves synchronised dances and displays. Taxonomy The great crested grebe was formally described by the Swedish naturalist Carl Linnaeus in 1758 in the tenth edition of his ''Systema Naturae'' under the binomial name ''Colymbus cristatus''. It is now the type species of the genus '' Podiceps'' that was erected by the English naturalist John Latham in 1787. The type locality is Sweden. The scientific name comes from Latin: the genus name ''Podiceps'' is from , "vent" and , "foot", and is a reference to the placement of a grebe's legs towards the rear of its body; the specific name, ''cristatus'', means "crested". Subspecies Three subspecies are currently accepted: Description The great crested grebe is the largest speci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eurasian Coot
The Eurasian coot (''Fulica atra''), also known as the common coot, or Australian coot, is a member of the rail and crake bird family, the Rallidae. It is found in Europe, Asia, Australia, New Zealand and parts of North Africa. It has a slaty-black body, a glossy black head and a white bill with a white frontal shield. The sexes are similar. Similar looking coot species are found throughout the world, with the largest variety of coot species living in South America. Taxonomy The Eurasian coot was formally described by the Swedish naturalist Carl Linnaeus in 1758 in the tenth edition of his ''Systema Naturae'' under its current binomial name ''Fulica atra''. Linnaeus specified the locality as Europe but this is now restricted to Sweden. The binomial name is from Latin: ''Fulica'' means 'coot', and ''atra'' means 'black'. Four subspecies are recognised: * ''F. a. atra'' Linnaeus, 1758 – Europe and north Africa to Japan, India, southeast Asia, Philippines and Borneo * ''F. a. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mallard
The mallard () or wild duck (''Anas platyrhynchos'') is a dabbling duck that breeds throughout the temperate and subtropical Americas, Eurasia, and North Africa. It has been introduced to New Zealand, Australia, Peru, Brazil, Uruguay, Argentina, Chile, Colombia, the Falkland Islands, and South Africa. Belonging to the subfamily Anatinae of the waterfowl family Anatidae, mallards live in wetlands, eat water plants and small animals, and are social animals preferring to congregate in groups or flocks of varying sizes. Males (drakes) have green heads, while the females (hens) have mainly brown-speckled plumage. Both sexes have an area of white-bordered black or iridescent purple or blue feathers called a speculum on their wings; males especially tend to have blue speculum feathers. The mallard is long, of which the body makes up around two-thirds the length. The wingspan is and the bill is long. It is often slightly heavier than most other dabbling ducks, weighing . T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Black-headed Gull
The black-headed gull (''Chroicocephalus ridibundus'') is a small gull that breeds in much of the Palearctic in Europe and Asia, and also locally in smaller numbers in coastal eastern Canada. Most of the population is migratory and winters further south, but many also remain in the milder areas of northwestern Europe. It was formerly sometimes cited as "common black-headed gull" to distinguish it from "great black-headed gull" (an old name for Pallas's gull). The genus name ''Chroicocephalus'' is from the Ancient Greek words ''khroizo'', "to colour", and ''kephale'', "head". The specific name ''ridibundus'' is Latin for "laughing". Taxonomy The black-headed gull was formally described in 1766 by the Swedish naturalist Carl Linnaeus in the twelfth edition of his ''Systema Naturae''. He placed it with the other gulls in the genus ''Larus'' and coined the binomial name ''Larus ridibundus''. Linnaeus specified the locality as ''Mari Europaeo'' or European seas. Genetic stud ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reed Bed
A reedbed or reed bed is a natural habitat found in floodplains, waterlogged depressions and estuaries. Reedbeds are part of a succession from young reeds colonising open water or wet ground through a gradation of increasingly dry ground. As reedbeds age, they build up a considerable litter layer that eventually rises above the water level and that ultimately provides opportunities in the form of new areas for larger terrestrial plants such as shrubs and trees to colonise. Artificial reedbeds are used to remove pollutants from greywater, and are also called constructed wetlands. Types Reedbeds vary in the species that they can support, depending upon water levels within the wetland system, climate, seasonal variations, and the nutrient status and salinity of the water. ''Reed swamps'' have 20 cm or more of surface water during the summer and often have high invertebrate and bird species use. ''Reed fens'' have water levels at or below the surface during the summer and are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Algae Bloom
An algal bloom or algae bloom is a rapid increase or accumulation in the population of algae in fresh water or marine water systems. It is often recognized by the discoloration in the water from the algae's pigments. The term ''algae'' encompasses many types of aquatic photosynthetic organisms, both macroscopic multicellular organisms like seaweed and microscopic unicellular organisms like cyanobacteria. ''Algal bloom'' commonly refers to the rapid growth of microscopic unicellular algae, not macroscopic algae. An example of a macroscopic algal bloom is a kelp forest. Algal blooms are the result of a nutrient, like nitrogen or phosphorus from various sources (for example fertilizer runoff or other forms of nutrient pollution), entering the aquatic system and causing excessive growth of algae. An algal bloom affects the whole ecosystem. Consequences range from benign effects, such as feeding of higher trophic levels, to more harmful effects like blocking sunlight from reaching o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phosphorus
Phosphorus is a chemical element; it has Chemical symbol, symbol P and atomic number 15. All elemental forms of phosphorus are highly Reactivity (chemistry), reactive and are therefore never found in nature. They can nevertheless be prepared artificially, the two most common allotropes being white phosphorus and red phosphorus. With as its only stable isotope, phosphorus has an occurrence in Earth's crust of about 0.1%, generally as phosphate rock. A member of the pnictogen family, phosphorus readily forms a wide variety of organic compound, organic and inorganic compound, inorganic compounds, with as its main oxidation states +5, +3 and −3. The isolation of white phosphorus in 1669 by Hennig Brand marked the scientific community's first discovery since Antiquity of an element. The name phosphorus is a reference to the Phosphorus (morning star), god of the Morning star in Greek mythology, inspired by the faint glow of white phosphorus when exposed to oxygen. This property is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
