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Forsån
Forsån ( Swedish: "Rapids' Stream") is a stream in southern Stockholm, Sweden. It is also known as Stortorpsån and Forsen. Leaving lake Magelungen calmly by a small sandy beach, Forsån's upper reach passes through a furrow blown in the 1860s to lower the level of the lake resulting in the present wide torrents passing through the bedrock. In contrast, the last 500 metres of the course are characterized by flat shores and stagnant, overgrown waters. The stream has a vigorous population of signal crayfish and is the only winter habitat in Stockholm for white-throated dipper.Forsån Catchment area Approximately half of the catchment area is occupied by contaminated ground and polluting operations in the Larsboda industrial area; with the remaining area composed of parks and green spaces. One of the minor allotment-garden's is located in an area which is crossed by two major traffic routes and a railway.Vattenprogram, p 30.2 Environmental influence The inflow from Magelun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rivers Of Sweden ...
This is a list of the rivers of Sweden. Baltic Sea From south to north * Helgeå * Ljungbyån * Ronnebyån *Motala ström with Svartån Bothnian Sea *Dalälven * Ljusnan *Ljungan *Indalsälven * Ångermanälven * Ume älv Bothnian Bay * Skellefte älv * Pite älv *Lule älv * Kalix älv * Torne älv Kattegat * Lagan *Nissan * Ätran *Viskan *Göta älv - Klarälven (via Lake Vänern) A-Z A-Z of Swedish rivers. The lengths in kilometers are also given: See also *Baltic Sea *Kattegat *Islands of Sweden *Geography of Sweden References {{List of rivers of Europe * Sweden Rivers A river is a natural stream of fresh water that flows on land or inside caves towards another body of water at a lower elevation, such as an ocean, lake, or another river. A river may run dry before reaching the end of its course if it ru ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magelungen
Magelungen () is one of the biggest lakes in Stockholm, Sweden, located between the municipalities of Stockholm and Huddinge. It is considered as of great recreational value and is popular for bathing, yachting, and fishing in summers, and tour skating in winters. The lake borders two nature reserves: Fagersjöskogen/ Farstanäset and Rågsved Open-Air Area. Catchment area Less than half of the catchment area is composed of forest and open grasslands. Some 10 per cent is wetlands and parks, and the remaining area is covered by one-family houses and blocks of flats. Two bridges cross the lake; several major roads pass through the catchment area, as do the above ground tracks of the metro and suburban railway. South of the lake is a larger continuous forest, a golf course, and an open-air centre. Besides the nature reserve, areas on the northern side are used for riding and Allotment-gardens.Vattenprogram, p 9.3-9.4 The primary catchment area is relatively small and compo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Drevviken
Drevviken is a lake in southern Stockholm, Sweden, shared by the four municipalities Stockholm, Haninge, Huddinge, and Tyresö. While much of the surrounding area is used for one-family houses, the lake and the green space north of it are considered to be of great recreational and natural importance and forms part of a suggested nature reserve around lake Flaten.Drevviken Catchment area Approximately two-thirds of the catchment area is occupied by settlements, mostly one-family houses. Three major industrial areas are located within the catchment area which is mostly dominated by forests with minor open grasslands. North of the lake is a deciduous forest containing herbaceous plants and rocks covered with brushwoods and lichen. Additionally, there is a fluvio-glacial deposit with a broad irrigated marsh and a scenic pine forest; and a wetland which is the remnant of a former stream.Vattenprogram, p 10.3-10.6 Environmental influence Stormwater from several suburbs empti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geography Of Stockholm
The City of Stockholm is situated on fourteen islands and on the banks to the archipelago where Lake Mälaren meets the Baltic Sea. The city centre is virtually situated on the water. The area of Stockholm is one of several places in Sweden with a joint valley terrain. In these landscapes erosion along geological joints has split the flattish upper surfaces into low-lying plateaus. In the case of Stockholm the plateau surfaces are remnants of the Sub-Cambrian peneplain. Islands and islets Extant islands and islets Historical islands and islets References: Dufwa, ''Stockholms tekniska historia'', pp 49-50, 149-150 Lakes and watercourses The access to fresh water is excellent in Stockholm today. Historically, lakes and watercourses were used as refuse dumps and latrines, causing epidemic cholera and many other diseases. By the 1860s water was being drawn from Årstaviken, the waters south of Södermalm, and was treated in the first water-purifying plant at Skanstul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hippeutis Complanatus
''Hippeutis'' is a genus of minute air-breathing freshwater snails, aquatic pulmonate gastropod mollusks or micromollusks in the family Planorbidae, the ramshorn snails. Albrecht et al. (2007)Albrecht C., Kuhn K. & Streit B. (2007). "A molecular phylogeny of Planorboidea (Gastropoda, Pulmonata): insights from enhanced taxon sampling". ''Zoologica Scripta ''Zoologica Scripta'' is a bimonthly peer-reviewed scientific journal on systematic zoology, published by Wiley-Blackwell on behalf of the Norwegian Academy of Science and Letters and the Royal Swedish Academy of Sciences. It was established in 197 ...'' 36: 27-39. . have confirmed its placement in the tribe Segmentinini within subfamily Planorbinae. Species Species within the genus ''Hippeutis'' include: *'' Hippeutis acuticarinatus'' *'' Hippeutis ambiguus'' *'' Hippeutis badae'' *'' Hippeutis bajandaicus'' *'' Hippeutis bureaui'' *'' Hippeutis cantori'' *???'' Hippeutis carntori'' *'' Hippeutis chertieri'' *'' Hip ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beaver
Beavers (genus ''Castor'') are large, semiaquatic rodents of the Northern Hemisphere. There are two existing species: the North American beaver (''Castor canadensis'') and the Eurasian beaver (''C. fiber''). Beavers are the second-largest living rodents, after capybaras, weighing up to . They have stout bodies with large heads, long chisel-like incisors, brown or gray fur, hand-like front feet, webbed back feet, and tails that are flat and scaly. The two species differ in skull and tail shape and fur color. Beavers can be found in a number of freshwater habitats, such as rivers, streams, lakes and ponds. They are herbivorous, consuming tree bark, aquatic plants, grasses and sedges. Beavers build dams and lodges using tree branches, vegetation, rocks and mud; they chew down trees for building material. Dams restrict water flow, forming ponds, and lodges (usually built in ponds) serve as shelters. Their infrastructure creates wetlands used by many other species, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Common Kingfisher
The common kingfisher (''Alcedo atthis''), also known as the Eurasian kingfisher and river kingfisher, is a small kingfisher with seven subspecies recognized within its wide distribution across Eurasia and North Africa. It is resident in much of its range, but migrates from areas where rivers freeze in winter. This sparrow-sized bird has the typical short-tailed, large-headed kingfisher profile; it has blue upperparts, orange underparts and a long bill. It feeds mainly on fish, caught by diving, and has special visual adaptations to enable it to see prey under water. The glossy white eggs are laid in a nest at the end of a burrow in a riverbank. Taxonomy The common kingfisher was first described by Carl Linnaeus in the 10th edition of his ''Systema Naturae'' in 1758 as ''Gracula atthis''. The modern binomial name derives from the Latin ', 'kingfisher' (from Greek , '), and ''Atthis'', a beautiful young woman of Lesbos, and favourite of Sappho. The genus '' Alcedo'' compri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
White Water
Whitewater forms in the context of rapids, in particular, when a river's gradient changes enough to generate so much turbulence that air is trapped within the water. This forms an unstable current that froths, making the water appear opaque and white. The term "whitewater" also has a broader meaning, applying to any river or creek that has a significant number of rapids. The term is also used as an adjective describing boating on such rivers, such as whitewater canoeing or whitewater kayaking. Fast rivers Four factors, separately or in combination, can create rapids: gradient, constriction, obstruction, and flow rate. Gradient, constriction, and obstruction are streambed topography factors and are relatively consistent. Flow rate is dependent upon both seasonal variation in precipitation and snowmelt and upon release rates of upstream dams. Streambed topography Streambed topography is the primary factor in creating rapids, and is generally consistent over time. Increa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rutilus
''Rutilus'', commonly known as roaches, is a genus of freshwater ray-finned fish belonging to the family Leuciscidae, which includes the daces, Eurasian minnows and related fishes. This genus is a widely distributed lineage of leuciscids and ranges from West Europe to East Siberia. Taxonomy ''Rutilus'' was first proposed as a genus in 1820 by the French polymath Constantine Samuel Rafinesque with ''Cyprinus rutilus'' designated as the type species but also the type species by absolute tautonymy. ''Cyprinus rutilus'' was first formally described in the 10th edition of ''Systema Naturae'' by Carl Linnaeus with "European lakes" given as the type locality. In a phylogeographic study, Levin et al. (2017) argue that the Ponto-Caspian taxa including ''R. caspicus'', ''R. heckelii'' and ''R. stoumboudae'' could represent a single widespread species whose range extends to Siberia, to be named ''Rutilus lacustris'', whereas ''R. kutum'' is included in ''R. frisii''. Levin, B.A. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trout
Trout (: trout) is a generic common name for numerous species of carnivorous freshwater ray-finned fishes belonging to the genera '' Oncorhynchus'', ''Salmo'' and ''Salvelinus'', all of which are members of the subfamily Salmoninae in the family Salmonidae. The word ''trout'' is also used for some similar-shaped but non-salmonid fish, such as the spotted seatrout/speckled trout (''Cynoscion nebulosus'', which is actually a croaker). Trout are closely related to salmon and have similar migratory life cycles. Most trout are strictly potamodromous, spending their entire lives exclusively in freshwater lakes, rivers and wetlands and migrating upstream to spawn in the shallow gravel beds of smaller headwater creeks. The hatched fry and juvenile trout, known as ''alevin'' and ''parr'', will stay upstream growing for years before migrating down to larger waterbodies as maturing adults. There are some anadromous species of trout, such as the steelhead (a coastal subs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Signal Crayfish
The signal crayfish (''Pacifastacus leniusculus'') is a species of crayfish indigenous to North America. Introduced to Europe in the 1960s to supplement the North European ''Astacus astacus'' fisheries, which were being damaged by crayfish plague, it was subsequently discovered that the signal was itself a carrier of that disease. Consequently, the signal crayfish is now considered an invasive species across Europe, Japan, and California, having displaced the native species in these regions. Description and ecology Members of this species are typically long, although sizes up to are possible. A distinctive white to pale blue-green patch is present near the claw hinge, reminiscent of the white flags that signalmen used for directing trains—hence the species' common name. The Biological life cycle, lifecycle of the signal crayfish is typical for the family Astacidae. The mating season occurs in the autumn, during which time the female produces around 200 to 400 egg (biolog ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blue-tailed Damselfly
The blue-tailed damselfly or common bluetail (''Ischnura elegans'') is a damselfly, belonging to the family Coenagrionidae. Subspecies and varieties Subspecies and varieties include: *''Ischnura elegans ebneri'' Schmidt, 1938 *''Ischnura elegans elegans'' (Vander Linden, 1820) *''Ischnura elegans pontica'' Schmidt, 1939 *''Ischnura elegans f. infuscans'' *''Ischnura elegans f. infuscans-obsoleta'' *''Ischnura elegans f. rufescens'' *''Ischnura elegans f. typica'' *''Ischnura elegans f. violacea'' Distribution This species is present in most of Europe and the Middle East. It is a common species. Habitat These damselflies can be found in a wide range of lowland environments, with standing and slow flowing waters, brackish and polluted water. Description ''Ischnura elegans'' can reach a body length of and a wingspan of about . Hindwings reach a length of .L. Watson and M. J. DallwitBritish Insects: the Odonata (Dragonflies and Damselflies/ref> Adult male blue-tailed damse ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
