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Banff Longnose Dace
The Banff longnose dace (''Rhinichthys cataractae smithi'') was a diminutive (about five cm. long) version of the eastern longnose dace, its range restricted to a small marsh fed by two hot springs on Sulphur Mountain in Banff National Park in Banff, Alberta. The development of a popular thermal swimming pool at the Cave and Basin eventually led to pollution of the dace's habitat. Deliberate introduction of mosquitofish in the 1920s was followed by various tropical fish (and aquarium plants) which reproduce year-round in the marsh, while the Banff longnose dace only spawned once a year. The exotic fish also out-competed the dace for food and preyed on unhatched eggs. The few remaining Banff longnose dace hybridized with the Eastern longnose dace from the nearby Bow River. In 1981 a research study showed that the habitat destruction and the introduction of the non-native fish threatened the dace. It is hypothesized that this Banff subspecies' unique genetic structure was irre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhinichthys
''Rhinichthys'', known as the riffle daces, is a genus of freshwater fish in the carp family (Cyprinidae) of the order Cypriniformes. The type species is ''Rhinichthys atratulus'', the blacknose dace. ''Rhinichthys'' species range throughout North America. The genus contains eight living species, one of which (the loach minnow) is considered Vulnerable. It also includes the extinct Las Vegas dace, which was only first described in 1984 and had disappeared by 1986. The cheat minnow (''Pararhinichthys bowersi''), a natural hybrid of the longnose dace (''R. cataractae'') and the river chub (''Nocomis micropogon''), was formerly placed in this genus, but is now valid under ''Pararhinichthys''. The riffle daces are a basal lineage in an insufficiently resolved clade of American Leuciscinae. Such a group had been proposed on anatomical evidence, and was verified using mtDNA 12S rRNA sequences.(Simons & Mayden 1997) Species * ''Rhinichthys atratulus'' ( Hermann, 1804) (Eastern b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Centimetre
330px, Different lengths as in respect to the Electromagnetic spectrum, measured by the Metre and its deriveds scales. The Microwave are in-between 1 meter to 1 millimeter. A centimetre (international spelling) or centimeter (American spelling) (SI symbol cm) is a Units of measurement, unit of length in the International System of Units (SI), equal to one hundredth of a metre, ''centi'' being the SI prefix for a factor of . The centimetre was the base unit of length in the now deprecated centimetre–gram–second (CGS) system of units. Though for many physical quantities, SI prefixes for factors of 103—like ''milli-'' and ''kilo-''—are often preferred by technicians, the centimetre remains a practical unit of length for many everyday measurements. A centimetre is approximately the width of the fingernail of an average adult person. Equivalence to other units of length : One millilitre is defined as one cubic centimetre, under the SI system of units. Other uses In ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Longnose Dace
The longnose dace (''Rhinichthys cataractae'') is a freshwater minnow native to North America. ''Rhinicthys'' means snout fish (reference to the long snout) and ''cataractae'' means of the cataract (first taken from Niagara Falls). Longnose dace are small, typically less than 100 mm and characterized by their fleshy snout that protrudes past the mouth. They are well adapted for living on the bottom of fast-flowing streams among stones. Longnose dace eat algae and aquatic insects and are important forage minnows for larger predatory fish. Description Longnose dace can be mistaken for suckers because of their subterminal "sucker-like" mouth. However, longnose dace (like all members of the family cyprinidae) lack small fleshy projections, called papillae, on their mouths. Juveniles have a black lateral line that extends from the beginning of the eye to the caudal fin that fades as the fish matures. The lateral line in juveniles is not present in all populations. In adults, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sulphur Mountain (Alberta)
Sulphur Mountain is a mountain in Banff National Park in the Canadian Rocky Mountains overlooking the town of Banff, Alberta, Canada. The mountain was named in 1916 for the hot springs on its lower slopes. George Dawson had referred to this landform as Terrace Mountain on his 1886 map of the area. Sanson's Peak was named in 1948 for Norman Bethune Sanson who diligently attended the observatory recording equipment atop Sulphur Mountain for nearly 30 years. Recreation Two hot springs have been commercially developed. The lowest is the Cave and Basin National Historic Site and the highest is the Banff Upper Hot Springs. A gondola on the eastern slope goes to the summit ridge which has an upper terminal containing three restaurants, a gift shop, and multiple observation decks. The summit ridge provides views both westward up and east down the Bow Valley. A boardwalk can be followed on the north side to the top of Sanson's Peak (). The original, and more scenic, summit a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Banff National Park
Banff National Park is Canada's oldest National Parks of Canada, national park, established in 1885 as Rocky Mountains Park. Located in Alberta's Rockies, Alberta's Rocky Mountains, west of Calgary, Banff encompasses of mountainous terrain, with many glaciers and ice fields, dense pinophyta, coniferous forest, and alpine landscapes. The Icefields Parkway extends from Lake Louise, Alberta, Lake Louise, connecting to Jasper National Park in the north. Provincial forests and Yoho National Park are neighbours to the west, while Kootenay National Park is located to the south and Kananaskis Country to the southeast. The main commercial centre of the park is the town of Banff, Alberta, Banff, in the Bow River valley. The Canadian Pacific Railway was instrumental in Banff's early years, building the Banff Springs Hotel and Chateau Lake Louise, and attracting tourists through extensive advertising. In the early 20th century, roads were built in Banff, at times by war internees from Wor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Banff, Alberta
Banff is a town within Banff National Park in Alberta, Canada. It is located in Alberta's Rockies along the Trans-Canada Highway, approximately west of Calgary and east of Lake Louise. At above Banff is the community with the second highest elevation in Alberta, after Lake Louise. The Town of Banff was the first municipality to incorporate within a Canadian national park. The town is a member of the Calgary Regional Partnership. Banff is a resort town and one of Canada's most popular tourist destinations. Known for its mountainous surroundings and hot springs, it is a destination for outdoor sports and features extensive hiking, biking, scrambling and skiing destinations within the area. Sunshine Village, Ski Norquay and Lake Louise Ski Resort are the three nearby ski resorts located within the national park. Toponymy The area was named Banff in 1884 by George Stephen, president of the Canadian Pacific Railway, recalling his birthplace near Banff, Scotland. The Canadian ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cave And Basin National Historic Site
The Cave and Basin National Historic Site of Canada is located in the town of Banff, Alberta, within the Canadian Rocky Mountains, at the site of natural thermal mineral springs around which Canada's first national park, Banff National Park, was established. Geology and setting The Cave and Basin is the lowest component of nine sulphurous hot springs clustered in three groups on the northeast flank of Sulphur Mountain. All are located along the Sulphur Mountain Thrust Fault below Devonian limestones. The water is heated geothermally from an estimated depth of three kilometres. The Cave and Basin is the only cavern large enough to comfortably accommodate groups of people. History Human habitation in this area can be traced back to 10,700 years BC with the retreat of the last great glaciation, and it is unlikely that the hot springs escaped being noticed. The first recorded reference to hot springs here is by James Hector of the Palliser Expedition in 1859, followed by Joe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mosquitofish
The western Mosquitofish (''Gambusia affinis'') is a North American freshwater fish, also known commonly, if ambiguously, as simply Mosquitofish or by its generic name, ''Gambusia'', or by the common name gambezi. Its sister species, the eastern mosquitofish (''Gambusia holbrooki'') is also referred to by these names. Mosquitofish are small in comparison to many other freshwater fish, with females reaching a maximum length of and males a maximum length of . The female can be distinguished from the male by her larger size and a gravid spot at the posterior of her abdomen. The name "Mosquitofish" was given because the fish eats mosquito larvae, and has been used more than any other fishes for the biological control of mosquitoes. Gambusia typically eat zooplankton, beetles, mayflies, caddisflies, mites, and other invertebrates; mosquito larvae make up only a small portion of their diet. Mosquitofish were introduced directly into ecosystems in many parts of the world as a biocon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Habitat Destruction
Habitat destruction (also termed habitat loss and habitat reduction) is the process by which a natural habitat becomes incapable of supporting its native species. The organisms that previously inhabited the site are displaced or dead, thereby reducing biodiversity and species abundance. Habitat destruction is the leading cause of biodiversity loss. Fragmentation and loss of habitat have become one of the most important topics of research in ecology as they are major threats to the survival of endangered species. Activities such as harvesting natural resources, industrial production and urbanization are human contributions to habitat destruction. Pressure from agriculture is the principal human cause. Some others include mining, logging, trawling, and urban sprawl. Habitat destruction is currently considered the primary cause of species extinction worldwide. Environmental factors can contribute to habitat destruction more indirectly. Geological processes, climate change, introdu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Banff Springs Snail
The Banff Springs snail (''Physella johnsoni'') is a species of small air-breathing freshwater snail in the family Physidae. Based on molecular research, it appears that ''Physella johnsoni'' separated out as a species from '' Physella gyrina'' about 10,000 years ago. Description, habitat and distribution These aquatic pulmonate gastropod mollusks are approximately the size of unpopped corn kernels. The largest ones are only about one centimetre long, and like all of the Physidae, the shells are sinistral or coiled left-handed. The snails' diet consists of periphyton. The Banff Springs snail was first identified in 1926 in the nine sulphurous hot springs of Sulphur Mountain in Banff National Park, Alberta, Canada, and has been found nowhere else. It is very unusual because it is adapted to life in thermal springs where the water is low in oxygen and high in hydrogen sulfide, an environment too harsh for most animals to survive in. Since its discovery, its range has shru ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fish Of North America Becoming Extinct Since 1500
Fish are Aquatic animal, aquatic, craniate, gill-bearing animals that lack Limb (anatomy), limbs with Digit (anatomy), digits. Included in this definition are the living hagfish, lampreys, and Chondrichthyes, cartilaginous and bony fish as well as various extinct related groups. Approximately 95% of living fish species are ray-finned fish, belonging to the class Actinopterygii, with around 99% of those being teleosts. The earliest organisms that can be classified as fish were soft-bodied chordates that first appeared during the Cambrian period. Although they lacked a vertebrate, true spine, they possessed notochords which allowed them to be more agile than their invertebrate counterparts. Fish would continue to evolve through the Paleozoic era, diversifying into a wide variety of forms. Many fish of the Paleozoic developed placodermi, external armor that protected them from predators. The first fish with jaws appeared in the Silurian period, after which many (such as sharks) b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
