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Thornback Ray
The thornback ray (''Raja clavata''), or thornback skate, is a species of ray (fish), ray fish in the family Rajidae. Distribution The Thornback ray is found in the Atlantic coastal waters of Europe and western Africa. It is also present from South Africa to the southwestern Indian Ocean and in the Mediterranean and Black Seas. It is native possibly as far south as Namibia and South Africa. Its natural habitats are open large seas and shallow seas. It is sometimes seen trapped in large estuary, estuarine pools at low tide. The thornback ray is probably one of the most common ray (fish), rays encountered by divers. Habitat The thornback ray is usually found on sedimentary seabeds such as mud, sand or gravel at depths between 10–60m. Juvenile fish feed on small crustaceans, particularly amphipods and bottom-living shrimps; adults feed on crabs, shrimps and small fish. Description Like all rays, the thornback ray has a flattened body with broad, wing-like pectoral fins. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Carl Linnaeus
Carl Linnaeus (23 May 1707 – 10 January 1778), also known after ennoblement in 1761 as Carl von Linné,#Blunt, Blunt (2004), p. 171. was a Swedish biologist and physician who formalised binomial nomenclature, the modern system of naming organisms. He is known as the "father of modern Taxonomy (biology), taxonomy". Many of his writings were in Latin; his name is rendered in Latin as and, after his 1761 ennoblement, as . Linnaeus was the son of a curate and was born in Råshult, in the countryside of Småland, southern Sweden. He received most of his higher education at Uppsala University and began giving lectures in botany there in 1730. He lived abroad between 1735 and 1738, where he studied and also published the first edition of his ' in the Netherlands. He then returned to Sweden where he became professor of medicine and botany at Uppsala. In the 1740s, he was sent on several journeys through Sweden to find and classify plants and animals. In the 1750s and 1760s, he co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
North Sea
The North Sea lies between Great Britain, Denmark, Norway, Germany, the Netherlands, Belgium, and France. A sea on the European continental shelf, it connects to the Atlantic Ocean through the English Channel in the south and the Norwegian Sea in the north. It is more than long and wide, covering . It hosts key north European shipping lanes and is a major fishery. The coast is a popular destination for recreation and tourism in bordering countries, and a rich source of energy resources, including wind energy, wind and wave power. The North Sea has featured prominently in geopolitical and military affairs, particularly in Northern Europe, from the Middle Ages to the modern era. It was also important globally through the power northern Europeans projected worldwide during much of the Middle Ages and into the modern era. The North Sea was the centre of the Viking Age, Vikings' rise. The Hanseatic League, the Dutch Golden Age, Dutch Republic, and Kingdom of Great Britain, Brita ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Fish Of The Mediterranean Sea
A fish (: fish or fishes) is an aquatic, anamniotic, gill-bearing vertebrate animal with swimming fins and a hard skull, but lacking limbs with digits. Fish can be grouped into the more basal jawless fish and the more common jawed fish, the latter including all living cartilaginous and bony fish, as well as the extinct placoderms and acanthodians. In a break to the long tradition of grouping all fish into a single class (Pisces), modern phylogenetics views fish as a paraphyletic group. Most fish are cold-blooded, their body temperature varying with the surrounding water, though some large active swimmers like white shark and tuna can hold a higher core temperature. Many fish can communicate acoustically with each other, such as during courtship displays. The study of fish is known as ichthyology. The earliest fish appeared during the Cambrian as small filter feeders; they continued to evolve through the Paleozoic, diversifying into many forms. The earliest fi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Fish Of The East Atlantic
A fish (: fish or fishes) is an aquatic animal, aquatic, Anamniotes, anamniotic, gill-bearing vertebrate animal with swimming fish fin, fins and craniate, a hard skull, but lacking limb (anatomy), limbs with digit (anatomy), digits. Fish can be grouped into the more basal (phylogenetics), basal jawless fish and the more common jawed fish, the latter including all extant taxon, living cartilaginous fish, cartilaginous and bony fish, as well as the extinct placoderms and acanthodians. In a break to the long tradition of grouping all fish into a single Class (biology), class (Pisces), modern phylogenetics views fish as a paraphyletic group. Most fish are ectotherm, cold-blooded, their body temperature varying with the surrounding water, though some large nekton, active swimmers like white shark and tuna can hold a higher core temperature. Many fish can communication in aquatic animals#Acoustic, communicate acoustically with each other, such as during courtship displays. The stud ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Dumfries And Galloway
Dumfries and Galloway (; ) is one of the 32 unitary council areas of Scotland, located in the western part of the Southern Uplands. It is bordered by East Ayrshire, South Ayrshire, and South Lanarkshire to the north; Scottish Borders to the north-east; the English county of Cumbria, the Solway Firth, and the Irish Sea to the south, and the North Channel (Great Britain and Ireland), North Channel to the west. The administrative centre and largest settlement is the town of Dumfries. The second largest town is Stranraer, located to the west of Dumfries on the North Channel coast. Dumfries and Galloway corresponds to the counties of Scotland, historic shires of Dumfriesshire, Kirkcudbrightshire, and Wigtownshire, the last two of which are collectively known as Galloway. The three counties were combined in 1975 to form a single regions and districts of Scotland, region, with four districts within it. The districts were abolished in 1996, since when Dumfries and Galloway has been a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Cumbria
Cumbria ( ) is a ceremonial county in North West England. It borders the Scottish council areas of Dumfries and Galloway and Scottish Borders to the north, Northumberland and County Durham to the east, North Yorkshire to the south-east, Lancashire to the south, and the Irish Sea to the west. Its largest settlement is the city of Carlisle. Cumbria is predominantly rural, with an area of and a population of 500,012; this makes it the third-largest ceremonial county in England by area but the eighth-smallest by population. Carlisle is located in the north; the towns of Workington and Whitehaven lie on the west coast, Barrow-in-Furness on the south coast, and Penrith, Cumbria, Penrith and Kendal in the east of the county. For local government purposes the county comprises two Unitary authorities of England, unitary authority areas, Westmorland and Furness and Cumberland (unitary authority), Cumberland. Cumbria was created in 1974 from the historic counties of Cumberland and Westmor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Solway Firth
The Solway Firth is an inlet on the west coast of Great Britain, forming part of the border between England and Scotland. The firth (a Scottish term for an inlet of the sea) divides Cumbria (including the Solway Plain) from Dumfries and Galloway. The Isle of Man is also very near to the firth. The firth comprises part of the Irish Sea. The firth's coastline is characterised by lowland hills and small mountains. It is a mainly rural area, with mostly small villages and settlements (such as Powfoot). Fishing, hill farming, and some arable farming play a large part in the local economy, although tourism is increasing. The northern part of the English coast of the Solway Firth was designated as an Area of Outstanding Natural Beauty, known as the Solway Coast, in 1964. Construction of the Robin Rigg Wind Farm in the firth began in 2007. Within the firth, there are some Salt marsh, salt marshes and mud flats that can be dangerous, due to their frequently shifting patches of quicksa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Host (biology)
In biology and medicine, a host is a larger organism that harbours a smaller organism; whether a parasite, parasitic, a mutualism (biology), mutualistic, or a commensalism, commensalist ''guest'' (symbiont). The guest is typically provided with nourishment and shelter. Examples include animals playing host to parasitic worms (e.g. nematodes), cell (biology), cells harbouring pathogenic (disease-causing) viruses, or a Fabaceae, bean plant hosting mutualistic (helpful) Rhizobia, nitrogen-fixing bacteria. More specifically in botany, a host plant supplies nutrient, food resources to micropredators, which have an evolutionarily stable strategy, evolutionarily stable relationship with their hosts similar to ectoparasitism. The host range is the collection of hosts that an organism can use as a partner. Symbiosis Symbiosis spans a wide variety of possible relationships between organisms, differing in their permanence and their effects on the two parties. If one of the partners in an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Pontobdella Muricata
''Pontobdella muricata'' is a species of marine leech in the family Piscicolidae. It is a parasite of fishes and is native to the northeastern Atlantic Ocean, the Baltic Sea, the North Sea, and the Mediterranean Sea. Description ''Pontobdella muricata'' is a long, cylindrical, somewhat flattened leech, narrowing at both ends. It has a number of annulations, which do not correspond to its internal segmentation, and is one of the largest sea leeches, with a length up to long when at rest, and double that length when stretched. The anterior end has a sucker with which it feeds, and the posterior end bears another sucker with which it adheres to its host. The skin is rough and covered with small warts; the colour varies, juveniles are usually black or dark green with small speckles, while adults are pale grey, tan, or olive-green. Distribution and habitat Native to the northeastern Atlantic Ocean, the species ranges from the Arctic, the Baltic Sea, and the North Sea, to the Mediter ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Polyandry In Fish
Polyandry in fishes is a mating system where females mate with multiple males within one mating season.Simmons, L. W., Beveridge, M. & Evans, J. P. Molecular evidence for multiple paternity in a feral population of green swordtails. The Journal of heredity 99, 610–5 (2008). This type of mating exists in a variety of animal species. Polyandry has been found in both oviparous and viviparous bony fishes and sharks.Portnoy, D. S., Piercy, A. N., Musick, J. a, Burgess, G. H. & Graves, J. E. Genetic polyandry and sexual conflict in the sandbar shark, Carcharhinus plumbeus, in the western North Atlantic and Gulf of Mexico. Molecular ecology 16, 187–97 (2007). General examples of polyandry occur in fish species, such as green swordtails and Trinidadian guppies.Barbosa, M., Dornelas, M. & Magurran, a E. Effects of polyandry on male phenotypic diversity. Journal of Evolutionary Biology 23, 2442–52 (2010). Specific types of polyandry have also been classified, such as classical polyand ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Oviparous
Oviparous animals are animals that reproduce by depositing fertilized zygotes outside the body (i.e., by laying or spawning) in metabolically independent incubation organs known as eggs, which nurture the embryo into moving offsprings known as hatchlings with little or no embryonic development within the mother. This is the reproductive method used by most animal species, as opposed to viviparous animals that develop the embryos internally and metabolically dependent on the maternal circulation, until the mother gives birth to live juveniles. Ovoviviparity is a special form of oviparity where the eggs are retained inside the mother (but still metabolically independent), and are carried internally until they hatch and eventually emerge outside as well-developed juveniles similar to viviparous animals. Modes of reproduction The traditional modes of reproduction include oviparity, taken to be the ancestral condition, traditionally where either unfertilised oocytes or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
