|
Polyandry In Fish
Polyandry in fish 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 fish 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 polyandry in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mating System
A mating system is a way in which a group is structured in relation to sexual behaviour. The precise meaning depends upon the context. With respect to animals, the term describes which males and females mating, mate under which circumstances. Recognised systems include monogamy, polygamy (which includes polygyny, polyandry, and polygynandry), and promiscuity, all of which lead to different mate choice outcomes and thus these systems affect how sexual selection works in the species which practice them. In plants, the term refers to the degree and circumstances of outcrossing. In human sociobiology, the terms have been extended to encompass the formation of relationships such as marriage. In plants The primary mating systems in plants are outcrossing (cross-fertilisation), autogamy (self-fertilisation) and apomixis (asexual reproduction without fertilization, but only when arising by modification of sexual function). Mixed mating systems, in which plants use two or even all three ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Syngnathidae
The Syngnathidae is a family of fish which includes seahorses, pipefishes, and seadragons (''Phycodurus'' and ''Phyllopteryx''). The name is derived from grc, σύν (), meaning "together", and (), meaning "jaw". The fused jaw is one of the traits that the entire family have in common. Description and biology Syngnathids are found in temperate and tropical seas across the world. Most species inhabit shallow, coastal waters, but a few are known from the open ocean, especially in association with sargassum mats. They are characterised by their elongated snouts, fused jaws, the absence of pelvic fins, and by thick plates of bony armour covering their bodies. The armour gives them a rigid body, so they swim by rapidly fanning their fins. As a result, they are relatively slow compared with other fish but are able to control their movements with great precision, including hovering in place for extended periods. Uniquely, after syngnathid females lay their eggs, the male then fertiliz ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elasmobranch
Elasmobranchii () is a subclass of Chondrichthyes or cartilaginous fish, including sharks (superorder Selachii), rays, skates, and sawfish (superorder Batoidea). Members of this subclass are characterised by having five to seven pairs of gill clefts opening individually to the exterior, rigid dorsal fins and small placoid scales on the skin. The teeth are in several series; the upper jaw is not fused to the cranium, and the lower jaw is articulated with the upper. The details of this jaw anatomy vary between species, and help distinguish the different elasmobranch clades. The pelvic fins in males are modified to create claspers for the transfer of sperm. There is no swim bladder; instead, these fish maintain buoyancy with large livers rich in oil. The definition of the clade is unclear with respect to fossil chondrichthyans. It has been used by different authors as equivalent to Neoselachii (the clade including modern sharks and rays and their last common ancestor) or for al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Tanganyika
Lake Tanganyika () is an African Great Lake. It is the second-oldest freshwater lake in the world, the second-largest by volume, and the second-deepest, in all cases after Lake Baikal in Siberia. It is the world's longest freshwater lake. The lake is shared among four countries—Tanzania, the Democratic Republic of the Congo (DRC), Burundi, and Zambia, with Tanzania (46%) and DRC (40%) possessing the majority of the lake. It drains into the Congo River system and ultimately into the Atlantic Ocean. Etymology "Tanganika" was the name of the lake that Henry Morton Stanley encountered when he was at Ujiji in 1876. The name first originated from the Bembe language when they arrived in South Kivu around the 7th century, they discovered the lake and started calling it “êtanga ‘ya’ni’â” which means “a big river” in their Bantu language. Stanley found also other names for the lake among different ethnic groups, like the Kimana, the Yemba and the Msaga. An alt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Julidochromis Transcriptus
The masked julie (''Julidochromis transcriptus'') is a species of cichlid endemic to Lake Tanganyika in Africa where it is found only along the northwestern shore preferring areas with rocky substrates. They eat zooplankton and benthic invertebrates found in the algae growth in the wild. This species reaches a length of TL. See also * List of freshwater aquarium fish species References masked julie Fish described in 1959 Taxa named by Hubert Matthes Taxonomy articles created by Polbot {{Lamprologini-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chalinochromis Brichardi
''Chalinochromis brichardi'' is a species of fish in the family Cichlidae. It is found in Burundi, the Democratic Republic of the Congo, Tanzania, and Zambia Zambia (), officially the Republic of Zambia, is a landlocked country at the crossroads of Central, Southern and East Africa, although it is typically referred to as being in Southern Africa at its most central point. Its neighbours are t .... It is endemic to Lake Tanganyika. It builds a nest of rubble which is hidden by plants or algae, and its diet consists primarily of invertebrates. The specific name of this fish honours the fish dealer Pierre Brichard (1921-1990), who was the collector of the type. Description Adult specimens average a length of approximately 8.9 cm (3.5 inches), but larger specimens up to 14 cm (5.5 inches) have been recorded in captivity. ''C. brichardi'' lacks any body striping as an adult, only possessing barring around the facial region, which differentiates it from other ''Chalino ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neolamprologus Pulcher
''Neolamprologus pulcher'' is a species of cichlid endemic to Lake Tanganyika where it prefers locations with plenty of sedimentation. The common name for ''N. pulcher'' is the daffodil cichlid. This species can reach a length of TL. It can also be found in the aquarium trade. Taxonomy and phylogeny Previously, it was believed that ''N. pulcher'' and ''N. brichardi'' were two distinct species. Now they are considered the same species, the only difference being that Neolamprologus brichardi has a black stripe running from its eye to its gill cover and a yellow spot just above it, both of which are absent in N. pulcher. Because Neolamprologus pulcher is the older of the two scientific names, the rules of scientific nomenclature would make this the correct name for the species. The daffodil cichlid, when it was still known as N. brichardi, was named after Pierre Brichard, a Belgian who set up a collection station, for the export of Tanganyikan cichlids in 1971, named "Fishes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Syngnathus Typhle
The broadnosed pipefish or deepnosed pipefish (''Syngnathus typhle'') is a fish of the family Syngnathidae (seahorses and pipefishes). It is native to the Eastern Atlantic from Vardø in Norway, Baltic Sea (north to the Gulf of Finland) and the British Isles at north to Morocco at south. It is also found in the Mediterranean Sea, Black Sea and Sea of Azov. It is common in the coastal shallow waters, usually on reefs with seagrasses. This species is notable for its "broad" snout, which is as deep as its body. Description The broadnosed pipefish is a slender, elongated fish with a hexagonal cross-section which distinguishes it from its even more threadlike relation the straightnose pipefish (''Nerophis ophidion''), which has a circular cross-section. The body surface is covered by small bony plates. The head resembles that of a seahorse with a long, laterally flattened snout and obliquely sloping mouth. Unlike the straightnose pipefish, it has a fan-shaped caudal fin. The general c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Secondary Sexual Characteristics
Secondary sex characteristics are features that appear during puberty in humans, and at sexual maturity in other animals. These characteristics are particularly evident in the sexually dimorphic phenotypic traits that distinguish the sexes of a species, but unlike the sex organs (primary sex characteristics), are not directly part of the reproductive system. Secondary sex characteristics are believed to be the product of sexual selection for traits which display fitness, giving an organism an advantage over its rivals in courtship and in aggressive interactions. Secondary sex characteristics include, for example, the manes of male lions, the bright facial and rump coloration of male mandrills, and horns in many goats and antelopes. These characteristics are believed to be produced by a positive feedback loop known as the Fisherian runaway produced by the secondary characteristic in one sex and the desire for that characteristic in the other sex. Male birds and fish of many specie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Syngnathus Scovelli
The Gulf pipefish (''Syngnathus scovelli'') is a species of pipefish in the member of the taxonomic family Sygnathidae.Hoese, H.D., Moore, R.H. (1998''). Fishes of the Gulf of Mexico, Texas, Louisiana, and Adjacent Waters'', 2nd edition. Texas A&M University Press, College Station, TX. pp. 188-189. Syngnathus scovelli is native to the region of south Florida, united states, the Atlantic Ocean and ect. S. scovelli is similar to the species Opossum pipefish also known by its scientific name as ''Microphis'' ''brachyurus''. Description S. scovelli is an elongated fish encased in body rings. They are uniformly brown or dark olive green in color, with silvery, white vertical bars along the sides, sometimes appearing Y-shaped. Their maximum size is 183 mm SL, although most gulf pipefish rarely exceed 100 mm SL. They have a short snout, its length going into its HL 1.9-2.3 times. This species has 18-19 trunk rings and 30-34 tail rings. The dorsal fin is moderate in length and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nerophis Ophidion
''Nerophis'' is a genus of pipefishes native to the eastern Atlantic Ocean The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about . It covers approximately 20% of Earth's surface and about 29% of its water surface area. It is known to separate the " Old World" of Africa, Europe .... Species There are currently three recognized species in this genus: Image:Nerophis lumbriciformis Batz.jpg, '' Nerophis lumbriciformis'' Image:Nerophis maculatus.jpg, '' Nerophis maculatus'' Image:Nerophis ophidion2.JPG, '' Nerophis ophidion'' References {{Taxonbar, from=Q136422 Syngnathidae Marine fish genera Taxa named by Constantine Samuel Rafinesque ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Straightnose Pipefish
The straightnose pipefish (''Nerophis ophidion'') is a species of pipefish which lives in brackish water in the northeastern Atlantic, the Baltic, Mediterranean and Black Sea. Description The straightnose pipefish initially gives the impression of being a worm. The head is tiny and resembles that of a seahorse, to which this fish is closely related. The body is round in cross-section and the fins are tiny. The only fish with which it might be confused is the broadnosed pipefish (''Syngnathus typhle'') but that is more robust and has a hexagonal cross-section. The general colour of the straightnose pipefish is green with a yellowish belly. The female has pale blue markings on the head and body and both sexes become more colourful at breeding time when the male's snout turns yellow. The average size is about with a maximum of . Range This fish is found in the North-eastern Atlantic along the coasts of Europe, its range extending from southern Norway to Morocco. It is also present ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
