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Fraser Darling Effect
The Fraser Darling effect is the simultaneous and shortened breeding season that occurs in large colonies of birds. This synchronized and accelerated breeding leads to a greater chance of survival for each individual offspring. The effect is named after Sir Frank Fraser Darling who proposed it in 1938. While studying herring gulls off the English coast, Fraser Darling noticed that individual gulls rarely raised their young past the fledgling stage. This led him to the conclusion that the birds received sexual stimulation not only from their mates but also from other birds of the same species. In 1956, a study conducted by Colson and White on the mating patterns of kittiwake showed that the effect only extended for two metres and that, for groups of birds who nested more sparsely, a longer breeding time was evident in the population as a whole. However, this particular species nested in areas that were hard for predators to reach and therefore relied less on this phenomenon than ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frank Fraser Darling
Sir Frank Fraser Darling FRSE (23 June 1903 – 22 October 1979) was an English ecologist, ornithologist, farmer, conservationist and author, who is strongly associated with the highlands and islands of Scotland. He gives his name to the Fraser Darling effect. Early life Fraser Darling was born in Soresby Street in Chesterfield in northern England, the illegitimate son of Harriet Cowley Ellse Darling and Cpt. Frank Moss. His mother was the daughter of a prosperous family from Sheffield. Her family wanted the child to be fostered and forgotten about. However, she would not cooperate and refused to part with Frank. His father, whom he never met, left for East Africa around the time of his birth, and was killed in action on the Kenya-Tanganyika border in 1917. In 1966 Darling revealed to his son that the pioneering plant geographer, Charles Edward Moss, was his uncle. Career After running away from school at the age of 15, Darling was sent to work on a farm in the Pennines. He th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Breeding Season
Seasonal breeders are animal species that successfully mate only during certain times of the year. These times of year allow for the optimization of survival of young due to factors such as ambient temperature, food and water availability, and changes in the predation behaviors of other species. Related sexual interest and behaviors are expressed and accepted only during this period. Female seasonal breeders will have one or more estrus cycles only when she is "in season" or fertile and receptive to mating. At other times of the year, they will be anestrus, or have a dearth of their sexual cycle. Unlike reproductive cyclicity, seasonality is described in both males and females. Male seasonal breeders may exhibit changes in testosterone levels, testes weight, and fertility depending on the time of year. Seasonal breeders are distinct from opportunistic breeders, that mate whenever the conditions of their environment become favorable, and continuous breeders that mate year-round. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
European Herring Gull
The European herring gull (''Larus argentatus'') is a large gull, up to long. One of the best-known of all gulls along the shores of Western Europe, it was once abundant. It breeds across Northern Europe, Western Europe, Central Europe, Eastern Europe, Scandinavia, and the Baltic states. Some European herring gulls, especially those resident in colder areas, migrate further south in winter, but many are permanent residents, e.g. in Ireland, Britain, Iceland, or on the North Sea shores. They have a varied diet, including fish, crustaceans, as well as some plants, and are also scavengers, consuming carrion and food left by or stolen from humans. While herring gull numbers appear to have been harmed in recent years, possibly by fish population declines and competition, they have proved able to survive in human-adapted areas and can often be seen in towns acting as scavengers. Taxonomy Their scientific name is from Latin. ''Larus'' appears to have referred to a gull or other large ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fledgling (birds)
Fledging is the stage in a flying animal's life between hatching or birth and becoming capable of flight. This term is most frequently applied to birds, but is also used for bats. For altricial birds, those that spend more time in vulnerable condition in the nest, the nestling and fledging stage can be the same. For precocial birds, those that develop and leave the nest quickly, a short nestling stage precedes a longer fledging stage. All birds are considered to have fledged when the feathers and wing muscles are sufficiently developed for flight. A young bird that has recently fledged but is still dependent upon parental care and feeding is called a fledgling. People often want to help fledglings, as they appear vulnerable, but it is best to leave them alone. The USA National Phenology Network defines the phenophase (or life cycle stage) of fledged young for birds as "One or more young are seen recently departed from the nest. This includes young incapable of sustained fli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sexual Stimulation
Sexual stimulation is any stimulation, stimulus (including bodily contact) that leads to, enhances and maintains sexual arousal, and may lead to orgasm. Although sexual arousal may arise without physical stimulation, achieving orgasm usually requires physical sexual stimulation. The term ''sexual stimulation'' often implies stimulation of the sex organ, genitals, but may also include stimulation of other areas of the body, stimulation of the senses (such as sight or hearing) and mental stimulation (i.e. from reading or sexual fantasy, fantasizing). Sufficient stimulation of the human penis, penis or clitoris usually results in an orgasm. Stimulation can be by self (e.g., masturbation) or by a sexual partner (sexual intercourse or other Human sexual activity, sexual activity), by use of objects or tools, or by some combination of these methods. Some people practice Edging (sexual practice), orgasm control, whereby a person or their sexual partner controls the level of sexual stimu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Black-legged Kittiwake
The black-legged kittiwake (''Rissa tridactyla'') is a seabird species in the gull family Laridae. This species was first described by Carl Linnaeus in his landmark 1758 10th edition of ''Systema Naturae'' as ''Larus tridactylus''. The English name is derived from its call, a shrill 'kittee-wa-aaake, kitte-wa-aaake'. The genus name ''Rissa'' is from the Icelandic name ''rita'' for this bird, and the specific ''tridactyla'' is from Ancient Greek ''tridaktulos'', "three-toed", from ''tri-'', "three-" and ''daktulos'', "toe". In North America, this species is known as the black-legged kittiwake to differentiate it from the red-legged kittiwake, but in Europe, where it is the only member of the genus, it is often known just as kittiwake. Range and distribution The black-legged kittiwake is a coastal bird of the arctic to subarctic regions of the world.del Hoyo, J; Elliott, A; Sargatal, J (1996). ''Handbook of the Birds of the World Vol. 3''. Barcelona: Lynx Edicions. pp. 622–62 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brewer's Blackbird
Brewer's blackbird (''Euphagus cyanocephalus'') is a medium-sized New World blackbird. It is named after the ornithologist Thomas Mayo Brewer. Description Adult males have black Feather, plumage with an iridescent purple head and neck and glossy bluish-green highlights on the rest of the body. The feet and legs are black and the eye is bright yellow. The female is brownish-grey with slight hints of the male's iridescence. The female's eye is dark brown, while the male's is bright yellow. Overall, they resemble the eastern member of the same genus, the rusty blackbird; the Brewer's blackbird, however, has a shorter bill and the male's head is iridescence, iridescent purple. This bird is often mistaken for the common grackle but has a shorter tail. The call is a sharp check which is also distinguishable. This bird is in a different family from the common blackbird, Eurasian blackbird. Habitat Their breeding habitat is open and semi-open areas, often near water, across central ... [...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 including Europe and also in coastal eastern Canada. Most of the population is migratory and winters further south, but some birds reside in the milder westernmost areas of Europe. Small numbers also occur in northeastern North America, where it was formerly known as the common black-headed gull. As is the case with many gulls, it was previously placed in the genus ''Larus''. The genus name '' Chroicocephalus'' is from Ancient Greek ''khroizo'', "to colour", and ''kephale'', "head". The specific ''ridibundus'' is Latin for "laughing", from ''ridere'' "to laugh". The black-headed gull displays a variety of compelling behaviours and adaptations. Some of these include removing eggshells from one's nest after hatching, begging co-ordination between siblings, differences between sexes, conspecific brood parasitism, and extra-pair paternity. They are an overwintering species, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gannet
Gannets are seabirds comprising the genus ''Morus'' in the family Sulidae, closely related to boobies. Gannets are large white birds with yellowish heads; black-tipped wings; and long bills. Northern gannets are the largest seabirds in the North Atlantic, having a wingspan of up to . The other two species occur in the temperate seas around southern Africa, southern Australia, and New Zealand. Etymology "Gannet" is derived from Old English ''ganot'' meaning "strong or masculine", ultimately from the same Old Germanic root as "gander". Taxonomy ''Morus'' is derived from Ancient Greek ''moros'' "stupid" or "foolish" due to lack of fear shown by breeding gannets and boobies, allowing them to be easily killed. Behaviour Hunting Gannets hunt fish by diving into the sea from a height of and pursuing their prey underwater, and have a number of adaptations: * They have no external nostrils; they are located inside the mouth, instead. * They have air sacs in the face and ch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sociobiology
Sociobiology is a field of biology that aims to examine and explain social behavior in terms of evolution. It draws from disciplines including psychology, ethology, anthropology, evolution, zoology, archaeology, and population genetics. Within the study of human societies, sociobiology is closely allied to evolutionary anthropology, human behavioral ecology, evolutionary psychology, and sociology. Sociobiology investigates social behaviors such as mating patterns, territorial fights, pack hunting, and the hive society of social insects. It argues that just as selection pressure led to animals evolving useful ways of interacting with the natural environment, so also it led to the genetic evolution of advantageous social behavior. While the term "sociobiology" originated at least as early as the 1940s, the concept did not gain major recognition until the publication of E. O. Wilson's book '' Sociobiology: The New Synthesis'' in 1975. The new field quickly became the subject of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ornithology
Ornithology is a branch of zoology that concerns the "methodological study and consequent knowledge of birds with all that relates to them." Several aspects of ornithology differ from related disciplines, due partly to the high visibility and the aesthetic appeal of birds. It has also been an area with a large contribution made by amateurs in terms of time, resources, and financial support. Studies on birds have helped develop key concepts in biology including evolution, behaviour and ecology such as the definition of species, the process of speciation, instinct, learning, ecological niches, guilds, island biogeography, phylogeography, and conservation. While early ornithology was principally concerned with descriptions and distributions of species, ornithologists today seek answers to very specific questions, often using birds as models to test hypotheses or predictions based on theories. Most modern biological theories apply across life forms, and the number of scientists w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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