The Fraser Darling effect is the simultaneous and shortened breeding season that occurs in large colonies of birds.[1] This synchronized and accelerated breeding leads to a greater chance of survival for each individual offspring.[2]
Nest of kittiwake on Gull Island in Alaska
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.[3]
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 other species that were more vulnerable to predation.[3] In 1968, while studying gulls, Horn found that "clumped nesting improves foraging efficiency and predation avoidance only when the colony is built in a large expanse of nesting habitat, surrounded by abundant, but patchily distributed food."[2]
^ abcYon-Tov, Yoram (October 1975). "Synchronization of Breeding and Intraspecific Interference in the Carrion Crow". The Auk. 92 (4). University of California Press: 778–785. doi:10.2307/4084788. JSTOR 4084788.
^ abWilson, Edward O. (2000). Sociobiology: The New Synthesis. Harvard University Press. p. 41.
January 01, 1970
fraser, darling, effect, simultaneous, shortened, breeding, season, that, occurs, large, colonies, birds, this, synchronized, accelerated, breeding, leads, greater, chance, survival, each, individual, offspring, nest, kittiwake, gull, island, alaska, effect, n. The Fraser Darling effect is the simultaneous and shortened breeding season that occurs in large colonies of birds 1 This synchronized and accelerated breeding leads to a greater chance of survival for each individual offspring 2 Nest of kittiwake on Gull Island in Alaska 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 3 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 other species that were more vulnerable to predation 3 In 1968 while studying gulls Horn found that clumped nesting improves foraging efficiency and predation avoidance only when the colony is built in a large expanse of nesting habitat surrounded by abundant but patchily distributed food 2 Since Fraser Darling s initial observation the phenomenon has also been observed in Brewer s blackbirds European herring gulls black headed gulls and gannets however other studies conducted since have not been able to confirm it in other various species of gulls 2 References edit Michael Allaby 1999 Fraser Darling effect Dictionary of Zoology Retrieved 2012 05 26 a b c Yon Tov Yoram October 1975 Synchronization of Breeding and Intraspecific Interference in the Carrion Crow The Auk 92 4 University of California Press 778 785 doi 10 2307 4084788 JSTOR 4084788 a b Wilson Edward O 2000 Sociobiology The New Synthesis Harvard University Press p 41 Retrieved from https en wikipedia org w index php title Fraser Darling effect amp oldid 1212518070, wikipedia, wiki, book, books, library,
