For more information, log on to-
http://shomusbiology.weebly.com/
Download the study materials here-
http://shomusbiology.weebly.com/bio-m...
In ecology, r/K selection theory relates to the selection of combinations of traits in an organism that trade off between quantity and quality of offspring. The focus upon either increased quantity of offspring at the expense of individual parental investment, or reduced quantity of offspring with a corresponding increased parental investment, varies widely, seemingly to promote success in particular environments.
In this context, r-selection makes a species prone to numerous reproduction at low cost per individual offspring, while K-selected species expend high cost in reproduction for a low number of more difficult to produce offspring. Neither mode of propagation is intrinsically superior, and in fact they can coexist in the same habitat, as in rodents and elephants. r/K selection theory is also useful in studying the evolution of ecological and life history differences between subspecies such as the African honey bee, A. m. scutellata, and the Italian bee, A. m. ligustica.[1]
The theory was popular in the 1970s and 1980s when it was used as a heuristic device, but lost importance in the early 1990s as it was criticized by several empirical studies.[2][3] The r/K selection paradigm has been replaced by a life-history paradigm. However, this continues to incorporate many of the themes important to the r/K paradigm.[4]
The terminology of r/K-selection was coined by the ecologists Robert MacArthur and E. O. Wilson[5] based on their work on island biogeography,[6] although the concept of the evolution of life history strategies has a longer history.[7] Source of the article published in description is Wikipedia. I am sharing their material. Copyright by original content developers.
Link- http://en.wikipedia.org/wiki/Main_Page
Population ecology part 4 r and k selection habitat de las aves | |
| 421 Likes | 421 Dislikes |
| 38,434 views views | 750K followers |
| Education | Upload TimePublished on 13 Nov 2013 |
Không có nhận xét nào:
Đăng nhận xét