On r- and k-selection
In r/K selection theory, selective pressures are hypothesised to drive evolution in one of two generalized directions: r- or K-selection. These terms, r and K, are drawn from standard ecological algebra as illustrated in the simplified Verhulst model of population dynamics: where N is the population, r is the … See more 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 on either an increased quantity of offspring at the expense of … See more Although r/K selection theory became widely used during the 1970s, it also began to attract more critical attention. In particular, a review by the ecologist Stephen C. Stearns drew … See more • Evolutionary game theory • Life history theory • Minimax/maximin strategy • Ruderal species • Semelparity and iteroparity See more In areas of major ecological disruption or sterilisation (such as after a major volcanic eruption, as at Krakatoa or Mount St. Helens), r- and K-strategists play distinct roles in the See more While usually applied at the level of species, r/K selection theory is also useful in studying the evolution of ecological and life history differences between subspecies, for instance the African honey bee, A. m. scutellata, and the Italian bee, A. m. ligustica. … See more WebNot going to god selection. Is anyone else not going to god selection when queuing with teammates? I am queuing with teammates and when I queue alone I have no problem but …
On r- and k-selection
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Webr- and K-selection in fluctuating populations is determined by the evolutionary trade-off between two fitness measures: Growth rate and lifetime reproductive success In a stable environment, evolution maximizes growth rates in populations that are not density regulated and the carrying capacity in the case of density regulation. WebIn this equation N is the number of individuals in the population and t is time. The factor (1– [ N / K ]) is often added to the equation to place an upper limit on population growth by …
WebSep 10, 2024 · K-selection and r-selection are the two broad categories of life history strategies. The life history strategy of a species incorporates aspects of how the organism reproduces, its... WebAlexander H. Kiser, Jennifer M. Khan, Clinton R. Robertson, Roel Lopez, Charles R. Randklev The effect of flow and mussel species traits on the occurrence of rare mussels: A case …
WebK-selected organisms are more prone to extinction than r-selected species because they mature later in life and have fewer offspring with longer gestation periods. They are less easily subject to predation. Have low mortality rate. K-selected species tend to have an S-shaped population growth curve. WebK and r Reproductive Strategies In the equations describing growth of populations of organisms, r represents the slope of the line representing exponential growth. The letter K represents the carrying capacity of a …
WebIn this video we look at the difference between two reproductive strategies; r and K selection.
WebYou can see r- and K-selected strategies clearly by looking at different organisms within a phylogenetic group, such as the mammals. For example, elephants are highly K-selected, … feedback performer recumbent bicycleWebApr 1, 2024 · K-selected organisms are more prone to extinction than r-selected species because they mature later in life and have fewer offspring with longer gestation periods. … defeat nightfangWebFor Sale: 0 25th St, Port Huron Twp, MI 48060 ∙ $19,900 ∙ MLS# 20240023487 ∙ Great building site in Port Huron Township. The property is zoned B-3 and will allow single … defeat nyt create accountWebFeb 12, 2024 · K-selected species are those that are larger, have long lifespans, produce few young at a time, and exhibit logistic growth. R-selected species are those that have … feedback past tenseWebApr 5, 2024 · K-selection, or "density-dependent selection", is a type of natural selection in which an organism's ability to survive and reproduce depends on its ability to compete for resources with other members of its species. K-selected species typically have long lifespans, invest heavily in offspring, and tend to produce fewer offspring. defeat nightwatcher meraylWebThus, K-selection is closely linked to selection for large R 0 so that evolution tends to maximize LRS in a stable environment. Consequently, different quantities (r 0 and R 0 ) … feedback pluraleWebK-selected species have traits that are advantageous at high population densities. These species tend to have long lives, thrive under stable conditions, be large in size, produce … feedback portal