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The r/K dichotomy can be re-expressed as a continuous spectrum using the economic concept of discounted future returns, with r-selection corresponding to large discount rates and K-selection corresponding to small discount rates.In areas of major ecological disruption or sterilisation (such as after a major volcanic eruption, as at Krakatoa or Mount Saint Helens), r- and K-strategists play distinct roles in the ecological succession that regenerates the ecosystem.BEIRUT, Dec 7 (Reuters) - Syrian President Bashar al-Assad's negotiating team is set to arrive in Geneva on Sunday to participate in peace talks, Syria's state news agency SANA reported on Thursday, quoting a foreign ministry source.The delegation, led by Bashar al-Ja'afari, walked out last week and returned to Damascus.In reproduction, however, trees typically produce thousands of offspring and disperse them widely, traits characteristic of r-strategists.
The talks began last week and after a few days with little apparent progress, the U. mediator Staffan de Mistura said that the government delegation was returning to Damascus to "consult and refresh". offices in Geneva on Wednesday morning to resume talks with de Mistura.
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 theory was popular in the 1970s and 1980s, when it was used as a heuristic device, but lost importance in the early 1990s, when it was criticized by several empirical studies.
The focus upon either increased quantity of offspring at the expense of individual parental investment of r-strategists, or reduced quantity of offspring with a corresponding increased parental investment of K-strategists, varies widely, seemingly to promote success in particular environments. where N is the population, r is the maximum growth rate, K is the carrying capacity of the local environment, and d N/dt denotes the derivative of N with respect to time t.
The distinguishing feature of the r- and K-selection paradigm was the focus on density-dependent selection as the important agent of selection on organisms’ life histories.
This paradigm was challenged as it became clear that other factors, such as age-specific mortality, could provide a more mechanistic causative link between an environment and an optimal life history (Wilbur et al.
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Eventually a new equilibrium is approached (sometimes referred to as a climax community), with r-strategists gradually being replaced by K-strategists which are more competitive and better adapted to the emerging micro-environmental characteristics of the landscape. Rushton's work resulted in him developing "differential k theory" to attempt to explain many variations in human behavior across geographic areas, a theory which has been criticized by many other researchers.