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WebJan 7, 2024 · R- vs K-Selected Species In terms of population growth, organisms may be described as either r-selected or K-selected. R-selected species are things like the cockroach. They're... WebSummary. This paper catalogues several different dichotomies that have all been termed r- and K-selection. The status of the concept of r- and K-selection is discussed and a more restricted usage of the terms is recommended. Download to read the full article text. how is silver purified
45.3B: Theories of Life History - Biology LibreTexts
WebDifference between R and K selection The r selected species live in populations that are highly variable. The fittest individuals in these environments have many offspring and reproduce early. In K selected species, population size are often small, and therefore, individuals run a high risk of inbreeding. 4. 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 … 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 how is silver priced