r is for reproduction. Such a species puts only a small investment of resources into each offspring, but produces many such low effort babies. Such species are also generally not very invested in protecting or rearing these young. Often, the eggs are fertilized and then dispersed.
What does R mean in ecology?
An important concept in population ecology is the r/K selection theory. The first variable is r (the intrinsic rate of natural increase in population size, density independent) and the second variable is K (the carrying capacity of a population, density dependent). … Evolution favors productivity in r-selected species.
What does R represent in a population?
P is the initial population size. K is the carrying capacity of the environment. r is a constant representing population growth or decay.
What is R and K in population growth?
r, which is the growth rate of the population (how quickly or slowly it changes size) N, which is the number of individuals in that population; and finally. K, which is the carrying capacity, the maximum number of individuals that can be supported by the resources in a given area.
What are some r-selected species?
Typical examples of r-species are mice, rabbits, weeds and bacteria, which have a lot of offspring, but a short life expectancy. Examples of organisms undergoing K-selection are tortoises, elephants, people, and sequoia trees: their offspring are few but long-lived.
What is an R-strategist?
r-selected species, also called r-strategist, species whose populations are governed by their biotic potential (maximum reproductive capacity, r). … Unlike K-selected species, members of this group are capable of reproduction at a relatively young age; however, many offspring die before they reach reproductive age.
What is R and K-selected species?
r-selected babies grow rapidly, and tend to be found in less competitive, low quality environments. … K-selected species produce offspring that each have a higher probability of survival to maturity.
What does r represent in the logistic growth model?
Let r be the net per-capita growth rate of the population, i.e., r is the growth rate (due to births) minus the death rate. If r is positive, the growth rate is greater than the death rate; if it is negative, the death rate is larger.
How do you find R0 in ecology?
The net reproductive rate for a set cohort is obtained by multiplying the proportion of females surviving to each age (lx) by the average number of offspring produced at each age (mx) and then adding the products from all the age groups: R = Σlxmx.
Is r constant in exponential growth?
As we mentioned briefly above, we get exponential growth when r (the per capita rate of increase) for our population is positive and constant.
What is an R strategist and K strategist?
The r and K strategists are two types of organisms categories under the basis of r and K selection. r strategist is the organism living in unstable environments. On the contrary, K strategist lives in stable, predictable environments. Therefore, r strategist reproduces fast in order to ensure its survival.
What is meant by R vs K 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 habitat for members of a given sort of organism.
How do R and K selection influence survivorship curves?
How do survivorship curves relate to r selection and K selection in animals. Ans: Populations described as r selection have traits that contribute to a high population growth rate. … K selection maximizes the chance of surviving in an environment where the number of individuals is near the carrying capacity.