Question: Why Do We Use The Symbols R And K For These Strategies?

What does R and K mean for 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 is an example of an R strategist?

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 are three traits of an R strategist?

Among the traits that are thought to characterize r-selection are high fecundity, small body size, early maturity onset, short generation time, and the ability to disperse offspring widely. Organisms whose life history is subject to r-selection are often referred to as r-strategists or r-selected.

Are turtles R or K-selected?

Plants such as dandelions are another good example of an r-selected species. … Sea turtles are a good example of a species that fits somewhere in the middle. The produce many eggs and do not care for their offspring once the eggs have been laid, but turtles live very long lives.

What does R mean in biology?

R group: An abbreviation for any group in which a carbon or hydrogen atom is attached to the rest of the molecule. … R is an abbreviation for radical, when the term radical applied to a portion of a complete molecule (not necessarily a free radical), such as a methyl group.

Are frogs K strategists?

Frogs produce many eggs, and a fraction live to reproduce themselves. They are an example of r-strategists. “r and K selection.” University of Miami: Department of Biology.

Are humans R strategist or K strategist and why?

Both across and within species, r and K strategists differ in a suite of correlated characteristics. Humans are the most K of all. K’s supposedly have a longer gestation period, a higher birthweight, a more delayed sexual maturation, a lower sex drive, and a longer life.

What is R and K reproductive strategy?

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.

What does R and K selection mean?

r-selection: On one extreme are the species that are highly r-selected. r is for reproduction. … K-selection: On the other extreme are species that are highly K-selected. K refers to the carrying capacity, and means that the babies are entering a competitive world, in a population at or near its carrying capacity.

Are Fish R strategists?

R strategists usually create an abundance of offspring in the hopes that a few will make it. include bacteria, insects, and fish. lessons from their parents. K-selected species include elephants, apes and whales.

Are Lions R or K-selected?

Common examples of k-strategists species include humans, lions and whales.

Why are humans K-selected species?

K-selected species possess relatively stable populations fluctuating near the carrying capacity of the environment. These species are characterized by having only a few offspring but investing high amounts of parental care. Elephants, humans, and bison are all k-selected species.

Are dogs K or R strategists?

Indeed, one can think of a given organism as an “r-strategist” or a “K-strategist” only relative to some other organism; thus statements about r and K selection are invariably comparative. Cats and dogs are r-selected compared to humans, but K-selected compared to mice and rats.

Why are rabbits r selected species?

So this begs the question are rabbits truly prolific, and why? In Page 2 the 1960s two ecologists came up with r/K selection theory. It relates to parental investment and reproductive strategies adopted by species in order to advance its kind into the future. … And they have the ability to reproduce rapidly.

What are the differences between R and K strategists?

The key difference between r strategist and K strategist is that the r strategist lives in unstable and unpredictable environments while the K strategist lives in more stable environment. Because of this environmental conditions, the r strategists produce many offspring while the K strategists produce few offsprings.