What Is The Difference Between A K And R Strategist Species Quizlet?

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 birds R or K strategists?

K-selected species are characterized by long gestation periods lasting several months, slow maturation (and thus extended parental care), and long life spans. … Examples of K-selected species include birds, larger mammals (such as elephants, horses, and primates), and larger plants.

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.

Which of the following best describes a keystone species?

The definition of keystone species is a species on which other species in an ecosystem largely depend, such that if it were removed, the ecosystem would change drastically.

Are invasive species R or K-selected?

Biologists characterize most invasive species as r-selected. … While K-selected species exhibit low mortality, the majority of an r-selected species’ offspring are sure to perish; however, a few are likely to navigate the world successfully, mature and reproduce.

What is the difference between R vs K selection quizlet?

K selection has a low number of offspring and a long life span; R selection has a higher number of offspring and short life span.

What is an R strategist species?

R-selected species, also called r-strategist, species whose populations are governed by their biotic potential (maximum reproductive capacity, r). … Wilson; K-selected species—that is, species whose population sizes fluctuate at or near their carrying capacity (K)—make up the second strategy.

Are humans R or K?

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.

Are K-selected species generalists or specialists?

When environmental conditions change, generalists are able to adapt, but specialists tend to fall victim to extinction much more easily. K-Selected species are species that have a low intrinsic growth rate, which causes the population to increase slowly until it reaches the carrying capacity of the environment.

What is an R-selected species give an example?

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 r selected species quizlet?

Growth pattern in which the individuals in a population reproduce at a constant rate. … 1 Know that species with high reproductive effort, short life, and many offspring are more common in early succession or disturbed communities (r-selected).

Are Lions K-selected?

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

Are Snakes r-selected species?

Despite having characteristics of both R and K strategists, Eastern Milk Snakes are R strategists. Mainly because of the fact that they do not care for their young, but also because the baby snakes mature fairly quickly.

What is the difference between R and K selective provide an example of AK specialist species and an R specialist species find examples outside the textbook what kind of environment would favor each and why?

The difference between R and K selective is the R selected species live in populations that are highly variable. K selected species live in populations that are at or near equilibrium for long periods of times. An example of a K selective species would be a Lion or Bear and a R selective species would be a fish.

What does R stand for in r-selected species?

A whale tends for a single calf. r-selection: On one extreme are the species that are highly r-selected. r is for reproduction. Such a species puts only a small investment of resources into each offspring, but produces many such low effort babies.

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 is r at carrying capacity?

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 are characteristics of R selected populations quizlet?

Terms in this set (18)small body size. … short lived. … reproduce rapidly with usually many offspring. … very little parental care. … able to disperse rapidly and colonise new habitats. … population size very variable. … low competitive ability – unlikely to become dominant.More items…

What is the difference between a K and R strategist species?

The r selected species live in populations that are highly variable. The fittest individuals in these environments have many offspring and reproduce early. … K selected species tend to have fewer offspring, so their populations cannot recover as fast from a disturbance such as over hunting or fire.

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.

Why are r-selected species opportunists?

Why do r-selected species tend to be opportunists? They reproduce and disperse rapidly when conditions are favorable or when disturbance opens up and a new habitat or niche for invasion. … They tend to reproduce later in life and have a small number of offspring with fairly long life spans.