Table of Contents
What are the characteristics of an K-selected species?
K-selected species are characterized by long gestation periods lasting several months, slow maturation (and thus extended parental care), and long life spans. In addition, they tend to inhabit relatively stable biological communities, such as late-successional or climax forests (see ecological succession).
What is R and K-selected species?
R- and K-selection constrain the range of viable species through the colonization-competition tradeoff, with strong r-selection favoring colonizers and strong K-selection favoring competitors, but the level of disturbance also affects the success of species.
Which characteristic is typical of a K strategist?
Traits that are thought to be characteristic of K-selection include large body size, long life expectancy, and the production of fewer offspring, which often require extensive parental care until they mature. Organisms whose life history is subject to K-selection are often referred to as K-strategists or K-selected.
Which organisms best illustrates K-selection?
Which organisms best illustrates K-selection? Guppies from Trinidad form two distinct populations that differ in several life history traits. These traits appear to relate to the local predator populations, pike-cichlids or killifish.
What animals are r strategists?
Examples of r-strategist species are dogs, cats, insects, and fish.
Are turtles R or K-selected?
Similarly, reptiles such as sea turtles display both r- and K-traits: although large organisms with long lifespans (should they reach adulthood), they produce large numbers of unnurtured offspring.
Are Crocodiles K-selected?
Some reptiles, like alligators and crocodiles, are also K-selected, living for a long time and laying eggs multiple times. Some even provide early parental care over their eggs and offspring.
Are humans R strategists or K strategists?
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 dogs K or R strategists?
Cats and dogs are r-selected compared to humans, but K-selected compared to mice and rats. Mice and rats, in turn, are K-selected compared to most insects. We can think of an r-K selection continuum and an organism’s position along it in a particular environment at a given instant in time (Pianka 1970).
Are deer K-selected species?
White-tailed deer are a K- selected species and most insects are r-selected species. Population growth as described by the logistic model exhibits a characteristic “S” or sigmoid shape. The basic assumption of the model is that the rate of increase decreases as a linear function of population size.
Are gorillas K-selected species?
Examples of animals that pursue K strategies are gorillas and whales. The largest of the primates, gorillas require specialized diets (with distinct differences in the diets of mountain and lowland gorillas) and produce a single offspring once every three to four years.
Which of the following is a typical K-selected species adaptation?
Which of the following is a typical K-selected species’ adaptation? K-selected species have a low biotic potential but high survivorship in part because of extended care for their young.
Are salmon r-selected?
Among the fishes, most, like the salmon, are r-selected. Some species will even inadvertently eat their own young if they are not immediately dispersed, but a few species, such as the cichlids, are K-selected and provide prolonged care and protection of the eggs and hatchlings.
What are R species?
r-selected species, also called r-strategist, species whose populations are governed by their biotic potential (maximum reproductive capacity, r). Such species make up one of the two generalized life-history strategies posited by American ecologist Robert MacArthur and American biologist Edward O.
Are dandelions r-selected species?
Examples of r-selected species are marine invertebrates, such as jellyfish, and plants, such as the dandelion. Dandelions have small seeds that are dispersed long distances by wind; many seeds are produced simultaneously to ensure that at least some of them reach a hospitable environment.
Are humans Iteroparous?
Humans (Homo sapiens) are an example of iteroparous species – humans are biologically capable of having several offspring during their lives. Iteroparous vertebrates include birds, reptiles, fishes, and mammals (Angelini and Ghiara 1984).
Does K vary among populations?
Furthermore, as K varies temporally within populations, optimal harvest will likely also vary across time. Stronger density dependence in herds with smaller K resulted in less stochastic fluctuations in abundance than herds with larger K.
What is K in biology?
Potassium is the main intracellular ion for all types of cells, while having a major role in maintenance of fluid and electrolyte balance.
What is the difference between a K and R strategist species quizlet?
Identify differences between K- and r-selected species. K-selected species are typically more adversely affected by invasive species than r-selected species, which are minimally affected by invasive species. Most invasive species are r-selected species.
What is the difference between K strategist and R strategist?
r strategist is an organism living in unstable environments. Hence, they undergo rapid reproduction to stabilize themselves. Whereas, K strategist is an organism living in stable environments. Therefore, they are high in population and do not need to undergo rapid reproduction.