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Are Sea Turtles R Selected 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.
Are tortoises k-selected? Examples of organisms undergoing K-selection are tortoises, elephants, people, and sequoia trees: their offspring are few but long-lived. K-selection, therefore, is selection for increasing control over the environment, whereas r-selection is caused by an environment that is intrinsically difficult to control.
What species are both R and K-selected? Oak trees produce many offspring that do not receive parental care, but are considered K-selected species based on longevity and late maturation. (b) Dandelions and jellyfish are both considered r-selected species as they mature early, have short lifespans, and produce many offspring that receive no parental care.
What is an example of a 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. Examples of K-selected species include birds, larger mammals (such as elephants, horses, and primates), and larger plants.
Are Sea Turtles R Selected Or K Selected – Related Questions
Are fish K or 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.
Are Lions K-selected?
Common examples of k-strategists species include humans, lions and whales.
Why are oak trees K-selected species?
The tree’s height and size allow it to dominate other plants in the competition for sunlight, the oak’s primary energy resource. Furthermore, when it does reproduce, the oak produces large, energy-rich seeds that use their energy reserve to become quickly established (K-selection).
Are humans R 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.
What animals are r strategists?
Examples of K-strategists include large mammals such as deer, bears, elephants, etc. The r-strategy, by contrast, is used by many lizards, amphibians, fish, and small mammals, and it ensures species survival through quantity.
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 K-selected species opportunists?
Explanation: R-selected or opportunistic species are species that have high growth rates, produce many offspring, and have low survival odds for those many offspring. Examples of k-selected species include mammals such as humans, dolphins, and rhinos.
Are K-selected species generalists?
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.
Why are elephants k-selected?
Few offspring that take a long time to develop ensure that the population doesn’t grow too rapidly, exceed the carrying capacity, or outstrip the resources of the environment. Thus, the elephant is considered a K-selected species. Low offspring mortality. Relatively steady population size near the carrying capacity.
Who proposed the idea of R and K selection?
The theory of r- and K-selection was proposed and popularized by MacArthur and his colleagues in the 1960s and early 1970s (MacArthur 1962, 1972, Cody 1966, MacArthur and Wilson 1967, Pianka 1970). Mac- Arthur and Wilson (1967) envisioned an island, when first colonized, as having abundant resources.
Do r selected species live long?
The production of numerous small offspring followed by exponential population growth is the defining characteristic of r-selected species. They require short gestation periods, mature quickly (and thus require little or no parental care), and possess short life spans.
Why are r selected species opportunists?
Why do r-selected species tend to be opportunists
What is R and K selection and how do they differ?
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 live in populations that are at or near equilibrium conditions for long periods of time.
Are K strategists density dependent?
K-strategist populations are more commonly regulated by density-dependent limiting factors. Their population sizes hover around a carrying capacity that is dependent on factors that increase in severity with the density of the population.
Are trees r-selected?
Although some organisms are identified as primarily r- or K-strategists, the majority of organisms do not follow this pattern. For instance, trees have traits such as longevity and strong competitiveness that characterise them as K-strategists.
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.
Are dandelions R strategists?