Explanation: Species designated as K-strategists thrive through longevity and have a higher survival rate at birth, but produce far fewer offspring. Examples include elephants and whales.
What characteristics do K-strategists have?
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.
What is an K strategist species?
K-selected species, also called K-strategist, species whose populations fluctuate at or near the carrying capacity (K) of the environment in which they reside. … K-selected species are characterized by long gestation periods lasting several months, slow maturation (and thus extended parental care), and long life spans.
What is a characteristic of 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.
What are the general descriptions of R strategists K-strategists?
Characteristics of r- and K-selected organisms | |
---|---|
r-organisms | K-organisms |
have large litters | have small litters |
reproduce at an early age | reproduce at a late age |
fast maturation | slow maturation |
What are examples of K-strategists?
- Occasional breeding.
- Longer gestation periods and give birth to one or two offspring at a time.
- Offspring take time to grow, and do so under the constant care and supervision of their parents.
Are plants R or K strategists?
For example, elephants are highly K-selected, whereas mice are much more r-selected. Among the fishes, most, like the salmon, are r-selected. … Even plants are capable of r- and K-selected reproductive strategies.
What is the difference between r strategists 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.
Are dogs K 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 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.
What is type2 survivorship?
Populations with Type II survivorship have a constant proportion of individuals dying over time. … For example, the type II curve has a constant proportion of individuals dying each time period. Starting with 1,000 individuals, in the first time period if 40% survive, then only 400 will be left.
What are K-selected plant species?
K-selection species are defined as those present in stable and predictable environments that produce fewer offspring, have longer gestation periods, and provide long-term care after birth.
Are K-selected species density dependent?
Whereas density-independent factors limit r-selected species in unpredictable environments, K-selected species are adapted to stable environments and regulated by density-dependent factors.
Which of the following is generally true of K strategist species as compared to R strategist species?
Which of the following is generally true of K-strategist species as compared to r-strategist species? They have longer life spans.
Which description is a characteristic of R selection strategy?
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.
What are characteristics of r-selected populations quizlet?
r-selected species tend to be small, have many offspring, expend or invest minimal energy for each offspring, mature early, have short life spans, and may reproduce only once in their lifetime.
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.
Which of the following organism is a strategist?
Insects produce a large number of offsprings and fall in the category of r strategist. Thus, the correct answer is B, Insects.
Are song sparrows R or K-strategists?
Song sparrows reproduce multiple times in a year and have limited parental care, traits of r-strategists. Generalists can live in a variety of habitats and have diverse diets.
What is mutualism in science?
Mutualism is a type of symbiotic relationship where all species involved benefit from their interactions. … In some cases, the species are entirely dependent on each other (obligate mutualism) and in others, they derive benefits from their relationship but could survive without each other (facultative mutualism).
Are ants R or K-selected?
The strategy for R-selected organisms includes producing a lot of offspring, producing them often, and having a relatively short lifespan. … Many insects are r-selected. For example, ants can be considered r-selected. Plants such as dandelions are another good example of an r-selected species.
What kind of species R strategists or K strategists do think would be most sensitive to habitat fragmentation and why?
Apex predators would be most affected because as fragmentation occurs, they lose control of small predators they hunt to survive.
Are K strategists density dependent?
Explanation: 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.
What are the differences between r-selected and K-selected species?
R-selected species tend to be small, produce few offspring, invest little care in their young, and display high juvenile mortality rates. K-selected species tend to be large, live longer lives, produce few offspring, invest a lot of time and energy into each offspring, and have lower juvenile mortality rates.
Are chickens R or K-selected?
Generally, the animals that are found acceptable by society to eat today are essentially K-strategists. These include meat coming from cows, swine, goat, chicken, among others. The last one, however, appears to lean on the r-strategists because of their short life span.
Why are endangered species K-selected?
Endangered species are likely to be K-selected species because they produce fewer offspring and breed less frequently. They also have a later reproductive age and a low population growth rate.
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 species?
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.
What is a Type 3 organism?
The Type III curve, characteristic of small mammals, fishes, and invertebrates, is the opposite: it describes organisms with a high death rate (or low survivorship rate) immediately following birth.
What is a Type 1 survivorship curve?
life tables. In survivorship curve. The Type I curve, illustrated by the large mammals, tracks organisms that tend to live long lives (low death rate and high survivorship rate); toward the end of their life expectancies, however, there is a dramatic increase in the death rate.
What are the 3 survivorship curves?
There are three types of survivorship curves. Type I curves depict individuals that have a high probability of surviving to adulthood. Type II curves depict individuals whose chance of survival is independent of age. Type III curves depict individuals that mostly die in the early stages of their life.
Why do K-selected species have long term parenting?
Why do K-selected species have long term parenting? Populations of K-selected species tend to exist close to their carrying capacity (hence the term K-selected) where intraspecific competition is high. These species produce few offspring, have a long gestation period, and often give long-term care to their offspring.
What are density-dependent and density-independent factors?
Density-dependent factors have varying impacts according to population size. Different species populations in the same ecosystem will be affected differently. Factors include: food availability, predator density and disease risk. Density-independent factors are not influenced by a species population size.
What happens when a species reaches carrying capacity in a community?
In an ecosystem, the population of a species will increase until reaches the carrying capacity. … If a population exceeds carrying capacity, the ecosystem may become unsuitable for the species to survive. If the population exceeds the carrying capacity for a long period of time, resources may be completely depleted.
What are density-dependent three examples?
- Competition within the population. When a population reaches a high density, there are more individuals trying to use the same quantity of resources. …
- Predation. …
- Disease and parasites. …
- Waste accumulation.
https://youtube.com/watch?v=JYjRdVQc4Cc
Which is true about a population’s carrying capacity?
Carrying capacity can be defined as a species’ average population size in a particular habitat. The species population size is limited by environmental factors like adequate food, shelter, water, and mates. If these needs are not met, the population will decrease until the resource rebounds.