Respuesta :
r-strategists are small species, with high reproductive rates and poor parental care. K-strategists are big-sized species, with low reproductive rates and good parental care. When N>K, the population decreases because there are not enough resources to survive.
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Species have different strategies to survive in different environments, reproduce, disperse, and compete.
These strategies are r strategies and k strategies.
r-strategist organisms
- r-species have a high growth rate per capita and low competition capabilities.
- They can colonize new environments. However, as they are not good competitors, they are often displaced by k-species.
- r-species are mostly small-sized organisms with short life cycles. They reach sexual maturity early and have numerous descendants spending no time or energy in parental care.
k-strategist
- k-species have a lower growth rate per capita in comparison with r species.
- They take advantage of their strong competition ability. They manage to displace other species and monopolize the available resources.
- These are big-sized species that live for a long time, reaching sexual maturity in the advanced stages of their lives.
- They use to have a reduced number of descendants, but spend a good time in parenting.
Carrying Capacity
A growing population that inhabits a limited space is gradually affected by density, rebounding in the multiplication rate.
The population growth per capita rate decreases as population size increases.
The population reaches a maximum point delimited by available resources, such as food or space. This point is known as the carrying capacity, K.
Carrying capacity refers to the maximum point at which the environment can support a growing population.
K is a constant. It coincides with the population size when natality rate and mortality rate are equal to each other. This is the equilibrium point.
- If the population size, N, is inferior to K (N still grow.
- When N approximates to K, the population´s growth speed decreases.
- When N=K, the population reaches equilibrium,
- When N is superior to K (N>K), the population must decrease in size because there are not enough resources to maintain that size.
So when the population size exceeds K, carrying capacity makes the population decrease in size. This is because there are not enough resources for this population to survive.
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You can learn more about carrying capacity at
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The reproductive strategy is dependent on the stability of the environment and resources. R-strategists reproduce quickly when resources are plentiful and have many offspring. K-strategists have a stable environment, produce only a few offspring at a time, and care for the young after birth.
The carrying capacity is the number of individuals that an ecosystem can support. The carrying capacity in an ecosystem is determined by the supply of resources for a population. When a population increases and reaches the carrying capacity, resources become limited. Disease and starvation increase the death rate. When the death rate is higher than the birth rate, the population decreases.
Explanation:
Penn Foster
