Delayed density dependence

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In population ecology delayed density dependence describes a situation in which population growth is controlled by negative feedback that operates with time lag.

Video Delayed density dependence

Siklus populasi

Pending density dependence has been used by ecologists to explain the population cycle. Ecologists have failed to explain the population cycle on a regular basis for decades; pending density dependence can hold the answer. Here the population is allowed to rise above their normal capacity because there is a lag time until a negative feedback mechanism keeps the population back down. This effect has been used to explain the population cycle of lemmings rats, forest insects, as well as large mammalian population cycles such as widespread moose and wolves. Other cyclical causes of the population include cycling abiotic factors.

Maps Delayed density dependence

Cause

The cause of delayed density dependence varies in every situation. In lemming, food supply and predation are the most important factors causing delayed density dependence. Competition between stages of life is another cause. In some species of moth, the practice of egg cannibalism occurs when older moths eat eggs from their own species. This results in an imbalance in the population levels of the various generations that lead to delayed density dependence. Illness is another contributing factor. This delay is introduced because the time required for vulnerable individuals is sufficient to present in order for the disease to spread again. The delay in sexual maturity introduces a delayed delayed density in many instances. In this case there is density dependent density applied to the organism when they are sexually immature. When this generation reaches sexual maturity there are fewer offspring, continuing the pattern.

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Detection method

Autocorrelation is the main method by which delayed density dependence can be detected. The timing sequences are analyzed for repetitive patterns.

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See also

• Density-dependent inhibition
• Population cycles
• Population dynamics

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References

Source of the article : Wikipedia