What are the three population distribution patterns?
The individual organisms that make up a population can be more or less equally spaced, dispersed randomly with no predictable pattern, or clustered in groups. These are known as uniform, random, and clumped dispersion patterns, respectively.
What are four methods of determining population size?
The four factors that determine population size are birth rate death rate emigration and immigration.
What are 3 density dependent factors and how do they work to control the size of a population?
Density-dependent factors include disease, competition, and predation. Density-dependant factors can have either a positive or a negative correlation to population size. With a positive relationship, these limiting factors increase with the size of the population and limit growth as population size increases.
What is clumped dispersion?
Clumped dispersion (Figure 1) where individuals are aggregated in certain areas of the sampled space. Uniform dispersion (Figure 2), where individuals are almost equally spaced apart from each other and random dispersion (Figure 3). Figure 2: Uniform dispersion of individuals.
What is the most accurate way to determine population size?
The most accurate way to determine population size is to simply count all of the individuals within the habitat. However, this method is often not logistically or economically feasible, especially when studying large habitats.
What is the difference between clumped random and uniform dispersion?
Clumped dispersion is when individuals in a population are clustered together, creating some patches with many individuals and some patches with no individuals. In uniform dispersion, individuals are spaced evenly throughout an area. And in random dispersion, individuals are arranged without any apparent pattern.
What is aggregated dispersion?
Aggregated dispersion (also called a contagious or clumped distribution or underdispersion) occurs either when individuals tend to be attracted to (or are more likely to survive in) particular parts of the environment, or when the presence of one individual.
What are the 3 methods of calculating population density?
The three methods for calculating population density are arithmetic, physiological and agricultural. The method used to calculate population density reveals different information about the pressure the population exerts on the land.
What are 5 density-dependent factors?
Density-dependent factors include competition, predation, parasitism and disease.
- Competition. Habitats are limited by space and resource availability, and can only support up to a certain number of organisms before reaching their carrying capacity.
- Predation.
- Parasitism.
- Disease.