Question

1. describe three advantages an individual organism might have by living in a population with a clumped dispersal pattern.
2. why might exponential growth occur only for a short period when a new species is introduced to a resource - filled environment?
3. how might a population crash be related to resource availability in the environment or the carrying capacity of the ecosystem?

Explanation:

Question 8

• Increased protection from predators: Clumped organisms can better detect and defend against predators. For example, a group of meerkats can take turns watching for predators while others forage.
• Enhanced resource acquisition: They can share information about food sources. Bees in a hive communicate the location of nectar-rich flowers.
• Improved mating opportunities: Higher density in clumps increases the chance of finding a mate. In a school of fish, there are more potential partners.

• Limited resources over time: Even in a resource - filled environment initially, as the population grows (due to exponential growth which is \(N_t = N_0e^{rt}\), where \(N_t\) is the population at time \(t\), \(N_0\) is the initial population, \(r\) is the growth rate, and \(e\) is the base of the natural logarithm), resources like food, water, and space become limited.
• Accumulation of waste: The species produces waste. For example, bacteria in a culture produce metabolic by - products that can be toxic at high concentrations.
• Emergence of competition: Intra - specific competition (competition within the species) increases. As more individuals compete for the same resources, the growth rate \(r\) in the exponential growth formula starts to decrease.

• Resource depletion: If a population over - utilizes resources (e.g., a herbivore population eats all the available plants), the lack of food (a key resource) can lead to starvation and a population crash.
• Carrying capacity concept: The carrying capacity (\(K\)) of an ecosystem is the maximum number of individuals it can support. When the population (\(N\)) exceeds \(K\) (due to over - consumption of resources like nesting sites for birds), there is a population crash as the ecosystem can no longer support the number of individuals.
• Resource - population balance: Resources (e.g., water for a frog population) are necessary for survival, growth, and reproduction. A sudden decrease in water availability (due to drought) can cause the frog population to crash as they cannot survive without sufficient water.

Answer:

• Increased protection from predators.
• Enhanced resource acquisition.
• Improved mating opportunities.

Question 9