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BT101 BT101 Ecology, Biodiversity & Evolution-I Assignment 1 Solution & Discussion Spring 2020
Solution:
Population growth
In biology or human geography, population growth is the increase in the number of individuals in a population. Many nations with rapid population growth have low standards of living, whereas many nations with low rates of population growth have high standards of living.
Types of population growth
- Exponential population growth
- Logistics population
Exponential population growth
Exponential Population Growth. When resources are unlimited, a population can experience exponential growth, where its size increases at a greater and greater rate. In exponential growth, the population’s growth rate increases over time, in proportion to the size of the population.
- Resources are abundant.
- Remarkable potential to increase in number
- Exponential addition in population size
- Population may grow exponentially to certain time
- Ultimately limited by resource availability
- Formula of exponential growth
dN/ dt = rN N= Population size r = intrinsic rate of natural increase.
Logistic population growth
Logistic population growth occurs when the growth rate decreases as the population reaches carrying capacity.
- Carrying capacity of environment affect population growth
- Environmental resistance
- Growth rate gets smaller as approaches the carrying capacity
- Formula
Exponential population growth vs. Logistic population growth
Exponential population growth |
Logistic population growth |
In exponential growth, a population's per capita (per individual) growth rate stays the same regardless of population size, making the population grow faster and faster as it gets larger |
In logistics growth, a population's per capita growth rate gets smaller and smaller as population size approaches a maximum imposed by limited resources in the environment, known as the carrying capacity (K) |
In nature, populations may grow exponentially for some period, but they will ultimately be limited by resource availability. It accurse when resources are abundant. |
It accurse when resources are limited |
It produced j shaped curve |
It produce s shaped curve |
It has two phases lag and log |
It has four phases lag, log, declaration and steady |
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