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What has to happen for a population to decrease?
A reduction over time in a region’s population can be caused by sudden adverse events such as outbursts of infectious disease, famine, and war or by long-term trends, for example sub-replacement fertility, persistently low birth rates, high mortality rates, and continued emigration.
What factors can cause an organism’s population to decrease?
In the natural world, limiting factors like the availability of food, water, shelter, and space can change animal and plant populations. Other limiting factors, like competition for resources, predation, and disease also impact populations.
What can affect an organism’s 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 would happen if the primary consumers population decreased?
Without the primary consumers there would be no source of energy for carnivores or secondary consumers so no secondary consumers would exist in that ecosystem. The producers would be the only organisms in the ecosystem, besides decomposers. The producers would likely over reproduce.
What causes population to increase and decrease?
The major factors affecting population are birth, death and migration. Birth increases the population while death decreases the population. Migration also causes population change. Internal migration does not make any changes but international migration makes the differences in the size of population.
When organisms move out of the population this is known as?
Emigration is the movement of individuals out of a population. This decreases the population size and growth rate.
What would happen if there is no limiting factor that affects the organism population?
Limiting factors determine the carrying capacity of a population. Recall that when there are no limiting factors, the population grows exponentially. In exponential growth (J-shaped curve, curve A: Figure below), as the population size increases, the growth rate also increases.
What do you think will happen if a certain population of an organism stops reproducing How will it affect balance in nature?
Living things are able to reproduce themselves. If organisms fail to do this, populations will diminish and disappear as their members die from old age, disease, accidents, predation, etc.
What would happen if an organism is removed from the food chain?
If an organism is removed from a food chain, it will disrupt the energy flow in the ecosystem. The organisms that depend on it will also die. The amount of disturbance will depend on the organism.
What role do microorganisms play in the ecosystem?
Microorganisms play a vital role in every ecological community by serving both as producers and as decomposers. Although plants are the most common primary producers, autotrophic photosynthetic microbes (such as cyanobacteria and algae) can harness light energy to generate organic matter.