A population is the collection of inter-breeding organisms of a particular species. All the organisms of the same species living together that live in a specific ecosystem are called a population The individuals in the population compete with one another for food, nesting space, and mates. All of the populations of different species of animals and plants that live and interact together in an area is a community The different populations in a community depend on each other for food, shelter, and many other things. Each community depends on its environment. The nonliving, or abiotic, parts of an environment combine with the living, or biotic, things in a community to make up an ecosystem.
organisms and populations are co-related and plays a significant
role in the ecosystems.
RELATIONSHIPS BETWEEN POPULATIONS
Most common is the predator-prey relationship.
Predator is an animal that hunts and eats other animals.
The animal eaten by a predator is its prey. Examples: lion-zebra, bird-worm.
Parasitism is a relationship between two types of organisms in which one organism benefits while the other one is harmed. Parasite is an organism that lives in or on another organism and is harmful to that organism. The infected organism is the host. E.g Athlete’s foot -Parasite: fungus -Host: human’s foot. Other common examples are fleas, ticks, lice, and mosquitoes. These animals live off the blood of the host. The parasite doesn’t want to kill the host though. If the host dies, this normally results in the death of the parasite as well.
OTHER RELATIONSHIPS: - Commensalism: one organism benefits while the other is not affected. Examples: clown fish and sea anemone.
- Mutualism: both organisms benefit. Example: termite and protozoan in termite’s gut.
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