ecosystem
A community of living things and the environment they depend on.
ExampleThe passage explains how a fragile ecosystem can be damaged by tourism.
ExampleClimate change can affect the balance of an entire ecosystem.
Usage Scenarios
Reading for topic recognition
Use ecosystem to identify that a paragraph is about environmental relationships, not just one animal, plant, or landscape feature.
ExampleThe paragraph explains how one invasive species changed the whole ecosystem.
Understanding cause and effect
Use it when a change in one part affects the whole natural system, such as when pollution reduces fish numbers and then affects birds, plants, and local communities.
ExamplePollution in the river damaged the ecosystem and reduced fish populations.
Usage Guide
Recognize ecosystem when an IELTS passage discusses how living things interact with their surroundings. It often appears in texts about climate, biodiversity, tourism, agriculture, conservation, invasive species, and the effect of human activity on natural balance.
The safest chunks are fragile ecosystem, marine ecosystem, local ecosystem, restore an ecosystem, and damage an ecosystem. These phrases help you track whether the paragraph is about protection, pressure, recovery, or decline.
Do not treat ecosystem as only a place. It is a system of relationships between organisms and their environment, so IELTS questions may test causes, effects, and dependencies rather than a simple location.
Word Forms & Word Building
Ecosystem is a countable compound noun: an ecosystem, several ecosystems, or the ecosystem of a wetland.
Eco- points to ecology or environment, while system tells you the parts interact. That structure is why the word means more than a place.
Ecology is the study of these relationships, and ecological is the adjective in phrases such as ecological balance, ecological damage, and ecological pressure.
Meaning Boundaries
Ecosystem vs habitat
Habitat is the place where a species lives. Ecosystem is the wider network of living things, physical conditions, and relationships that may include many habitats.
Ecosystem vs environment
Environment is broader and can mean surroundings in general. Ecosystem emphasizes interaction among living and nonliving parts, so it often appears when the passage explains a chain of effects.
Register
Ecosystem is academic but common in IELTS reading and writing topics about nature and sustainability.
Memory Tricks
Think eco + system: nature working as connected parts, where a change in one part can affect the others.
Pair it with fragile, marine, local, restore, and damage because IELTS environment texts often use those contexts.
When reading, ask which parts of the system are connected: animals, plants, water, soil, climate, human activity, or tourism.
Common Traps
Do not use ecosystem for any organized group, such as a school or company, unless the context clearly uses it metaphorically.
Do not focus only on animals; an ecosystem includes plants, climate, water, soil, and other conditions.
In IELTS writing, explain the specific ecosystem, such as a reef, forest, wetland, or river, rather than using the word as a vague environmental label.