Ecosystem loss is driven by habitat conversion, fragmentation, climate stress, acidification, pollution, and resource extraction that reduce species survival worldwide.
Coverage 2023–2025 · Updated 15 Jul 2026
Ecosystem loss is an anthropogenic reduction in habitat area, structure, species interactions or ecological function, caused directly by conversion or indirectly by environmental change.
| Ecosystem | Human drivers | Causal chain |
|---|---|---|
| Mixed dipterocarp forest, Borneo | Logging and conversion to oil-palm plantations | Tree removal and land conversion → fragmentation and altered microclimate → habitat and species loss |
| Great Barrier Reef | Greenhouse-gas-driven warming and acidification, pollution and fishing pressure | Heat stress/bleaching and reduced calcification plus local stress → coral loss → reduced reef habitat and function |
Separate direct area loss from degradation of what remains. Fragmentation increases edge effects and isolates populations; persistent pollution, invasive species or climate stress can prevent functional recovery.
Satellite images showing declining Borneo forest cover become stronger causal evidence when land-use records independently show logging and oil-palm expansion in the same places and times.
Protecting a small remnant does not by itself restore an ecosystem if connectivity, species interactions or the original abiotic conditions remain lost.
This objective is assessed through multiple choice, structured response, commonly using Outline / Explain / Describe.
Outline / Explain / Describe / Suggest
Build the answer around this relationship: Deforestation reduces biodiversity by removing habitat and essential resources.
Naming deforestation without explaining loss of habitat, food, shelter or breeding sites.
Representative question
The satellite images show changes in the area covered by forest, much of which is mixed dipterocarp forest, on the island of Borneo in Southeast Asia.
Which human activities are most likely to have caused the changes shown in the map?
Logging and palm oil plantation
Logging and rewilding
Mining and afforestation
Afforestation and palm oil plantation
A strong conservation answer follows a chain: define biodiversity, measure evidence of decline, identify human drivers, then justify conservation action. Biodiversity includes ecosystem, species, and genetic diversity; species diversity uses richness and evenness. Evidence comes from estimates, fossils, repeated surveys, IPBES reports, and indices. Drivers include extinction pressure, ecosystem conversion, population-driven resource demand, pollution, and invasive species. Responses include in situ, ex situ, and EDGE prioritization.
