BIODIVERSITY LOSS: WHY SPECIES MATTER
Biodiversity refers to the variety of living organisms found within ecosystems, including plants, animals, fungi and microorganisms, as well as the genetic diversity within species. Healthy ecosystems depend not only on the number of species they contain but also on the complex relationships that exist between them. Scientists generally agree that biodiversity contributes to ecosystem stability and resilience, although they continue to investigate how different species perform particular ecological roles.
Over recent decades, researchers have reported declines in biodiversity across many regions of the world. Habitat destruction, climate change, pollution, overexploitation of natural resources and the introduction of invasive species have all been identified as important drivers of biodiversity loss. However, the relative importance of these factors varies among ecosystems, and scientists caution against assuming that a single cause explains every decline.
Habitat fragmentation presents a particular challenge for wildlife. When large natural habitats are divided into smaller isolated areas by roads, agriculture or urban development, some species experience greater difficulty finding food, mates or suitable breeding sites. Nevertheless, certain adaptable species are capable of surviving in modified environments, while others are far more sensitive to habitat change.
The loss of biodiversity may affect ecosystem services that humans depend upon. Pollination, nutrient cycling, water purification and soil formation all rely on interactions among living organisms. Scientists suggest that ecosystems containing a greater diversity of species may be better able to recover from environmental disturbances. Even so, researchers continue to investigate the extent to which biodiversity influences long-term ecosystem resilience under different environmental conditions.
Conservation efforts include habitat restoration, protected areas, sustainable resource management and the control of invasive species. Scientists emphasise that conservation strategies are often most successful when they involve cooperation among governments, local communities, researchers and private organisations. They also acknowledge that conservation measures may need to be adapted as environmental conditions continue to change.
Despite significant scientific progress, many aspects of biodiversity remain poorly understood. Researchers continue to discover previously unknown species and investigate ecological interactions that have not yet been fully explained.
Questions 1–12
Do the following statements agree with the information given in the passage?
Write:
TRUE
FALSE
NOT GIVEN
1. Scientists have identified a single cause responsible for biodiversity loss worldwide.
2. Habitat destruction is one factor contributing to biodiversity loss.
3. Climate change has caused more biodiversity loss than habitat destruction.
4. Habitat fragmentation may make it harder for some animals to find breeding sites.
5. Every species responds to habitat fragmentation in the same way.
6. Most invasive species are introduced accidentally by humans.
7. Biodiversity contributes to ecological processes such as pollination and soil formation.
8. Protected areas alone are sufficient to conserve biodiversity.
9. The majority of undiscovered species live in tropical rainforests.
10. Scientists continue to discover species that were previously unknown.
11. Researchers completely understand every ecological interaction within ecosystems.
12. The first national park established for biodiversity conservation was created in the nineteenth century.
Summary
This IELTS reading passage explores the importance of biodiversity and why every species plays a vital role in maintaining healthy ecosystems. It explains how biodiversity supports ecosystem stability, pollination, nutrient cycling, water purification, and soil formation. The passage examines the major causes of biodiversity loss, including habitat destruction, climate change, pollution, overexploitation, invasive species, and habitat fragmentation. It also highlights conservation strategies such as habitat restoration, protected areas, sustainable resource management, and community cooperation, while emphasizing that scientists are still discovering new species and studying complex ecological relationships. Twelve True, False, and Not Given questions are included to help learners strengthen their IELTS reading comprehension, vocabulary, and analytical skills.