Biodiversity is more than a collection of interesting or beautiful species. Humans depend on living organisms and healthy ecosystems, even when technology and modern lifestyles make that dependence less visible. This lesson introduces the practical consequences of biodiversity loss and explores how organisms contribute to human health.
Extinction is a normal part of macroevolution, the large-scale patterns of evolutionary change over long periods. The concern today is the accelerated rate of extinction: many species may disappear within a human lifetime. This loss can be practically important, even apart from its emotional or moral significance.
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Why does biodiversity matter practically to humans?
It supports ecosystem processes people depend on and provides organisms and compounds that can contribute to medicines.
What is a keystone species?
A species with an especially large influence on its ecosystem; its loss can cause substantial ecological change.
What are secondary plant compounds?
Chemicals plants often produce for defense; some may also have useful medicinal effects.
Which groups of organisms have provided compounds used in or studied for medicine?
Plants, fungi, bacteria, and animals; animal venoms and poisons have also inspired medical research.
How can extinction affect future medical discoveries?
Species may disappear before researchers discover whether their compounds could help develop treatments.
Quiz questions
What is the main role of the Svalbard Global Seed Vault in conserving crop diversity?Answer: It provides backup seed samples that can help replace lost collections.
What agricultural risk contributed to the Irish potato famine?Answer: Heavy reliance on a potato variety susceptible to potato blight.
How do pollinators support agricultural production?Answer: They enable many plants to reproduce and help produce numerous crops.
How can overharvesting affect a fishery even if the harvested species does not go extinct?Answer: It can reduce the species' abundance, reshape the ecosystem, and harm livelihoods.
What is one possible psychological benefit of contact with natural environments?Answer: It may support psychological well-being, although experiences can vary.
Based on Biology 2e by Mary Ann Clark, Matthew Douglas, Jung Choi (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.