Conservation biology is the science of protecting biodiversity, ecosystems, and the natural processes that keep life on Earth functioning. It matters because species, habitats, and genetic diversity are being lost through habitat destruction, overharvesting, invasive species, pollution, climate change, and disease. Healthy ecosystems provide services such as clean water, pollination, flood control, soil formation, and carbon storage.
Conservation biology uses evidence from ecology, genetics, geography, and social science to decide where and how protection can be most effective.
A conservation plan often connects protected reserves, wildlife corridors, restoration sites, and human land uses into one working landscape. Corridors can reduce habitat fragmentation by allowing animals to move, find mates, and recolonize areas after local extinction. Captive breeding can help species with very small populations, but it must preserve genetic diversity and support reintroduction into suitable habitat.
Restoration ecology rebuilds damaged habitats by removing stressors, replanting native species, improving water flow, and monitoring recovery over time.
Key Facts
- Biodiversity includes species diversity, genetic diversity, and ecosystem diversity.
- Population growth can be modeled as dN/dt = rN for exponential growth when resources are not limiting.
- Logistic growth includes carrying capacity: dN/dt = rN(1 - N/K).
- A smaller, isolated population has a higher risk of inbreeding, genetic drift, and extinction.
- Species richness is the number of species in an area, while evenness describes how equal their abundances are.
- A wildlife corridor connects habitat patches and can increase gene flow, migration, and recolonization.
Vocabulary
- Biodiversity
- Biodiversity is the variety of life at the genetic, species, and ecosystem levels.
- Habitat fragmentation
- Habitat fragmentation is the breaking of large continuous habitat into smaller, isolated patches.
- Wildlife corridor
- A wildlife corridor is a strip or network of habitat that connects separated populations or habitat patches.
- Captive breeding
- Captive breeding is the controlled reproduction of threatened species in zoos, hatcheries, or conservation facilities to support population recovery.
- Restoration ecology
- Restoration ecology is the practice of helping damaged ecosystems recover their structure, species, and functions.
Common Mistakes to Avoid
- Assuming a protected area alone is always enough, because isolated reserves may still lose species if they are too small, poorly managed, or disconnected from other habitats.
- Ignoring genetic diversity, because a population with many individuals can still be at risk if most are closely related and have low variation.
- Treating all corridors as automatically helpful, because corridors must be placed and managed carefully to avoid spreading disease, invasive species, or human conflict.
- Counting only the number of species, because conservation decisions also depend on abundance, endemism, ecosystem roles, habitat quality, and threat level.
Practice Questions
- 1 A reserve contains 18 mammal species, 42 bird species, 9 reptile species, 6 amphibian species, and 25 plant species recorded in a survey. What is the total species richness recorded in the survey?
- 2 A fragmented forest has two habitat patches of 60 km2 and 25 km2. A restoration project adds a 15 km2 corridor and restores 20 km2 of degraded land next to the smaller patch. What is the new total connected habitat area?
- 3 A conservation team must choose between creating one large isolated reserve or a network of smaller reserves connected by corridors. Explain which option is likely to better support long-term biodiversity and why.