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Conservation Success, Rewilding, and Ecotourism
IB DP ESS — Topic 3: Biodiversity and Conservation | HL Extension | Paper 1 & Paper 2A/2B
🎯 Learning Intentions By the end of this note, you will be able to:
- Define conservation success, rewilding, and ecotourism using IB-aligned ESS terminology.
- Evaluate the effectiveness of conservation strategies — including protected areas, captive breeding, and habitat restoration — using named real-world case studies.
- Explain the ecological rationale for rewilding, including the roles of keystone species and trophic cascades in restoring ecosystem function.
- Analyse the social, economic, and ecological trade-offs involved in rewilding projects using ESS analysis parameters: scale, perspectives, sustainability, and uncertainty.
- Describe the principles of ecotourism and the conditions under which it can support both biodiversity conservation and local community development.
- Discuss contrasting worldviews — ecocentric, technocentric, and anthropocentric — in relation to rewilding and ecotourism as conservation strategies.
- Evaluate the limitations and potential negative impacts of ecotourism, including greenwashing, habitat disturbance, and inequitable benefit distribution.
Real-World Context & Relevance
In 1995, wildlife managers released fourteen grey wolves ( Canis lupus ) into Yellowstone National Park, USA — a species absent from the ecosystem for over seventy years. Within a decade, the consequences rippled through the entire food web in ways that few had anticipated. Elk populations, previously unchecked, shifted their grazing behaviour to avoid open valleys where wolves could hunt. Vegetation recovered along riverbanks. Willows and aspens regrew. Beavers returned, building dams that altered hydrology. Songbird diversity increased. Even river channels narrowed and stabilised as root systems strengthened eroded banks. This cascade of ecological change, triggered by the reintroduction of a single predator, became one of the most cited examples of a trophic cascade in modern conservation biology (Ripple et al., "Wolves and the Ecology of Fear").
Meanwhile, on the other side of the world, the mountain gorilla ( Gorilla beringei beringei ) population of the Virunga Massif — straddling Rwanda, Uganda, and the Democratic Republic of Congo — had fallen to fewer than 250 individuals by the 1980s. By 2018, following decades of intensive protection, anti-poaching patrols, and carefully managed ecotourism, the population had grown to over 1,000 individuals, prompting the IUCN to downlist the subspecies from Critically Endangered to Endangered (IUCN Red List, 2018). These two stories — one about restoring ecological processes, the other about protecting a flagship species while generating revenue for local communities — illustrate the central tensions and possibilities of modern conservation: how do we reverse biodiversity loss, who pays for it, and who benefits?
🌍 Why This Matters The IPBES Global Assessment (2019) estimated that approximately one million species face extinction, many within decades. Conservation strategies — from rewilding to ecotourism — represent humanity's most direct interventions in this crisis. Understanding when these strategies work, when they fail, and who they serve is essential for designing equitable, effective, and ecologically sound responses to the biodiversity emergency.
Core Concepts & Definitions
Conservation biology has shifted significantly over the past three decades. Early approaches focused primarily on protecting individual species or preventing habitat loss within fixed boundaries. More recent thinking recognises that species cannot be sustained in isolation from the ecological processes that support them — nutrient cycling, predator-prey dynamics, disturbance regimes, and