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IB DP ESS — Topic 3: Biodiversity and Conservation | SL & HL | Paper 1 & Paper 2
🎯 Learning Intentions By the end of this note, you will be able to:
- Define in situ and ex situ conservation, distinguishing clearly between the two approaches using IB-aligned ESS terminology.
- Explain how protected areas function as in situ conservation tools, including the role of size, connectivity, and management in determining their effectiveness.
- Describe the range of ex situ conservation methods — including seed banks, captive breeding programmes, and botanical gardens — and the contexts in which each is most appropriate.
- Evaluate the relative strengths and limitations of in situ and ex situ conservation strategies, applying ESS analysis parameters including scale, sustainability, trade-offs, and multiple perspectives.
- Analyse real-world conservation case studies — including the Svalbard Global Seed Vault, the Arabian oryx reintroduction, and the Yellowstone wolf reintroduction — to assess the effectiveness of conservation interventions.
- Discuss contrasting worldviews (ecocentric, technocentric, anthropocentric) in relation to conservation priorities and the ethical tensions inherent in deciding which species or habitats to protect.
- Evaluate the role of international agreements such as the Convention on Biological Diversity (CBD) and the Kunming-Montreal Global Biodiversity Framework in supporting conservation strategies globally.
Real-World Context & Relevance
On 26 February 2008, a convoy of trucks wound its way through a blizzard on the Norwegian island of Spitsbergen, deep inside the Arctic Circle, carrying 268,000 seed samples from 100 countries. The destination was a newly completed vault carved 120 metres into a sandstone mountain — the Svalbard Global Seed Vault. Designed to withstand earthquakes, nuclear strikes, and rising sea levels, the vault now holds over 1.3 million seed varieties representing nearly every food crop known to humanity. Its existence is a direct response to an accelerating extinction crisis: the IPBES Global Assessment (2019) estimated that approximately one million plant and animal species are currently threatened with extinction, many within decades.
Yet the Svalbard vault, extraordinary as it is, cannot save a forest. It cannot maintain the soil mycorrhizal networks, the pollinator communities, or the predator–prey dynamics that allow species to function within living ecosystems. This tension — between preserving genetic material in controlled conditions and protecting the living systems within which species evolved — sits at the heart of conservation biology. The two broad approaches, in situ (on-site, within the natural habitat) and ex situ (off-site, outside the natural habitat), are not competitors but complementary tools. Understanding when, where, and how to deploy each is one of the defining challenges of twenty-first-century environmental management.
🌍 Why This Matters Biodiversity loss is occurring at rates estimated to be 100–1,000 times the natural background extinction rate (IPBES, 2019). Conservation strategies — both in situ and ex situ — represent humanity's primary toolkit for slowing or reversing this loss. The choices made about which strategies to fund, where to establish protected areas, and which species to prioritise in captive breeding reflect deep value judgments about the relationship between human societies and the natural world.
Core Concepts & Definitions
Before we can evaluate conservation strategies, we need to understand what we are trying to conserve and why location matters. A species does not exist in isolation — it is embedded in a web of ecological relationships: predator–prey dynamics, pollination networks, seed dispersal mutualisms, and competitive interactions. Removing a species