In situ conservation is the protection of species and ecosystems in their natural habitats, where they live and evolve. The Convention on Biological Diversity defines it as “the conservation of ecosystems and natural habitats and the maintenance and recovery of viable populations of species in their natural surroundings.” National parks, wildlife reserves, marine protected areas, and even traditional farmlands where heritage crop varieties still grow all count as forms of in situ conservation.
Why Protecting Species Where They Live Matters
The core advantage of in situ conservation is that it keeps species embedded in the environments that shaped them. Wild populations face changing weather, new diseases, shifting competitors, and evolving predators. That constant pressure generates new genetic variation and preserves rare gene variants that could prove valuable in the future. Populations conserved in their natural surroundings continue adapting in real time.
This stands in sharp contrast to ex situ methods like seed banks, botanical gardens, and zoos. Those collections are essentially frozen snapshots: the genetic material stored in them stops evolving the moment it’s collected. A seed vault can safeguard thousands of crop varieties against disaster, but it can’t produce the new adaptive combinations that arise when plants keep growing, reproducing, and responding to their environment season after season.
In situ conservation also protects entire ecosystems, not just individual species. A protected forest doesn’t just shelter its trees. It maintains the soil organisms, pollinators, fungi, and water cycles that all depend on each other. Those ecosystem services, including carbon storage, water filtration, flood control, and pollination, have enormous economic value. The Ecosystem Services Valuation Database now contains over 9,400 monetary estimates from more than 1,300 studies, covering services from recreation to climate regulation across 15 major land and ocean biome types.
How It Works in Practice
The most familiar form of in situ conservation is the protected area: a national park, nature reserve, or marine sanctuary with some level of legal protection against development, hunting, or resource extraction. But protection on paper is only the starting point. Effective conservation requires active management: monitoring species, controlling invasive pests, restoring degraded habitat, and sometimes reintroducing individuals to bolster struggling populations.
For wild relatives of food crops, conservation often takes the form of designated genetic reserves. Scientists use geographic and ecological surveys to identify where the most genetically diverse populations exist, then prioritize those sites for protection. Increasingly, genomic sequencing helps pinpoint which populations carry important adaptive traits like drought tolerance or disease resistance, making it possible to target conservation efforts where they’ll preserve the most useful genetic diversity at the lowest cost.
On-farm conservation is another important branch. When traditional farmers continue growing heritage varieties of wheat, rice, maize, or other crops using local methods, they maintain genetic diversity that commercial agriculture has largely abandoned. The Convention on Biological Diversity specifically recognizes this, extending the definition of in situ conservation to include domesticated species “in the surroundings where they have developed their distinctive properties.” These farmer-maintained varieties keep evolving under both natural and human selection pressures, generating new trait combinations that plant breeders may need in the future.
The Role of Local Communities
Conservation outcomes improve significantly when local and Indigenous communities are involved in managing their own lands. A large-scale analysis of community-based conservation projects found that over 80% produced some positive outcome for either human well-being or the environment. However, only 32% achieved positive results for both people and nature simultaneously, highlighting how difficult it is to balance these goals.
The projects most likely to succeed on both fronts shared a few characteristics. They operated in countries with stronger environmental democracy and political stability. They offered communities economic diversification, such as alternative livelihoods that reduced pressure on natural resources. Training and technical assistance also made a measurable difference. Interestingly, projects that openly acknowledged conflict or trust issues between communities and conservation authorities were more likely to succeed than those that didn’t, suggesting that honest engagement matters more than avoiding difficult conversations.
How Much of the Planet Is Currently Protected
As of the most recent Protected Planet Report in 2024, 17.6% of the world’s land and inland waters fall within documented protected or conserved areas. Ocean coverage lags behind at 8.4% of coastal and marine areas. These numbers represent real progress over the past few decades, but they fall well short of the targets the international community has set.
In December 2022, nearly 200 countries adopted the Kunming-Montreal Global Biodiversity Framework, which commits the world to protecting 30% of land and 30% of oceans by 2030. This “30 by 30” target means protected land area needs to roughly double and marine protection needs to roughly triple within the decade. Meeting that goal will require not just drawing new boundaries on maps but ensuring that existing and new protected areas are actually managed effectively.
Challenges and Limitations
Not all protected areas deliver real conservation results. Some are “paper parks,” areas that exist in legislation but lack the funding, staffing, or enforcement to stop poaching, logging, or encroachment. Evaluating whether a protected area actually works requires comparing what happens inside its boundaries against what would have happened without protection, a method known as counterfactual analysis. Most management assessments evaluate planning, resources, and processes but don’t systematically collect the comparison data needed to prove that protection caused the observed outcomes.
Political instability poses another serious threat. In situ conservation sites can be overrun by conflict, corruption, or sudden economic collapse. Climate change adds a layer of difficulty that is harder to manage. Species confined to mountaintops, small islands, or narrow habitat corridors may find their protected areas becoming uninhabitable as temperatures shift. The Florida torreya, an endangered conifer, illustrates this problem starkly. It’s a glacial relict stranded in a tiny range in northern Florida, unable to migrate back to the cooler Appalachian habitats it originally came from. For species like this, in situ conservation in their current range simply cannot work anymore.
Wildfires, invasive species, and habitat fragmentation compound these pressures. A single catastrophic fire season can undo decades of conservation investment at a site, as recent fire seasons in western North America and Australia have demonstrated.
How In Situ and Ex Situ Conservation Work Together
The most effective conservation strategies treat in situ and ex situ methods as complementary rather than competing. The Arabian oryx is a textbook example. The species went extinct in the wild but survived in zoos, where managed breeding programs maintained a viable population. Those captive-bred animals were eventually reintroduced to protected areas across the Arabian Peninsula, and wild numbers have been growing since. In Australia, zoos have reintroduced endangered bandicoots into areas guarded by trained dogs that keep foxes and feral cats away, and have bred helmeted honeyeaters that were taught to recognize predators before release.
These successes highlight a practical reality: ex situ programs serve as insurance policies and recovery tools, while in situ conservation provides the functioning habitat that species ultimately need to sustain themselves. Seed banks back up the genetic diversity maintained on farms. Zoo populations supply individuals for reintroduction into restored wild habitats. Neither approach alone is sufficient, but together they cover each other’s blind spots.