Madagascar holds a special place in the world of conservation. The island is home to exceptional biodiversity, characterized by a high concentration of species found nowhere else.
Lemurs, chameleons, amphibians, baobabs, orchids, reptiles, freshwater fish, and forest plants: many groups in Madagascar have particularly high levels of endemism.
This biological richness is the result of a long evolutionary history, the island’s geography, and the diversity of its natural environments. But it is also extremely vulnerable.
A scientific review published in Science describes Madagascar’s biodiversity as “unique” and “hyperdiverse,” while highlighting the intensity of the threats it currently faces.
So, what really makes Madagascar’s biodiversity so exceptional?
1. An Island Shaped by a Long Geological History
Madagascar’s history is one of the first keys to understanding its biodiversity.
The island has experienced a long history of separation from other major continental landmasses. The separation between Madagascar and the Indian subcontinent is dated to approximately 88 million years ago.
This geological history created favorable conditions for the particular evolution of many animal and plant lineages.
However, isolation does not mean that all Malagasy species have remained completely isolated for tens of millions of years. Recent research shows that Madagascar’s biological colonization history is more complex: some lineages are connected to the ancient history of Gondwana, while several groups probably reached the island later through dispersal across the ocean.
Over time, these processes contributed to producing a deeply distinctive fauna and flora.
2. One of the Highest Levels of Endemism in the World
One of Madagascar’s most remarkable characteristics is its level of endemism.
An endemic species is a species that naturally occurs in a specific geographical area and is not found in the wild anywhere else.
Among Madagascar’s terrestrial vertebrates, the figures are particularly impressive. A synthesis published in Oryx in 2022 estimates that 1,100 of the 1,234 terrestrial vertebrate species recorded in Madagascar are endemic, representing approximately 89%. When breeding birds are excluded from the calculation, the level of endemism reaches approximately 97%.
Some groups have even higher levels:
- Approximately 99% of amphibians are endemic;
- Approximately 95% of reptiles are endemic;
- Terrestrial primates, including lemurs, are endemic to Madagascar;
- Non-flying terrestrial mammals also have an endemism level close to 100%.
This characteristic explains why the disappearance of a Malagasy species can have an irreversible global consequence: when an endemic species disappears from Madagascar, it potentially disappears from the entire planet.
3. Iconic Species Found Nowhere Else
Lemurs are probably the best-known ambassadors of this biodiversity.
But they represent only part of Madagascar’s biological richness.
The island is also home to a remarkable diversity of chameleons, geckos, frogs, turtles, birds, invertebrates, and plants.
The flora is equally exceptional. Recent research shows that the humid regions of the north, east, and southeast contain major centers of plant diversity and endemism. It also shows that the dry and spiny forests of the west and south harbor distinctive forms of endemism that must also be taken into account in conservation strategies.
This diversity therefore cannot be reduced to a few iconic species. It represents a complex network of lineages, ecosystems, and ecological interactions.
4. An Exceptional Diversity of Ecosystems
Madagascar’s biodiversity is also closely linked to the diversity of its landscapes.
On the same island, there are:
- Tropical rainforests;
- Dry forests;
- Spiny forests;
- Mangroves;
- Wetlands;
- Mountain ecosystems;
- Savannas;
- Coral reefs and coastal ecosystems.
These environments have different climatic conditions, soils, and biological communities.
This diversity of landscapes therefore creates a multitude of habitats and ecological niches.
It helps explain why some species have evolved within very restricted territories and are sometimes dependent on a particular habitat.
Recent research on Madagascar’s flora also shows that areas of high diversity and endemism are not evenly distributed across the island. Several regions, particularly the humid forests of the north, east, and southeast, are major centers of plant diversity.
5. Biodiversity That Is Still Far From Fully Known
Despite decades of research, Madagascar’s biodiversity remains only partially documented.
A major scientific synthesis published in Science highlights that certain groups, such as fungi and a large proportion of invertebrates, remain poorly known. The authors also observe a significant increase in the number of newly described species in recent years.
This situation creates a paradox.
We already know that Madagascar has exceptional biodiversity, but we probably do not yet know the full extent of this richness.
Each new scientific discovery can therefore reveal a new species, a new population, or new information about the evolution and distribution of Malagasy species.
But the discovery may also come too late.
Some newly described species are already facing significant threats, demonstrating the urgency of documenting biodiversity more effectively while protecting it.
6. A Natural Wealth Under Pressure
Madagascar’s biodiversity is exceptional, but it is also particularly vulnerable.
The main pressures identified by scientific research include habitat transformation, the exploitation of biological resources, and unsustainable agricultural practices.
A review published in Science in 2022 indicates that the exploitation of biological resources and unsustainable agriculture are among the main threats identified for Madagascar’s terrestrial and freshwater biodiversity. According to their analysis, these two factors affect respectively 62.1% and 56.8% of the evaluated vertebrate species, and affect nearly 90% of the plant species studied.
Other pressures include habitat fragmentation and degradation, fires, climate change, introduced species, and certain forms of illegal exploitation.
Climate change is also an increasing threat to species already restricted to limited habitats. Recent research on plant endemism shows in particular that endemic taxa are highly exposed to pressures associated with habitat change and climate change.
7. Protecting Biodiversity Means Protecting Ecosystems and People
Biodiversity conservation is not simply about protecting species on a map.
Madagascar’s ecosystems provide essential resources and functions for local populations: food, water, natural resources, soil protection, climate regulation, and opportunities for economic development.
Communities living near forests, mangroves, wetlands, or coastal ecosystems are therefore directly concerned with their preservation.
Sustainable conservation must therefore take into account both biodiversity and the social, economic, and cultural realities of local territories.
Recent scientific research also emphasizes the need to develop conservation strategies capable of generating benefits both for biodiversity and for the people of Madagascar.
8. Essential Actors in Protecting This Heritage
Behind every preserved territory, every species studied, and every restored habitat, there are people taking action.
Researchers, local communities, rangers, associations, environmental educators, fishers, young leaders, entrepreneurs, volunteers, and institutional actors all contribute, in their own ways, to nature conservation.
These actors are essential because conservation is built within local territories.
It requires scientific knowledge, but also a deep understanding of local realities, community knowledge, civic engagement, and collaboration between organizations.
It is precisely this human dimension of conservation that Natiora Defenders seeks to highlight.
Our conviction is simple: protecting biodiversity also means recognizing those who defend it.
Through its programs and initiatives, Natiora Defenders highlights the people committed to protecting Madagascar’s marine, coastal, and terrestrial ecosystems, while also helping to create opportunities for visibility, connection, and collaboration.
Discover also the mission of Natiora Defenders and its commitment to nature heroes.
9. Why Does Madagascar’s Biodiversity Deserve Our Attention?
Madagascar’s biodiversity is not exceptional simply because it contains many rare species.
It is exceptional because it tells a unique evolutionary story, because it brings together species and ecosystems found nowhere else, and because a significant part of this richness is currently threatened.
Protecting it therefore means:
- Preserving endemic species;
- Maintaining functional ecosystems;
- Protecting the resources on which communities depend;
- Supporting scientific research and knowledge;
- Restoring degraded habitats;
- Strengthening local conservation initiatives;
- Passing this natural heritage on to future generations.
Protected areas play an important role in this strategy. An analysis published in Science estimates that the terrestrial protected-area network covered 10.4% of Madagascar’s territory at the time of their study and included at least part of the range of the vast majority of described native vertebrates for which distribution was known.
However, protected areas are only one component of a broader strategy.
Conservation must also rely on ecosystem restoration, research, monitoring, awareness-raising, sustainable resource management, and community engagement.
10. Madagascar Needs Nature Defenders
Madagascar’s biological richness is the result of millions of years of evolution. But its conservation now also depends on our choices and our collective ability to take action.
Scientists continue to discover and document new forms of life. Communities are developing solutions adapted to their territories. Conservation associations and organizations support local initiatives. Young people are taking action for their environment.
They all contribute to the same story: that of a country seeking to preserve an exceptional natural heritage while building a sustainable future for its people.
At Natiora Defenders, we believe that these people deserve to be known.
Because Madagascar has exceptional biodiversity, it needs defenders worthy of this richness.
And because behind every protected ecosystem are women and men who choose to take action, highlighting these nature heroes is also a way of contributing to conservation.
Scientific Sources
- Antonelli, A. et al. (2022). Madagascar’s extraordinary biodiversity: Evolution, distribution, and use. Science, 378(6623), eabf0869. DOI: 10.1126/science.abf0869.
- Goodman, S. M. et al. (2022). Madagascar’s extraordinary biodiversity: Threats and opportunities. Science, 378(6623), eabf8634.
- Goodman, S. M. et al. (2022). Updated estimates of biotic diversity and endemism for Madagascar—revisited after 20 years. Oryx.
- Antonelli, A. et al. / research team on Malagasy flora (2024). Spatial heterogeneity of neo- and paleo-endemism for plants in Madagascar. Current Biology, 34(6), 1271–1283.e4. DOI: 10.1016/j.cub.2024.02.023.
- Storey, M. et al. (1995). Timing of hot spot-related volcanism and the breakup of Madagascar and India. Science, 267(5199), 852–855. DOI: 10.1126/science.267.5199.852.
