The Jaguar’s Habitat and Movement Needs
The jaguar is known for its adaptability, traversing diverse ecosystems such as forests, savannahs, agricultural areas, and even human-modified landscapes. However, for the survival of jaguar populations, it is not enough to have large expanses of jungle; they also require pathways that facilitate their movement between these areas. A recent study has mapped these pathways on a continental scale, revealing a stark disparity. While much of South America boasts a robust connectivity network, the populations in Mexico and Central America appear significantly more fragmented.
This research, published in Global Change Biology, identified 307 core areas—regions where the potential movement of jaguars is concentrated—covering approximately 7.75 million square kilometres, which represents 55% of their current distribution. The largest of these areas spans around 6.5 million square kilometres across eleven countries, linking four major ecological regions: the Amazon, the Llanos, the Chaco, and the Pantanal. In total, the study uncovered 176 potential corridors between core areas, although connectivity is not uniform throughout the species’ range.
Methodology and Findings
To reach these conclusions, researchers analysed data from 172 jaguars fitted with GPS collars, compiling 231,017 recorded locations of their movements. Using this information, they developed models estimating where jaguars are likely to move and how they could navigate between these zones. Guilherme Costa Alvarenga, a Brazilian researcher from the University of Oxford and the study’s lead author, expressed surprise at the size of the identified area. Nonetheless, this extensive network raises concerns, as isolated and small populations persist outside this vast South American web, with tenuous connections between South America, Central America, and Mexico.
The most pronounced contrast is evident between South America and the northern range of the jaguar in Mexico and Central America. The model based on core areas illustrates a comprehensive connectivity network traversing the Amazon, Llanos, Chaco, and Pantanal, extending into other South American regions. Nearly half of the identified core areas fall within protected zones or indigenous territories, a significant finding as isolation can impede movement and genetic exchange between populations.
The Importance of Connectivity
Esteban Payán, a Colombian jaguar specialist and co-founder of Panthera Colombia, noted that the study corroborates previously identified patterns while offering greater detail through direct animal data. He elaborated that the results are significant not only due to their scale but also because they depict corridors as intricate webs rather than straightforward lines, providing jaguars with multiple routes that enhance resilience against human destruction.
One particularly strategic area identified is in Colombia, where a connection traverses the Darién from Panama to northern Colombia, continuing towards San Lucas and the Llanos. Preserving this link is crucial for maintaining genetic flow among numerous jaguar populations across Central and South America. The model based on protected areas suggests potential connections between the Darién, the Amazon, and other regions that the core area model did not detect. Researchers believe that both approaches are complementary: the first realistically represents current ecological connectivity, while the second highlights long-term conservation opportunities.
Challenges of Monitoring and Validation
However, the maps generated come with a significant limitation. A modelled corridor represents a potential route rather than definitive proof of jaguar usage. Consequently, there is a pressing need to validate these findings through field monitoring. In Mexico, researcher Sandra Petrone Mendoza from WWF Mexico, a co-author of the study, stresses that these models simplify reality. The absence of identified corridors does not imply that jaguars cannot traverse those areas; rather, it indicates a lack of data.
Rodrigo Núñez, a researcher at the Universidad Michoacana and president of Proyecto Jaguar A.C., argues that much of the jaguar’s range in Mexico is fragmented outside the Maya Forest. He highlights that a continental model may depict corridors spanning dozens of kilometres, yet, at ground level, these routes may intersect with agricultural fields, populated areas, or other unsuitable environments for the species. This underscores the necessity of examining “micro-corridors”—small fragments and specific pathways that enable jaguars to navigate from one patch of vegetation to another.
Conservation Strategies and Genetic Flow
Núñez emphasises that simply identifying a corridor is just the first step; the next involves determining which areas require protection, which need restoration, and understanding how animals actually move. He identifies the connection between Pacific populations in Oaxaca and Chiapas and those in Jalisco, with intermediate populations in Guerrero and Michoacán, as particularly vulnerable and in need of conservation actions. Additionally, he points out the Isthmus of Tehuantepec as a strategic passage for maintaining genetic exchange between the Maya Forest and other Mexican populations.
Maintaining these connections not only facilitates individual movement but also conserves the natural flow of genes between populations. Núñez warns that while isolation may not yield immediate effects, over time, it can result in genetic differentiation among previously connected populations. He asserts, “If genetic changes occur in animal populations, ideally, they should be natural, not caused by us.”
Potential Impacts of Barriers on Jaguar Movement
Further along the jaguar’s range, the study identifies another area of uncertainty. The core area model does not indicate a clear connection between Mexico and the United States, whereas the protected area analysis suggests a possible route from northwestern Mexico to protected areas in Arizona and New Mexico. Costa Alvarenga warns that if the construction of a border wall continues, it will inevitably hinder the movement of the species, noting that there is currently no established population in the United States, only sightings of individuals passing through.
He asserts, “The construction of the wall will obstruct this movement, ensuring that no jaguar will establish itself there. If the wall proceeds, we must assume that the species has gone extinct in that area, as the animals will no longer be able to traverse.” Petrone concurs that this route requires validation through monitoring but considers it essential to maintain border permeability to allow jaguars to continue dispersing northward. The long-term goal, she explains, is to preserve conditions that would enable a resident population to return to the southern United States one day.
Broader Conservation Considerations
Núñez recalls that the jaguars that have reached the United States did so from Mexico, highlighting the importance of connectivity. A physical barrier could disrupt this natural recolonisation process. The discussion surrounding the border also reveals that corridors do not necessarily have to traverse only protected natural areas. Payán points out that a jaguar can pass through ranches, plantations, or mixed-use landscapes if conditions permit movement and if the animals are not persecuted. These big cats do not pose a threat to humans upon encountering them. The challenge lies not only in conserving the significant habitat blocks that remain intact but also in ensuring the permeability of the spaces between them.
Moving from Theory to Practice in Conservation
The next step involves verifying on-the-ground realities. Researchers propose enhancing monitoring with camera traps and GPS collars, incorporating genetic information, and studying in greater detail the routes jaguars utilise and the frequency of their movements. Núñez believes restoration could be part of the solution. Previous work in the wetlands of Marismas Nacionales—one of Mexico’s largest mangrove forests in Nayarit—has shown jaguars crossing agricultural fields even when little vegetation remains. This experience suggests that strategically protected small patches of natural vegetation could help connect larger fragments.
“Even when the land is completely worked by tractors, jaguars eventually cross it,” he adds. “This gives us hope that if we provide small refuges for jaguars—not extensive areas, but well-protected patches of natural vegetation—they will be encouraged to move from one location to another.” For Payán, the jaguar’s inherent adaptability provides a reason not to abandon these landscapes. “With a bit of help, the jaguar is quite resilient and can continue in most, I would say, of its range,” he concludes.
Conservation efforts must also extend beyond the jaguar. Núñez suggests considering corridors that could benefit multiple species, as a route that accommodates a large feline may not suffice for smaller species. The current challenge is to transform these potential routes into functional connections that support jaguars within their territories.
“I believe the message we should take away is that modifying elements—such as nature in this case—does not mean there is no turning back,” Costa Alvarenga concludes. “We have numerous restoration programmes underway. That is the key: ensuring that we can keep these lands connected, with the participation of all stakeholders, local communities, and society at large.”