A team of specialists from IBONE, IBS, and UBA managed to decipher a key aspect of the reproductive biology of Paspalum lilloi, an endemic plant of Misiones that only exists in the Iguazu Falls.
The discovery allowed for an explanation of how this species persists in an extreme environment that is increasingly vulnerable. The results provided decisive evidence to strengthen its legal protection in the province of Misiones.
The research was made possible thanks to the joint work of specialists who advanced in the study of its genetics and reproduction. The gathered information allowed the case to be brought to the legislative arena, where it was declared a “Natural Monument” and of “Public Interest.”
The regulation now prohibits its extraction from the natural environment and requires scientific authorization for any intervention.
A minimal ecosystem that demands urgent defense
Paspalum lilloi grows only on rocky walls in the Falls area, including sections of the Devil’s Throat. There, it faces an environment of constantly moving water, permanent mist, and high humidity, which limits its presence to just 8 km².
Its reduced distribution explains its classification as a “critically endangered” species internationally. Changes in the rainfall regime, associated with climate change, have altered the water dynamics in the area.
Extreme variations add to the impact of infrastructures that have altered the natural flow of the Iguazu River. These factors increase the risk of losing the microhabitat on which its survival depends.
The mechanism that keeps it alive
The scientific study determined that P. lilloi is a diploid, sexual, and self-fertile species. This means it can produce viable seeds even without cross-pollination, a vital strategy in adverse conditions.
The tests showed that self-pollination generates more than 90% of viable seeds, a true “biological insurance”. This mechanism allows the plant to continue reproducing even when wind, humidity, or water movement prevent the arrival of external pollen.
This is an uncommon adaptation in species subjected to such restricted environments. The ability to self-fertilize explains its persistence in a place where almost no other plant could sustain stable populations.
Ex situ cultivation and new possibilities for restoration
The scientific team also managed to maintain specimens in cultivation through systems that replicate the constant water flow of its habitat. This opens the door to germplasm banks and future reintroduction programs in degraded areas.
Additionally, it allows for safeguarding genetic material against possible extreme events that could reduce its wild populations. The collaboration between scientific institutions and public agencies allowed these results to be elevated to the legislative arena.
The law approved in Misiones prohibits any action that alters the species’ environment. It also only authorizes research aimed at its conservation.
A precedent for the protection of unique species like this endemic plant
The case of P. lilloi shows how science and environmental management can converge in concrete protection decisions. Its study lays the foundation for promoting similar measures in other endemic species at risk in the country.
It also highlights the importance of understanding the biology of organisms with extremely restricted distributions. The combination of research, regulation, and territorial action becomes fundamental in a context of accelerated climate change.
Each endemic species represents an unrepeatable chapter of the local biodiversity. Its loss would imply an irreversible disappearance for Argentina and the world.
Why endemic plants are so special and what role they play
Endemic plants are those that exist exclusively in a limited geographical area, sometimes as small as a valley, an island, or a rocky outcrop. Their restricted distribution makes them unique elements of the natural heritage of each region. They are the result of long and specific evolutionary processes, impossible to replicate.
These species often possess unique adaptations that allow us to understand how life adjusts to extreme conditions. Therefore, they function as sensitive indicators of the ecosystem’s state where they inhabit. Their disappearance is often an early sign of environmental deterioration.
Moreover, endemic plants play key ecological roles in their habitats. They provide food and shelter to insects, birds, or microorganisms that are also specialized. They sustain biological interactions that cannot be replaced by more common species.
When an endemic species is threatened, the entire ecological network that depends on it is at risk. Its conservation requires protecting not only the plant itself but also the particular environment that enables its existence. Therefore, its defense is a central pillar in modern conservation strategies.
