This ecological research has been going on for three decades, the spatial and temporal extension of which is one of the largest and most important in the world.
In June 1989, Dr. Julio Gutiérrez and Dr. Luis Contreras, from the University of La Serena, in collaboration with Dr. Fabián Jaksic, from the Catholic University, and Dr. Peter Meserve, from the Northern Illinois University (USA), began what was, at the time, the largest-scale terrestrial ecological experiment in Chile and South America: long-term research in the Fray Jorge Forest National Park, which turns 30 this year.
Initially, the scientific questions sought to determine the role that ecological interactions played on the populations of small mammals and vegetation of the semi-arid scrubland. With this objective in mind, an ecological experiment was designed that consisted of selectively excluding predators and rodents from the ecosystem.
Thus, 16 experimental plots of half a hectare each were established in the semi-arid scrubland of the Bosque Fray Jorge National Park. In total, the intervened area covered practically 2km2. With a lot of effort, the experimental site was ready after months of hard work and, after a three-month test period, the LTER Fray Jorge officially started. Starting in June 1989, visits to the experimental plots began on a monthly basis, and in each of them, small mammals were captured, marked and released, and the cover of shrub and herbaceous vegetation was measured.
After 5 years of continuous monitoring of the system, the results indicated that, although predation and competition had a significant effect on some mammal species and vegetation, these effects were not general for all species and were practically minimal in comparison. to the effect of high environmental variability, in particular the effect that rain had on the scrub ecosystem.
In fact, periods of high precipitation (usually during El Niño events) increased the growth of herbaceous plants. This was also corroborated through an experiment carried out between 1997-2000, in which the importance of rain for the availability of resources (food) in the ecosystem could be verified.
In 1996, Dr. Douglas Kelt, from the University of California Davis (USA), joined the LTSER research team, and together they have expanded long-term monitoring efforts to other important community components, including birds and arthropods in order to understand the effects of climate on them. In addition, additional experimental plots have been installed to determine the impact of invasive species, such as hares and rabbits, on the scrub, whose impact is expected to be greater thanks to changes in annual precipitation since 2000.
In general, climate models under the global climate change scenario predict an increase in the frequency of El Niño events. For the Fray Jorge scrub ecosystem, the influence of climatic factors - particularly El Niño - were of greater importance than biological factors. From 1989 to 2001, the LTSER has documented significant changes in precipitation patterns. Before 2001, El Niño events accompanied by high rainfall occurred every 3 or 5 years, but from 2001 onwards El Niño years have been less common and have generally had less rain. During this time, Norte Chico has been impacted by a very severe drought, and during this time we have had less rain in the park combined with less climate variation from year to year. In fact, considering the findings of this long-term research, it is expected that this change in the frequency of El Niño will also lead to important changes on the dynamics within the ecosystem, in particular on ecosystem services.
“The Fray Jorge Forest National Park is home to a significant amount of the flora and fauna of the Coquimbo Region. There are several species that are only in the Park and that disappeared from adjacent sites. It is a true museum where we have seen and measured the effect of El Niño, of varying intensity and frequency. It has also been possible to measure climate change on the abundance of plants and the rodents that consume those plants. When it rains a lot, productivity increases and so do rodents and terrestrial predators such as foxes and birds of prey such as owls. In years of drought the abundance of grasses decreases and so do the rodents and foxes that consume those rodents,” explains Dr. Julio Gutiérrez, ULS academic and researcher and director of the Ecological Research in Arid Zones project PIEZA - LTSER Fray Jorge .
In the scientific field, the project has contributed to more than 100 scientific publications at the national and international level, and currently maintains a wide collaboration network with national and international research institutions and institutes. And it has also generated jobs, infrastructure, equipment and has contributed to the formation of advanced human capital with numerous bachelor's, master's and doctoral theses.
The continuity of this project has been possible thanks to the effort and dedication of the core of researchers, the fundamental support provided by the University of La Serena (ULS), the National Forestry Corporation (CONAF), the Institute of Ecology and Biodiversity (IEB), and the Center for Advanced Studies in Arid Zones (CEAZA). Since its inception, the LTSER has been awarded 10 research funds from the National Science Foundation (NSF) (about 1.8 million dollars) and 5 research funds from the FONDECYT REGULAR program (about 1.100 billion Chilean pesos) since 2000. .
In this sense, the Rector of the University of La Serena, Dr. Nibaldo Avilés, highlights that this important scientific work has its starting point at the end of the 80s, with the work started by a group of professionals, including Dr. Julio Gutiérrez, and where various institutions and organizations "unite their potential by developing a study that includes ecological research, whose spatial and temporal extension is one of the largest and most important in the world."
For the ULS Vice-Rector for Research and Postgraduate Studies, Dr. Eduardo Notte, meanwhile, it is one of the few projects in Chile that has lasted for so many years. “It is a source of pride for the University of La Serena and proof of how the institution is committed to long-term research. Studying the evolution of ecosystems is not done by just any entity, and that has required the commitment of the study house.”
Interesting data
To date, in the case of small mammals alone, more than 600.000 records have been made of more than 90.000 individuals of small mammals of at least 10 different species. Adding all observations of fauna in general (birds, mammals, and arthropods), more than 2 million fauna records are accumulated, making the project database one of the most extensive in the country and Latin America. If we add only the hours of work in the field, the time invested in ecological monitoring in these 30 years adds up to more than 87.000 hours, which is equivalent to practically 10 years of uninterrupted work dedicated to collecting information.
Celebrating three decades
To mark 30 years of ecological research, a celebration will be held on August 20 at 11:00 a.m. at the Environmental Interpretation Center of the Fray Jorge Forest National Park. This activity will be attended by authorities and representatives of the ULS, Regional Government, Institute of Ecology and Biodiversity and Center for Advanced Studies in Arid Zones, among other institutions.