A team led by the University of Alicante (UA), along with researchers from the Universidad Miguel Hernández de Elche, the University of Granada, and the Universidad Técnica Particular de Loja (Ecuador), published a pioneering study in Biodiversity and Conservation on the impact of tropical dry forest degradation on scavenger vertebrate communities.
This is one of the first quantitative studies in this ecosystem, considered among the most threatened in the world. The work involved monitoring 60 carcasses using camera traps in different states of forest conservation.
Main Results
- 13 species of scavenger vertebrates (6 mammals, 6 birds, and 1 reptile) were recorded, with estimates that could reach at least 17 species.
- In well-preserved forests, up to 11 different species were detected, including emblematic birds like the king vulture (Sarcoramphus papa) and the white-tailed jay (Cyanocorax mystacalis).
- In degraded habitats, communities were simplified and dominated by opportunistic species such as the Sechura fox (Lycalopex sechurae), responsible for consuming almost half of the carcasses.
- Carcasses disappeared faster in degraded areas: 1-2 days compared to more than 3 days in semi-natural areas.
Ecological Role of Scavengers
Vertebrate scavengers play an essential role:
- Accelerate the decomposition of organic matter.
- Recycle nutrients in the ecosystem.
- Reduce the spread of pathogens.
The study documented for the first time scavenging behavior in opossums of the genus Marmosa, expanding knowledge about the feeding ecology of these small marsupials.
Interpretation of the Findings
Researchers warn that the apparent functional efficiency in degraded areas should not be confused with ecological resilience.
It is a reorganization towards more homogeneous communities, dominated by opportunistic species, associated with the historical loss of large predators and human transformation of the landscape.
Importance of Conservation
Better-preserved forests act as refuges for sensitive and threatened species, including several endemic to the Tumbesian region (Ecuador and Peru). Maintaining these habitats is crucial not only to protect biodiversity but also to ensure the complexity and stability of ecological processes that sustain ecosystems.
The study led by the UA demonstrates that forest degradation profoundly alters the ecological role of scavengers in tropical dry forests. Although some functions are maintained, they do so in a simpler and less stable way. The research underscores the urgent need to conserve well-structured forests to ensure biodiversity and long-term ecological resilience.
