Cacao farms not only provide us with the pleasure of chocolate, but also offer potential advantages for biodiversity-friendly agriculture. The benefits to biodiversity have been widely studied in tropical rainforests, but were so far unknown in tropical dry forests. An international team of researchers led by the University of Göttingen has now reported for the first time how seasonal effects drive the presence of birds and bats – the most important consumers of insect pests – in cacao agroforests in Peru. The results were published in Agriculture Ecosystems and Environment.
Tropical dry forests are globally threatened by deforestation and agriculture, and in northwestern Peru cacao is often grown near dry forest habitats. The researchers studied cacao agroforestry systems, i.e. growing cacao under shade trees, for more than one year and found that birds and bats – and mostly those that eat insects – benefit from them. “We found that tropical dry forests have unique bird and bat species, but cacao agroforestry is a good option for agricultural practices that benefit biodiversity,” reports first author Carolina Ocampo-Ariza from the Agroecology group at the University of Göttingen. She adds, “These results are valuable for designing and managing agricultural landscapes in megadiverse countries as Peru.”
The research team found that bats were always present in larger groups in cacao farms than in nearby forests, whereas this was the case for birds only in the dry season. “Cacao farms seem to serve as an oasis for birds, providing food and refuge when they are scarce in the forest,” states co-author Professor Teja Tscharntke, from the Agroecology group at the University of Göttingen. “This has important consequences for ecosystem services in agroforestry systems, as birds and bats play an important role controlling insect pests that attack cacao,” adds co-author Dr Bea Maas from the University of Vienna.