After days of non-stop flights and weeks of travel, a weary Canada warbler touches down on a Cecropia tree in Peru, ready to gorge itself on insects. These trees, like all the native species, have co-evolved with migratory birds, who rely on the sustenance they provide to restore fat reserves lost during their long journey to the wintering grounds. And, Cecropia species are quite common in shade coffee systems. As part of the Bird-Friendly Coffee initiative, Smithsonian Migratory Bird Center geographer Robert Rice and partners are gearing up to find out which trees in shade coffee farms supply the most food resources for birds.
“Ecologically, the more diverse complex of trees a farmer has on his or her coffee plantation, the greater diversity of life he or she can support,” says Rice. “We happen to be focusing on birds for this study, but a whole array of mammals, amphibians, invertebrates and so on undoubtedly benefit from having a variety of food options at their disposal. The question is: which trees are supplying the best resources? We have never done a study like this before, so knowing this information will help us advise coffee growers about which trees can enhance the ecological health of these managed habitats, making them even more attractive to wildlife.”