By Patricia Rodrigues
I am Patrícia, one of Joern’s PhD students working on his ERC-project that aims to identify social-ecological system properties benefiting food security and biodiversity. Very briefly, my background is in ecology and conservation biology and I’ve worked on topics such as the biogeography of Angolan mammals, the effects of cashew expansion on biodiversity in Guinea-Bissau, or on land use changes in a landscape undergoing farmland abandonment in Portugal.
Within this ERC-project I am working on the empirical case study that takes place in the rural landscapes of southwestern Ethiopia. In my research, I am assessing the effects of coffee production and forest fragmentation on biodiversity, more specifically on birds and mammals. Also, and taking advantage of our awesome inter and transdisciplinary research group, I am looking at a global driver of change in our planet – population growth. I am doing this using a lens from the social sciences, and trying to understand which factors influence women’s fertility decisions and what promotes or hinders the use of family planning methods in the region.
But let’s move on to the main purpose of this post, which is to share with you the findings of a new paper we’ve published where we’ve looked into the effects of coffee management and landscape context on forest bird diversity in southwestern Ethiopia.
In the landscapes of our study area, coffee is mostly grown under the shade of native trees, and management varies in intensity but it is mostly done using traditional practices (such as the clearing of the understory and thinning and pruning of the canopy). In order to understand if the variation in coffee management had an effect on the bird community we sampled birds (between Nov 2015 and Feb 2016) in a total of 66 forest points that differed in their degree of coffee management and accessibility. Some of the points were located on the forest interior, in nearly undisturbed and very hard to access forest, while other points were located in relatively intensively managed coffee forest.
Overall, we found a diverse community of forest birds (76 species, 6 endemic to the highlands of Ethiopia and Eritrea) and we found no effect of coffee management and landscape context on total species richness and total abundance of birds. However, the richness of forest and dietary specialists increased with higher forest naturalness (a local effect), and with increasing distance from the edge and amount of forest cover (a landscape effect). Wrapping up, our results indicate that conservation measures need to consider both local and landscape scales, and that, on the one hand traditional shade coffee management practices can maintain a diverse suite of forest birds, on the other, the conservation of forest specialists hinges on the maintenance and protection of large undisturbed areas of natural forest.