By Patricia Rodrigues and colleagues
The following is the third of a series of summaries of preliminary findings from our ERC funded research. Details are subject to change.
Tropical landscapes are changing rapidly as a result of human activities, including widespread deforestation for large-scale agricultural expansion. Heterogeneous landscapes that encompass different levels of forest cover, small-scale farming and human settlements are therefore becoming increasingly important for biodiversity conservation. Birds play important functional roles in ecosystems. For example, birds that feed on fruit disperse seeds across the landscape and thus contribute to forest regeneration. We assessed the conservation value of heterogeneous landscapes for bird diversity in 6 kebeles in Jimma zone, southwestern Ethiopia. We sampled 150 points distributed across pastures, homegardens, farmland fields and forests. We detected a total of 129 bird species, of which 76 occurred in forest and 112 in farmlands, grazing areas and homegardens. In forest, bird community composition varied with the intensity of coffee management: plots with more intensive management typically supported fewer bird species (10 species on average in intensively managed plots; 12 in lots with low management intensity; 14 in plots without coffee management). Undisturbed forests hosted species like the Abyssinian Groundthrush, White-cheeked Tauraco and Hill Babbler. Homegardens, farmland fields and grazing areas had similar numbers of species (on average 13, 12 and 12 species), and bird community composition varied with the amount of woody vegetation surrounding the sampling plots. Common species were the Baglafecht weaver, Common Bulbul and Variable Sunbird. Our findings highlight the importance of heterogeneous landscapes for birds. Some species are farmland specialists, whereas others only occur in undisturbed forests. Coffee forests that are managed at low intensities also contribute to the conservation of forest bird diversity.
- Undisturbed forest patches are key to conserving forest birds such as the Abyssinian Groundthrush or the Hill Babbler.
- Coffee forests managed at low intensity also contribute to bird diversity conservation.
- Bird diversity was high within the heterogeneous farmland mosaic, including grazing areas, live fences and scattered woody vegetation.