By Joern Fischer
About a week ago, our project on food security and biodiversity conservation culminated in yet another completed PhD! Girma Shumi Dugo successfully defended his thesis. Congratulations Girma!
Girma’s thesis had an emphasis on biodiversity conservation, but also included several social-ecological aspects. The overall focus of the thesis was on woody vegetation, including its conservation values but also its values to local people.
Following a synthesis chapter, Girma’s first data chapter investigated woody vegetation in forest sites. This work found that many forest sites were highly species rich, especially in undisturbed locations deep within the forest. Historical effects and edge effects appeared to influence species richness and composition. This first data paper was published in Biological Conservation.
The second data paper is also published already, namely in Diversity and Distributions. This paper looked at woody species composition and richness in farmland areas. It found there was a significant effect of landscape history — and possibly an immigration credit. That is, sites in long-established farmland locations had a higher number of pioneer and generalist species than sites in recently established farmland.
The third data chapter in the thesis is currently in revision; it examines the relationship between the diversity of woody vegetation in plots throughout the landscape with the diversity of ecosystem services generated by woody vegetation in those plots. The findings suggest that woody species diversity leads to landscape multi-functionality, and that all land use types in the study area (farmland, coffee forest, forest without coffee) are essentially multifunctional.
Finally, the last chapter contains a detailed inventory of which species are used by local people for which different purposes. Nearly 100 species of woody vegetation are used by local people for 11 different purposes — this chapter thus demonstrates that woody vegetation is vital to the lives of local people. The chapter is in the final round of minor revisions for publication in Ecosystems and People.
A big congratulations to Girma for a well-rounded thesis!