Former lab member Laura Dee today published in Ecology Letters a major piece of work from her dissertation, entitled To what extent can ecosystem services motivate protecting biodiversity? Read the full abstract below, find the paper here, and check out this awesome article about it in the UCSB current. The paper evaluates the potential consequences of recent shifts in conservation towards ecosystem service objectives. Laura and Steve, along with Michel De Lara and Chris Costello, another Bren professor, quantify how many species could be protected from optimizing some ecosystem services instead of focusing on individual species. What are the tradeoffs and policies that help balance human needs for services from nature with the need and ethical responsibility to protect biodiversity? Laura and her coauthors discuss this and other important questions about ecosystem service and biodiversity in their analysis.
Society increasingly focuses on managing nature for the services it provides people rather than for the existence of particular species. How much biodiversity protection would result from this modified focus? Although biodiversity contributes to ecosystem services, the details of which species are critical, and whether they will go functionally extinct in the future, are fraught with uncertainty. Explicitly considering this uncertainty, we develop an analytical framework to determine how much biodiversity protection would arise solely from optimising net value from an ecosystem service. Using stochastic dynamic programming, we find that protecting a threshold number of species is optimal, and uncertainty surrounding how biodiversity produces services makes it optimal to protect more species than are presumed critical optimal. We define conditions under which the economically optimal protection strategy is to protect all species, no species, and cases in between. We show how the optimal number of species to protect depends upon different relationships between species and services, including considering multiple services. Our analysis provides simple criteria to evaluate when managing for particular ecosystem services could warrant protecting all species, given uncertainty. Evaluating this criterion with empirical estimates from different ecosystems suggests that optimising some services will be more likely to protect most species than others.