Final answer:
An ecologist would be the appropriate specialist to consult for advice on improving natural ecosystems in a community project.
Step-by-step explanation:
A student working on a community project focused on improving natural ecosystems would consult an ecologist for advice on how to go about it. Ecologists study the relationships between organisms and their environment, helping to understand the impact of human activities on ecosystems and providing guidance for conservation efforts. They work at various levels, including organism, population, community, and ecosystems to collect data and develop management strategies that promote sustainability.