Hello Augustine, the two -omics serve different purposes depending on what information you are interested in. Ecosystem sustainability studies, as you put it, entail a lot. Since microorganisms are not the only biotic components of an ecosystem, metagenomic studies alone will not provide satisfactory information. Metabolomic studies are concerned with metabolites of organisms at the Dalton scale, and is important to people like me in production biotechnology. However, I strongly support a combination of the two -omics methods. Please take a look at the attached. They've been quite useful for these kinds of discussions.

@Dr. Maurice Ekpenyong, thank you so much for the guidance and support materials.