We have posted about Saharan dust before and the important role it plays in providing nutrients to The Bahamas (see here). This new article suggests that Saharan Dust is linked to population growth of Vibrio bacteria – bacteria known to cause health problems in humans and marine organisms. Below is a brief summary of the research article (see full article here) and a link to a popular news article here.
Atmospherically transported dust from the Saharan desert provides pulses of biologically important nutrients, including iron, to ocean surface waters. The biological response to these ephemeral events is not fully known, especially among the heterotrophic microbial community. Here we use the well characterized Vibrio genus as a model for heterotrophic bacterial response. We demonstrate that Saharan dust nutrients, deposited in tropical marine waters, can promote Vibrio bloom formation and suggest that dust-associated iron is an important driver of Vibrio population dynamics. This work shows not only the role of fast-acting heterotrophs in the biogeochemical cycles of environmental pulses of iron, but it also highlights an important factor in the growth of bacteria that can cause disease in humans and marine organisms.
Westrich, J. R., A. M. Ebling, W. M. Landing, J. L. Joyner, K. M. Kemp, D. W. Griffin, and E. K. Lipp. 2016. Saharan dust nutrients promote Vibrio bloom formation in marine surface waters. Proceedings of the National Academy of Sciences. DOI: 10.1073/pnas.1518080113