Distribution of dissolved iron and bacteria producing the photoactive siderophore, vibrioferrin, in waters off Southern California and Northern Baja

TitleDistribution of dissolved iron and bacteria producing the photoactive siderophore, vibrioferrin, in waters off Southern California and Northern Baja
Publication TypeJournal Article
Year of Publication2019
AuthorsYarimizu K., Cruz-Lopez R., Garcia-Mendoza E., Edwards M., Carter ML, Carrano C.J
Volume32
Pagination139-154
Date Published2019/02
Type of ArticleArticle
ISBN Number0966-0844
Accession NumberWOS:000457691700012
Keywordsacquisition; bacteria; binding; Biochemistry & Molecular Biology; cathodic stripping voltammetry; chemistry; community; complexation; genes; gulf; HAB; Iron; of California; pacific; Pacific Ocean; Photoactive; phytoplankton; siderophores; surface; Vibrioferrin
Abstract

Phytoplankton blooms can cause acute effects on marine ecosystems due either to their production of endogenous toxins or to their enormous biomass leading to major impacts on local economies and public health. Despite years of effort, the causes of these Harmful Algal Blooms are still not fully understood. Our hypothesis is that bacteria that produce photoactive siderophores may provide a bioavailable source of iron for phytoplankton which could in turn stimulate algal growth and support bloom dynamics. Here we correlate iron concentrations, phytoplankton cell counts, bacterial cell abundance, and copy numbers for a photoactive siderophore vibrioferrin biosynthesis gene in water samples taken from 2017 cruises in the Gulf of California, and the Pacific Ocean off the coast of northern Baja California as well as during a multiyear sampling at Scripps Pier in San Diego, CA. We find that bacteria producing the photoactive siderophore vibrioferrin, make up a surprisingly high percentage of total bacteria in Pacific/Gulf of California coastal waters (up to 9%). Vibroferrin's unique properties and the widespread prevalence of its bacterial producers suggest that it may contribute significantly to generating bioavailability of iron via photoredox reactions.

DOI10.1007/s10534-018-00163-3
Student Publication: 
No