Adrian Marchetti is an Assistant Professor of Marine Sciences in UNC's College of Arts and Sciences. His primary research focus is biogeochemical evolution of phytoplankton in marine environments. His lab investigates how phytoplankton are affected by their environment and in turn, influence ocean biogeochemistry and ecosystem dynamics. Particular interests include studying trace metals, such as iron, that are essential for the nutrition of phytoplankton and predicting the effects of future climate changes on phytoplankton distribution and abundance.
Areas of Expertise (6)
Aquatic Biogeochemical Processes
University of British Columbia: Ph.D, Botany 2005
McGill University: B.Sc, Biology 1998
Media Appearances (2)
Diatom Discovery Could Change Climate Models
Earth and Environment online
“Without the existence of these proteins that could help phytoplankton cope in these stressful environments, the phytoplankton diversity in many regions of the ocean would be much lower, in particular by reducing large phytoplankton such as diatoms that are known to take up a lot of carbon dioxide,” says Adrian Marchetti, assistant professor of marine science at the University of North Carolina-Chapel Hill.
Protein identified in certain microalgae changes conversation about climate change
Adrian Marchetti and his team of oceanographers at the University of North Carolina at Chapel Hill have identified —for the first time—that a protein called proteorhodopsin could allow a major group of phytoplankton to survive in iron-limited regions of the ocean.
department of marine sciences
ABSTRACT: In vast expanses of the oceans, growth of large phytoplankton such as diatoms is limited by iron availability. Diatoms respond almost immediately to the delivery of iron and rapidly compose the majority of phytoplankton biomass. The molecular bases underlying the subsistence of diatoms in iron-poor waters and the plankton community dynamics that follow iron resupply remain largely unknown. Here we use comparative metatranscriptomics to identify changes in gene expression associated with iron-stimulated growth of diatoms ...
ABSTRACT: Primary productivity in 30–40% of the world's oceans is limited by availability of the micronutrient iron. Regions with chronically low iron concentrations are sporadically pulsed with new iron inputs by way of dust or lateral advection from continental margins...
ABSTRACT: We report results from the Subarctic Ecosystem Response to Iron Enrichment Study (SERIES) experiment in waters of the NE subarctic Pacific in which a large scale iron (Fe) enrichment lead to a shift in the phytoplankton assemblage from pico-and nanophytoplankton to one dominated by large diatoms...
ABSTRACT: Comparison of eight iron experiments shows that maximum Chl a, the maximum DIC removal, and the overall DIC/Fe efficiency all scale inversely with depth of the wind mixed layer (WML) defining the light environment. Moreover, lateral patch dilution, sea surface irradiance, temperature, and grazing play additional roles. The Southern Ocean experiments were most influenced by very deep WMLs. In contrast, light conditions were most favorable during SEEDS and SERIES as well as during IronEx-2...
ABSTRACT: Iron supply has a key role in stimulating phytoplankton blooms in high-nitrate low-chlorophyll oceanic waters. However, the fate of the carbon fixed by these blooms, and how efficiently it is exported into the ocean's interior, remains largely unknown. Here we report on the decline and fate of an iron-stimulated diatom bloom in the Gulf of Alaska...