Скачать или смотреть Making Sense of Complexity with Daniel Muratore

Join us for a conversation with Daniel Muratore!

Daily and seasonal cycles of solar energy input and ocean water column physics drive patterns in primary production of marine microbial ecosystems, ultimately setting the rhythm of biological carbon export to the deep sea. Primary production, in turn, fuels highly diverse and heterogeneous community ecological and biochemical networks across the ocean. In the oligotrophic open ocean surface, community metabolism relies on rapid recycling and partitioning of scarce resources across organisms. Here, we will investigate temporal partitioning of resource utilization and liberation in these ecosystems using hourly-resolution, Lagrangian, multi-omic, time series data from both the North Pacific Subtropical Gyre and the Sargasso Sea in the Atlantic. Results from both systems suggest emergent day/night cycles in ecosystem functions not directly related to photosynthesis. In the primarily nitrogen-limited North Pacific Subtropical Gyre, different ecosystem functional groups 'take turns' assimilating nitrogen at different times of day, while in the primarily phosphorus-limited Sargasso Sea, phosphorus uptake is partitioned in a corresponding way. Evidence also suggests that viral infection of these organisms is entrained to the day/night cycle, and transcriptional signatures of lysis are synchronized across vastly diverse viral groups. For the Sargasso Sea, we will discuss how heterogeneity in the vertical distribution of viral infection potentially contributes to seasonal accumulation in oxygen beneath the surface mixed layer in the stratified season.

Daniel Muratore is a Complexity Postdoctoral Fellow at the Santa Fe Institute studying how ecological and evolutionary dynamics among marine microbes and their myriad viruses scale up to global climatic and biogeochemical processes. They are particularly interested in how sinking cellular debris and detritus drive fluxes of carbon and other elements from the atmosphere to the deep sea via the 'biological pump', and what role viral infection of marine microorganisms might take in changing the magnitude and efficiency of the biological pump in a changing ocean. Muratore's research synthesizes theoretical ecological and biophysical models with oceanographic field observational data under a complex systems framework. Having spent almost 100 in the past year at sea, Daniel has collected data to test theoretical predictions about scaling relationships in ecosystem elemental content, feedbacks between nutrient supply ratios and the evolution of macromolecular stoichiometry, and to gain better empirical understanding of the relationship between viral infection and ecosystem metabolism and resource use. Find out more about Daniel here.