Understanding the interplay of ocean physics and biology at the submesoscale and below (<30 km) is an ongoing challenge in oceanography. While poorly constrained, these scales may be of critical importance for understanding how changing ocean dynamics will impact marine ecosystems. Fronts in the ocean, regions where two disparate water masses meet and isopycnals become tilted …
Agricultural headwater streams and ditches commonly host dense stands of aquatic vegetation that grow and decay over seasons and exert physical and biological controls on the transport of nutrients from cropland to larger rivers. This study examined changes in the transport of phosphorus (P) in an agricultural drainage ditch in the Maumee River Basin (Ohio, …
Docosahexaenoic acid (DHA) and calcidiol could be enriched in chicken for improving public nutrition and health. It remains unclear if supranutritional levels of DHA and calcidiol impair growth performance or metabolism of broiler chickens. This study was to determine singular and combined effects of high levels of supplemental DHA-rich microalgal biomass or oil and calcidiol …
Accurate and robust retrieval of ocean color from remote sensing enables critical observations of aquatic natural systems, from open ocean biological oceanography, coastal biodiversity, and water quality for human health. In the last decade, studies have increasingly highlighted the important role of small-scale processes in coastal and marine ecology and biogeochemistry, but observation and modeling …
The Johnson Lab was selected for a Spark Award for pilot demonstration of carbon capture/storage technology based on ABECCS (Algae with BioEnergy Carbon Capture and Storage). As atmospheric carbon dioxide concentrations continue to rise there are substantial negative impacts to the environment and societies across the globe. Beyond just reducing future emissions, Intergovernmental Panel on …
The Galápagos Archipelago lies within the Eastern Equatorial Pacific Ocean at the convergence of major ocean currents that are subject to changes in circulation. The nutrient-rich Equatorial Undercurrent upwells from the west onto the Galápagos platform, stimulating primary production, but this source of deep water weakens during El Niño events. Based on measurements from repeat …
In memory of Joe Bonaventura, a long time faculty member at the Duke Marine Laboratory and inspiration to so many, a crab pot Christmas Tree (a distinct eastern NC tradition) was decorated by the Johnson Lab and shown as part of the Crystal Coast Hospice 2021 Gingerbread Festival. The tree featured ornaments and other items …
As part of the Duke University Marine Laboratory produced “Seas the Day” podcast series, Junyao lead the latest episode “Navigating the Choppy Waters of the US PhD Application Process” In this episode, she interviewed five PhD students and the doctoral program coordinator, to learn about the biggest challenges of applying PhD, reasons to do it, …
Dr. Johnson received the Algae Biomass Organization Mid-Career Excellence Award – For excellence in scholarly achievements and a record of productive, independent, and impactful peer-reviewed research and creative scholarship activities “Dr. Johnson has made vast contributions to the peer-reviewed literature in areas associated with microalgae cultivation, oceanography, molecular ecology, and microbiology genetics. He has served as PI …
Expanding markets for microalgae and macroalgae products have led to increased development of commercial farming operations. While microalgae and macroalgae, or seaweed, have historically been harvested in many parts of the globe, more recent developments seek to improve productivity, decrease production costs, increase scale, and mitigate environmental impacts of cultivation. This review describes current progress …