Fall 2019

Fall 2019 Seminars

A-340  Earth & Marine Sciences Building
Fridays, 10:40 a.m. - 11:45 p.m. (unless otherwise noted*)

Seminar Coordinator: Marilou Sison-Mangus

For disability-related accommodations: call (831) 459-4730 or email osadmin@ucsc.edu


    October 4

  • Adam Martiny, UC Irvine

    Non-Redfield rations in the ocean: A tale of using genomics to understand and predict changes in ocean biogeochemistry

  • October 11

  • Henry Ruhl, MBARI CENCOOS

    Aligning strategic priorities, science and technology developments, and the operation of CeNCOOS

    The Central and Northern California Ocean Observing System (CeNCOOS) is one of 11 regional associations that form the US Integrated Ocean Observing System (IOOS). CeNCOOS collects, processes and disseminates ocean information for society that is tailored for regional needs. This effort includes priorities for improving estimates and predictions of ocean conditions, improving safety and efficiency of maritime commerce, and the sustained use of ocean resources. Systems include high frequency radar measurement of surface currents, gliders, moorings, shore stations and model tools. Efforts are underway globally, nationally and regionally to improve capability in biology and ecosystem observations. Building regional and larger scale networks of new sensors and samplers requires strategic alignment of technology readiness with the identification and specification of information needs. This seminar will provide background on CeNCOOS operations and give examples of systems that show promise for streamlining access to biology and ecosystem data in IOOS in the next five years. Together these tools are expected to provide a wider range of options for managing protected species and living resources, examining risk, establishing baseline and variations in conditions, and providing information for decision makers during events.

  • October 18

  • Shady Amin, NYU Abu Dhabi

    Zooming in on the Phycosphere

    The phycosphere is the ecological interface where phytoplankton cells interact with heterotrophic bacteria in aquatic systems. These interactions influence fundamental processes that include nutrient provision and regeneration, primary production, harmful blooms and biogeochemical cycling. Despite their importance, studying these interactions is inherently difficult due to the minute volume of the phycosphere, varying from picoliter to nanoliter. I will present results that demonstrate the ability of phytoplankton to recruit and modulate bacterial communities in the phycosphere and new technologies that can help us study interactions in the phycosphere in situ.

  • October 25

  • Bethanie Edwards

    Lipidomic insights into microbial interactions and ocean biogeochemistry

    Lipids are structurally diverse organic biomolecules that are essential to all life on this planet. Due to the role of lipids in energy storage, chemical signaling, cell structure, and energy harvesting, lipids are excellent biomarkers for microbial interactions within the biological carbon pump. Here I will discuss the advantages and challenges of lipidomic profiling through 3 case studies that explore marine microbial dynamics: viral infection of diatoms in culture, microzooplankton grazing of diatoms in culture, and both of these processes during a bloom in the California Coastal Ecosystem. 

  • November 1

  • Michelle Newcomer, LBNL

    Climate and hydrological controls on coastal harmful algal blooms

    Microalgae play a crucial role in mediating the global carbon cycle, and underpin food webs in oceanic and coastal environments. However, when present in unusually high concentrations, coupled with toxin production, harmful algal blooms (HABs) produce detrimental effects that permeate through food chains, impacting the health of living organisms in the marine coastal environment. Adding complexity to the conditions controlling HABs, hydrological and climatic controls are inextricably linked to the water quality conditions in the watershed and at the export point. While many studies suggest nutrients drive coastal blooms, this is not always the case, leading to the problem of stressed, intractable models, and fundamentally unpredictable onset. Feedbacks and couplings through biogeochemical and biological pathways within the water column, hyporheic, and benthic zones down the watershed ultimately control the fate and delivery of metals, nutrients, and solutes important for HAB formation. Mechanistic representation and understanding of these complex, non-linear drivers is poorly understood, and in this work we present novel machine learning and numerical modeling approaches to address this challenge. 

  • November 8

  • Frederik Schulz, LBNL

    Global giant virus diversity and putative host interactions through genome-resolved metagenomics

    The discovery of giant viruses with genomes in the megabase-range and equipped with a wide variety of features typically associated with cellular organisms was one of the most unexpected, intriguing and spectacular breakthroughs in virology. Until recently, most of our knowledge about these viruses came from the around 100 species-level isolates derived from culturable protists and algae. In a recent study we employed cultivation-independent single cell genomics and global metagenomics which led to recovery of more than 2000 novel giant virus genomes. The diversity of the discovered viruses and their coding potential revealed that giant viruses are highly abundant across Earth’s biomes where they impact biology and ecology of a wide-range of eukaryotic hosts and ultimately affect global nutrient cycles.


  • November 15

  • Tim DeVries, UCSB

    Decadal variability of the ocean carbon sink

    In this talk I will compare several methods of estimating ocean carbon uptake over the past 30 years, and examine the decadal variability of the ocean carbon sink over that time period. I will also examine the mechanisms driving global and regional variability in ocean carbon uptake over the past 30 years.

  • November 22

  • Charlie Paull, MBARI

    Tracking the passage of sediment gravity flows through Monterey Canyon

    Turbidity currents carry huge amounts of sediment, organic carbon, and pollutants down submarine canyons and into the deep sea, yet surprisingly little is known about the internal dynamics of these events. To rectify this knowledge gap researchers from five institutions pooled equipment and shared the risks to deploy a dense array of >50 sensors within Monterey Canyon for an 18-month long period and also mapped the canyon floor multiple times during the experiment. This instrument array captured the passage of 16 powerful sediment flow events moving at up to 7.2 m/per second which revealed the internal structure of these flows in unprecedented detail while the repeated mapping show the impact of the flows on the canyon floor morphology.


  • November 29

  • No Seminar

    Thanksgiving Break

  • December 6

  • No Seminar