Recent Publications

Weekly Highlighted Publication

Parasite and host biomass and reproductive output in barnacle populations in the rocky intertidal zone

Impact:
Here, we provide an initial insight into the role of parasites in rocky intertidal communities by examining how H. balani impacts Chthamalus fissus hosts and populations using the currencies of biomass and reproduction. Chthamalus fissus is a simultaneously hermaphroditic acorn barnacle susceptible to parasitism by H. balani that inhabits the high rocky intertidal zone. We first documented the relationship between body size and reproductive output for both individual hosts and parasites. We then applied these relationships to natural barnacle populations from 12 localities throughout Southern California, allowing us to express the impacts of parasitism at the population-level in terms of host and parasite standing-stock biomasses and reproductive outputs.

Search Recent Publications

  • Hosegood P.J, Nimmo-Smith W.AM, Proud R., Adams K., Brierley A.S.  2019.  Internal lee waves and baroclinic bores over a tropical seamount shark 'hot-spot'. Progress in Oceanography. 172:34-50.
    Abstract Summary:

    Oceanographic observations were made with a subsurface oceanographic mooring over the summit and flanks of two neighbouring seamounts in the tropical Indian Ocean to identify processes that may be responsible for the aggregation of silvertip sharks (Carcharhinus albimarginatus) in the deep water drop-off surrounding the summits. The seamounts, which are in the Chagos Archipelago in the British Indian Ocean Territories, are narrow in...

  • Wagner T.JW, Straneo F, Richards C.G, Slater D.A, Stevens L.A, Das S.B, Singh H..  2019.  Large spatial variations in the flux balance along the front of a Greenland tidewater glacier. Cryosphere. 13:911-925.
    Abstract Summary:

    The frontal flux balance of a medium-sized tidewater glacier in western Greenland in the summer is assessed by quantifying the individual components (ice flux, retreat, calving, and submarine melting) through a combination of data and models. Ice flux and retreat are obtained from satellite data. Submarine melting is derived using a high-resolution ocean model informed by near-ice observations, and calving is estimated using a record of...

  • Giron-Nava A., Johnson A.F, Cisneros-Montemayor A.M, Aburto-Oropeza O.  2019.  Managing at Maximum Sustainable Yield does not ensure economic well-being for artisanal fishers. Fish and Fisheries. 20:214-223.
    Abstract Summary:

    Maximum Sustainable Yield (MSY) is a common target for fisheries aiming to achieve long-term ecological sustainability. Although achieving MSY may ensure the long-term sustainability of fish populations, we ask whether it will provide economic security for fishers. Here we use 16 years of daily landing records to estimate potential catches and revenues per capita if fisheries were exploited at MSY in 11 subregions across Mexico. We then...

  • Hou X.M, Wang C.Y, Gerwick WH, Shao C.L.  2019.  Marine natural products as potential anti-tubercular agents. 165:273-292.
    Abstract Summary:

    Tuberculosis has been one of the greatest global health challenges of all time. Although the current first-line anti-tuberculosis (anti-TB) medicines used in the clinic have reduced mortality, multidrug-resistance and extensively drug-resistance forms of the disease have now spread worldwide and become a global problem. Even so, few new clinically approved drugs have emerged during the past 30 years. Highly biodiverse marine organisms have...

  • Peoples L.M, Grammatopoulou E., Pombrol M., Xu X.X, Osuntokun O., Blanton J., Allen EE, Nunnally C.C, Drazen J.C, Mayor D.J et al..  2019.  Microbial community diversity within sediments from two geographically separated hadal trenches. Frontiers in Microbiology. 10
    Abstract Summary:

    Hadal ocean sediments, found at sites deeper than 6,000 m water depth, are thought to contain microbial communities distinct from those at shallower depths due to high hydrostatic pressures and higher abundances of organic matter. These communities may also differ from one other as a result of geographical isolation. Here we compare microbial community composition in surficial sediments of two hadal environments-the Mariana and Kermadec...

  • Abstract Summary:

    Understanding community assembly and processes driving diversity in deep-sea environments is a major challenge in marine microbial ecology. The deep sea represents the largest ecosystem on Earth, but its remoteness makes the microbial community composition and functionality largely unknown. Moreover, microbial-focused studies comparing different deep-sea habitats like dynamic submarine canyons and slope ecosystems altogether are rare. The...

  • Manizza M, Menemenlis D., Zhang H, Miller C.E.  2019.  Modeling the recent changes in the Arctic Ocean CO2 sink (2006-2013). Global Biogeochemical Cycles. 33:420-438.
    Abstract Summary:

    The Arctic Ocean (AO) and its associated marginal seas have recently experienced rapid climate and environmental changes, most notably sea-ice area (SIA) loss and warming potentially impacting its uptake of carbon dioxide (CO2). We used the state-of-the-art ECCO2-Darwin coupled ocean-biogeochemistry model to simulate the 2006-2013 period and investigate the impact of changing SIA on the CO2 uptake of the AO. We find that the mean annual CO2...

  • Fang Y., Lakey P.SJ, Riahi S., McDonald A.T, Shrestha M., Tobias D.J, Shiraiwa M., Grassian VH.  2019.  A molecular picture of surface interactions of organic compounds on prevalent indoor surfaces: limonene adsorption on SiO2. Chemical Science. 10:2906-2914.
    Abstract Summary:

    Indoor surfaces are often coated with organic compounds yet a molecular understanding of what drives these interactions is poorly understood. Herein, the adsorption and desorption of limonene, an organic compound found in indoor environments, on hydroxylated silica (SiO2) surfaces, used to mimic indoor glass surfaces, is investigated by combining vibrational spectroscopy, atomistic computer simulations and kinetic modeling. Infrared...

  • Highlighted Publication Greenery among wetlands, photo courtesy NOAA
    Ezcurra E., Barrios E., Ezcurra P., Ezcurra A., Vanderplank S., Vidal O., Villanueva-Almanza L., Aburto-Oropeza O.  2019.  A natural experiment reveals the impact of hydroelectric dams on the estuaries of tropical rivers. Science Advances. 5
    Abstract Summary:

    We tested how sediment trapping by hydroelectric dams affects tropical estuaries by comparing two dammed and two undammed rivers on Mexico's Pacific coast. We found that dams demonstrably affected the stability and productivity of the estuaries. The two rivers dammed for hydroelectricity had a rapid coastal recession (between 7.9 and 21.5 ha year(-1)) in what should otherwise be an accretional coastline. The economic consequences of this dam-...

  • Behrenfeld M.J, Moore R.H, Hostetler C.A, Graff J., Gaube P., Russell LM, Chen G., Doney SC, Giovannoni S., Liu H.Y et al..  2019.  The North Atlantic Aerosol and Marine Ecosystem Study (NAAMES): Science motive and mission overview. Frontiers in Marine Science. 6
    Abstract Summary:

    The North Atlantic Aerosols and Marine Ecosystems Study (NAAMES) is an interdisciplinary investigation to improve understanding of Earth's ocean ecosystem-aerosol-cloud system. Specific overarching science objectives for NAAMES are to (1) characterize plankton ecosystem properties during primary phases of the annual cycle and their dependence on environmental forcings, (2) determine how these phases interact to recreate each year the...

  • Cai W.J, Wu L.X, Lengaigne M., Li T., McGregor S., Kug J.S, Yu J.Y, Stuecker M.F, Santoso A., Li X.C et al..  2019.  Pantropical climate interactions. Science. 363:944-+.
    Abstract Summary:

    The El Nino-Southern Oscillation (ENSO), which originates in the Pacific, is the strongest and most well-known mode of tropical climate variability. Its reach is global, and it can force climate variations of the tropical Atlantic and Indian Oceans by perturbing the global atmospheric circulation. Less appreciated is how the tropical Atlantic and Indian Oceans affect the Pacific. Especially noteworthy is the multidecadal Atlantic warming that...

  • Highlighted Publication Barnacles on a rock
    Fong C.R, Kuris A.M, Hechinger R.F.  2019.  Parasite and host biomass and reproductive output in barnacle populations in the rocky intertidal zone. Parasitology. 146:407-412.
    Abstract Summary:

    The rocky intertidal zone has a long history of ecological study with barnacles frequently serving as a model system to explore foundational theories. Parasites are often ignored in community ecology studies, and this particularly holds for true for the rocky intertidal zone. We explore the role of the isopod parasite, Hemioniscus balani, on its host, the acorn barnacle, Chthamalus fissus. We use the currencies of biomass and reproduction...

  • Soler-Jimenez L.C, Morales-Serna F.N, Aguirre-Macedo M.L, McLaughlin J.P, Jaramillo A.G, Shaw J.C, James A.K, Hechinger R.F, Kuris A.M, Lafferty K.D et al..  2019.  Parasitic copepods (Crustacea, Hexanauplia) on fishes from the lagoon flats of Palmyra Atoll, Central Pacific. Zookeys. :85-106.
    Abstract Summary:

    We surveyed copepods parasitic on the fishes at Palmyra, a remote atoll in the Central Indo-Pacific faunal region. In total, we collected 849 individual fish, representing 44 species, from the intertidal lagoon flats at Palmyra and recovered 17 parasitic copepod species. The parasitic copepods were: Orbitacolax williamsi on Mulloidichthys flavolineatus; Anuretes serratus on Acanthurus xanthopterus; Caligus confusus on Carangoides ferdau,...

  • Healy T.M, Schulte P.M.  2019.  Patterns of alternative splicing in response to cold acclimation in fish. Journal of Experimental Biology. 222
    Abstract Summary:

    Phenotypic plasticity is an important aspect of an organism's response to environmental change that often requires the modulation of gene expression. These changes in gene expression can be quantitative, as a result of increases or decreases in the amounts of specific transcripts, or qualitative, as a result of the expression of alternative transcripts from the same gene (e.g. via alternative splicing of pre-mRNAs). Although the role of...

  • Vanos J.K, Kosaka E., Iida A., Yokohari M., Middel A., Scott-Fleming J., Brown R.D.  2019.  Planning for spectator thermal comfort and health in the face of extreme heat: The Tokyo 2020 Olympic marathons. Science of the Total Environment. 657:904-917.
    Abstract Summary:

    The 2020 Olympic Games marathon will be run through the streets of Tokyo on the mornings of August 2nd and 9th, a time of year that is typically hot, sunny, and humid. Few studies have assessed the potential impact of extreme heat along the marathon course to understand the multiple factors (e.g., radiation, wind flow) affecting human thermal comfort (TC) as influenced by urban design and vegetation. The current research establishes a...

  • Fischer C., Lamer T., Wang W., McKinnie S.MK, Iturrioz X., Llorens-Cortes C., Oudit G.Y, Vederas JC.  2019.  Plasma kallikrein cleaves and inactivates apelin-17: Palmitoyl- and PEG-extended apelin-17 analogs as metabolically stable blood pressure-lowering agents. 166:119-124.
    Abstract Summary:

    Apelins are human peptide hormones with various physiological activities, including the moderation of cardiovascular, renal, metabolic and neurological function. Their potency is dependent on and limited by proteolytic degradation in the circulatory system. Here we identify human plasma kallikrein (KLKB1) as a protease that cleaves the first three N-terminal amino acids (KFR) of apelin-17. The cleavage kinetics are similar to neprilysin (NEP...

  • Feng D.M, Beighley E., Raoufi R., Melack J., Zhao Y.H, Iacobellis S., Cayan D.  2019.  Propagation of future climate conditions into hydrologic response from coastal southern California watersheds. Climatic Change. 153:199-218.
    Abstract Summary:

    As a biodiverse region under a Mediterranean climate with a mix of highly developed and natural watersheds, coastal Santa Barbara County (SB), located in southern California, is susceptible to the hydrologic impacts of climate change. This study investigates the potential changes in hydro-meteorological variables in this region as well as their societal and ecological implications for projected climate conditions during the twenty-first...

  • Heimbach P., Fukumori I., Hills C.N, Ponte R.M, Stammer D., Wunsch C., Campin J.M, Cornuelle B., Fenty I., Forget G. et al..  2019.  Putting it all together: Adding value to the global ocean and climate observing systems with complete self-consistent ocean state and parameter estimates. Frontiers in Marine Science. 6
    Abstract Summary:

    In 1999, the consortium on Estimating the Circulation and Climate of the Ocean (ECCO) set out to synthesize the hydrographic data collected by the World Ocean Circulation Experiment (WOCE) and the satellite sea surface height measurements into a complete and coherent description of the ocean, afforded by an ocean general circulation model. Twenty years later, the versatility of ECCO's estimation framework enables the production of global and...

  • Korte M., Brown M.C, Gunnarson S.R, Nilsson A, Panovska S., Wardinski I., Constable C.G.  2019.  Refining Holocene geochronologies using palaeomagnetic records. Quaternary Geochronology. 50:47-74.
    Abstract Summary:

    The aperiodic nature of geomagnetic field variations, both in intensity and direction, can aid in dating archaeological artefacts, volcanic rocks, and sediment records that carry a palaeomagnetic signal. The success of palaeomagnetic dating relies upon our knowledge of past field variations at specific locations. Regional archaeo- and palaeomagnetic reference curves and predictions from global geomagnetic field models provide our best...

  • Song HC, Byun G., Kim J.S.  2019.  Remote acoustic illumination using time reversal and a surface ship (L). Journal of the Acoustical Society of America. 145:1565-1568.
    Abstract Summary:

    Time-reversal (TR) transmission of the Green's function between a time-reversal mirror (TRM) and a probe source (PS) in an acoustic waveguide produces a spatio-temporal focus at the PS location. The TR focus then behaves as a virtual point source in the outbound direction with respect to the TRM. Further, a collection of adjacent TR focuses may constitute a virtual source array (VSA) that can serve as a remote platform, redirecting the...

  • Dias D.F, Subramanian A., Zanna L., Miller AJ.  2019.  Remote and local influences in forecasting Pacific SST: a linear inverse model and a multimodel ensemble study. Climate Dynamics. 52:3183-3201.
    Abstract Summary:

    A suite of statistical linear inverse models (LIMs) are used to understand the remote and local SST variability that influences SST predictions over the North Pacific region. Observed monthly SST anomalies in the Pacific are used to construct different regional LIMs for seasonal to decadal predictions. The seasonal forecast skills of the LIMs are compared to that from three operational forecast systems in the North American Multi-Model...

  • Gemba K.L, Nannuru S., Gerstoft P.  2019.  Robust ocean acoustic localization with sparse Bayesian learning. 13:49-60.
    Abstract Summary:

    Matched field processing (MFP) compares the measures to the modeled pressure fields received at an array of sensors to localize a source in an ocean waveguide. Typically, there are only a few sources when compared to the number of candidate source locations or range-depth cells. We use sparse Bayesian learning (SBL) to learn a common sparsity profile corresponding to the location of present sources. SBL performance is compared to traditional...

  • Abstract Summary:

    Analysis of the full genome of an environmentally unique, halotolerant Streptomyces sp. strain GSL-6C, isolated from the Great Salt Lake, revealed a gene cluster encoding the biosynthesis of the salinipeptins, D-amino-acid containing members of the rare linaridin subfamily of ribosomally synthesized and post-translationally modified peptides (RiPPs). The sequence organization of the unmodified amino acid residues in salinipeptins A D (1-4)...

  • Nie J., Xia Y., Hu S.N, Yuan W., Yang J., Ma D..  2019.  Similarity among atmospheric thermal stratifications over elevated surfaces under radiative-convective equilibrium. Geophysical Research Letters. 46:3512-3522.
    Abstract Summary:

    An air column under radiative-convective equilibrium is studied here to understand equilibrium climate over different surface elevations. Cloud-resolving model (CRM) simulations show that atmospheric thermal stratifications exhibit similar structures when expressed in sigma coordinates over varying surface elevations under radiative-convective equilibrium. A zero-buoyancy plume model that reproduces CRM results is used to interpret related...

  • Bakas N.A, Constantinou N.C, Ioannou P.J.  2019.  Statistical state dynamics of weak jets in barotropic beta-plane turbulence. Journal of the Atmospheric Sciences. 76:919-945.
    Abstract Summary:

    Zonal jets in a barotropic setup emerge out of homogeneous turbulence through a flow-forming instability of the homogeneous turbulent state (zonostrophic instability), which occurs as the turbulence intensity increases. This has been demonstrated using the statistical state dynamics (SSD) framework with a closure at second order. Furthermore, it was shown that for small supercriticality the flow-forming instability follows Ginzburg-Landau (G-...

  • Share P.E, Allam A.A, Ben-Zion Y., Lin F.C, Vernon FL.  2019.  Structural properties of the San Jacinto Fault Zone at Blackburn Saddle from seismic data of a dense linear array. Pure and Applied Geophysics. 176:1169-1191.
    Abstract Summary:

    We image the San Jacinto fault zone at Blackburn Saddle using earthquake waveforms recorded by a similar to 2-km across-fault linear array with 108 three-component sensors separated by similar to 10-30m. The length and spatiotemporal sampling of the array allow us to derive high-resolution information on the internal fault zone structure with spatial extent that can be merged with regional tomography models. Across-fault variations in...

  • Richert I., Yager P.L, Dinasquet J., Logares R., Riemann L., Wendeberg A., Bertilsson S., Scofield D.G.  2019.  Summer comes to the Southern Ocean: how phytoplankton shape bacterioplankton communities far into the deep dark sea. Ecosphere. 10
    Abstract Summary:

    During austral spring and summer, the coastal Antarctic experiences a sharp increase in primary production and a steepening of biotic and abiotic gradients that result from increased solar radiation and retreating sea ice. In one of the largest seasonally ice-free regions, the Amundsen Sea Polynya, pelagic samples were collected from 15 sites during a massive Phaeocystis antarctica bloom in 2010/2011. Along with a suite of other biotic and...

  • Highlighted Publication Marine observations map from JCOMMOPS
    Moore A.M, Martini M.J, Akella S., Arango H.G, Balmaseda M., Bertino L., Ciavatta S., Cornuelle B., Cummings J., Frolov S. et al..  2019.  Synthesis of ocean observations using data assimilation for operational, real-time and reanalysis systems: A more complete picture of the state of the ocean. Frontiers in Marine Science. 6
    Abstract Summary:

    Ocean data assimilation is increasingly recognized as crucial for the accuracy of real-time ocean prediction systems and historical re-analyses. The current status of ocean data assimilation in support of the operational demands of analysis, forecasting and reanalysis is reviewed, focusing on methods currently adopted in operational and real-time prediction systems. Significant challenges associated with the most commonly employed approaches...

  • Schlenger A.J, Libralato S., Ballance LT.  2019.  Temporal variability of primary production explains marine ecosystem structure and function. Ecosystems. 22:331-345.
    Abstract Summary:

    Understanding drivers of ecosystem structure and function is a pervasive goal in academic and applied research. We used 24 synthetic ecosystem-level indices derived from trophic models, and independently derived data for Net Primary Productivity, to investigate drivers of ecosystem structure and function for 43 marine ecosystems distributed in all oceans of the world and including coastal, estuaries, mid-ocean islands, open-ocean, coral reef...

  • Purkey S.G, Johnson G.C, Talley LD, Sloyan BM, Wijffels S.E, Smethie W., Mecking S., Katsumata K..  2019.  Unabated bottom water warming and freshening in the South Pacific Ocean. Journal of Geophysical Research-Oceans. 124:1778-1794.
    Abstract Summary:

    Abyssal ocean warming contributed substantially to anthropogenic ocean heat uptake and global sea level rise between 1990 and 2010. In the 2010s, several hydrographic sections crossing the South Pacific Ocean were occupied for a third or fourth time since the 1990s, allowing for an assessment of the decadal variability in the local abyssal ocean properties among the 1990s, 2000s, and 2010s. These observations from three decades reveal steady...

  • Decima M, Stukel M.R, Lopez-Lopez L., Landry MR.  2019.  The unique ecological role of pyrosomes in the Eastern Tropical Pacific. Limnology and Oceanography. 64:728-743.
    Abstract Summary:

    Pyrosomes are an important but often overlooked component of marine zooplankton communities, with limited existing information regarding their ecological and trophic roles in pelagic ecosystems. We present the first estimates of grazing and trophic interactions of the large tropical pyrosome, Pyrostremma spinosum, in the Eastern Tropical Pacific. While patchy in distribution, Pyrostremma spinosum's grazing impact was substantial, up to 17.5%...

  • Shrivastava M., Andreae M.O, Artaxo P., Barbosa H.MJ, Berg L.K, Brito J., Ching J., Easter RC, Fan J.W, Fast J.D et al..  2019.  Urban pollution greatly enhances formation of natural aerosols over the Amazon rainforest. Nature Communications. 10
    Abstract Summary:

    One of the least understood aspects in atmospheric chemistry is how urban emissions influence the formation of natural organic aerosols, which affect Earth's energy budget. The Amazon rainforest, during its wet season, is one of the few remaining places on Earth where atmospheric chemistry transitions between preindustrial and urban-influenced conditions. Here, we integrate insights from several laboratory measurements and simulate the...

  • Abstract Summary:

    Variation in thermal tolerance plays a key role in determining the biogeographic distribution of organisms. Consequently, identifying the mechanistic basis for thermal tolerance is necessary for understanding not only current species range limits but also the capacity for range limits to shift in response to climate change. Although variation in mitochondrial function likely contributes to variation in thermal tolerance, the extent to which...

  • Marcuson R., Gee J., Wei E., Driscoll N..  2019.  A 2000 year geomagnetic field record from the Gulf of Papua. Marine Geology. 408:48-66.
    Abstract Summary:

    A high resolution Holocene record of geomagnetic field direction and intensity in the Gulf of Papua was constructed using paleomagnetic data from eight piston cores collected in the region. The chronology of the cores was based largely on radiocarbon dates from benthic foraminifera. Correlation of seismic reflectors imaged in subbottom data between nearby cores was consistent with the chronostratigraphic framework based on radiocarbon dates...

  • Hammons J.C, Trzoss L., Jimenez P.C, Hirata A.S, Costa-Lotufo L.V, La Clair J.J, Fenical W.  2019.  Advance of seriniquinone analogues as melanoma agents. 10:186-190.
    Abstract Summary:

    Seriniquinone, a marine natural product, displayed potent cytotoxicity and selectivity against melanoma cancer cells. This selectivity, combined with a novel mode of action (MOA), prompted studies to translate a pharmacologically relevant lead. Herein, we report on structure-activity relationships (SARs), and provide a strategy to prepare analogues that retain activity and offer an improved water solubility and isomeric purity. From...

  • Hildebrand JA, Frasier K.E, Baumann-Pickering S., Wiggins SM, Merkens K.P, Garrison L.P, Soklevilla M.S, McDonald M.A.  2019.  Assessing seasonality and density from passive acoustic monitoring of signals presumed to be from pygmy and dwarf sperm whales in the Gulf of Mexico. Frontiers in Marine Science. 6
    Abstract Summary:

    Pygmy sperm whales (Kogia breviceps) and dwarf sperm whales (Kogia sima) are deep diving cetaceans that commonly strand along the coast of the southeast US, but that are difficult to study visually at sea because of their elusive behavior. Conventional visual surveys are thought to significantly underestimate the presence of Kogia and they have proven difficult to approach for tracking and tagging. An approach is presented for density...

  • Dayton PK, Oliver JS, Thrush S.F, Hammerstrom K.  2019.  Bacteria defend carrion from scavengers. Antarctic Science. 31:13-15.
    Abstract Summary:

    Carrion in the form of dead seal pups and algal mats placed on soft bottom habitats at Explorers Cove and Salmon Bay, McMurdo Sound, attract scavenging invertebrates that are driven away by hydrogen sulphide produced by sulphate-reducing bacteria sequestered below a layer of Beggiatoa/Thioploca-like filamentous bacteria. This system is usually found for lipid-rich marine mammal carrion, but also occurred with natural algal mats.


  • Chen S.J, Russell LM, Cappa CD, Zhang X.L, Kleeman M.J, Kumar A., Liu D., Ramanathana V..  2019.  Comparing black and brown carbon absorption from AERONET and surface measurements at wintertime Fresno. Atmospheric Environment. 199:164-176.
    Abstract Summary:

    The radiative impacts of black carbon (BC) and brown carbon (BrC) are widely recognized but remain highly uncertain. The Aerosol Robotic Network (AERONET) provides measurements of aerosol optical depth (AOD), aerosol absorption optical depth (AAOD), and other parameters. AERONET AAOD measurements have been used to estimate the relative contributions of BC and BrC to the total absorption at select sites and have the potential to be used across...

  • Eisenhofer R., Minich J.J, Marotz C., Cooper A., Knight R., Weyrich L.S.  2019.  Contamination in low microbial biomass microbiome studies: Issues and recommendations. Trends in Microbiology. 27:105-117.
    Abstract Summary:

    Next-generation sequencing approaches in microbiome research have allowed surveys of microbial communities, their genomes, and their functions with higher sensitivity than ever before. However, this sensitivity is a double-edged sword because these tools also efficiently detect contaminant DNA and cross-contamination, which can confound the interpretation of microbiome data. Therefore, there is an urgent need to integrate key controls into...

  • Abstract Summary:

    The green microalga, Tetraselmis suecica, is commonly used in scientific, industrial, and aquacultural purposes because of its high stress tolerance and ease of culture in wide spectrums of environments. We hypothesized that carotenoids help to protect Tetraselmis cells from environmental stress by regulating genes in biosynthetic pathways. Here, we determined three major carotenogenic genes, phytoene synthase (PSY), phytoene desaturase (PDS...

  • Abstract Summary:

    Coatings on nanoparticle (NP) surfaces play a key role in dictating their behavior in the environment. For metal oxide NPs, the physicochemical processes of dissolution, aggregation, and reactivity are all impacted by surface coatings. The current study focuses on adsorption and displacement reactions of different molecular and biological species representative of different coatings on TiO2 NP surfaces. These different species include...

  • Yarimizu K., Cruz-Lopez R., Garcia-Mendoza E., Edwards M., Carter ML, Carrano C.J.  2019.  Distribution of dissolved iron and bacteria producing the photoactive siderophore, vibrioferrin, in waters off Southern California and Northern Baja. 32:139-154.
    Abstract Summary:

    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...

  • Dhaneesha M., Hasin O., Sivakumar K.C, Ravinesh R., Naman C.B, Carmeli S., Sajeevan T.P.  2019.  DNA binding and molecular dynamic studies of polycyclic tetramate macrolactams (PTM) with potential anticancer activity isolated from a sponge-associated Streptomyces zhaozhouensis subsp. mycale subsp. nov. Marine Biotechnology. 21:124-137.
    Abstract Summary:

    A sponge-associated actinomycete (strain MCCB267) was isolated from a marine sponge Mycale sp. collected in the Indian Ocean off the Southeast coast of India. Phylogenetic studies of this strain using 16S rRNA gene sequencing showed high sequence similarity to Streptomyces zhaozhouensis. However, strain MCCB267 showed distinct physiological and biochemical characteristic features and was thus designated as S. zhaozhouensis subsp. mycale....

  • Murik O., Tirichine L., Prihoda J., Thomas Y., Araujo W.L, Allen A.E, Fernie A.R, Bowler C..  2019.  Downregulation of mitochondrial alternative oxidase affects chloroplast function, redox status and stress response in a marine diatom. New Phytologist. 221:1303-1316.
    Abstract Summary:

    Diatom dominance in contemporary aquatic environments indicates that they have developed unique and effective mechanisms to cope with the rapid and considerable fluctuations that characterize these environments. In view of their evolutionary history from a secondary endosymbiosis, inter-organellar regulation of biochemical activities may be of particular relevance. Diatom mitochondrial alternative oxidase (AOX) is believed to play a...

  • Wang H, Xie SP, Kosaka Y, Liu QY, Du Y..  2019.  Dynamics of Asian summer monsoon response to anthropogenic aerosol forcing. Journal of Climate. 32:843-858.
    Abstract Summary:

    Anthropogenic aerosols partially mask the greenhouse warming and cause the reduction in Asian summer monsoon precipitation and circulation. By decomposing the atmospheric change into the direct atmospheric response to radiative forcing and sea surface temperature (SST)-mediated change, the physical mechanisms for anthropogenic-aerosol-induced changes in the East Asian summer monsoon (EASM) and South Asian summer monsoon (SASM) are diagnosed....

  • Pommier A., Williams Q., Evans RL, Pal I., Zhang Z..  2019.  Electrical investigation of natural lawsonite and application to subduction contexts. Journal of Geophysical Research-Solid Earth. 124:1430-1442.
    Abstract Summary:

    We report an experimental investigation of the electrical properties of natural polycrystalline lawsonite from Reed Station, CA. Lawsonite represents a particularly efficient water reservoir in subduction contexts, as it can carry about 12wt% water and is stable over a wide pressure range. Experiments were performed from 300 to about 1325 degrees C and under pressure from 1 to 10GPa using a multi-anvil apparatus. We observe that temperature...

  • Mullineaux L.S, Metaxas A., Beaulieu S.E, Bright M., Gollner S., Grupe B.M, Herrera S., Kellner J.B, Levin L.A, Mitarai S. et al..  2018.  Exploring the ecology of deep-sea hydrothermal vents in a metacommunity framework. Frontiers in Marine Science. 5
    Abstract Summary:

    Species inhabiting deep-sea hydrothermal vents are strongly influenced by the geological setting, as it provides the chemical-rich fluids supporting the food web, creates the patchwork of seafloor habitat, and generates catastrophic disturbances that can eradicate entire communities. The patches of vent habitat host a network of communities (a metacommunity) connected by dispersal of planktonic larvae. The dynamics of the metacommunity are...

  • Wang Y.F, Day S.M, Denolle M.A.  2019.  Geometric controls on pulse-like rupture in a dynamic model of the 2015 Gorkha earthquake. Journal of Geophysical Research-Solid Earth. 124:1544-1568.
    Abstract Summary:

    The 15 April 2015 M-w 7.8 Nepal Gorkha earthquake occurred on a shallowly dipping portion of the Main Himalayan Thrust (MHT). Notable features of the event include (1) the dominance of a slip pulse of about 6-s duration that unlocked the lower edge of the MHT and (2) the near-horizontal fault geometry, which, combined with proximity of the free surface, allows surface-reflected phases to break the across-fault symmetries of the seismic...

  • Withers K.B, Olsen K.B, Day S.M, Shi Z.Q.  2019.  Ground Motion and Intraevent Variability from 3D Deterministic Broad-band (0-7.5 Hz) Simulations along a Nonplanar Strike-Slip Fault. Bulletin of the Seismological Society of America. 109:229-250.
    Abstract Summary:

    We model deterministic broadband (0-7.5 Hz) ground motion from an M-w 7.1 bilateral strike-slip earthquake scenario with dynamic rupture propagation along a rough-fault topography embedded in a medium including small-scale velocity and density perturbations. Spectral accelerations (SAs) at periods 0.2-3 s and Arias intensity durations show a similar distance decay (at the level of 1-2 interevent standard deviations above the median) when...

  • Abstract Summary:

    The total synthesis of majusculamide D (MJS-D) is described, a lipopentapeptide originally isolated from Lyngbya majuscula and reisolated from a Moorea sp. MJS-D possesses selective and potent cancer cell toxicity. A scalable and convergent strategy with a minimal number of purifications produced significant quantities of MJM-D for in vivo evaluations. The absolute configuration of the 1,3-dimethyl-octanamide motif was determined by synthesis...

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