Recent Publications

  • Murik O, Tirichine L, Prihoda J, Thomas Y, Araújo WL, Allen AE, Fernie AR, Bowler C.  2018.  Downregulation of mitochondrial alternative oxidase affects chloroplast function, redox status and stress response in a marine diatom. New Phytologist.
    Abstract Summary:

    Diatoms 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...

  • Pethybridge H., Choy C.A, Logan J.M, Allain V., Lorrain A., Bodin N., Somes C.J, Young J., Menard F., Langlais C. et al..  2018.  A global meta-analysis of marine predator nitrogen stable isotopes: Relationships between trophic structure and environmental conditions. Global Ecology and Biogeography. 27:1043-1055.
    Abstract Summary:

    Aim We examined potential environmental drivers of broad-scale spatial patterns in the trophic structure of marine ecosystems as represented by nitrogen stable isotopes in globally distributed marine predators. Additionally, we assessed the effects of spatial scale on the predictive capabilities of environmental variables. LocationTime periodGlobal oceans. 2000 to 2015. Major taxa studiedMethodsTunas: Thunnus albacares, Thunnus obesus,...

  • Aburto-Oropeza O, Johnson A.F, Agha M., Allen E.B, Allen M.F, Gonzalez J.A, Moreno D.MA, Beas-Luna R., Butterfield S., Caetano G. et al..  2018.  Harnessing cross-border resources to confront climate change. Environmental Science & Policy. 87:128-132.
    Abstract Summary:

    The US and Mexico share a common history in many areas, including language and culture. They face ecological changes due to the increased frequency and severity of droughts and rising energy demands; trends that entail economic costs for both nations and major implications for human wellbeing. We describe an ongoing effort by the Environment Working Group (EWG), created by The University of California's UC-Mexico initiative in 2015, to...

  • Highlighted Publication Sampling nets photographed from under water
    McClatchie S., Gao J., Drenkard E.J, Thompson A.R, Watson W, Ciannelli L., Bograd SJ, Thorson J.T.  2018.  Interannual and secular variability of larvae of mesopelagic and forage fishes in the southern California Current System. Journal of Geophysical Research-Oceans. 123:6277-6295.
    Abstract Summary:

    We used univariate and multivariate spatiotemporal delta models to quantify changes in the distribution of ichthyoplankton in the southern California Current System from 1951 to 2016. We focus on mesopelagic species, because they are most abundant, and on northern anchovy (Engraulis mordax), Pacific sardine (Sardinops sagax), and Pacific hake (Merluccius productus), because they are important commercial and forage fish species. Univariate...

  • Luo M., Algeo T.J, Tong H.P, Gieskes J., Chen L.Y, Shi X.F, Chen D.F.  2018.  More reducing bottom-water redox conditions during the Last Glacial Maximum in the southern Challenger Deep (Mariana Trench, western Pacific) driven by enhanced productivity. Deep-Sea Research Part Ii-Topical Studies in Oceanography. 155:70-82.
    Abstract Summary:

    The modern southern Mariana Trench is characterized by oligotrophic surface waters, resulting in low primary productivity and well-oxygenated bottom waters. This study investigates changes in the redox conditions of bottom waters in the southern Mariana Trench during the Last Glacial Maximum (LGM) and their potential causes. We measured major, trace, and rare earth elements (REE) in three gravity cores (GC03, GC04, and GC05) and one box core...

  • Siegelman-Charbit L., Koslow JA, Jacox M.G, Hazen E.L, Bograd SJ, Miller E.F.  2018.  Physical forcing on fish abundance in the southern California Current System. Fisheries Oceanography. 27:475-488.
    Abstract Summary:

    The California Current System (CCS) is an eastern boundary current system with strong biological productivity largely due to seasonal wind-driven upwelling and transport of the California Current (CC). Two independent, yet complementary time series, CalCOFI ichthyoplankton surveys and sampling of southern California power plant cooling-water intakes, have indicated that an assemblage of predominantly cool-water affinity fishes spanning...

  • Matsumoto H, Young A.  2018.  Automated cobble mapping of a mixed sand-cobble beach using a mobile LiDAR system. Remote Sensing. 10:1253.
    Abstract Summary:

    Cobbles (64–256 mm) are found on beaches throughout the world, influence beach morphology, and can provide shoreline stability. Detailed, frequent, and spatially large-scale quantitative cobble observations at beaches are vital toward a better understanding of sand-cobble beach systems. This study used a truck-mounted mobile terrestrial LiDAR system and a raster-based classification approach to map cobbles automatically. Rasters of LiDAR...

  • Bender S.J, Moran D.M, McIlvin M.R, Zheng H., McCrow J.P, Badger J., DiTullio G.R, Allen A.E, Saito M.A.  2018.  Colony formation in Phaeocystis antarctica: connecting molecular mechanisms with iron biogeochemistry. Biogeosciences. 15:4923-4942.
    Abstract Summary:

    Phaeocystis antarctica is an important phytoplankter of the Ross Sea where it dominates the early season bloom after sea ice retreat and is a major contributor to carbon export. The factors that influence Phaeocystis colony formation and the resultant Ross Sea bloom initiation have been of great scientific interest, yet there is little known about the underlying mechanisms responsible for these phenomena. Here, we present laboratory and field...

  • Wing S.R, Leichter J.J, Wing L.C, Stokes D., Genovese S.J, McMullin R.M, Shatova O.A.  2018.  Contribution of sea ice microbial production to Antarctic benthic communities is driven by sea ice dynamics and composition of functional guilds. Global Change Biology. 24:3642-3653.
    Abstract Summary:

    Organic matter produced by the sea ice microbial community (SIMCo) is an important link between sea ice dynamics and secondary production in near-shore food webs of Antarctica. Sea ice conditions in McMurdo Sound were quantified from time series of MODIS satellite images for Sept. 1 through Feb. 28 of 2007-2015. A predictable sea ice persistence gradient along the length of the Sound and evidence for a distinct change in sea ice dynamics in...

  • Edmunds P.J, McIlroy S.E, Adjeroud M., Ang P., Bergman J.L, Carpenter R.C, Coffroth M.A, Fujimura A.G, Hench J.L, Holbrook S.J et al..  2018.  Critical information gaps impeding understanding of the role of larval connectivity among coral reef islands in an era of global change. Frontiers in Marine Science. 5
    Abstract Summary:

    Populations of marine organisms on coral reef islands (CRI) are connected in space and time by seawater that transports propagules of plants, animals, and algae. Yet, despite this reality, it is often assumed that routine replenishment of populations of marine organisms on CRI is supported by locally-sourced propagules (hereafter, larvae). Following large disturbances, however, distantly-sourced larvae from less disturbed CRI within a...

  • Navarro M.O, Parnell P.E, Levin L.A.  2018.  Essential market squid (Doryteuthis opalescens) embryo habitat: A baseline for anticipated ocean climate change. Journal of Shellfish Research. 37:601-614.
    Abstract Summary:

    The market squid Doryteuthis opalescens deposits embryo capsules onto the continental shelf from Baja California to southern Alaska, yet little is known about the environment of embryo habitat. This study provides a baseline of environmental data and insights on factors underlying site selection for embryo deposition off southern California, and defines current essential embryo habitat using (1) remotely operated vehicle-supported surveys of...

  • Sathasivam R., Guo R., Wang H, Lim W.A, Ki J.S.  2018.  Expressed sequence tag library of the marine green alga Tetraselmis suecica: a focus on stress-related genes for marine pollution. Journal of Applied Phycology. 30:2387-2402.
    Abstract Summary:

    The marine green microalga, Tetraselmis suecica, is an important food source for aquaculture, lipid source for biofuel production, and a potential model organism for toxicity assays because of its rapid growth and ability to produce useful chemicals. In order to gain molecular toxicogenomic insights, we determined expressed sequence tags (ESTs) of T. suecica by pyrosequencing, and attained 741 K reads, including 290 Mb of cDNA information....

  • Schlitzer R., Anderson R.F, Dodas E.M, Lohan M., Geibere W., Tagliabue A., Bowie A., Jeandel C., Maldonado M.T, Landing W.M et al..  2018.  The GEOTRACES Intermediate Data Product 2017. Chemical Geology. 493:210-223.
    Abstract Summary:

    The GEOTRACES Intermediate Data Product 2017 (IDP2017) is the second publicly available data product of the international GEOTRACES programme, and contains data measured and quality controlled before the end of 2016. The IDP2017 includes data from the Atlantic, Pacific, Arctic, Southern and Indian oceans, with about twice the data volume of the previous IDP2014. For the first time, the IDP2017 contains data for a large suite of biogeochemical...

  • Cazenave A., Meyssignac B., Ablain M., Balmaseda M., Bamber J., Barletta V., Beckley B., Benveniste J., Berthier E, Blazquez A. et al..  2018.  Global sea-level budget 1993-present. Earth System Science Data. 10:1551-1590.
    Abstract Summary:

    Global mean sea level is an integral of changes occurring in the climate system in response to unforced climate variability as well as natural and anthropogenic forcing factors. Its temporal evolution allows changes (e.g.,acceleration) to be detected in one or more components. Study of the sea-level budget provides constraints on missing or poorly known contributions, such as the unsurveyed deep ocean or the still uncertain land water...

  • Ashford O.S, Kenny A.J, Frojan C, Bonsall M.B, Horton T., Brandt A., Bird G.J, Gerken S., Rogers A.D.  2018.  Phylogenetic and functional evidence suggests that deep-ocean ecosystems are highly sensitive to environmental change and direct human disturbance. Proceedings of the Royal Society B-Biological Sciences. 285
    Abstract Summary:

    An understanding of the balance of interspecific competition and the physical environment in structuring organismal communities is crucial because those communities structured primarily by their physical environment typically exhibit greater sensitivity to environmental change than those structured predominantly by competitive interactions. Here, using detailed phylogenetic and functional information, we investigate this question in...

  • Sato K.N, Andersson AJ, Day JMD, Taylor J.RA, Frank M.B, Jung J.Y, McKittrick J., Levin L.A.  2018.  Response of sea urchin fitness traits to environmental gradients across the Southern California oxygen minimum zone. Frontiers in Marine Science. 5
    Abstract Summary:

    Marine calcifiers are considered to be among the most vulnerable taxa to climate-forced environmental changes occurring on continental margins with effects hypothesized to occur on microstructural, biomechanical, and geochemical properties of carbonate structures. Natural gradients in temperature, salinity, oxygen, and pH on an upwelling margin combined with the broad depth distribution (100-1,100 m) of the pink fragile sea urchin,...

  • Rosencranz J.A, Thorne K.M, Buffington K.J, Takekawa J.Y, Hechinger R.F, Stewart T.E, Ambrose R.F, MacDonald G.M, Holmgren M.A, Crooks J.A et al..  2018.  Sea-level rise, habitat loss, and potential extirpation of a salt marsh specialist bird in urbanized landscapes. Ecology and Evolution. 8:8115-8125.
    Abstract Summary:

    Sea-level rise (SLR) impacts on intertidal habitat depend on coastal topology, accretion, and constraints from surrounding development. Such habitat changes might affect species like Belding's savannah sparrows (Passerculus sandwichensis beldingi; BSSP), which live in high-elevation salt marsh in the Southern California Bight. To predict how BSSP habitat might change under various SLR scenarios, we first constructed a suitability model by...

  • Spackeen JL, Bronk DA, Sipler RE, Bertrand EM, Hutchins DA, Allen AE.  2018.  Stoichiometric N:P Ratios, Temperature, and Iron Impact Carbon and Nitrogen Uptake by Ross Sea Microbial Communities. Journal of Geophysical Research: Biogeosciences.
    Abstract Summary:

    APhytoplankton growth in the seasonally productive Southern Ocean is typically limited by iron (Fe). In the next century, however, Fe inputs and temperature are predicted to increase. Dissolved concentrations of nitrogen (N) and phosphorus (P) may also change due to physical and biological drivers, altering the stoichiometric N:P ratio of the water column. Two separate experiments were conducted to study how these predicted changes will...

  • McGinty N., Barton A.D, Record N.R, Finkel Z.V, Irwin A.J.  2018.  Traits structure copepod niches in the North Atlantic and Southern Ocean. Marine Ecology Progress Series. 601:109-126.
    Abstract Summary:

    Realised niches describe the environmental and biotic conditions that a species occupies. Among marine zooplankton, species traits, including body size, dietary mode (herbivore, omnivore, or carnivore), and diapause strategy are expected to influence the realised niche of a species. To date, realised niches are known for only a small number of copepod species. Here we quantify the realised niches of 88 copepod species measured by the...

  • Highlighted Publication
    Chenillat F, Franks PJS, Capet X, Riviere P, Grima N., Blanke B, Combes V.  2018.  Eddy properties in the Southern California Current System. Ocean Dynamics. 68:761-777.
    Abstract Summary:

    The California Current System (CCS) is an eastern boundary upwelling system characterized by strong eddies that are often generated at the coast. These eddies contribute to intense, long-distance cross-shelf transport of upwelled water with enhanced biological activity. However, the mechanisms of formation of such coastal eddies, and more importantly their capacity to trap and transport tracers, are poorly understood. Their unpredictability...

  • Merrifield M.A, Thompson P.R.  2018.  Interdecadal sea level variations in the pacific: Distinctions between the tropics and extratropics. Geophysical Research Letters. 45:6604-6610.
    Abstract Summary:

    Long tide gauge records from Fremantle and San Diego are used to examine interdecadal sea level fluctuations and their relationship to Pacific climate variability. The sea level difference between the tide gauges and the Southern Oscillation Index (SOI) provide a consistent depiction of trade wind variations along the equator over the past century. The sea level difference and SOI exhibit weak interdecadal variability prior to the late 1970s...

  • Collins J.R, Fredricks H.F, Bowman J.S, Ward C.P, Moreno C., Longnecker K., Marchetti A., Hansel C.M, Ducklow H.W, Van Mooy B.AS.  2018.  The molecular products and biogeochemical significance of lipid photooxidation in West Antarctic surface waters. Geochimica Et Cosmochimica Acta. 232:244-264.
    Abstract Summary:

    The seasonal depletion of stratospheric ozone over the Southern Hemisphere allows abnormally high doses of ultraviolet radiation (UVR) to reach surface waters of the West Antarctic Peninsula (WAP) in the austral spring, creating a natural laboratory for the study of lipid photooxidation in the shallow mixed layer of the marginal ice zone. The photooxidation of lipids under such conditions has been identified as a significant source of stress...

  • Bowman J.S, Kavanaugh M.T, Doney SC, Ducklow H.W.  2018.  Recurrent seascape units identify key ecological processes along the western Antarctic Peninsula. Global Change Biology. 24:3065-3078.
    Abstract Summary:

    The western Antarctic Peninsula (WAP) is a bellwether of global climate change and natural laboratory for identifying interactions between climate and ecosystems. The Palmer Long-Term Ecological Research (LTER) project has collected data on key ecological and environmental processes along the WAP since 1993. To better understand how key ecological parameters are changing across space and time, we developed a novel seascape classification...

  • Dunn D.C, Van Dover C.L, Etter R.J, Smith C.R, Levin L.A, Morato T., Colaco A., Dale A.C, Gebruk A.V, Gjerde K.M et al..  2018.  A strategy for the conservation of biodiversity on mid-ocean ridges from deep-sea mining. Science Advances. 4
    Abstract Summary:

    Mineral exploitation has spread from land to shallow coastal waters and is now planned for the offshore, deep seabed. Large seafloor areas are being approved for exploration for seafloor mineral deposits, creating an urgent need for regional environmental management plans. Networks of areas where mining and mining impacts are prohibited are key elements of these plans. We adapt marine reserve design principles to the distinctive biophysical...

  • Miloslavich P., Bax N.J, Simmons S.E, Klein E., Appeltans W., Aburto-Oropeza O, Garcia M.A, Batten S.D, Benedetti-Cecchi L., Checkley DM et al..  2018.  Essential ocean variables for global sustained observations of biodiversity and ecosystem changes. Global Change Biology. 24:2416-2433.
    Abstract Summary:

    Sustained observations of marine biodiversity and ecosystems focused on specific conservation and management problems are needed around the world to effectively mitigate or manage changes resulting from anthropogenic pressures. These observations, while complex and expensive, are required by the international scientific, governance and policy communities to provide baselines against which the effects of human pressures and climate change may...

  • Cefarelli AO, Mascioni M., Simonato J., Almandoz GO, Vernet M.  2018.  Haslea crucigeroides var. australis, var. nov. (Bacillariophyta), a new marine diatom from southern South America and Antarctica. 357:179-188.
    Abstract Summary:

    A new variety of the marine diatom Haslea crucigeroides, H. crucigeroides var. australis, var. nov., is described here based on phytoplankton samples collected in sub-Antarctic coastal waters of the southern South America and Antarctica. The new taxon was characterized by using light and electron microscopy, and the holotype of H. crucigeroides, the only existing material type, was analyzed with light microscopy. Haslea crucigeroides var....

  • Abstract Summary:

    This work developed a laboratory prototype methodology for cost-effective, water-sparing drip-irrigation of seaweeds, as a model for larger-scale, on-land commercial units, which we envision as semi-automated, inexpensive polyethylene sheet-covered bow-framed greenhouses with sloping plastic covered floors, water-collecting sumps, and pumped recycling of culture media into overhead low-pressure drip emitters. Water droplets form on the...

  • Cohen R.E, James C.C, Lee A., Martinelli M.M, Muraoka W.T, Ortega M., Sadowski R., Starkey L., Szesciorka A.R, Timko S.E et al..  2018.  Marine host-pathogen dynamics: Influences of global climate change. Oceanography. 31:182-193.
    Abstract Summary:

    Host-pathogen relationships are an important subset of interspecies interactions that are capable of influencing population dynamics, community structure, and biogeochemical cycles. Relationships between hosts and pathogens are expected to shift in response to global climate change. Atmospheric and oceanic warming is already affecting many ecosystems, perhaps most markedly those in marine environments. Case studies illustrate some impacts...

  • Rathburn A.E, Willingham J., Ziebis W., Burkett A.M, Corliss B.H.  2018.  A new biological proxy for deep-sea paleo-oxygen: Pores of epifaunal benthic foraminifera. Scientific Reports. 8
    Abstract Summary:

    The negative consequences of fossil fuel burning for the oceans will likely include warming, acidification and deoxygenation, yet predicting future deoxygenation is difficult. Sensitive proxies for oxygen concentrations in ancient deep-ocean bottom-waters are needed to learn from patterns of marine deoxygenation during global warming conditions in the geological past. Understanding of past oxygenation effects related to climate change will...

  • Ludka B.C, Guza RT, O'Reilly W.C.  2018.  Nourishment evolution and impacts at four southern California beaches: A sand volume analysis. Coastal Engineering. 136:96-105.
    Abstract Summary:

    Four southern California beaches were nourished with offshore sand placed as subaerial pads several meters thick, m wide, and spanning between 500 and 1500 m alongshore. Three nourishments constructed with coarser than native sand, placed in 2012 at Imperial, Cardiff and Solana Beaches, elevated subaerial sand volumes for several years even when exposed to the energetic winter waves of the 2015-16 El Nifio, followed by a stormy 2016-17 winter...

  • Randelhoff A., Reigstad M., Chierici M., Sundfjord A., Ivanov V., Cape M, Vernet M, Tremblay J.E, Bratbak G., Kristiansen S..  2018.  Seasonality of the physical and biogeochemical hydrography in the inflow to the Arctic Ocean through Fram Strait. Frontiers in Marine Science. 5
    Abstract Summary:

    Eastern Fram Strait and the shelf slope region north of Svalbard is dominated by the advection of warm, salty and nutrient-rich Atlantic Water (AW). This oceanic heat contributes to keeping the area relatively free of ice. The last years have seen a dramatic decrease in regional sea ice extent, which is expected to drive large increases in pelagic primary production and thereby changes in marine ecology and nutrient cycling. In a concerted...

  • Huang X., Rippy MA, Mehring A.S, Winfrey B.K, Jiang S.C, Grant S.B.  2018.  Shifts in dissolved organic matter and microbial community composition are associated with enhanced removal of fecal pollutants in urban stormwater wetlands. Water Research. 137:310-323.
    Abstract Summary:

    Constructed stormwater wetlands provide a host of ecosystem services, including potentially pathogen removal. We present results from a multi-wetland study that integrates across weather, chemical, microbiological and engineering design variables in order to identify patterns of microbial contaminant removal from inlet to outlet within wetlands and key drivers of those patterns. One or more microbial contaminants were detected at the inlet of...

  • Biard T., Krause J.W, Stukel M.R, Ohman MD.  2018.  The significance of giant phaeodarians (rhizaria) to biogenic silica export in the California Current ecosystem. Global Biogeochemical Cycles. 32:987-1004.
    Abstract Summary:

    In marine ecosystems, many planktonic organisms precipitate biogenic silica (bSiO(2)) to build silicified skeletons. Among them, giant siliceous rhizarians (>500 mu m), including Radiolaria and Phaeodaria, are important contributors to oceanic carbon pools but little is known about their contribution to the marine silica cycle. We report the first analyses of giant phaeodarians to bSiO(2) export in the California Current Ecosystem. We...

  • Du N., Gholami P., Kline DI, Dupont C.L, Dickson AG, Mendola D., Martz T., Allen A.E, Mitchell B.G.  2018.  Simultaneous quantum yield measurements of carbon uptake and oxygen evolution in microalgal cultures. Plos OnePlos One. 13
    Abstract Summary:

    The photosynthetic quantum yield (F), defined as carbon fixed or oxygen evolved per unit of light absorbed, is a fundamental but rarely determined biophysical parameter. A method to estimate Phi for both net carbon uptake and net oxygen evolution simultaneously can provide important insights into energy and mass fluxes. Here we present details for a novel system that allows quantification of carbon fluxes using pH oscillation and simultaneous...

  • Stevenson S., Powell B., Cobb K., Nusbaumer J., Merrifield M., Noone D..  2018.  Twentieth century seawater delta O-18 dynamics and implications for coral-based climate reconstruction. 33:606-625.
    Abstract Summary:

    The oxygen isotopic composition of tropical coral skeletons (delta O-18) is a crucial source of information on past El Nino/Southern Oscillation behavior. Both temperature and the delta O-18 of the surrounding seawater delta O-18(sw) ) affect coral delta O-18; a linear proportionality with delta O-18(sw) is often used to infer past salinity variations, but the degree to which dynamical influences on delta O-18(sw) may affect that relationship...

  • Sato K.N, Powell J., Rudie D., Levin L.A.  2018.  Evaluating the promise and pitfalls of a potential climate change-tolerant sea urchin fishery in southern California. Ices Journal of Marine Science. 75:1029-1041.
    Abstract Summary:

    Marine fishery stakeholders are beginning to consider and implement adaptation strategies in the face of growing consumer demand and potential deleterious climate change impacts such as ocean warming, ocean acidification, and deoxygenation. This study investigates the potential for development of a novel climate change-tolerant sea urchin fishery in southern California based on Strongylocentrotus fragilis (pink sea urchin), a deep-sea species...

  • Hofmeister J.KK, Kawana S.K, Walker B.J, Catton C.A, Taniguchi I., Stein D.M, Sowul K., Rogers-Bennett L..  2018.  Temporal and spatial patterns in behavioral responses of marine predators to a sudden influx of abalone prey (Haliotis rufescens). Hydrobiologia. 813:123-136.
    Abstract Summary:

    Predator-prey interactions exist on a variety of spatial and temporal scales; one of the earliest measurable responses to changes in these interactions is behavior. We examined the behavior of southern California kelp forest predators in response to a concentrated increase in the abundance of abalone during a restoration stocking experiment. We tested three hypotheses: (1) kelp forest predator density will increase following abalone stocking...

  • Abstract Summary:

    Anthropogenic impacts on marine environments can be far-reaching and variable, and in an effort to mitigate these impacts, marine protected areas (MPAs) have been established globally. Indirect effects of MPAs on marine food webs and consumer behavior can be revealed through the diet of generalist predators, like octopuses, since their diet is a reflection of both preference and prey availability. Octopuses (Octopus bimaculatus Verrill, 1883...

  • Jessica M, R. MMatthew, K. CTeresa.  2018.  Interfacial form stress in the Southern Ocean state estimate. Journal of Geophysical Research: Oceans. 123:3368-3385.
    Abstract Summary:

    The wind stress that drives the Antarctic Circumpolar Current (ACC) exits the fluid via topographic form stress (TFS) at the sea floor; interfacial form stress (IFS) is thought to carry much of this momentum from source to sink. These form stresses combine to help set the strength and structure of the Southern Ocean meridional overturning circulation (MOC), a key nexus of heat and gas exchange between the deep ocean and the atmosphere. For...

  • Netburn A.N, Koslow JA.  2018.  Mesopelagic fish assemblages across oceanic fronts: A comparison of three frontal systems in the southern California Current Ecosystem. Deep-Sea Research Part I-Oceanographic Research Papers. 134:80-91.
    Abstract Summary:

    With strong horizontal gradients in physical properties, oceanic frontal regions can lead to disproportionately high biological productivity. We examined cross-frontal changes in mesopelagic fish assemblages at three separate frontal systems in the southern California Current Ecosystem (CCE) as part of the CCE Long Term Ecological Research program: the A-Front sampled in October 2008, the C-Front in June/July 2011, and the E-Front in July/...

  • Haver S.M, Gedamke J., Hatch L.T, Dziak R.P, Van Parijs S., McKenna MF, Barlow J, Berchok C., DiDonato E., Hanson B. et al..  2018.  Monitoring long-term soundscape trends in US Waters: The NOAA/NPS Ocean Noise Reference Station Network. Marine Policy. 90:6-13.
    Abstract Summary:

    The National Oceanic and Atmospheric Administration (NOAA)/National Park Service (NPS) Ocean Noise Reference Station (NRS) Network is an array of currently twelve calibrated autonomous passive acoustic recorders. The first NRS was deployed in June 2014, and eleven additional stations were added to the network during the following two years. The twelve stations record data that can be used to quantify baseline levels and multi-year trends in...

  • Kahru M, Elmgren R., Di Lorenzo E, Savchuk O..  2018.  Unexplained interannual oscillations of cyanobacterial blooms in the Baltic Sea. Scientific Reports. 8
    Abstract Summary:

    Population oscillations in multi-species or even single species systems are well-known but have rarely been detected at the lower trophic levels in marine systems. Nitrogen fixing cyanobacteria are a major component of the Baltic Sea ecosystem and sometimes form huge surface accumulations covering most of the sea surface. By analysing a satellite-derived 39-year (1979-2017) data archive of surface cyanobacteria concentrations we have found...

  • Gormley K., McLellan F., McCabe C., Hinton C., Ferris J., Kline DI, Scott B.E.  2018.  Automated image analysis of offshore infrastructure marine biofouling. 6
    Abstract Summary:

    In the UK, some of the oldest oil and gas installations have been in the water for over 40 years and have considerable colonisation by marine organisms, which may lead to both industry challenges and/or potential biodiversity benefits (e.g., artificial reefs). The project objective was to test the use of an automated image analysis software (CoralNet) on images of marine biofouling from offshore platforms on the UK continental shelf, with the...

  • Highlighted Publication P. tricornutum
    McQuaid JB, Kustka AB, Oborník M, Horák A, McCrow JP, Karas BJ, Zheng H, Kindeberg T, Andersson AJ, Barbeau KA et al..  2018.  Carbonate-sensitive phytotransferrin controls high-affinity iron uptake in diatoms. Nature. 555:534.
    Abstract Summary:

    In vast areas of the ocean, the scarcity of iron controls the growth and productivity of phytoplankton. Although most dissolved iron in the marine environment is complexed with organic molecules, picomolar amounts of labile inorganic iron species (labile iron) are maintained within the euphotic zone and serve as an important source of iron for eukaryotic phytoplankton and particularly for diatoms. Genome-enabled studies of labile iron...

  • Niner H.J, Ardron J.A, Escobar E.G, Gianni M., Jaeckel A., Jones D.OB, Levin L.A, Smith C.R, Thiele T., Turner P.J et al..  2018.  Deep-sea mining with no net loss of biodiversity-an impossible aim. Frontiers in Marine Science. 5
    Abstract Summary:

    Deep-sea mining is likely to result in biodiversity loss, and the significance of this to ecosystem function is not known. "Out of kind" biodiversity offsets substituting one ecosystem type (e.g., coral reefs) for another (e.g., abyssal nodule fields) have been proposed to compensate for such loss. Here we consider a goal of no net loss (NNL) of biodiversity and explore the challenges of applying this aim to deep seabed mining, based on the...

  • Briseno-Avena C., Franks PJS, Roberts P.LD, Jaffe J.S.  2018.  A diverse group of echogenic particles observed with a broadband, high frequency echosounder. Ices Journal of Marine Science. 75:471-482.
    Abstract Summary:

    In 1980, Holliday and Pieper stated: "Most sound scattering in the ocean volume can be traced to a biotic origin." However, most of the bio-acoustics research in the past three decades has focused on only a few groups of organisms. Targets such as small gelatinous organisms, marine snow, and phytoplankton, e.g. have been generally to be considered relatively transparent to acoustic waves due to their sizes and relatively low sound speed and...

  • Rastogi A, Maheswari U, Dorrell RG, Vieira FRocha Jime, Maumus F, Kustka A, McCarthy J, Allen AE, Kersey P, Bowler C et al..  2018.  Integrative analysis of large scale transcriptome data draws a comprehensive landscape of Phaeodactylum tricornutum genome and evolutionary origin of diatoms. Scientific Reports. 8:4834.
    Abstract Summary:

    Diatoms are one of the most successful and ecologically important groups of eukaryotic phytoplankton in the modern ocean. Deciphering their genomes is a key step towards better understanding of their biological innovations, evolutionary origins, and ecological underpinnings. Here, we have used 90 RNA-Seq datasets from different growth conditions combined with published expressed sequence tags and protein sequences from multiple taxa to...

  • Highlighted Publication
    Abstract Summary:

    We used a combination of epifluorescence microscopy and flow cytometry to investigate variability of phytoplankton biomass and size structure with ocean richness, measured as autotrophic carbon (AC) or chlorophyll a (chl a). Samples were collected from mixed layers of 4 North Pacific ecosystems: the California Current (CCE), Equatorial Pacific, Costa Rica Dome, and subtropical gyre (station ALOHA). Both nano- (2-20 mu m) and...

  • Roncalli V., Cieslak M.C, Sommer S.A, Hoperoft R.R, Lenz P.H.  2018.  De novo transcriptome assembly of the calanoid copepod Neocalanus flemingeri: A new resource for emergence from diapause. 37:114-119.
    Abstract Summary:

    Copepods, small planktonic crustaceans, are key links between primary producers and upper trophic levels, including many economically important fishes. In the subarctic North Pacific, the life cycle of copepods like Neocalanus flemingeri includes an ontogenetic migration to depth followed by a period of diapause (a type of dormancy) characterized by arrested development and low metabolic activity. The end of diapause is marked by the...

  • Berg C, Dupont CL, Asplund-Samuelsson J, Celepli NA, Eiler A, Allen AE, Ekman M, Bergman B, Ininbergs K.  2018.  Dissection of microbial community functions during a cyanobacterial bloom in the Baltic Sea via metatranscriptomics. Frontiers in Marine Science. 5
    Abstract Summary:

    Marine and brackish surface waters are highly dynamic habitats that undergo repeated seasonal variations in microbial community composition and function throughout time. While succession of the various microbial groups has been well investigated, little is known about the underlying gene-expression of the microbial community. We investigated microbial interactions via metatranscriptomics over a spring to fall seasonal cycle in the brackish...

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