93 results found
Lacerda ALDF, Rodrigues LDS, van Sebille E, et al., 2019, Plastics in sea surface waters around the Antarctic Peninsula., Sci Rep, Vol: 9
Although marine plastic pollution has been the focus of several studies, there are still many gaps in our understanding of the concentrations, characteristics and impacts of plastics in the oceans. This study aimed to quantify and characterize plastic debris in oceanic surface waters of the Antarctic Peninsula. Sampling was done through surface trawls, and mean debris concentration was estimated at 1,794 items.km-2 with an average weight of 27.8 g.km-2. No statistical difference was found between the amount of mesoplastics (46%) and microplastics (54%). We found hard and flexible fragments, spheres and lines, in nine colors, composed mostly of polyurethane, polyamide, and polyethylene. An oceanographic dispersal model showed that, for at least seven years, sampled plastics likely did not originate from latitudes lower than 58°S. Analysis of epiplastic community diversity revealed bacteria, microalgae, and invertebrate groups adhered to debris. Paint fragments were present at all sampling stations and were approximately 30 times more abundant than plastics. Although paint particles were not included in plastic concentration estimates, we highlight that they could have similar impacts as marine plastics. We call for urgent action to avoid and mitigate plastic and paint fragment inputs to the Southern Ocean.
McInnes AS, Laczka OF, Baker KG, et al., 2019, Live cell analysis at sea reveals divergent thermal performance between photosynthetic ocean microbial eukaryote populations., ISME J
Experimentation at sea provides insight into which traits of ocean microbes are linked to performance in situ. Here we show distinct patterns in thermal tolerance of microbial phototrophs from adjacent water masses sampled in the south-west Pacific Ocean, determined using a fluorescent marker for reactive oxygen species (ROS). ROS content of pico-eukaryotes was assessed after 1, 5 and 25 h of incubation along a temperature gradient (15.6-32.1 °C). Pico-eukaryotes from the East Australian Current (EAC) had relatively constant ROS and showed greatest mortality after 25 h at 7 °C below ambient, whereas those from the Tasman Sea had elevated ROS in both warm and cool temperature extremes and greatest mortality at temperatures 6-10 °C above ambient, interpreted as the outcome of thermal stress. Tracking of water masses within an oceanographic circulation model showed populations had distinct thermal histories, with EAC pico-eukaryotes experiencing higher average temperatures for at least 1 week prior to sampling. While acclimatization and community assembly could both influence biological responses, this study clearly demonstrates that phenotypic divergence occurs along planktonic drift trajectories.
Onink V, Wichmann D, Delandmeter P, et al., 2019, The Role of Ekman Currents, Geostrophy, and Stokes Drift in the Accumulation of Floating Microplastic, Journal of Geophysical Research: Oceans, ISSN: 2169-9275
©2019. The Authors. Floating microplastic in the oceans is known to accumulate in the subtropical ocean gyres, but unclear is still what causes that accumulation. We investigate the role of various physical processes, such as surface Ekman and geostrophic currents, surface Stokes drift, and mesoscale eddy activity, on the global surface distribution of floating microplastic with Lagrangian particle tracking using GlobCurrent and WaveWatch III reanalysis products. Globally, the locations of microplastic accumulation (accumulation zones) are largely determined by the Ekman currents. Simulations of the North Pacific and North Atlantic show that the locations of the modeled accumulation zones using GlobCurrent Total (Ekman+Geostrophic) currents generally agree with observed microplastic distributions in the North Pacific and with the zonal distribution in the North Atlantic. Geostrophic currents and Stokes drift do not contribute to large-scale microplastic accumulation in the subtropics, but Stokes drift leads to increased microplastic transport to Arctic regions. Since the WaveWatch III Stokes drift and GlobCurrent Ekman current data sets are not independent, combining Stokes drift with the other current components leads to an overestimation of Stokes drift effects and there is therefore a need for independent measurements of the different ocean circulation components. We investigate whether windage would be appropriate as a proxy for Stokes drift but find discrepancies in the modeled direction and magnitude. In the North Pacific, we find that microplastic tends to accumulate in regions of relatively low eddy kinetic energy, indicating low mesoscale eddy activity, but we do not see similar trends in the North Atlantic.
Duncan EM, Arrowsmith J, Bain C, et al., 2018, The true depth of the Mediterranean plastic problem: Extreme microplastic pollution on marine turtle nesting beaches in Cyprus, MARINE POLLUTION BULLETIN, Vol: 136, Pages: 334-340, ISSN: 0025-326X
Kontopoulos DG, van Sebille E, Lange M, et al., 2018, Phytoplankton thermal responses adapt in the absence of hard thermodynamic constraints
To better predict how populations and communities respond to climatic temperature variation, it is necessary to understand how the shape of the response of fitness-related traits to temperature evolves (the thermal performance curve). Currently, there is disagreement about the extent to which the evolution of thermal performance curves is constrained. One school of thought has argued for the prevalence of thermodynamic constraints through enzyme kinetics, whereas another argues that adaptation can - at least partly - overcome such constraints. To shed further light on this debate, we perform a phylogenetic meta-analysis of the thermal performance curve of growth rate of phytoplankton - a globally important functional group -, controlling for potential environmental effects. We find that thermodynamic constraints have a minor influence on the shape of the curve. In particular, we detect a very weak increase of the maximum curve height with the temperature at which the curve peaks, suggesting a weak "hotter-is-better" constraint. Also, instead of a constant thermal sensitivity of growth across species, as might be expected from strong constraints, we detect phylogenetic signal in this as well as all other curve parameters. Our results suggest that phytoplankton thermal performance curves adapt to thermal environments largely in the absence of hard thermodynamic constraints.
Hart-Davis MG, Backeberg BC, Halo I, et al., 2018, Assessing the accuracy of satellite derived ocean currents by comparing observed and virtual buoys in the Greater Agulhas Region, REMOTE SENSING OF ENVIRONMENT, Vol: 216, Pages: 735-746, ISSN: 0034-4257
Fraser C, Morrison AK, Hogg AM, et al., 2018, Antarctica's ecological isolation will be broken by storm-driven dispersal and warming, NATURE CLIMATE CHANGE, Vol: 8, Pages: 704-+, ISSN: 1758-678X
Rodriguez-Zarate CJ, Sandoval-Castillo J, van Sebille E, et al., 2018, Isolation by environment in the highly mobile olive ridley turtle (Lepidochelys olivacea) in the eastern Pacific, PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES, Vol: 285, ISSN: 0962-8452
Ardhuin F, Aksenov Y, Benetazzo A, et al., 2018, Measuring currents, ice drift, and waves from space: the Sea surface KInematics Multiscale monitoring (SKIM) concept, OCEAN SCIENCE, Vol: 14, Pages: 337-354, ISSN: 1812-0784
Phillips JS, Sen Gupta A, Senina I, et al., 2018, An individual-based model of skipjack tuna (Katsuwonus pelamis) movement in the tropical Pacific ocean, PROGRESS IN OCEANOGRAPHY, Vol: 164, Pages: 63-74, ISSN: 0079-6611
Smith TM, York PH, Broitman BR, et al., 2018, Rare long-distance dispersal of a marine angiosperm across the Pacific Ocean, GLOBAL ECOLOGY AND BIOGEOGRAPHY, Vol: 27, Pages: 487-496, ISSN: 1466-822X
Cetina-Heredia P, van Sebille E, Matear RJ, et al., 2018, Nitrate Sources, Supply, and Phytoplankton Growth in the Great Australian Bight: An Eulerian-Lagrangian Modeling Approach, JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, Vol: 123, Pages: 759-772, ISSN: 2169-9275
Bull CYS, Kiss AE, van Sebille E, et al., 2018, The Role of the New Zealand Plateau in the Tasman Sea Circulation and Separation of the East Australian Current, JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, Vol: 123, Pages: 1457-1470, ISSN: 2169-9275
Goddijn-Murphy L, Peters S, Van Sebille E, et al., 2018, Concept for a hyperspectral remote sensing algorithm for floating macro plastics, MARINE POLLUTION BULLETIN, Vol: 126, Pages: 255-262, ISSN: 0025-326X
van Sebille E, Griffies SM, Abernathey R, et al., 2018, Lagrangian ocean analysis: Fundamentals and practices, OCEAN MODELLING, Vol: 121, Pages: 49-75, ISSN: 1463-5003
Hennekam R, Zinke J, van Sebille E, et al., 2018, Cocos (Keeling) Corals Reveal 200 Years of Multidecadal Modulation of Southeast Indian Ocean Hydrology by Indonesian Throughflow, PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY, Vol: 33, Pages: 48-60, ISSN: 2572-4525
Bond T, Ferrandiz-Mas V, Felipe-Sotelo M, et al., 2018, The occurrence and degradation of aquatic plastic litter based on polymer physicochemical properties: A review, CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY, Vol: 48, Pages: 685-722, ISSN: 1064-3389
Brach L, Deixonne P, Bernard M-F, et al., 2018, Anticyclonic eddies increase accumulation of microplastic in the North Atlantic subtropical gyre, MARINE POLLUTION BULLETIN, Vol: 126, Pages: 191-196, ISSN: 0025-326X
McAdam R, van Sebille E, 2018, Surface Connectivity and Interocean Exchanges From Drifter-Based Transition Matrices, JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, Vol: 123, Pages: 514-532, ISSN: 2169-9275
Bull CYS, Kiss AE, Jourdain NC, et al., 2017, Wind Forced Variability in Eddy Formation, Eddy Shedding, and the Separation of the East Australian Current, JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, Vol: 122, Pages: 9980-9998, ISSN: 2169-9275
Lange M, van Sebille E, 2017, Parcels v0.9: prototyping a Lagrangian ocean analysis framework for the petascale age, GEOSCIENTIFIC MODEL DEVELOPMENT, Vol: 10, Pages: 4175-4186, ISSN: 1991-959X
Axelsson C, van Sebille E, 2017, Prevention through policy: Urban macroplastic leakages to the marine environment during extreme rainfall events, MARINE POLLUTION BULLETIN, Vol: 124, Pages: 211-227, ISSN: 0025-326X
Koelmans AA, Kooi M, Law KL, et al., 2017, All is not lost: deriving a top-down mass budget of plastic at sea, ENVIRONMENTAL RESEARCH LETTERS, Vol: 12, ISSN: 1748-9326
Kruger L, Ramos JA, Xavier JC, et al., 2017, Identification of candidate pelagic marine protected areas through a seabird seasonal-, multispecific- and extinction risk-based approach, ANIMAL CONSERVATION, Vol: 20, Pages: 409-424, ISSN: 1367-9430
Coleman MA, Cetina-Heredia P, Roughan M, et al., 2017, Anticipating changes to future connectivity within a network of marine protected areas, GLOBAL CHANGE BIOLOGY, Vol: 23, Pages: 3533-3542, ISSN: 1354-1013
Everett JD, van Sebille E, Taylor MD, et al., 2017, Dispersal of Eastern King Prawn larvae in a western boundary current: New insights from particle tracking, FISHERIES OCEANOGRAPHY, Vol: 26, Pages: 513-525, ISSN: 1054-6006
Lange M, van Sebille E, 2017, Parcels v0.9: prototyping a Lagrangian Ocean Analysis framework for the petascale age, Geoscientific Model Development Discussions, Pages: 1-20
Cozar A, Marti E, Duarte CM, et al., 2017, The Arctic Ocean as a dead end for floating plastics in the North Atlantic branch of the Thermohaline Circulation, SCIENCE ADVANCES, Vol: 3, ISSN: 2375-2548
Turney CSM, Fogwill CJ, Palmer JG, et al., 2017, Tropical forcing of increased Southern Ocean climate variability revealed by a 140-year subantarctic temperature reconstruction, CLIMATE OF THE PAST, Vol: 13, Pages: 231-248, ISSN: 1814-9324
Hardesty BD, Harari J, Isobe A, et al., 2017, Using Numerical Model Simulations to Improve the Understanding of Micro-plastic Distribution and Pathways in the Marine Environment, FRONTIERS IN MARINE SCIENCE, Vol: 4
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