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Marine pollution bulletin 65건

  1. [해외논문]   Editorial Board   SCI SCIE


    Marine pollution bulletin v.114 no.2 ,pp. i - ii , 2017 , 0025-326x ,

    초록

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  2. [해외논문]   Seasonal variations and sources of sedimentary organic carbon in Tokyo Bay   SCI SCIE

    Kubo, A. ; Kanda, J.
    Marine pollution bulletin v.114 no.2 ,pp. 637 - 643 , 2017 , 0025-326x ,

    초록

    Total organic carbon (TOC), total nitrogen (TN) contents, their stable C and N isotope ratio (δ 13 C and δ 15 N), and chlorophyll a ([Chl a] sed ) of surface sediments were investigated monthly to identify the seasonal variations and sources of organic matter in Tokyo Bay. The sedimentary TOC (TOC sed ) and TN (TN sed ) contents, and the sedimentary δ 13 C and δ 15 N (δ 13 C sed and δ 15 N sed ) values were higher in summer than other seasons. The seasonal variations were controlled by high primary production in the water column and hypoxic water in the bottom water during summer. The fraction of terrestrial and marine derived organic matter was estimated by Bayesian mixing model using stable isotope data and TOC/TN ratio. Surface sediments in Tokyo Bay are dominated by marine derived organic matter, which accounts for about 69+/-5% of TOC sed .

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  3. [해외논문]   Nowhere safe? Exploring the influence of urbanization across mainland and insular seashores in continental Portugal and the Azorean Archipelago   SCI SCIE

    Bertocci, I. ; Arenas, F. ; Cacabelos, E. ; Martins, G.M. ; Seabra, M.I. ; Alvaro, N.V. ; Fernandes, J.N. ; Gaiao, R. ; Mamede, N. ; Mulas, M. ; Neto, A.I.
    Marine pollution bulletin v.114 no.2 ,pp. 644 - 655 , 2017 , 0025-326x ,

    초록

    Differences in the structure and functioning of intensively urbanized vs. less human-affected systems are reported, but such evidence is available for a much larger extent in terrestrial than in marine systems. We examined the hypotheses that (i) urbanization was associated to different patterns of variation of intertidal assemblages between urban and extra-urban environments; (ii) such patterns were consistent across mainland and insular systems, spatial scales from 10scm to 100skm, and a three months period. Several trends emerged: (i) a more homogeneous distribution of most algal groups in the urban compared to the extra-urban condition and the opposite pattern of most invertebrates; (ii) smaller/larger variances of most organisms where these were, respectively, less/more abundant; (iii) largest variability of most response variables at small scale; (iv) no facilitation of invasive species by urbanization and larger cover of canopy-forming algae in the insular extra-urban condition. Present findings confirm the acknowledged notion that future management strategies will require to include representative assemblages and their relevant scales of variation associated to urbanization gradients on both the mainland and the islands.

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  4. [해외논문]   Temporal dynamics of bacterioplankton communities in response to excessive nitrate loading in oligotrophic coastal water   SCI SCIE

    Dong, Z. ; Wang, K. ; Chen, X. ; Zhu, J. ; Hu, C. ; Zhang, D.
    Marine pollution bulletin v.114 no.2 ,pp. 656 - 663 , 2017 , 0025-326x ,

    초록

    Coastal ecosystems are receiving elevated loads of nitrogen (N) from anthropogenic sources. Understanding how excessive N loading affects bacterioplankton communities is critical to predict the biodiversity of marine ecosystems under conditions of eutrophic disturbance. In this study, oligotrophic coastal water microcosms were perturbed with nitrate in two loading modes: 1) one-off loading at the beginning of the incubation period; and 2) periodic loading every two days for 16days. Turnover in the bacterioplankton community was investigated by 16S rDNA gene amplicon sequencing. The alpha diversity of the bacterioplankton community showed great temporal variability and similar responses to the different treatments. Bacterioplankton community composition was influenced remarkably by time and N loading mode. The effects of N loading on bacterioplankton community structure showed obvious temporal variation, probably because of the great temporal variation in environmental parameters. This study provides insights into the effects of N pollution in anthropogenically perturbed marine environments.

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  5. [해외논문]   External nutrient loading from land, sea and atmosphere to all 656 Swedish coastal water bodies   SCI SCIE

    Bryhn, A.C. ; Dimberg, P.H. ; Bergstrom, L. ; Fredriksson, R.E. ; Mattila, J. ; Bergstrom, U.
    Marine pollution bulletin v.114 no.2 ,pp. 664 - 670 , 2017 , 0025-326x ,

    초록

    Identifying the main sources of nutrient loading is a key factor for efficient mitigation of eutrophication. This study has investigated the pathways of external nutrient loading to 656 coastal water bodies along the entire Swedish coastline. The studied water bodies have been delineated to meet requirements in the European Union's Water Framework Directive, and recent status assessments have shown that 57% of them fail to attain good or high ecological status with respect to nutrients. The analysis in the study was performed on data from mass-balance based nutrient budgets computed using the modelling framework Vattenwebb. The external nutrient contribution from the sea to the water bodies was highly variable, ranging from about 1% to nearly 100%, but the median contribution was >99% of the total external loading regarding both nitrogen and phosphorus. External loading from the atmosphere and local catchment area played a minor role in general. However, 45 coastal water bodies received >25% of the external nitrogen and phosphorus from their catchments. Loading from land typically peaked in April following ice-break and snow melting and was comparatively low during summer. The results indicate that for many eutrophicated Swedish coastal water bodies, nutrient abatement is likely to be optimally effective when potential measures in all of the catchment area of the concerned sea basin are considered. Local-scale mitigation in single water bodies will likely be locally effective only in the small proportion of areas where water and thereby also nutrient input from the catchment is high compared to the influx from the sea. Future studies should include nutrient reduction scenarios in order to refine these conclusions and to identify relevant spatial scales for coastal eutrophication mitigation measures from a water body perspective.

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  6. [해외논문]   Preventable fine sediment export from the Burdekin River catchment reduces coastal seagrass abundance and increases dugong mortality within the Townsville region of the Great Barrier Reef, Australia   SCI SCIE

    Wooldridge, S.A.
    Marine pollution bulletin v.114 no.2 ,pp. 671 - 678 , 2017 , 0025-326x ,

    초록

    The coastal seagrass meadows in the Townsville region of the Great Barrier Reef are crucial seagrass foraging habitat for endangered dugong populations. Deteriorating coastal water quality and in situ light levels reduce the extent of these meadows, particularly in years with significant terrestrial runoff from the nearby Burdekin River catchment. However, uncertainty surrounds the impact of variable seagrass abundance on dugong carrying capacity. Here, I demonstrate that a power-law relationship with exponent value of -1 (R 2 ~0.87) links mortality data with predicted changes in annual above ground seagrass biomass. This relationship indicates that the dugong carrying capacity of the region is tightly coupled to the biomass of seagrass available for metabolism. Thus, mortality rates increase precipitously following large flood events with a response lag of

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  7. [해외논문]   A bacterial community-based index to assess the ecological status of estuarine and coastal environments   SCI SCIE

    Aylagas, E. ; Borja, A. ; Tangherlini, M. ; Dell'Anno, A. ; Corinaldesi, C. ; Michell, C.T. ; Irigoien, X. ; Danovaro, R. ; Rodriguez-Ezpeleta, N.
    Marine pollution bulletin v.114 no.2 ,pp. 679 - 688 , 2017 , 0025-326x ,

    초록

    Biotic indices for monitoring marine ecosystems are mostly based on the analysis of benthic macroinvertebrate communities. Due to their high sensitivity to pollution and fast response to environmental changes, bacterial assemblages could complement the information provided by benthic metazoan communities as indicators of human-induced impacts, but so far, this biological component has not been well explored for this purpose. Here we performed 16S rRNA gene amplicon sequencing to analyze the bacterial assemblage composition of 51 estuarine and coastal stations characterized by different environmental conditions and human-derived pressures. Using the relative abundance of putative indicator bacterial taxa, we developed a biotic index that is significantly correlated with a sediment quality index calculated on the basis of organic and inorganic compound concentrations. This new index based on bacterial assemblage composition can be a sensitive tool for providing a fast environmental assessment and allow a more comprehensive integrative ecosystem approach for environmental management.

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  8. [해외논문]   The short-term effects of farmed fish food consumed by wild fish congregating outside the farms   SCI SCIE

    Gonzalez-Silvera, D. ; Guardiola, F.A. ; Cordero, H. ; Cuesta, A. ; Esteban, M.A. ; Martinez-Lopez, F.J. ; Lopez-Jimenez, J.A.
    Marine pollution bulletin v.114 no.2 ,pp. 689 - 698 , 2017 , 0025-326x ,

    초록

    We simulated in the laboratory the possible effects on fatty acids and immune status of wild fish arriving for the first time in the vicinity of a sea-cage fish farm, shifting their natural diet to commercial feed consumption, rich in fatty acids of vegetable origin. The flesh fatty acid profile of golden mullet specimens was altered after 2weeks of commercial feed consumption, showing an increase in fatty acids of vegetable origin. The serum peroxidase and bactericidal activities, and head-kidney leucocyte phagocytic capacity, increased after eight weeks of the new diet, while the respiratory burst activity decreased. The extent of these changes cannot be considered large enough to regard them as compromising the health status of fish. More research is needed in order to elucidate whether the rapid assimilation of the dietary fatty acids could harm the immune status of fish when feeding for longer periods than two months.

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  9. [해외논문]   Anthropogenic debris in the nests of kelp gulls in South Africa   SCI SCIE

    Witteveen, M. ; Brown, M. ; Ryan, P.G.
    Marine pollution bulletin v.114 no.2 ,pp. 699 - 704 , 2017 , 0025-326x ,

    초록

    Anthropogenic debris results in detrimental interactions with many marine species. Several seabirds include debris items in their nests, which can lead to entanglement of chicks and adults, resulting in injury or death. Anthropogenic debris was found in 4-67% of kelp gull Larus dominicanus nests in seven colonies in the Western Cape, South Africa. Nests contained two types of litter: items included in the nest structure during construction (mainly ropes and straps), and regurgitated items (mainly bags and food wrappers) that probably accumulate primarily during the chick-rearing period. Debris used in nest construction was more likely to injure gulls, and was found mainly at coastal sites where there was little natural vegetation for construction. Distance to the nearest urban waste landfill significantly affected the occurrence of debris items in nests, especially dietary-derived items. The amount of debris in kelp gull nests highlights the need for improved debris management in South Africa.

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  10. [해외논문]   Nutrient fluxes across sediment-water interface in Bohai Bay Coastal Zone, China   SCI SCIE

    Mu, D. ; Yuan, D. ; Feng, H. ; Xing, F. ; Teo, F.Y. ; Li, S.
    Marine pollution bulletin v.114 no.2 ,pp. 705 - 714 , 2017 , 0025-326x ,

    초록

    Sediment cores and overlying water samples were collected at four sites in Tianjin Coastal Zone, Bohai Bay, to investigate nutrient (N, P and Si) exchanges across the sediment-water interface. The exchange fluxes of each nutrient species were estimated based on the porewater profiles and laboratory incubation experiments. The results showed significant differences between the two methods, which implied that molecular diffusion alone was not the dominant process controlling nutrient exchanges at these sites. The impacts of redox conditions and bioturbation on the nutrient fluxes were confirmed by the laboratory incubation experiments. The results from this study showed that the nutrient fluxes measured directly from the incubation experiment were more reliable than that predicted from the porewater profiles. The possible impacts causing variations in the nutrient fluxes include sewage discharge and land reclamation.

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