Academic publications

Search or filter publications

Filter by type:

Filter by publication type

Filter by year:

to

Results

  • Showing results for:
  • Reset all filters

Search results

  • Journal article
    Dossena M, Yvon-Durocher G, Grey J, Montoya JM, Perkins DM, Trimmer M, Woodward Get al., 2012,

    Warming alters community size structure and ecosystem functioning

    , Proceedings of the Royal Society B: Biological Sciences, Vol: 279, Pages: 3011-3019, ISSN: 0962-8452

    <jats:p>Global warming can affect all levels of biological complexity, though we currently understand least about its potential impact on communities and ecosystems. At the ecosystem level, warming has the capacity to alter the structure of communities and the rates of key ecosystem processes they mediate. Here we assessed the effects of a 4°C rise in temperature on the size structure and taxonomic composition of benthic communities in aquatic mesocosms, and the rates of detrital decomposition they mediated. Warming had no effect on biodiversity, but altered community size structure in two ways. In spring, warmer systems exhibited steeper size spectra driven by declines in total community biomass and the proportion of large organisms. By contrast, in autumn, warmer systems had shallower size spectra driven by elevated total community biomass and a greater proportion of large organisms. Community-level shifts were mirrored by changes in decomposition rates. Temperature-corrected microbial and macrofaunal decomposition rates reflected the shifts in community structure and were strongly correlated with biomass across mesocosms. Our study demonstrates that the 4°C rise in temperature expected by the end of the century has the potential to alter the structure and functioning of aquatic ecosystems profoundly, as well as the intimate linkages between these levels of ecological organization.</jats:p>
  • Journal article
    Pross J, Contreras L, Bijl PK, Greenwood DR, Bohaty SM, Schouten S, Bendle JA, Roehl U, Tauxe L, Raine JI, Huck CE, van de Flierdt T, Jamieson SSR, Stickley CE, van de Schootbrugge B, Escutia C, Brinkhuis H, Dotti CE, Klaus A, Fehr A, Williams T, Bendle JAP, Carr SA, Dunbar RB, Gonzalez JJ, Hayden TG, Iwai M, Jimenez-Espejo FJ, Katsuki K, Kong GS, McKay RM, Nakai M, Olney MP, Passchier S, Pekar SF, Pross J, Riesselman CR, Rohl U, Sakai T, Shrivastava PK, Stickley CE, Sugisaki S, Tauxe L, Tuo S, van de Flierdt T, Welsh K, Yamane Met al., 2012,

    Persistent near-tropical warmth on the Antarctic continent during the early Eocene epoch

    , NATURE, Vol: 488, Pages: 73-77, ISSN: 0028-0836
  • Journal article
    Tscharntke T, Tylianakis JM, Rand TA, Didham RK, Fahrig L, Peter B, Bengtsson J, Clough Y, Crist TO, Dormann CF, Ewers RM, Fruend J, Holt RD, Holzschuh A, Klein AM, Kleijn D, Kremen C, Landis DA, Laurance W, Lindenmayer D, Scherber C, Sodhi N, Steffan-Dewenter I, Thies C, van der Putten WH, Westphal Cet al., 2012,

    Landscape moderation of biodiversity patterns and processes - eight hypotheses

    , BIOLOGICAL REVIEWS, Vol: 87, Pages: 661-685, ISSN: 1464-7931
  • Journal article
    Skea J, 2012,

    Research and evidence needs for decarbonisation in the built environment: a UK case study

    , BUILDING RESEARCH AND INFORMATION, Vol: 40, Pages: 432-445, ISSN: 0961-3218
  • Journal article
    Chon HS, Ohandja D-G, Voulvoulis N, 2012,

    The role of sediments as a source of metals in river catchments.

    , Chemosphere, Vol: 88, Pages: 1250-1256

    Aquatic sediments are a known source of pollutants, but their impact on the quality of overlying waters is not easily quantified. Sediments are generally considered to behave as a sink for pollutants such as heavy metals in the aquatic environment, frequently acting as a source for their presence in waters, with implications for catchment management. This study aimed to calculate the contribution of sediments to metal levels in overlying waters, helping understand their role as a source of metals in river catchments. An aquivalence mass balance approach was modified to take into account both natural and anthropogenic influences and applied to assess sediment contribution in a reach of the River Yare in the UK. The rates of total metal transport from sediments to overlying waters were estimated to be 29.89gd(-1) for cadmium (Cd), 1633.39gd(-1) for lead (Pb), 8.29gd(-1) for mercury (Hg) and 357.56gd(-1) for nickel (Ni). The results from the case study demonstrated that sediments could be a significant source of metal emissions in river catchments. The calculations proposed in the paper could be useful in developing strategies for sediment management, not only to improve and/or maintain quality of sediments but also to inform the selection of measures of pollution control for the catchment.
  • Journal article
    Parham PE, Pople D, Christiansen-Jucht C, Lindsay S, Hinsley W, Michael Eet al., 2012,

    Modelling the Role of Environmental Variables on the Population Dynamics of the Malaria Vector Anopheles gambiae sensu stricto

    , Malaria Journal, Vol: 11: 271
  • Journal article
    Rodríguez J-P, McIntyre N, Díaz-Granados2 M, Maksimovic Cet al., 2012,

    A database and model to support proactive management of sediment-related sewer blockages

    Due to increasing customer and political pressures, and more stringent environmental regulations, sediment and other blockage issues are now a high priority when assessing sewer system operational performance. Blockages caused by sediment deposits reduce sewer system reliability and demand remedial action at considerable operational cost. Consequently, procedures are required for identifying which parts of the sewer system are in most need of proactive removal of sediments. This paper presents an exceptionally long (7.5 years) and spatially detailed (9,658 grid squares – 0.03 km2 each – covering a population of nearly 7.5 million) data set obtained from a customer complaints database in Bogotá (Colombia). The sediment-related blockage data are modelled using homogeneous and non-homogeneous Poisson process models. In most of the analysed areas the inter-arrival time between blockages can be represented by the homogeneous process, but there are a considerable number of areas (up to 34%) for which there is strong evidence of non-stationarity. In most of these cases, the mean blockage rate increases over time, signifying a continual deterioration of the system despite repairs, this being particularly marked for pipe and gully pot related blockages. The physical properties of the system (mean pipe slope, diameter and pipe length) have a clear but weak influence on observed blockage rates. The Bogotá case study illustrates the potential value of customer complaints databases and formal analysis frameworks for proactive sewerage maintenance scheduling in large cities.
  • Journal article
    Green RJ, 2012,

    How Denmark Manages its Wind Power

    , IAEE Energy Forum, Vol: 21, Pages: 9-11
  • Journal article
    Yvon-Durocher G, Caffrey JM, Cescatti A, Dossena M, del Giorgio P, Gasol JM, Montoya JM, Pumpanen J, Staehr PA, Trimmer M, Woodward G, Allen APet al., 2012,

    Reconciling the temperature dependence of respiration across timescales and ecosystem types.

    , Nature, Vol: 487, Pages: 472-476

    Ecosystem respiration is the biotic conversion of organic carbon to carbon dioxide by all of the organisms in an ecosystem, including both consumers and primary producers. Respiration exhibits an exponential temperature dependence at the subcellular and individual levels, but at the ecosystem level respiration can be modified by many variables including community abundance and biomass, which vary substantially among ecosystems. Despite its importance for predicting the responses of the biosphere to climate change, it is as yet unknown whether the temperature dependence of ecosystem respiration varies systematically between aquatic and terrestrial environments. Here we use the largest database of respiratory measurements yet compiled to show that the sensitivity of ecosystem respiration to seasonal changes in temperature is remarkably similar for diverse environments encompassing lakes, rivers, estuaries, the open ocean and forested and non-forested terrestrial ecosystems, with an average activation energy similar to that of the respiratory complex (approximately 0.65 electronvolts (eV)). By contrast, annual ecosystem respiration shows a substantially greater temperature dependence across aquatic (approximately 0.65 eV) versus terrestrial ecosystems (approximately 0.32 eV) that span broad geographic gradients in temperature. Using a model derived from metabolic theory, these findings can be reconciled by similarities in the biochemical kinetics of metabolism at the subcellular level, and fundamental differences in the importance of other variables besides temperature—such as primary productivity and allochthonous carbon inputs—on the structure of aquatic and terrestrial biota at the community level.
  • Journal article
    Gong W, Faist MA, Ekins-Daukes NJ, Xu Z, Bradley DDC, Nelson J, Kirchartz Tet al., 2012,

    Influence of energetic disorder on electroluminescence emission in polymer:fullerene solar cells

    , PHYSICAL REVIEW B, Vol: 86, ISSN: 1098-0121
  • Journal article
    Wearn OR, Reuman DC, Ewers RM, 2012,

    Extinction Debt and Windows of Conservation Opportunity in the Brazilian Amazon

    , SCIENCE, Vol: 337, Pages: 228-232, ISSN: 0036-8075
  • Conference paper
    McIntyre N, Ballard C, Bulygina N, Carroll Z, Cluckie I, Dangerfield S, Ewen J, Geris J, Henshaw A, Jackson B, Marshall M, Pagella T, Park JS, Reynolds B, O’Connell E, O’Donnell G, Sinclair F, Solloway I, Thorne C, Wheater Het al., 2012,

    The potential for reducing flood risk through changes to rural land management: outcomes from the Flood Risk Management Research Consortium
  • Conference paper
    Almeida S, Bulygina N, McIntyre N, Wagener T, Buytaert Wet al., 2012,

    Predicting flows in ungauged catchments using correlated information sources

    , BHS International Hydrology Symposium
  • Conference paper
    Bakopoulou C, Bulygina N, Butler A, McIntyre Net al., 2012,

    Sensitivity Analysis and Parameter Identifiability of the Land Surface Model JULES at the point scale in permeable catchments
  • Journal article
    Llovell F, Marcos RM, MacDowell N, Vega LFet al., 2012,

    Modeling the Absorption of Weak Electrolytes and Acid Gases with Ionic Liquids Using the Soft-SAFT Approach

    , JOURNAL OF PHYSICAL CHEMISTRY B, Vol: 116, Pages: 7709-7718, ISSN: 1520-6106
  • Journal article
    Sommer J, Pausch J, Brundrett MC, Dixon KW, Bidartondo MI, Gebauer Get al., 2012,

    Limited carbon and mineral nutrient gain from mycorrhizal fungi by adult Australian orchids.

    , American Journal of Botany

    • Premise of the study: In addition to autotrophic and fully mycoheterotrophic representatives, the orchid family comprises species that at maturity obtain C and N partially from fungal sources. These partial mycoheterotrophs are often associated with fungi that simultaneously form ectomycorrhizas with trees. This study investigates mycorrhizal nutrition for orchids from the southwestern Australian biodiversity hotspot.• Methods: The mycorrhizal fungi of 35 green and one achlorophyllous orchid species were analyzed using molecular methods. Nutritional mode was identified for 27 species by C and N isotope abundance analysis in comparison to non-orchids from the same habitat. As a complementary approach, (13)CO(2) pulse labeling was applied to a subset of six orchid species to measure photosynthetic capacity.• Key results: Almost all orchids associated with rhizoctonia-forming fungi. Due to much higher than expected variation within the co-occurring nonorchid reference plants, the stable isotope approach proved challenging for assigning most orchids to a specialized nutritional mode; therefore, these orchids were classified as autotrophic at maturity. The (13)CO(2) pulse labeling confirmed full autotrophy for six selected species. Nonetheless, at least three orchid species (Gastrodia lacista, Prasophyllum elatum, Corybas recurvus) were identified as nutritionally distinctive from autotrophic orchids and reference plants.• Conclusions: Despite the orchid-rich flora in southwestern Australia, partial mycoheterotrophy among these orchids is less common than in other parts of the world, most likely because most associate with saprotrophic fungi rather than ectomycorrhizal fungi.
  • Journal article
    Murray SJ, Foster PN, Prentice IC, 2012,

    Future global water resources with respect to climate change and water withdrawals as estimated by a dynamic global vegetation model

    , JOURNAL OF HYDROLOGY, Vol: 448, Pages: 14-29, ISSN: 0022-1694
  • Journal article
    Simpson IR, Blackburn M, Haigh JD, 2012,

    A Mechanism for the Effect of Tropospheric Jet Structure on the Annular Mode-Like Response to Stratospheric Forcing

    , JOURNAL OF THE ATMOSPHERIC SCIENCES, Vol: 69, Pages: 2152-2170, ISSN: 0022-4928
  • Journal article
    Hoskins B, Fonseca R, Blackburn M, Jung Tet al., 2012,

    Relaxing the Tropics to an observed' state: analysis using a simple baroclinic model

    , QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY, Vol: 138, Pages: 1618-1626, ISSN: 0035-9009
  • Journal article
    Masato G, Hoskins BJ, Woollings TJ, 2012,

    Wave-breaking characteristics of midlatitude blocking

    , QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY, Vol: 138, Pages: 1285-1296, ISSN: 0035-9009
  • Journal article
    Sivakumar A, Pinjari A, 2012,

    Recent advances in activity and travel pattern modelling

    , TRANSPORTATION, Vol: 39, Pages: 749-754, ISSN: 0049-4488
  • Journal article
    THOMPSON RM, DUNNE JA, WOODWARD GUY, 2012,

    Freshwater food webs: towards a more fundamental understanding of biodiversity and community dynamics

    , Freshwater Biology, Vol: 57, Pages: 1329-1341, ISSN: 0046-5070
  • Journal article
    Kirchofer A, Brandt AR, Krevor S, Prigiobbe V, Wilcox Jet al., 2012,

    Impact of alkalinity sources on the life-cycle efficiency of mineral carbonation technologies

    , Energy and Environmental Science
  • Journal article
    Tauxe L, Stickley CE, Sugisaki S, Bijl PK, Bohaty SM, Brinkhuis H, Escutia C, Flores JA, Houben AJP, Iwai M, Jimenez-Espejo FJ, McKay R, Passchier S, Pross J, Riesselman CR, Roehl U, Sangiorgi F, Welsh K, Klaus A, Fehr A, Bendle JAP, Dunbar R, Gonzalez J, Hayden T, Katsuki K, Olney MP, Pekar SF, Shrivastava PK, van de Flierdt T, Williams T, Yamane Met al., 2012,

    Chronostratigraphic framework for the IODP Expedition 318 cores from the Wilkes Land Margin: Constraints for paleoceanographic reconstruction

    , PALEOCEANOGRAPHY, Vol: 27, ISSN: 0883-8305
  • Journal article
    Yoshida M, Ekins-Daukes NJ, Farrell DJ, Phillips CCet al., 2012,

    Photon ratchet intermediate band solar cells

    , Applied Physics Letters, Vol: 100, ISSN: 1077-3118

    In this paper, we propose an innovative concept for solar power conversion—the “photon ratchet” intermediate band solar cell (IBSC)—which may increase the photovoltaicenergy conversion efficiency of IBSCs by increasing the lifetime of charge carriers in the intermediate state. The limiting efficiency calculation for this concept shows that the efficiency can be increased by introducing a fast thermal transition of carriers into a non-emissive state. At 1 sun, the introduction of a “ratchet band” results in an increase of efficiency from 46.8% to 48.5%, due to suppression of entropy generation.
  • Journal article
    Irvine EA, Hoskins BJ, Shine KP, 2012,

    The dependence of contrail formation on the weather pattern and altitude in the North Atlantic

    , GEOPHYSICAL RESEARCH LETTERS, Vol: 39, ISSN: 0094-8276
  • Journal article
    Cotter CJ, Holm DD, 2012,

    On Noether's Theorem for the Euler-Poincaré equation on the diffeomorphism group with advected quantities

    , Foundations of Computational Mathematics, ISSN: 1615-3375
  • Journal article
    Chan N, Young T, Brindley H, Ekins-Daukes N, Araki K, Kemmoku Y, Yamaguchi Met al., 2012,

    Validation of energy prediction method for a concentrator photovoltaic module in Toyohashi Japan

    , Progress in Photovoltaics, Pages: n/a-n/a

    III–V concentrator photovoltaic systems attain high efficiency through the use of series connected multi-junction solar cells. As these solar cells absorb over distinct bands over the solar spectrum, they have a more complex response to real illumination conditions than conventional silicon solar cells. Estimates for annual energy yield made assuming fixed reference spectra can vary by up to 15% depending on the assumptions made. Using a detailed computer simulation, the behaviour of a 20-cell InGaP/In0.01GaAs/Ge multi-junction concentrator system was simulated in 5-min intervals over an entire year, accounting for changes in direct normal irradiance, humidity, temperature and aerosol optical depth. The simulation was compared with concentrator system monitoring data taken over the same period and excellent agreement (within 2%) in the annual energy yield was obtained. Air mass, aerosol optical depth and precipitable water have been identified as atmospheric parameters with the largest impact on system efficiency.
  • Journal article
    Woodward G, Gessner MO, Giller PS, Gulis V, Hladyz S, Lecerf A, Malmqvist B, McKie BG, Tiegs SD, Cariss H, Dobson M, Elosegi A, Ferreira V, Graça MAS, Fleituch T, Lacoursière JO, Nistorescu M, Pozo J, Risnoveanu G, Schindler M, Vadineanu A, Vought LB-M, Chauvet Eet al., 2012,

    Continental-scale effects of nutrient pollution on stream ecosystem functioning.

    , Science, Vol: 336, Pages: 1438-1440

    Excessive nutrient loading is a major threat to aquatic ecosystems worldwide that leads to profound changes in aquatic biodiversity and biogeochemical processes. Systematic quantitative assessment of functional ecosystem measures for river networks is, however, lacking, especially at continental scales. Here, we narrow this gap by means of a pan-European field experiment on a fundamental ecosystem process--leaf-litter breakdown--in 100 streams across a greater than 1000-fold nutrient gradient. Dramatically slowed breakdown at both extremes of the gradient indicated strong nutrient limitation in unaffected systems, potential for strong stimulation in moderately altered systems, and inhibition in highly polluted streams. This large-scale response pattern emphasizes the need to complement established structural approaches (such as water chemistry, hydrogeomorphology, and biological diversity metrics) with functional measures (such as litter-breakdown rate, whole-system metabolism, and nutrient spiraling) for assessing ecosystem health.
  • Journal article
    Beven K, Buytaert W, Smith LA, 2012,

    On virtual observatories and modelled realities (or why discharge must be treated as a virtual variable)

    , HYDROLOGICAL PROCESSES, Vol: 26, Pages: 1906-1909, ISSN: 0885-6087

This data is extracted from the Web of Science and reproduced under a licence from Thomson Reuters. You may not copy or re-distribute this data in whole or in part without the written consent of the Science business of Thomson Reuters.

Request URL: http://www.imperial.ac.uk:80/respub/WEB-INF/jsp/search-t4-html.jsp Request URI: /respub/WEB-INF/jsp/search-t4-html.jsp Query String: id=278&limit=30&page=48&respub-action=search.html Current Millis: 1695500585002 Current Time: Sat Sep 23 21:23:05 BST 2023