Impact of sampling depth and plant species on local environmental conditions, microbiological parameters and bacterial composition in a mercury contaminated salt marsh     

Cleary DF  Oliveira V  Gomes NC  Pereira A  Henriques I  Marques B  Almeida A  Cunha A  Correia A  Lillebø AI 《Marine pollution bulletin》2012,64(2):263-271

We compare the environmental characteristics and bacterial communities associated with two rushes, Juncus maritimus and Bolboschoenus maritimus, and adjacent unvegetated habitat in a salt marsh subjected to historical mercury pollution. Mercury content was higher in vegetated than unvegetated habitat and increased with sampling depth. There was also a significant relationship between mercury concentration and bacterial composition. Habitat (Juncus, Bolboschoenus or unvegetated), sample depth, and the interaction between both, however, explained most of the variation in composition (~70%). Variation in composition with depth was most prominent for the unvegetated habitat, followed by Juncus, but more constrained for Bolboschoenus habitat. This constraint may be indicative of a strong plant-microbe ecophysiological adaptation. Vegetated habitat contained distinct bacterial communities associated with higher potential activity of aminopeptidase, β-glucosidase and arylsulphatase and incorporation rates of (14)C-glucose and (14)C-acetate. Communities in unvegetated habitat were, in contrast, associated with both higher pH and proportion of sulphate reducing bacteria.  相似文献   

Seasonal and spatial variation in lipid and triacylglycerol levels in juvenile chinook salmon (Oncorhynchus tshawytscha) from the Bridge River, British Columbia     

Jaclyn S. Cleary  Michael J. Bradford  David M. Janz 《Limnologica》2012,42(2):144-150

Triacylglycerols (TAGs) are the primary form of energy storage in fish, but little work has been done on the dynamics of TAG storage and use in relation to environmental conditions. We sampled age-0 chinook salmon (Oncorhynchus tshawytscha) in two reaches of a regulated river in British Columbia, Canada that had different discharge regimes. During the summer, fish from the reach with high freshet flows grew more slowly and had lower TAG levels than those from the reach with lower and more stable flows. In addition, smaller individuals had lower TAG levels than larger ones. We suggest that in the reach with higher flows fish were unable to obtain sufficient surplus energy for somatic growth and lipid storage. In the fall, when flows were lower, TAG storage increased and the proportion of total lipids that were TAGs were similar for both small and large fish. The allocation of energy to TAG stores was likely a strategy to ensure individuals had sufficient energy for overwintering. Our results suggest that individual-based variation in TAG levels may be sensitive to environmental factors and can be used as a measure of fish condition and performance, but more work is needed to fully understand lipid dynamics in seasonally and spatially variable rearing environments.  相似文献   

The seismicity of the Gunning and surrounding areas, 1958–1961     

J. R. Cleary 《Australian Journal of Earth Sciences》2013,60(1):23-29

Between October 1958 and August 1961, 98 tremors were located within 100 km. of Yass, New South Wales, of which 52 were in the vicinity of Gunning. Many of the epicentres appear to be closely associated with granite boundaries and with known faults in the area. The Gunning epicentres form two arms of a wedge, and activity oscillates between these arms. Temporary cessation of activity at Gunning is often accompanied by an increase in the frequency of events in the surrounding areas, which suggests that the wedge acts as a “safety valve” for the region.

Only one tremor was observed in the vicinity of Lake George. Fault plane analysis of the tremor gave a solution consistent with movement on a meridional high angle fault. It is inferred that recent movement on the Lake George Fault has been largely eliminated by the formation of the Gunning wedge.  相似文献   

First results from the Very Small Array – III. The cosmic microwave background power spectrum     

Paul F. Scott  Pedro Carreira  Kieran Cleary  Rod D. Davies  Richard J. Davis  Clive Dickinson  Keith Grainge  Carlos M. Gutiérrez  Michael P. Hobson  Michael E. Jones  Rüdiger Kneissl  Anthony Lasenby  Klaus Maisinger  Guy G. Pooley  Rafael Rebolo  José Alberto Rubiño-Martin †  Pedro J. Sosa Molina  Ben Rusholme ‡  Richard D. E. Saunders  Richard Savage  An&#;e Slosar  Angela C. Taylor  David Titterington  Elizabeth Waldram  Robert A. Watson §  Althea Wilkinson 《Monthly notices of the Royal Astronomical Society》2003,341(4):1076-1083

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Source subtraction for the extended Very Small Array and 33-GHz source count estimates   总被引：1，自引：0，他引：1  

Kieran A. Cleary †  Angela C. Taylor ‡  Elizabeth Waldram  Richard A. Battye  Clive Dickinson §  Rod D. Davies  Richard J. Davis  Ricardo Genova-Santos  Keith Grainge  Michael E. Jones ¶  Rüdiger Kneissl  G. G. Pooley  Rafael Rebolo  José Alberto Rubiño-Martín  Richard D. E. Saunders  Paul F. Scott  An&#;e Slosar &#;  David Titterington  Robert A. Watson 《Monthly notices of the Royal Astronomical Society》2005,360(1):340-353

We describe the source subtraction strategy and observations for the extended Very Small Array (VSA), a cosmic microwave background interferometer operating at 33 GHz. A total of 453 sources were monitored at 33 GHz using a dedicated source subtraction baseline. 131 sources brighter than 20 mJy were directly subtracted from the VSA visibility data. Some characteristics of the subtracted sources, such as spectra and variability, are discussed. The 33-GHz source counts are estimated from a sample selected at 15 GHz. The selection of VSA fields in order to avoid bright sources introduces a bias into the observed counts. This bias is corrected and the resulting source count is estimated to be complete in the flux-density range 20–114 mJy. The 33-GHz source counts are used to calculate a correction to the VSA power spectrum for sources below the subtraction limit.  相似文献   

P-Wave Scattering in the Earth's Crust and Upper Mantle     

J. R. Cleary  D. W. King  R. A. W. Haddon 《Geophysical Journal International》1975,43(3):861-872

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Seismic wave scattering on underside reflection at the core-mantle boundary     

J. Cleary 《Physics of the Earth and Planetary Interiors》1981,26(4):266-267

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Numerical simulation of unsteady fluid flow and propagation of a circular hydraulic fracture     

M. P. Cleary  S. K. Wong 《国际地质力学数值与分析法杂志》1985,9(1):1-14

A computational procedure is developed for solving the problem of a circular hydraulic fracture propagating under the action of frac-0fluid being pumped in at a central wellbore. The crack is modelled as continuous distributions of ring dislocations and the resulting elasticity singular integral equation is solved numerically. The fluid flow equations are approximated by local and global interpolation finite difference schemes. The coupling between elasticity and fluid flow is handled numerically, by, two different algorithms: one iterates on crack tip velocity whereas the other varies the time step size until it agrees with the chosen increment in crack length. Sample results are given; it is found that the velocity algorithm is computationally more, efficient and more stable. The model allows detailed tracing of pressure distribution and fluid flow in the fracture, even under complex conditions of cyclic injection and fluid rheology. It may serve as a stand-alone model of (horizontal) hydrafracs–especially at shallow depths–or it may be used as a reference frame to test the various numerical formulation/algorithms required for the ongoing development of a fully 3-D hydrafrac simulator.  相似文献   

Organotin and total tin in coastal waters of Southwest England     

J.J Cleary  A.R.D Stebbing 《Marine pollution bulletin》1985,16(9):350-355

Samples of seawater from sites along the southwest coast were collected during 1984 and analysed for total tin and organotin by flameless atomic absorption spectro-photometry. Organotin concentrations were below detection limits (0.10 μg l^?1 TBTO) at all marina sites, but higher concentrations were found in harbour waters, the highest value being 0.88 μg l^?1 TBTO at Plymouth (Sutton harbour). The fact that organotin levels may occasionally exceed some toxicological threshold concentrations suggests that biological water quality may sometimes be depressed.  相似文献   

Spitzer Space Telescope Infrared Spectrograph mapping of the central kpc of Centaurus A     

Alice C. Quillen  Joss Bland-Hawthorn  Joel D. Green  J. D. Smith  D. Amelia Prasad  Almudena Alonso-Herrero  Kieran Cleary  Mairi H. Brookes  Charles R. Lawrence 《Monthly notices of the Royal Astronomical Society》2008,384(4):1469-1482

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