Visit to the British Museum: The fossil fish collection March 24th, 1877     

Henry Woodward  William Davies 《Proceedings of the Geologists' Association. Geologists' Association》1877,5(3):106-108

  相似文献   

Ordinary meeting,April 2nd, 1875     

William Carruthers 《Proceedings of the Geologists' Association. Geologists' Association》1875,4(5):261

  相似文献   

On the Flora of the London Clay of Sheppey     

William Carruthers 《Proceedings of the Geologists' Association. Geologists' Association》1875,4(5):318-319

  相似文献   

Note on the Flora of the Gault with Description of a new Pine Cone     

William Carruthers 《Proceedings of the Geologists' Association. Geologists' Association》1875,4(5):278-281

  相似文献   

The toxicity of one-hour silver exposures to early-life stages of the surf Spisula solidissima (Dillwyn)     

George A. Zoto  William E. Robinson 《Marine environmental research》1985,16(1):61-75

Early life stages of Spisula solidissima (1-, 4-, 8- and 12-h post-fertilization) were exposed to various concentrations of silver in solution (0, 4, 8, 24, 44, 124 and 278 μg liter^?1) for 1 h. An additional group of 1-h post-fertilized eggs was treated with 0, 4, 11 and 24 μg liter^?1 silver continuously for 48h. Results indicate that younger embryos are more susceptible to Ag. Exposure of one-hour-old embryos to silver for only 1 h gives results similar to a continuous 48-h exposure to the same concentration of Ag. The calculated EC₅₀ for 48-h continuously exposed embryos was similar to the EC₅₀ for 1-h post-fertilized embryos that were exposed to silver for only 1 h.  相似文献   

Temporal variations of heavy metals in Mercenaria mercenaria     

Behrens  William J.; Duedall  Iver W. 《ICES Journal of Marine Science》1981,39(3):219-222

  相似文献   

Sea-floor observations in the tongue of the ocean,Bahamas: An Argo/SeaMARC survey     

William C. Schwab  Elazar Uchupi  Robert D. Ballard  Thomas K. Dettweiler 《Geo-Marine Letters》1989,9(3):171-178

SeaMARC side-scan sonographs and Argo video and photographic data suggest that the recent sedimentary environment of the floor of the Tongue of the Ocean is controlled by an interplay of turbidity current flow from the south, sediment spill-over from the carbonate platform to the east (windward side), and rock falls from the west carbonate escarpment (lee side). The spill-over forms a sandy sedimentary deposit that acts as a topographic obstruction to the turbidity current flow from the south. This obstruction is expressed by the westward migration of a northwest-southeast oriented turbidity-current-cut channel.  相似文献   

Robust estimation of the natural mortality rate in a completed tagging experiment with variable fishing intensity   总被引：4，自引：0，他引：4  

Hearn  William S.; Sandland  Ronald L.; Hampton  John 《ICES Journal of Marine Science》1987,43(2):107-117

  相似文献   

The Role of Zooplankton in Global Ecosystem Dynamics: Comparative Studies from the World Oceans     

Valdes  Luis; Harris  Roger; Ikeda  Tsutomu; McKinnell  Skip; Peterson  William T 《ICES Journal of Marine Science》2004,61(4):441-444

  相似文献   

Characterization of chromophoric dissolved organic matter (CDOM) in the Baltic Sea by excitation emission matrix fluorescence spectroscopy   总被引：11，自引：0，他引：11  

Piotr Kowalczuk  Joanna Sto&#x;-Egiert  William J. Cooper  Robert F. Whitehead  Michael J. Durako 《Marine Chemistry》2005,96(3-4):273-292

Chromophoric dissolved organic matter (CDOM) is the major light absorber in the Baltic Sea. In this study, excitation emission matrix (EEM) fluorescence spectra and UV–visible absorption spectra of CDOM are reported as a function of salinity. Samples from different locations and over different seasons were collected during four cruises in 2002 and 2003 in the Baltic Sea in both Pomeranian Bay and the Gulf of Gdansk. Absorption by CDOM decreased with increased distance from the riverine source and reached a relatively stable absorption background in the open sea. Regression analysis showed that fluorescence intensity was linearly related to absorption by CDOM at 375 nm and a_CDOM(375) absorption coefficients were inversely related to salinity. Analysis of CDOM-EEM spectra indicated that a change in composition of CDOM occurred along the salinity gradient in the Baltic Sea. Analysis of percent contribution of respective fluorophore groups to the total intensity of EEM spectra indicated that the fluorescence peaks associated with terrestrial humic components of the CDOM and total integrated fluorescence decreased with decreasing CDOM absorption. In contrast, the protein-like fraction of CDOM decreased to a lesser degree than the others. Analysis of the percent contribution of fluorescence peak intensities to the total fluorescence along the salinity gradient showed that the contribution of protein-like fluorophores increased from 2.6% to 5.1% in the high-salinity region of the transect. Fluorescence and absorption changes observed in the Baltic Sea were similar to those observed in similar transects that have been sampled elsewhere, e.g. in European estuaries, Gulf of Mexico, Mid-Atlantic Bight and the Cape Fear River plume in the South Atlantic Bight, although the changes in the Baltic Sea occurred over a much smaller salinity gradient.  相似文献