Submarine slope mudstone facies,cozy dell formation (Middle Eocene), California     

Roger M. Slatt  Peter R. Thompson 《Geo-Marine Letters》1985,5(1):39-45

A 120 m thick section of the Cozy Dell Formation (middle Eocene), southem California, consists of a graylaminated mudstone and a tanungraded mudstone; sandstone beds are associated with the laminated mudstone. Sedimentary structures, stratification sequences, foraminiferal distributions, and composition indicate that the ungraded mudstone is an upper slope hemipelagic deposit, while the laminated mudstone is an overbank deposit associated with shallow channels or gullies in which the sandstone beds were deposited. This depositional setting may be analogous to that of the modern Mississippi River delta front.  相似文献   

Comparison between zooplankton data collected by the Continuous Plankton Recorder survey in the English Channel and by WP-2 nets at station L4, Plymouth (UK)     

Eurgain H. John  Sonia D. Batten  Roger P. Harris  Graeme C. Hays 《Journal of Sea Research》2001,46(3-4)

Zooplankton sampling has been carried out by the Continuous Plankton Recorder (CPR) survey since the 1930s enabling the study of long-term changes in plankton populations, the elucidation of seasonal patterns of abundance, and more recently providing zooplankton biomass estimates for ecosystem models. Data for zooplankton abundance collected by CPR tows in the Western English Channel (between 1988 and 1998) were compared to vertically integrated samples collected from station L4 off Plymouth, UK. Comparisons were made for locally abundant copepods (including Acartia, Calanus, Para/Pseudocalanus, Centropages, Oithona and Temora) collected by CPR and WP-2 nets. All dominant species recorded at L4 were also common to the CPR data. However, the position of the taxa in the two datasets was not equivalent. Seasonal cycles revealed by CPR data were significantly similar to those recorded throughout the water column at L4 for most taxa. However, absolute levels of abundance differed for the two datasets: abundances were underestimated by CPR samples when compared to those of vertically integrated samples by a factor of between 2 and 35, with the exception of Centropages. The differing mesh sizes (200 and 270 μm) of the WP-2 net and CPR mesh could only partially explain these differences in abundance, implying that the behaviour of individual taxa and their depth in the water column also influenced the abundance recorded.  相似文献   

Geomorphic evolution of the Tongue of the Ocean and the Providence Channels,Bahamas     

Roger LeB Hooke  Wolfgang Schlager 《Marine Geology》1980,35(4):343-366

During their early history the Tongue of the Ocean and the Providence Channels were broad, relatively shallow basins flanked by growing carbonate banks. As the Blake-Bahama platform subsided, sedimentation kept pace with subsidence on the banks, but not in these flat-bottomed troughs, thus increasing the relief. At the outer end of the troughs the Blake-Bahama escarpment, bounding the platform on the east, dropped steeply to the abyssal plain. Sediment gravity flows coursing down this escarpment began to erode a valley headward into the flat-bottom ancestral Northeast Providence Channel. As the relief between the banks and the troughs increased, the flows increased in vigor, and some of them were able to move down the troughs and into the headwardly eroding central valley. The rate of headward erosion thus increased, with the result that still more flows found their way into the valley. The head of this valley is now off central Andros Island, about 225 km from its point of origin, and headward erosion is continuing.Study of bathymetric charts, observations made during sixteen dives in the Tongue of the Ocean using the submersible DSRV “Alvin”, and analogies with subaerial geomorphic processes and their products contributed to the development of this model. The model is consistent with available stratigraphic information.It is emphasized that the morphology of the Tongue of the Ocean and the Providence Channels cannot be explained as the result of a single unidirectional process, such as upbuilding alone or erosion alone. Both have occurred and both are still occurring. Upbuilding predominated early in the history of the Bahamas; it is responsible for the high walls. Erosion began later and has been accelerating through time. It is responsible for the central valley.  相似文献   

A simple and precise analytical method for the determination of caesium-137 in sea water     

Roger  S.; Wilson  T. 《ICES Journal of Marine Science》1974,36(1):87-89

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An improved Ewing heat probe frame   总被引：3，自引：0，他引：3  

Tony F. Clark  Frank J. Malcolm  Ben J. Korgen 《Marine Geophysical Researches》1972,1(4):451-455

The standard Ewing heat probe frame has been improved through the design of a new takedown model whose parts are held together by lynch pins. When a 600 lb (272 kg) unit of this type is taken apart, the heaviest single piece of the dismantled unit weighs only 75 lb (34 kg).This makes it feasible for one person to handle, transport, and assemble the new unit. A central, main support member of a heat probe using this frame can be suspended over the side of a research vessel while the heavier temperature recorder and ballast weights are attached by means of the quickaction lynch pins. This makes it possible to use this device on relatively small vessels which are not designed for coring work, having a minimum of free deck space and without launching platforms or hydraulic A-frame booms.  相似文献   

Effects of crustacean traps on benthic fauna     

Eno  N. Clare; MacDonald  David S.; Kinnear  Jim A. M.; Amos  S. Chris; Chapman  Colin J.; Clark  Robin A.; Bunker  Francis St P.D.; Munro  Colin 《ICES Journal of Marine Science》2001,58(1):11-20

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Editorial     

Roger Searle  Ken MacDonald 《Marine Geophysical Researches》1987,9(1):v-v

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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

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Observations on the Burrows and Burrowing Behaviour of the Red Band-Fish, Cepola rubescens L.     

R. James A.  Atkinson Roger S. V.  Pullin 《Marine Ecology》1996,17(1-3):23-40

Abstract. The red band-fish, Cepola rubescens L., lives in burrows in sublittoral muddy sediments. The authors first presented information on the burrows of this species in the 1970s. The present paper presents new information on burrow structure, describes the method of excavation, and comments on the bioturbatory significance of the species. The work derives from field and laboratory studies. A burrow typically consists of a vertical shaft which opens into an expanded terminal chamber. In some cases a side shaft may be added. The paper includes a size analysis of 130 burrows measured in the field and detailed morphological information from a selection of burrows which were cast with polyester resin. The fish burrows are frequently intersected by the burrows of other species and interspecific associations may develop. Burrow size reflects the size of the occupant and may approach 1 m in depth. The biogenic movement of water and particles to this depth is often overlooked in bioturbation studies and is discussed. Burrow distribution is aggregate, which has implications for the bioturbatory impact of the species. Burrows are constructed by mouth excavation and this is described in detail. Fish transport fine material within their mouths and coarse material is grasped in the jaws. Large spoil heaps occur at burrow openings. One obvious effect of this bioturbatory activity at the field site was the redistribution of coarse material (shell gravel) from depth to the sediment surface.  相似文献   

Nutrient attenuation in a shallow,gravel-bed river. II. Spatial and temporal changes in nitrogen dynamics and community metabolism     

J. Christopher Rutherford  Roger G. Young  John M. Quinn  Robert J. Wilcock 《新西兰海洋与淡水研究杂志》2020,54(3):410-430

ABSTRACT

Instream processes alter the concentration and bioavailability of nutrients as they are transported downstream. By relating primary production and periphyton composition to changes in nutrient concentration in a gravel-bed river this study made inferences about recycling and attenuation. Where dissolved inorganic nitrogen (DIN) was abundant, concentrations decreased linearly with distance but by less than required to meet the nitrogen demand of primary production. Where DIN was barely measurable photosynthesis was reduced but only by 50%. We infer that recycling sustained primary production even when DIN concentrations were negligibly small. One implication is that DIN removal underestimates attenuation. Further experimental research on recycling and improved modelling is required to better quantify the length of streams adversely affected by nutrients.  相似文献