Free-Swimming Copepod Nauplii of Narragansett Bay with a Key to Their Identification

1966 ◽  
Vol 23 (2) ◽  
pp. 189-205 ◽  
Author(s):  
Daniel J. Faber
Keyword(s):  
Narragansett Bay ◽  
The West ◽  
Free Swimming ◽  
Surface Samples ◽  
Plankton Sampler

Zooplankton surface samples were taken with a number 12 silk bolting cloth net towed by a Clark-Bumpus quantitative plankton sampler in Narragansett Bay for 12 months. The samples were collected twice weekly, except during December, January, and February, at night at one position in the West Passage of Narragansett Bay. Ten calanoid, three cyclopoid, and one harpacticoid species of free-swimming copepod nauplii were collected from July 1957 through June 1958. The structure and arrangement of elements of the caudal armatures of these copepod nauplii showed certain differences which were utilized to develop a key.

Seasonal Occurrence and Abundance of Free-Swimming Copepod Nauplii in Narragansett Bay

1966 ◽  
Vol 23 (3) ◽  
pp. 415-422 ◽  
Author(s):  
Daniel J. Faber
Keyword(s):  
North America ◽  
Relative Abundance ◽  
East Coast ◽  
Narragansett Bay ◽  
Seasonal Abundance ◽  
Seasonal Occurrence ◽  
Individual Species ◽  
The West ◽  
Free Swimming ◽  
The Individual

Night, surface zooplankton samples at one position in the West Passage of Narragansett Bay yielded 10 calanoid, three cyclopoid, and one harpacticoid species of free-swimming copepod nauplii. The seasonal abundance of all species of nauplii combined during the 12 months of study showed significant peaks in spring and mid summer. The holoplankters were grouped into four seasonal categories: summer–fall, winter–spring, spring, and year-round; the meroplankters were put in another category. The first two groups dominated the collections. The seasonal occurrence and relative abundance of the individual species of nauplii is shown for the period of study. Included is a short synopsis of the geographical distribution of the adults along the east coast of North America as recorded in the literature.

Evaluation of the Extent of Contaminated Sediments in the West Branch of the Grand Calumet River, Indiana-Illinois, USA

1993 ◽  
Vol 28 (8-9) ◽  
pp. 53-58 ◽  
Author(s):  
R. A. Cahill ◽  
M. T. Unger
Keyword(s):  
Trace Elements ◽  
Organic Carbon ◽  
Sediment Cores ◽  
River Sediments ◽  
Organic Carbon Content ◽  
Sedimentation Rates ◽  
The West ◽  
Surface Samples ◽  
Rate Information ◽  
The Mean

The extent of contamination in river sediments is often not rigorously evaluated. In many cases, only surface sediment samples are taken. In other cases, entire sediment cores are composited for analysis, an approach that limits the ability to identify discrete zones of contamination. In addition, few studies include information on the rate of sedimentation. Composited sediment cores, subsamples of cores made at discrete intervals, and surface samples were obtained from locations in the West Branch of the Grand Calumet River. The organic carbon content and concentrations of up to 26 major, minor, and trace elements were determined. Sedimentation rates at the ten locations were estimated using 137Cs. The mean concentrations of metals in the surface samples were considerably higher than concentrations in samples obtained by the two coring approaches. Only by analyzing discrete subsamples was it possible to plot the concentrations by depth and location. This approach was used to demonstrate that high levels of organic carbon and trace elements are confined between river miles 5 and 7.5. Sedimentation rate information combined with chemical analyses of the same cores indicate that contamination of this part of the river began in the 1930s.

An acoustic survey of the sea floor south of Dorset and its geological interpretation

1961 ◽  
Vol 244 (712) ◽  
pp. 299-330 ◽  
Keyword(s):  
Upper Cretaceous ◽  
Supplementary Information ◽  
Acoustic Survey ◽  
The West ◽  
Free Swimming ◽  
Gravity Corer ◽  
Main Structure ◽  
Sea Floor ◽  
Geological Interpretation ◽  
Northern Limb

An area of sea floor from the Dorset coast southward to about 50° 30' N, and between 2° 2' and 2° 27' W has been surveyed in detail using asdic equipment for recording relief, and a gravity corer and free-swimming divers for obtaining samples. Neighbouring areas were examined in less detail. The asdic provides an acoustic picture of the sea floor, and enables outcrops and faults to be mapped. Supplementary information was obtained from Admiralty surveys. The submerged part of the Isle of Purbeck Anticline is shown to be an elongated dome with Corallian rocks exposed in its core at Lulworth Bank. The dome is intersected by many sub- parallel faults trending about 15° east of north. Except along the steep monoclinal northern limb dips are low, seldom more than 3° or 4°. Minor folds are superimposed on the main structure. In the east they lie nearly east and west, while in the west, where the Purbeck Anticline yields place to the Weymouth Anticline, a north-westerly trend is dominant. South of the Purbeck Anticline lies a broad and gentle syncline in Jurassic and Lower Cretaceous rocks which is named the Shambles Syncline. It is overlain unconformably by Upper Cretaceous rocks.

scholarly journals Analysis of surface and borehole samples from the West Greenland Basin

1973 ◽  
Vol 53 ◽  
pp. 33-37
Author(s):  
N.B.H Stevens
Keyword(s):  
Source Rock ◽  
Active Zone ◽  
Atomic Energy Commission ◽  
The West ◽  
Core Drilling ◽  
West Greenland ◽  
The Core ◽  
Surface Samples ◽  
Greenland Basin ◽  
Rock Analysis

During the summer of 1971 a programme of shallow core-drilling was undertaken on the Nûgssuaq peninsula using a Craelius Prosper 25 core drill belonging to the Danish Atomic Energy Commission, Risø. This drill provides cores with a diameter of 16 mm. The object of the programme was to obtain fresh samples of the Cretaceous-Tertiary shales in this part of the West Greenland Basin for stratigraphic and source rock analysis. Source rock analysis of surface samples collected during 1968 (see Stevens in Henderson, 1969) had indicated the desirability of obtaining fresher material than can be collected in the active zone or at the immediate top of the permafrost zone. For various reasons the coring programme did not provide the amount of cores hoped for. The core samples sent for analysis were therefore supplemented by surface samples (mainly from Nugssuaq). This report gives a brief account of the results of the analysis of 21 surface and borehole samples. The sample localities are shown in fig. 10.

A surface plankton sampler for the larval stages of the western rock lobster.

1975 ◽  
Vol 26 (2) ◽  
pp. 275 ◽  
Author(s):  
BF Phillips ◽  
DW Rimmer
Keyword(s):  
Western Australia ◽  
Surface Waters ◽  
West Coast ◽  
Rock Lobster ◽  
The West ◽  
Small Boat ◽  
Larval Stages ◽  
Plankton Sampler

A net capable of catching the larval stages, including the puerulus of Panulirus longipes* (MilneEdwards) in the surface plankton is described. The sampler has a square 0.25 m2 mouth, an overall filtering length of 140 cm and a 10 cm diameter PVC cod-end bucket. Towed from a short boom from the side of a small boat or from a longer boom out from the side of a larger vessel, the sampler has a bridle attached to two opposite corners and a weight at the bottom corner so that in operation it presents a relatively unobstructed diamond shaped opening to the water. A total of 112 puerulus stage larvae were caught with this sampler (fitted with a 2.5 mm mesh net) during five nights of sampling within the reef at Seven Mile Beach. The greatest number of larvae were found to be present in the surface plankton prior to midnight. Modified versions of this sampler with either 2.5 mm or 1.0 mm mesh net have been successfully used to sample puerulus and phyllosoma stages of western rock lobster larvae in the surface waters off the west coast of Western Australia.

scholarly journals Analyses of Two Ice Cores Drilled at the Ice-Sheet Margin in West Greenland

1988 ◽  
Vol 10 ◽  
pp. 23-27 ◽  
Author(s):  
H.B. Clausen ◽  
B. Stauffer
Keyword(s):  
Flow Line ◽  
Ice Core ◽  
Ice Sheet ◽  
Greenland Ice Sheet ◽  
Ice Cores ◽  
Temperature Profiles ◽  
Measured Temperature ◽  
The West ◽  
Surface Samples ◽  
Insight Into

In 1978 two ice cores were drilled to depths of 46 and 92 m respectively at Camp 3, at the west margin of the Greenland ice sheet. Both core drillings reached bedrock. In addition, surface samples were collected in the marginal area along an estimated flow line.The δl8O profiles of the two ice cores and of the surface samples show similar features. All three δ180 records reveal the characteristic shift (of 5–6 per mil for the Pleistocene-Holocene transition 11 000 years ago) observed in Greenland deep ice cores from Camp Century and Dye 3.The δ18O results, as well as the measured temperature profiles in the bore holes, are used to provide more insight into the rheology of the ice sheet. The analyses of marginal ice samples is an important supplement to deep ice-core analyses.

The Net Circulation in the West Passage of Narragansett Bay

1973 ◽  
Author(s):  
Robert H. Weisberg ◽  
III Sturges ◽  
Wilton
Keyword(s):  
Narragansett Bay ◽  
The West
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