scholarly journals La mer de Goldthwait au Québec

2010 ◽  
Vol 31 (1-2) ◽  
pp. 61-80 ◽  
Author(s):  
Jean-Claude Dionne
Keyword(s):  
Quebec City ◽  
The South ◽  
Lawrence Estuary ◽  
Marine Invasion ◽  
North Shore ◽  
The North ◽  
Upper Limit ◽  
South Shore ◽  
Anticosti Island ◽  
St Lawrence Estuary

The Goldthwait Sea is defined as the late- and post-Glacial marine invasion in the St. Lawrence Estuary and Gulf east of Québec City. In Québec, this sea has submerged an area of about 25 000 km2. The largest areas submerged are the north shore of the St. Lawrence between Les Escoumins and Blanc-Sablon, the south shore between Levis and Tourelles, and the Anticosti Island. The upper limit of the Goldthwait Sea varies from place to place. The Goldthwait Sea began 14 000 years ago and land emergence is still in progress, since the pre-Wisconsin marine level has not been recovered yet. For a better chronology, this long interval needs to be subdivided. Three main periods have been recognized: Goldthwaitian I, II and III. However, a geographical subdivision is also needed. Numerous shorelines were observed at various elevations throughout the area formely submerged by the Goldthwait Sea. However, only a few shorelines are well developed and extensive, and correlations between former shorelines are difficult to establish. Only three levels are widespead and common to the Estuary and parts of the Gulf. The isostatic recovery has been rapid during the first three thousand years after déglaciation of the area: about 75%.

Les erratiques de dolomie à Rivière-Blanche, côte sud de l'estuaire maritime du Saint-Laurent : un indicateur de transport glaciaire et glaciel

2002 ◽  
Vol 39 (8) ◽  
pp. 1239-1255 ◽  
Author(s):  
Jean-Claude Dionne
Keyword(s):  
Sedimentary Basin ◽  
Granite Gneiss ◽  
Canadian Shield ◽  
Ice Flow ◽  
Lawrence Estuary ◽  
North Shore ◽  
The North ◽  
South Shore ◽  
St Lawrence Estuary ◽  
Northwestern Area

At Rivière-Blanche, a locality on the south shore of the lower St. Lawrence estuary, the clayey and rocky shore zone is largely covered by stones of various sizes and lithologies, from local and far-distant sources. A survey exceeding 31 000 boulders indicates that 31% are Precambrian clasts (granite, gneiss, anorthosite, etc.) from the Canadian Shield located on the north shore of the St. Lawrence, 40 km from Rivière-Blanche, and 69% are Appalachian lithologies, mainly (45%) sandstone and graywacke. There are also 1.5% of dolostone erratics, a lithology not widespread in the Canadian Shield nor in the Appalachians. Of the 1242 clasts of the various varieties of dolostone erratics observed, the grey coral (Cladopora) dolostone erratics are restricted to the Rivière-Blanche area, whereas many other varieties are common to both shores of the St. Lawrence estuary. The most likely far-distance source is the Proterozoic Mistassini sedimentary basin, while a few varieties such as the coral dolostone erratics are from the Appalachian Siluro-Devonian formations, of which the nearest outcrops are located in the northwestern area of Lake Matapedia, 25–30 km south of Rivière-Blanche. Whatever their source, the dolostone erratics were first transported by a late Wisconsinian regional ice stream before being released by icebergs in the Goldthwait Sea. The coral dolostone (Clapodora) erratics provide additional evidence for a northward ice flow between Lake Matapedia and Rivière-Blanche during an early phase of deglaciation of the St. Lawrence Valley after the formation of an Appalachian ice divide located approximately at the latitude of Lac-au-Saumon.

scholarly journals Do Barrow's Goldeneyes, Bucephala islandica, Breed South of the St. Lawrence Estuary in the Gaspé Peninsula, Eastern Canada?

2010 ◽  
Vol 124 (2) ◽  
pp. 179
Author(s):  
Jean-François Ouellet ◽  
Pierre Fradette ◽  
Isabel Blouin
Keyword(s):  
North America ◽  
Breeding Season ◽  
Breeding Habitat ◽  
Eastern North America ◽  
Eastern Canada ◽  
Lawrence Estuary ◽  
North Shore ◽  
The North ◽  
Bucephala Islandica ◽  
St Lawrence Estuary

We report the first observations of Barrow's Goldeneyes south of the St. Lawrence estuary in typical breeding habitat during the breeding season. Until recently, the confirmed breeding locations for the species in Eastern North America were all located on the north shore of the Estuary and Gulf of St. Lawrence.

Preliminary interpretation of the first refraction arrivals in Gaspé from shots in Labrador and Quebec

1969 ◽  
Vol 6 (4) ◽  
pp. 771-774 ◽  
Author(s):  
Douglas S. Rankin ◽  
Ravi Ravindra ◽  
David Zwicker
Keyword(s):  
Upper Mantle ◽  
Arrival Time ◽  
The South ◽  
North Shore ◽  
The North ◽  
A Value ◽  
South Shore ◽  
Compressional Velocity ◽  
St Lawrence River

Previous work in the Gulf of St. Lawrence has yielded an unusually high upper-mantle compressional velocity. In the Gaspé area a more recent determination has yielded a value of 8.75 ± 0.20 km/s for an unreversed profile. The arrival time at a station on the north shore of the St. Lawrence River suggests that there is no major difference in velocity and depth relative to the south shore.

The structure of psoluthurin A, the major triterpene glycoside of the sea cucumber Psolusfabricii

1983 ◽  
Vol 61 (7) ◽  
pp. 1465-1471 ◽  
Author(s):  
François-Xavier Garneau ◽  
Jean-Luc Simard ◽  
Odette Harvey ◽  
John W. Apsimon ◽  
Michel Girard
Keyword(s):  
Triterpene Glycoside ◽  
Sea Cucumber ◽  
Chemical Data ◽  
Lawrence Estuary ◽  
North Shore ◽  
The North ◽  
Extraction And Purification ◽  
Physico Chemical ◽  
St Lawrence Estuary

The isolation of the major triterpene glycoside from the sea cucumber Psolusfabricii obtained from the north shore of the St. Lawrence estuary is described. Versatile extraction and purification procedures were used and physico-chemical data is presented in support of structure 1 for psoluthurin A.

The General Oceanography of the Strait of Belle Isle

1954 ◽  
Vol 11 (3) ◽  
pp. 198-260 ◽  
Author(s):  
A. G. Huntsman ◽  
W. B. Bailey ◽  
H. B. Hachey
Keyword(s):  
Shallow Water ◽  
The South ◽  
Hydrographic Data ◽  
Arctic Water ◽  
Tidal Period ◽  
North Shore ◽  
The North ◽  
Labrador Current ◽  
South Shore ◽  
North And South

Hydrographic data for late August, 1923, show for the Strait (a) progressive inward movement on the north side of Arctic or sub-Arctic water, (b) progressive outward movement on the south side of Gulf water and (c) a dominant outward flow with evidence of a previous dominant inward flow. Time differences suggest tidal causes for the marked temperature and salinity changes. Current measurements for a double tidal period indicate residual trends of nine and eight miles per day in opposite directions on the north and south sides of the Strait. Inside, the Esquiman Channel shows two contra-clockwise eddies north and south of the Mekattina Bank. In addition, hydrographic data show a strong northeasterly movement along the Newfoundland shore and a weaker southwesterly one along the opposite Quebec shore.Planktonic animals indicate the water movements, Mertensia, Acartia spiniremis, Themisto, Pseudalibrotus and Oikopleura vanhöffeni surviving to various degrees in the water from the Labrador Current that reaches the centre of the Gulf along the north shore of the Strait and Channel. Other forms characterize the warm shallow water along the Newfoundland shore inside the Strait and show its movement outward to the east coast of Newfoundland. The Greenland seal fishery of winter reflects the inward movement from the Labrador Current. Cod and herring fisheries invade this cool water of the north shore only locally in summer with access of warmer water from the south shore. Lobsters and cunners are very abundant in, but particularly confined to, the warm shallow water mentioned above.

Occurrence and general behavior of balaenopterid cetaceans summering in the St. Lawrence Estuary, Canada

1987 ◽  
Vol 65 (6) ◽  
pp. 1363-1376 ◽  
Author(s):  
Peggy L. Edds ◽  
J. Andrew F. Macfarlane
Keyword(s):  
Abundant Species ◽  
Humpback Whales ◽  
Lawrence Estuary ◽  
The Past ◽  
North Shore ◽  
The North ◽  
Minke Whales ◽  
Field Season ◽  
St Lawrence Estuary ◽  
Blue Whales

Baleen whale movements were monitored from a hillside on the north shore of the St. Lawrence Estuary from 28 June to 27 September 1979. No diurnal or tidal relationships were apparent for the two most abundant species, the minke and finback. Single minke whales were seen almost daily. Adult pairs were only seen on four dates, and no adult-calf pairs were observed. Twenty-two small minkes were observed; three were possibly 1st-year calves. Finbacks occurred singly and in groups, particularly later in the field season. Resightings of distinctive finbacks indicate that adult pairings are temporary. One finback had been seen in the area in 1973–1975. Adult–calf pairs and seven single juveniles were also seen. Observations of finbacks pursued by whale watchers provide evidence that some regulation of the rapidly growing whale-watching industry may be warranted. Blue whales and humpback whales were seen far less frequently than minkes and finbacks. The relative abundances of minke, finback, and humpback were similar to 1973–1974 in the same area: however, blue whales were seen far more frequently in the past.

scholarly journals Impacts of Agricultural Areas on Spatio-Temporal Variability of Daily Minimum Extreme Flows during the Transitional Seasons (Spring and Fall) in Southern Quebec

Water ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 3487
Author(s):  
Ali Arkamose Assani ◽  
Ayoub Zeroual ◽  
Alexandre Roy ◽  
Christophe Kinnard
Keyword(s):  
Temporal Variability ◽  
The South ◽  
Extreme Flows ◽  
North Shore ◽  
Daily Minimum ◽  
The North ◽  
South Shore ◽  
Spatio Temporal ◽  
The 1960S ◽  
Agricultural Areas

Several statistical methods were used to analyze the spatio-temporal variability of daily minimum extreme flows (DMEF) in 17 watersheds—divided into three homogenous hydroclimatic regions of southern Quebec—during the transitional seasons (spring and fall), during the 1930–2019 period. Regarding spatial variability, there was a clear difference between the south and north shores of the St. Lawrence River, south of 47° N. DMEF were lower in the more agricultural watersheds on the south shore during transitional seasons compared to those on the north shore. A correlation analysis showed that this difference in flows was mainly due to more agricultural areas ((larger area (>20%) on the south than on the north shore (<5%)). An analysis of the long-term trend of these flows showed that the DMEF of south-shore rivers have increased significantly since the 1960s, during the fall (October to December), due to an increase in rainfall and a reduction in cultivated land, which increased the infiltration in the region. Although there was little difference between the two shores in the spring (April to June), we observed a decrease in minimum extreme flows in half (50%) of the south-shore rivers located north of 47° N.

Distribution of Enteric Bacteria in the Quebec City Section of the St-Lawrence River

1974 ◽  
Vol 9 (1) ◽  
pp. 107-114
Author(s):  
Ronald E. Simard ◽  
John A. Zee
Keyword(s):  
Fecal Coliform ◽  
Enteric Bacteria ◽  
Quebec City ◽  
Klebsiella Pneumonia ◽  
North Shore ◽  
The North ◽  
South Shore ◽  
Total Bacteria ◽  
St Lawrence River ◽  
Made In

Abstract During the summer of 1973, a survey was made in order to establish the level of enteric bacteria in the sediments and water of the St-Lawrence River. In the sediments, the number of total bacteria, yeast and mold fluctuates from station to station and with the tide. Higher counts of total and fecal coliform were encountered on the north shore than on the south shore resulting from Quebec City sewerage. The number of fecal bacteria decreased when approaching the Gulf and their number was higher at rising tide. The main species encountered were Klebsiella pneumonia, Salmonella enteridis and Escherichia spp.

Relationship between the Atlantic Multidecadal Oscillation index and variability of mean annual flows for catchments in the St. Lawrence watershed (Quebec, Canada) during the past century

2010 ◽  
Vol 41 (2) ◽  
pp. 115-125 ◽  
Author(s):  
Ali A. Assani ◽  
David Landais ◽  
Mhamed Mesfioui ◽  
Martin Matteau
Keyword(s):  
Temporal Variability ◽  
Atlantic Multidecadal Oscillation ◽  
Past Century ◽  
Left Bank ◽  
The South ◽  
North Shore ◽  
The North ◽  
South Shore ◽  
Atlantic Multidecadal Oscillation Index ◽  
Continental Climate

This paper, based on an analysis of the mean annual flow (MAF) of 16 natural rivers over the period 1934–2000, has the following goals: (1) to determine the different temporal variability modes of the MAF in the St. Lawrence watershed, (2) to describe the temporal variability of the streamflow in each mode and (3) to analyze the influence of the AMO (Atlantic Multidecadal Oscillation) on the interannual and interdecadal variability of mean annual flows in this Quebec watershed. This paper shows that the interannual variability of mean annual flow was not synchronous on both sides of the river. During the period analyzed, MAF variability was characterized by a tendency to decrease on the south shore (right bank) but to increase on the north shore (left bank). A correlation analysis reveals that the influence of the AMO was limited exclusively to the north shore of the river, which is characterized by a continental climate. This correlation is negative. On the south shore, streamflow is correlated negatively to the AO (Arctic Oscillation).

Mud Cracks and Polygons on Ice Push Ridges, in Tidal Flats of the St. Lawrence Estuary

1974 ◽  
Vol 11 (3) ◽  
pp. 489-494 ◽  
Author(s):  
Jean-Claude Dionne
Keyword(s):  
Water Level ◽  
Tidal Flats ◽  
The South ◽  
Lawrence Estuary ◽  
Waves And Currents ◽  
South Shore ◽  
Break Up ◽  
St Lawrence Estuary

Mud cracks and polygons form during summer in tidal flats of the south shore of the St. Lawrence Estuary. They occur near mean low water level at the top surface of ice push mud ridges formed during winter and break-up. They are a source of mud clasts which settle in the surroundings when carried away by waves and currents.

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