Survival and heterotrophic activities of Fraser River and Strait of Georgia bacterioplankton within the Fraser River plume

1981 ◽  
Vol 64 (3) ◽  
pp. 231-241 ◽  
Author(s):  
M. Valdés ◽  
L. J. Albright
Keyword(s):  
River Plume ◽  
Fraser River ◽  
Strait Of Georgia

The Fraser River plume, Strait of Georgia

1981 ◽  
Vol 6 (2-3) ◽  
pp. 201-221 ◽  
Author(s):  
J.A. Stronach
Keyword(s):  
River Plume ◽  
Fraser River ◽  
Strait Of Georgia

Production studies in the strait of Georgia. Part II. Secondary production under the Fraser River plume, February to May, 1967

1969 ◽  
Vol 3 (1) ◽  
pp. 39-50 ◽  
Author(s):  
T.R. Parsons ◽  
R.J. LeBrasseur ◽  
J.D. Fulton ◽  
O.D. Kennedy
Keyword(s):  
Secondary Production ◽  
River Plume ◽  
Fraser River ◽  
Strait Of Georgia ◽  
Production Studies

Observations on double chlorophyll maxima in the vicinity of the Fraser River plume, Strait of Georgia, British Columbia

1990 ◽  
Vol 143 (1-2) ◽  
pp. 139-146 ◽  
Author(s):  
W.P. Cochlan ◽  
P.J. Harrison ◽  
P.J. Clifford ◽  
K. Yin
Keyword(s):  
British Columbia ◽  
River Plume ◽  
Fraser River ◽  
Strait Of Georgia

Review of the Biological Oceanography of the Strait of Georgia: Pelagic Environment

1983 ◽  
Vol 40 (7) ◽  
pp. 1064-1094 ◽  
Author(s):  
P. J. Harrison ◽  
J. D. Fulton ◽  
F. J. R. Taylor ◽  
T. R. Parsons
Keyword(s):  
Food Web ◽  
Primary Productivity ◽  
Larval Fish ◽  
Standing Stock ◽  
River Plume ◽  
Limiting Factors ◽  
Fraser River ◽  
Strait Of Georgia ◽  
The North ◽  
Rate Processes

Different components of the food web in the Strait of Georgia are reviewed. The phytoplankton are dominated by diatoms; however, flagellates may dominate in the winter. Chlorophyll a concentrations may range from < 1 mg∙m−3 in the winter to > 15 mg∙m−3 during blooms. The average annual primary productivity is about 280 g C∙m−2 for the strait, but it is higher in frontal areas at the north and south ends of the strait and near the Fraser River plume. Light limits primary productivity during the winter months, while nutrients (nitrogen) and grazing are the limiting factors during the late spring and summer. Turbidity and salinity effects occur near the Fraser River plume. The surface macrozooplankton community is composed chiefly of copepods. Mid- and deep-water communities consist of euphausiids, chaetognaths, and some deep-living copepods, which overwinter at depth. The standing stock of macrozooplankton (> 350 μm) to 400 m, ranges from 0.1 to 2.0 g wet wt∙m−3. Few estimates of secondary production and standing stock estimates of microzooplankton have been made. Horizontal patches of zooplankton have been encountered and may be important feeding sites for some fish. Standing stock associations of the dominant species in the food web of the strait are reasonably well known, but assessment of food web dynamics from these limited standing stock measurements is often inaccurate. There is a noticeable absence of data on how rate processes affect standing stocks, and it is particularly an understanding of these interrelationships that is needed for fisheries management. There is an urgent need for more interaction between biological oceanographers and fisheries scientists, particularly in the area of zooplankton grazing by larval fish.

Pacific salmon and Pacific herring mortalities in the Fraser River plume caused by river lamprey (Lampetra ayresi)

1995 ◽  
Vol 52 (3) ◽  
pp. 644-650 ◽  
Author(s):  
Richard J. Beamish ◽  
Chrys-Ellen M. Neville
Keyword(s):  
Chinook Salmon ◽  
Coho Salmon ◽  
Pacific Salmon ◽  
River Plume ◽  
Clupea Harengus ◽  
Pacific Herring ◽  
Fraser River ◽  
Strait Of Georgia ◽  
Abundance Estimates ◽  
River Lamprey

River lamprey (Lampetra ayresi) enter the Strait of Georgia from the Fraser River and feed almost exclusively on Pacific herring (Clupea harengus) and salmon (Oncorhynchus spp.). Although the major prey of river lamprey is Pacific herring, the greater effect of lamprey predation was on the populations of chinook (O. tshawytscha) and coho (O. kisutch) salmon. In 1990 and 1991, river lamprey killed a minimum of 20 million and 18 million chinook salmon, respectively, and a minimum of 2 million and 10 million coho salmon in the same years. In 1991, river lamprey in the Fraser River plume killed an equivalent of approximately 65 and 25% of the total Canadian hatchery and wild production of coho and chinook salmon, respectively. These estimates are probably low because river lamprey also feed in other areas and the abundance estimates are conservative. These high mortality rates indicate that river lamprey predation must be considered as a major source of natural mortality of chinook and coho salmon in the Strait of Georgia.

Mathematical Modelling of the Fraser River Plume

1988 ◽  
Vol 23 (1) ◽  
pp. 179-614 ◽  
Author(s):  
J. A. Stronach ◽  
P.B. Crean ◽  
T.S. Murty
Keyword(s):  
Large River ◽  
River Plume ◽  
Wind Forcing ◽  
Surface Currents ◽  
Fraser River ◽  
Layer Model ◽  
Strait Of Georgia ◽  
Extensive Field ◽  
Strong Surface ◽  
Surface Drifters

Abstract The Fraser River forms a well-defined layer of brackish water in the Strait of Georgia, with associated strong surface currents and salinity contrasts between it and the much deeper underlying waters. The numerical solution of a rotating, non-linear, reduced gravity, vertically integrated, upper layer model to describe the motion of this large river plume is described. Results from extensive field observations including tracking of surface drifters and CTD surveys are used to adjust and verify the model. Comparisons of observed and computed velocity and salinity fields show that the model simulates well the dominant flow patterns of the plume. A hindcast of two time periods in June and November 1986 is presented. Both hindcasts were characterized by periods of calm winds as well as the passage of reasonably intense storms, so that the response of the plume to wind forcing, as distinct from the wind-free situation, was quite well delineated.

scholarly journals Nutrient and plankton dynamics in the Fraser River plume, Strait of Georgia, British Columbia

1991 ◽  
Vol 70 ◽  
pp. 291-304 ◽  
Author(s):  
PJ Harrison ◽  
PJ Clifford ◽  
WP Cochlan ◽  
K Yin ◽  
MA StJohn ◽  
...  
Keyword(s):  
British Columbia ◽  
River Plume ◽  
Fraser River ◽  
Plankton Dynamics ◽  
Strait Of Georgia

The Qualitative and Quantitative Distribution of Plankton in the Strait of Georgia in Relation to Certain Oceanographic Factors

1957 ◽  
Vol 14 (4) ◽  
pp. 521-552 ◽  
Author(s):  
Joseph Eugène Henri Légaré
Keyword(s):  
Salinity Gradient ◽  
General Distribution ◽  
Fraser River ◽  
Strait Of Georgia ◽  
Quantitative Distribution ◽  
Qualitative And Quantitative ◽  
Chemical Factors ◽  
Physical And Chemical ◽  
Plankton Communities ◽  
Made In

In order to gain some picture of the seasonal variations in the plankton communities two cruises were made in the Strait of Georgia, one in June 1955, and the other in November 1955; 165 plankton collections were taken, also surface temperatures.The correlation of these data have resulted in a number of conclusions concerning the distribution of plankton in the Strait of Georgia. The chief factor affecting the general distribution of plankton is the salinity gradient. The inflow of fresh water from the Fraser River forms zones of varying properties, and leads to the development of different plankton communities. The extent to which physical and chemical factors may determine the presence or absence of certain organisms from the zones described is discussed.

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