Examining primary producer–consumer interactions in a Lake Superior tributary using 15N-tracer, grazer-reduction, and nutrient-bioassay experiments

2003 ◽  
Vol 22 (3) ◽  
pp. 371-387 ◽  
Author(s):  
Kay M. Rezanka ◽  
Anne E. Hershey
Keyword(s):  
Lake Superior ◽  
15N Tracer ◽  
Nutrient Bioassay ◽  
Primary Producer ◽  
Consumer Interactions

Development of apical pits in chloride cells of the gills of Pimephales promelas after chronic exposure to acid water

1983 ◽  
Vol 41 ◽  
pp. 462-463
Author(s):  
Richard L. Leino ◽  
Jon G. Anderson ◽  
J. Howard McCormick
Keyword(s):  
Confidence Interval ◽  
Chronic Exposure ◽  
Lake Superior ◽  
Pimephales Promelas ◽  
Chloride Cells ◽  
Fathead Minnows ◽  
Secondary Lamellae ◽  
Untreated Water ◽  
Water Ph ◽  
Flow Through

Groups of 12 fathead minnows were exposed for 129 days to Lake Superior water acidified (pH 5.0, 5.5, 6.0 or 6.5) with reagent grade H2SO4 by means of a multichannel toxicant system for flow-through bioassays. Untreated water (pH 7.5) had the following properties: hardness 45.3 ± 0.3 (95% confidence interval) mg/1 as CaCO3; alkalinity 42.6 ± 0.2 mg/1; Cl- 0.03 meq/1; Na+ 0.05 meq/1; K+ 0.01 meq/1; Ca2+ 0.68 meq/1; Mg2+ 0.26 meq/1; dissolved O2 5.8 ± 0.3 mg/1; free CO2 3.2 ± 0.4 mg/1; T= 24.3 ± 0.1°C. The 1st, 2nd and 3rd gills were subsequently processed for LM (methacrylate), TEM and SEM respectively.Three changes involving chloride cells were correlated with increasing acidity: 1) the appearance of apical pits (figs. 2,5 as compared to figs. 1, 3,4) in chloride cells (about 22% of the chloride cells had pits at pH 5.0); 2) increases in their numbers and 3) increases in the % of these cells in the epithelium of the secondary lamellae.

Enumeration and Identification of Asbestos Fibres in Water

1974 ◽  
Vol 32 ◽  
pp. 526-527 ◽  
Author(s):  
O. Mudroch ◽  
J. R. Kramer
Keyword(s):  
Water Supply ◽  
Water Samples ◽  
Drainage Basin ◽  
Lake Superior ◽  
Research Work ◽  
List Type ◽  
The West ◽  
Asbestos Fibre ◽  
Amphibole Asbestos

Approximately 60,000 tons per day of waste from taconite mining, tailing, are added to the west arm of Lake Superior at Silver Bay. Tailings contain nearly the same amount of quartz and amphibole asbestos, cummingtonite and actinolite in fibrous form. Cummingtonite fibres from 0.01μm in length have been found in the water supply for Minnesota municipalities.The purpose of the research work was to develop a method for asbestos fibre counts and identification in water and apply it for the enumeration of fibres in water samples collected(a) at various stations in Lake Superior at two depth: lm and at the bottom.(b) from various rivers in Lake Superior Drainage Basin.

Lake Superior

2009 ◽  
Author(s):  
Louis Agassiz
Keyword(s):  
Lake Superior

The Mineral Riches of the Lake Superior Region

1863 ◽  
Vol 8 (2) ◽  
pp. 20-20
Keyword(s):  
Lake Superior

Lake Superior Iron Ore

1859 ◽  
Vol 1 (19) ◽  
pp. 303-303
Keyword(s):  
Iron Ore ◽  
Lake Superior

Fecundity of the sea lamprey (Petromyzon marinus) in Lake Superior

1972 ◽  
Vol 101 (4) ◽  
pp. 718-720 ◽  
Author(s):  
Patrick J. Manion
Keyword(s):  
Lake Superior ◽  
Petromyzon Marinus ◽  
Sea Lamprey

Declining Survival of Lake Trout Stocked during 1963–1986 in U.S. Waters of Lake Superior

1994 ◽  
Vol 14 (2) ◽  
pp. 395-402 ◽  
Author(s):  
Michael J. Hansen ◽  
Mark P. Ebener ◽  
Richard G. Schorfhaar ◽  
Stephen T. Schram ◽  
Donald R. Schreiner ◽  
...  
Keyword(s):  
Lake Trout ◽  
Lake Superior

The amphibole gruenerite of the Lake Superior region

1927 ◽  
Vol s5-14 (80) ◽  
pp. 150-154 ◽  
Author(s):  
S. Richarz
Keyword(s):  
Lake Superior

Forest canopy disturbance geospatial data for Lake Superior basin, USA, 1985-2008

2014 ◽  
Author(s):  
Ian W. Housman ◽  
Mark D. Nelson ◽  
Charles H. Perry ◽  
Kirk M. Stueve ◽  
Chengquan Huang
Keyword(s):  
Forest Canopy ◽  
Lake Superior ◽  
Geospatial Data ◽  
Canopy Disturbance
Sign in / Sign up

Export Citation Format

Share Document