scholarly journals Coastal circulation and water-column properties in the National Park of American Samoa, February–July 2015

2017 ◽  
Author(s):  
Curt D. Storlazzi ◽  
Olivia Cheriton ◽  
Kurt J. Rosenberger ◽  
Joshua B. Logan ◽  
Timothy B. Clark
Keyword(s):  
Water Column ◽  
National Park ◽  
American Samoa ◽  
Coastal Circulation

Passive acoustic monitoring of vessel presence at Rose Atoll and the National Park of American Samoa

2011 ◽  
Vol 130 (4) ◽  
pp. 2557-2557
Author(s):  
Pollyanna Fisher-Pool ◽  
Marc O. Lammers ◽  
Lisa M. Munger ◽  
Kevin Wong ◽  
Russell E. Brainard
Keyword(s):  
National Park ◽  
Acoustic Monitoring ◽  
American Samoa ◽  
Passive Acoustic Monitoring ◽  
Passive Acoustic

Excess Unsupported 210Pb in Lake Sediment from Rocky Mountain Lakes: A Groundwater Effect

1985 ◽  
Vol 42 (7) ◽  
pp. 1249-1254 ◽  
Author(s):  
Stephen A. Norton ◽  
Charles T. Hess ◽  
Geneva M. Blake ◽  
Marilyn L. Morrison ◽  
Jill Baron
Keyword(s):  
Water Column ◽  
National Park ◽  
Surface Sediments ◽  
Sediment Cores ◽  
Rocky Mountain ◽  
Dry Weight ◽  
Mountain Lakes ◽  
Rocky Mountain National Park ◽  
Sediment Surface ◽  
Unsupported 210Pb

Sediment cores from four high-altitude (approximately 3200 m) lakes in Rocky Mountain National Park, Colorado, were dated by 210Pb chronology. Background (supported) 210Pb activities for the four cores range from 0.26 to 0.93 Beq/g dry weight, high for typical oligotrophic lakes, integrated unsupported 210Pb ranges from 0.81 (a typical value for most lakes) to 11.0 Beq/cm2. The 210Pb activity in the surface sediments ranges from 1.48 to 22.2 Beq/g dry weight. Sediment from Lake Louise, the most unusual of the four, has 22.2 Beq/g dry weight at the sediment surface, an integrated unsupported 210Pb = 11.0 Beq/cm2, and supported 210Pb = 0.74 Beq/g dry weight. 226Ra content of the sediment is insufficient to explain either the high unsupported 210Pb or the Rn content of the water column of Lake Louise, which averaged 96.2 Beq/L. We concluded that 222Rn-rich groundwater entering the lake is the source of the high 222Rn in the water column. This, in turn, is capable of supporting the unusually high 210Pb flux to the sediment surface. Groundwater with high 222Rn may control the 210Pb budget of lakes where sediment cores have integrated unsupported 210Pb greater than 2 Beq/cm2.

Diel dynamics of vertical changes of chlorophyll and bacteriochlorophyll in small humic lakes

2010 ◽  
Vol 39 (3) ◽  
Author(s):  
Tomasz Joniak ◽  
Piotr Klimaszyk ◽  
Marek Kraska
Keyword(s):  
Water Column ◽  
Vertical Profile ◽  
Physicochemical Parameters ◽  
National Park ◽  
Euphotic Zone ◽  
Humic Lakes ◽  
Oxygen Conductivity ◽  
Diel Dynamics ◽  
Vertical Changes ◽  
Diel Variability

Diel dynamics of vertical changes of chlorophyll and bacteriochlorophyll in small humic lakesThe diel variability of algal and bacterial chlorophyll and the physicochemical parameters (temperature, pH, dissolved oxygen, conductivity, transparency) in the vertical profile of three mid-forest humic lakes in Drawa National Park (northwest Poland) were analyzed in summer. The euphotic zone consisted of the smaller part of the water column in poly- and mesohumic lakes but almost the whole water column of the oligohumic lake. The 24-hour dynamics of chlorophyll

Ultrastructural Localization of Phycocyanin in the Acidophilic, Thermophilic Alga, Cyanidium Caldarium

1973 ◽  
Vol 31 ◽  
pp. 462-463
Author(s):  
M. R. Edwards ◽  
J. D. Mainwaring
Keyword(s):  
Yellowstone National Park ◽  
National Park ◽  
Ultrastructural Localization ◽  
Review Of Literature ◽  
Cyanidium Caldarium ◽  
Taxonomic Rank ◽  
Thin Sections ◽  
Standard Methods ◽  
Laboratory Cultures

Although the general ultrastructure of Cyanidium caldarium, an acidophilic, thermophilic alga of questionable taxonomic rank, has been extensively studied (see review of literature in reference 1), some peculiar ultrastructural features of the chloroplast of this alga have not been noted by other investigators.Cells were collected and prepared for thin sections at the Yellowstone National Park and were also grown in laboratory cultures (45-52°C; pH 2-5). Fixation (glutaraldehyde-osmium), dehydration (ethanol), and embedding (Epon 812) were accomplished by standard methods. Replicas of frozenfracture d- etched cells were obtained in a Balzers apparatus. In addition, cells were examined after disruption in a French Press.

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