Chemistry of Rocky Mountain Lakes

1989 ◽  
pp. 181-208 ◽  
Author(s):  
J. T. Turk ◽  
N. E. Spahr
Keyword(s):  
Rocky Mountain ◽  
Mountain Lakes

scholarly journals Thermal regimes of Rocky Mountain lakes warm with climate change

PLoS ONE ◽  
2017 ◽  
Vol 12 (7) ◽  
pp. e0179498 ◽  
Author(s):  
James J. Roberts ◽  
Kurt D. Fausch ◽  
Travis S. Schmidt ◽  
David M. Walters
Keyword(s):  
Climate Change ◽  
Rocky Mountain ◽  
Mountain Lakes ◽  
Thermal Regimes

Why Are Some Rocky Mountain Lakes Ephemeral?

2018 ◽  
Vol 54 (8) ◽  
pp. 5245-5263 ◽  
Author(s):  
David T. Liefert ◽  
Bryan N. Shuman ◽  
Andrew D. Parsekian ◽  
Jason J. Mercer
Keyword(s):  
Rocky Mountain ◽  
Mountain Lakes

scholarly journals Coherent late-Holocene climate-driven shifts in the structure of three Rocky Mountain lakes

The Holocene ◽  
2016 ◽  
Vol 26 (7) ◽  
pp. 1103-1111 ◽  
Author(s):  
Jeffery R Stone ◽  
Jasmine E Saros ◽  
Gregory T Pederson
Keyword(s):  
Late Holocene ◽  
Rocky Mountain ◽  
Mountain Lakes ◽  
Holocene Climate

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.

The distribution of four Chaoborus species (Diptera: Chaoboridae) along an elevation gradient in Canadian Rocky Mountain lakes

1994 ◽  
Vol 72 (9) ◽  
pp. 1531-1537 ◽  
Author(s):  
S. Lamontagne ◽  
D. B. Donald ◽  
D.W. Schindler
Keyword(s):  
Water Temperature ◽  
Sea Level ◽  
Elevation Gradient ◽  
Rocky Mountain ◽  
Mountain Lakes ◽  
Surface Water Temperature ◽  
Chaoborus Americanus ◽  
Valid Predictor ◽  
Lake Temperature ◽  
Warm Lakes

We tested the hypothesis that the distribution of four species of Chaoborus is limited by water temperature in Rocky Mountain lakes. Midsummer surface water temperature (MSSWT) of Rocky Mountain lakes varied between 25 and 5 °C along an elevation gradient spanning 600–2400 m above sea level. Chaoborus (subgenus Chaoborus) americanus and C. (C.) flavicans were collected in lakes with MSSWT ≥ 16 °C, generally corresponding to lakes at elevations lower than 1600 m above sea level. Chaoborus (Sayomyia) punctipennis was only collected in warm lakes (MSSWT ≥ 21 °C). Species of the subgenus Schadonophasma (C. trivittatus and possibly C. cooki) were not commonly collected, but preliminary data suggest that they may be more tolerant of low water temperatures than the other species. On a qualitative basis, the distribution of these chaoborids in the Rockies is similar to their latitudinal distribution. However, MSSWT as a valid predictor of Chaoborus species distribution with latitude remains to be tested. The gradient in lake temperature found in mountainous environments appears to be a useful gauge for obtaining information about the distribution of invertebrates relative to temperature.

scholarly journals Crossing Treeline: Bacterioplankton Communities of Alpine and Subalpine Rocky Mountain Lakes

2022 ◽  
Vol 12 ◽  
Author(s):  
Kim Vincent ◽  
Hannah Holland-Moritz ◽  
Adam J. Solon ◽  
Eli M. S. Gendron ◽  
Steven K. Schmidt
Keyword(s):  
Environmental Factors ◽  
Community Composition ◽  
Bacterial Communities ◽  
Rocky Mountain ◽  
Early Summer ◽  
Mountain Lakes ◽  
Mountain Watersheds ◽  
Subalpine Lakes ◽  
Key Players ◽  
Community Dissimilarity

From the aboveground vegetation to the belowground microbes, terrestrial communities differ between the highly divergent alpine (above treeline) and subalpine (below treeline) ecosystems. Yet, much less is known about the partitioning of microbial communities between alpine and subalpine lakes. Our goal was to determine whether the composition of bacterioplankton communities of high-elevation mountain lakes differed across treeline, identify key players in driving the community composition, and identify potential environmental factors that may be driving differences. To do so, we compared bacterial community composition (using 16S rDNA sequencing) of alpine and subalpine lakes in the Southern Rocky Mountain ecoregion at two time points: once in the early summer and once in the late summer. In the early summer (July), shortly after peak runoff, bacterial communities of alpine lakes were distinct from subalpine lakes. Interestingly, by the end of the summer (approximately 5 weeks after the first visit in August), bacterial communities of alpine and subalpine lakes were no longer distinct. Several bacterial amplicon sequence variants (ASVs) were also identified as key players by significantly contributing to the community dissimilarity. The community divergence across treeline found in the early summer was correlated with several environmental factors, including dissolved organic carbon (DOC), pH, chlorophyll-a (chl-a), and total dissolved nitrogen (TDN). In this paper, we offer several potential scenarios driven by both biotic and abiotic factors that could lead to the observed patterns. While the mechanisms for these patterns are yet to be determined, the community dissimilarity in the early summer correlates with the timing of increased hydrologic connections with the terrestrial environment. Springtime snowmelt brings the flushing of mountain watersheds that connects terrestrial and aquatic ecosystems. This connectivity declines precipitously throughout the summer after snowmelt is complete. Regional climate change is predicted to bring alterations to precipitation and snowpack, which can modify the flushing of solutes, nutrients, and terrestrial microbes into lakes. Future preservation of the unique alpine lake ecosystem is dependent on a better understanding of ecosystem partitioning across treeline and careful consideration of terrestrial-aquatic connections in mountain watersheds.

Evidence of deposition of anthropogenic pollutants in remote rocky mountain lakes

1984 ◽  
Vol 22 (4) ◽  
Author(s):  
Merrill Heit ◽  
Catherine Klusek ◽  
Jill Baron
Keyword(s):  
Rocky Mountain ◽  
Mountain Lakes ◽  
Anthropogenic Pollutants

scholarly journals Phytoplankton Dynamics in Three Rocky Mountain Lakes, Colorado, U.S.A.

1990 ◽  
Vol 22 (3) ◽  
pp. 264 ◽  
Author(s):  
Diane M. McKnight ◽  
Richard L. Smith ◽  
J. Platt Bradbury ◽  
Jill S. Baron ◽  
Sarah Spaulding
Keyword(s):  
Rocky Mountain ◽  
Mountain Lakes ◽  
Phytoplankton Dynamics

Mitbringsel aus den Ferien

Praxis ◽  
2005 ◽  
Vol 94 (47) ◽  
pp. 1869-1870
Author(s):  
Balestra ◽  
Nüesch
Keyword(s):  
Rocky Mountains ◽  
Spotted Fever ◽  
Rocky Mountain ◽  
Rickettsia Conorii ◽  
Rocky Mountain Spotted Fever ◽  
Klinische Diagnose ◽  
Rickettsia Rickettsii

Eine 37-jährige Patientin stellt sich nach der Rückkehr von einer Rundreise durch Nordamerika mit einem Status febrilis seit zehn Tagen und einem makulösem extremitätenbetontem Exanthem seit einem Tag vor. Bei suggestiver Klinik und Besuch der Rocky Mountains wird ein Rocky Mountain spotted fever diagnostiziert. Die Serologie für Rickettsia conorii, die mit Rickettsia rickettsii kreuzreagiert, war positiv und bestätigte die klinische Diagnose. Allerdings konnte der beweisende vierfache Titeranstieg, möglicherweise wegen spät abgenommener ersten Serologie, nicht nachgewiesen werden. Nach zweiwöchiger antibiotischer Therapie mit Doxycycline waren Status febrilis und Exanthem regredient.

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