Lake trophic state and the limnological effects of omnivorous fish

Hydrobiologia ◽  
1996 ◽  
Vol 319 (3) ◽  
pp. 213-223 ◽  
Author(s):  
Ray W. Drenner ◽  
J. Durward Smith ◽  
Stephen T. Threlkeld
Keyword(s):  
Trophic State ◽  
Omnivorous Fish ◽  
Lake Trophic State

Direct Determination of Apatite in Lake Sediments

1980 ◽  
Vol 37 (4) ◽  
pp. 640-646 ◽  
Author(s):  
R. P. Reid ◽  
C. H. Pharo ◽  
W. C. Barnes
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Lake Sediments ◽  
Trophic State ◽  
Inorganic Phosphorus ◽  
Source Rocks ◽  
Emission Spectrometry ◽  
Phosphorus Load ◽  
Lake Trophic State ◽  
Scanning Electron

Apatite is a common accessory mineral in the source rocks for the glacial debris supplying sediments to many Canadian lakes. A method has been developed which uses scanning electron microscopy and energy dispersive X-ray emission spectrometry for direct identification of apatite. This method has been used to examine the apatite content of various size fractions in Kamloops Lake sediments. Apatite concentrations obtained by this direct examination correlate well (r > 0.999) with apatite concentrations determined by chemical analyses and indicate that, in addition to comprising as much as 70% of the total phosphorus load, apatite may comprise as much as one-third of the "dissolved" (< 0.45 μm) inorganic phosphorus load. Consequently the use of classical (e.g. Vollenweider 1968; Vollenweider and Dillon 1974) methods of estimating lake trophic state from inorganic phosphorus concentrations in lake water must be done with care, recognizing that the bulk of inorganic phosphorus in lakes deriving sediment from glaciated igneous or metamorphic terrains may be in the form of apatite.Key words: apatite, lake, trophic state, phosphorus load, scanning electron microscopy

Lake trophic state change and constant algal composition following dilution and diversion

1992 ◽  
Vol 1 (3) ◽  
pp. 173-197 ◽  
Author(s):  
Eugene B. Welch ◽  
Richard P. Barbiero ◽  
Debra Bouchard ◽  
Clain A. Jones
Keyword(s):  
Trophic State ◽  
State Change ◽  
Lake Trophic State ◽  
Algal Composition

scholarly journals Example application of a continuous lake trophic state index on lakes with limited data

2019 ◽  
Author(s):  
Farnaz Nojavan ◽  
Betty J Kreakie ◽  
Jeffrey W Hollister ◽  
Song Qian
Keyword(s):  
Multilevel Model ◽  
Trophic State ◽  
The United States ◽  
Nutrient Concentrations ◽  
Trophic State Index ◽  
Gis Data ◽  
Lake Trophic State ◽  
State Index ◽  
Multiple Metrics ◽  
Over Time

Lake trophic state indices have long been used to provide a measure of the trophic state of lakes. Over time it has been determined that these indices perform better when they utilize multiple metrics and provide a continuous measurement of trophic state. We utilize such a method for trophic state that is based upon a Proportional Odds Logistic Regression (POLR) model and extend this model with a Bayesian multilevel model that predicts nutrient concentrations from universally available GIS data. This Bayesian multilevel model provides relatively accurate measures of trophic state and has an overall accuracy of 60%. The approach illustrates a method for estimating a continuous, mutli-metric trophic state index for any lake in the United States. Future improvements to the model will focus on improving overall accuracy and use variables that are more sensitive to change over time.

Sediment respiration and lake trophic state are important predictors of large CO2 evasion from small boreal lakes

2006 ◽  
Vol 12 (8) ◽  
pp. 1554-1567 ◽  
Author(s):  
PIRKKO KORTELAINEN ◽  
MIITTA RANTAKARI ◽  
JARI T. HUTTUNEN ◽  
TUIJA MATTSSON ◽  
JUKKA ALM ◽  
...  
Keyword(s):  
Trophic State ◽  
Boreal Lakes ◽  
Sediment Respiration ◽  
Lake Trophic State
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