By Charles E. Herdendorf (auth.), Max M. Tilzer, Colette Serruya (eds.)
The overwhelming majority of the world's lakes are small in dimension and brief lived in geological phrases. merely 253 of the millions of lakes in the world have floor components better than 500 sq. kilometers. firstly sight, this statistic would appear to point that giant lakes are fairly unimportant on a world scale; in truth, notwithstanding, huge lakes include the majority of the liquid floor freshwater of the earth. simply Lake Baikal and the Laurentian nice Lakes by myself comprise greater than 38% of the world's overall liquid freshwater. therefore, the massive lakes of the area intensify a big function of the earth's freshwater reserves-its super abnormal distribution. The power quandary of the Seventies and Nineteen Eighties made us conscious of the truth that we are living on a spaceship with finite, that's, exhaustible assets. however, the strength difficulty ended in an overemphasis on all of the matters pertaining to power provide and the entire difficulties hooked up with generating new power. The strength predicament additionally led us to disregard robust facts suggesting that water of applicable caliber for use as a resouce should be used up extra speedy than power will. even though in precept water is a "renewable resource," the world's water reserves are diminishing in models, the consequences of that are multiplicative: greater intake and speeded up degradation of quality.
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Extra info for Large Lakes: Ecological Structure and Function
The mixis, or annual circulation pattern, of 91 % of the large lakes is known or has been estimated from the latitude/elevation relationship given by Hutchinson and Laffler (1956). Accordingly, 53% of the lakes are classified as dimictic, 23% as polymictic, 16% as monomictic, 5% as meromictic, and 3% as amictic. For those lakes with no bathymetric data, mixing patterns could not be estimated with any degree of certainty. Biological and water quality information is lacking for many large lakes. However, water chemistry, primary productivity, and fish yield data are available for about 25% of the lakes.
Thus, the name plankton was chosen to indicate the most apparent condition of their life, the fact that they are driven around by the continual motion of the water in which they live. In short, one could characterize the two kinds of ecosystems by their respective dominant physical force, kinetic for the aquatic system, gravitational for the terrestrial one. The purpose of this article is to explore in greater detail how the physical environment, the "aquatic weather," interacts with life, that is, how it selects for certain species which are particularly adapted to the specific properties of the different water bodies such as oceans and lakes.
CJ ~ '"........... ~ ..... ;::, 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 Map no. (Fig. 1) Bangweulu Bay Becharof Beloye Beysehir Bienville Big Trout Biwa Bras d'Or Buenos Aires Buffalo Buyr Caratasca Caspian Cedar Chad Champlain Chany Chao Chapala Chilka Chilwa Chiquita Chiriqui Churchill Claire Clinton Lake 4920' 890 1190 1290 650 1249 661 688 1099 2240 612 610 1110 374000 1353 16600' 1100 2500' 900 1140 1170' 1040 1850 900 559 1436 737 Area (km2) Appendix to Chapter 1 Continued 5 3 44 5 2 11 28 31 2 2 78200 44 54 5 10 4 2 5 2 40 103 70 11 5 1025 12 122 10 13 5 5 21 2 Volume (km 3 ) 5 6 92 20 9 Max.
Large Lakes: Ecological Structure and Function by Charles E. Herdendorf (auth.), Max M. Tilzer, Colette Serruya (eds.)