bio155_Lecture_2_origins_morphometry

bio155_Lecture_2_origins_morphometry - BIOE 155, Fall 2009...

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BIOE 155, Fall 2009 PHYSICAL: Types, morphometry, and origins of lakes and streams (read: pp 164; 265-288 in Dodson) WATER IN THE BIOSPHERE There is very little accessible fresh water in the biosphere Volume (km 3 * 1000) Percent of Total Percent of available freshwater Renewal time (years) Oceans 1,370,000 97.61 0 3100 Polar ice, glaciers 29,000 2.08 0 16,000 Groundwater 4000 0.29 95.4 300 Freshwater lakes 125 0.009 3.0 1-100 Saline lakes 104 0.008 0 10-1000 Soils 67 0.005 1.6 280 days Rivers 1.2 0.00009 0.03 12-20 days Atmosphere 14 0.0009 0 9 days Table modified from Wetzel (2001) Surface water o Lakes ± Fresh ± Saline o Reservoirs ± Streams that are blocked by a dam o Streams o Wetlands—regions of shallow and slow surface flow that have rooted and emergent aquatic plants ( macrophytes ) Ground water—water below the surface of the earth o Important source of drinking water ± 50% of world population ± 95% of rural America o Easily depleted (renewal time ~ 300 years) o Aquifers—deep reservoirs of ground water.
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BIOE 155, Fall 2009 MAJOR AQUATIC COMMUNITIES (pp 164 in Dodson) Lentic—standing water (lakes) Lotic—flowing water (streams) Lakes o Pelagic zone—open water o Littoral zone—near shore o Benthic community—located at the bottom of the lake Streams
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This note was uploaded on 11/06/2009 for the course BIO 155 taught by Professor Moore during the Fall '09 term at UCSC.

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bio155_Lecture_2_origins_morphometry - BIOE 155, Fall 2009...

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