Major Findings 



Air 



-0. j- 



1 . 1 



U. 1 



I .i 



CO , 

 400 





O.h 



1 — f 



0.7 0.8 

 I 



DOC 

 12bh 



— r 



Zooplankton 

 20 



.0.1 



liat- tL-r ixi 

 1 .4 



-14.5- 

 -12.1- 



Det r Itus 



48 



— v./- 



50 



Water 



Algae 

 700 



-T 

 0.2 



L 



Bacteria 

 1500 



n 



DOC 

 1500 



-250- 



Protozoa | 

 36 



C CO 



01 «-» o 



ex C 3 



5C tn o 



I- " o 



o c — 



e tT3 - 



_D — ' ^^ 



3 0.— 



770 



512 * 



CO, 



460 



400 



I— 300- 



New 

 Detritus 



24,000 



Old 

 Detritus 

 3,816,000 



Micro- 

 metazoa 



35 



Sediment 



_^3^__J 



-284- 



100 -• 



IS) o 



u o 



O CD 

 O - 



cc o 



CO 



380 



2 50 



CO^ 

 400 



n 



Animals 

 1350 



16- 



■170- 



FIGURE 1-5. Carbon flux through a typical tundra pond. Measurements 

 were made on 12 July 1971. On this date, the average depth of the water 

 was 10 cm and the depth of the sediment was taken as 5 cm. Units of the 

 standing crop (in boxes) are mg C m~^ and transfer rates (arrows) are mg 

 C m'^ day'\ 



organic carbon to the sediments where it enters the detritus food web 

 (Figure 1-5). Here, the abundant detritus is a large reservoir of food for 

 animals while the decomposition of the organic matter provides a steady 

 supply of nutrients for algae. The contrast between the sediment and water 



