Oxygen Pulse in Eagle Lake 



3U 



toral station than at the pelagic station. In other words the maximum 

 is greater and the minimum less at the littoral station than at the iielagic. 

 This means that there was more photosynthesis on the one hand 

 and more respiration and decay on the other in the dense population 

 of the littoral station. 



and left scale ^ cc. oxygen per liter. 



and middle scale :=; per cent saturation, 



and right scale ^^ temperature . 



Fig. 1. Graiih of records taken at Eagle Lake Littoral Station, August 9, 1922. 



-^LittoTa.1 



■— Peiajic 



Fig. 2. Graph comparing the records taken at littoral and pelagic stations, re- 

 spectively, August 9, 1922. 



Series 3 is essentially like Curve 2 except that the maxima at both 

 .stations occurred at 3:30 p. m. At 6 p. m. a wind arose and from that 

 time until 9 p. m. the curves approached each other. 



It is evident from the data that an oxygen pulse occurs in the sur- 

 face water of Eagle Lake on calm, clear days and that this pulse is 



