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Fishery Bulletin 101(4) 



Blood collection 



Figure 1 



Blood pH (A), PcOj (B), and lactate (C) measured prior to and after three succes- 

 sive forced submergence episodes in loggerhead sea turtles in the laboratory. Blood 

 collection 1, 3, and 5 are presubmergence samples, whereas blood collection 2, 4, 

 and 6 are postsubmergence samples. Blood collection 7 was taken 180 min after 

 the final submergence. The surface interval between the submergences was 10 

 min (T), 42 min (•), or 180 min (■). Data from control sea turtles (A) are shown 

 for comparison. 



for Po.2 and norepinephrine, respectively). Collection of the 

 fourth sample from nonsubmerged control turtles revealed 

 no significant changes in blood pH, PCO2, or lactate when 

 compared to the third sample (Figs. 1 and 2). 



The remaining serial blood samples revealed comparable 

 patterns in the blood pH, Pco.,, Po,, lactate, and norepi- 

 nephrine. Turtles given a longer rest interval at the surface 

 (after the second submergence^ had enhanced recovery of 



