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Table 2.

Shell total Ca, [Pi] and CO2 of hatchling Graptemys geographica, Chelydra serpentina and Chrysemys picta, and adult C. picta with air access (controls), submerged in normoxic water or anoxic water, and exposed to nitrogen at 3°C

Hatchling
Adult
G. geographicaC. serpentinaC. pictaC. picta
Total Ca (μmol g-1 wet mass shell)      
 Air-access 240.2±47.3* (5) 171.7±24.3a,† (5) 172.1±50.4 (5)  
 Normoxic water 265.4±35.5 (5) 254.6±35.5b (5) 183.1±268.3 (2) 3267.0±122.1 (5) 
 Anoxic water  249.3±21.2b (5) 240.0±77.4 (5) 3487.1±260.0 (4) 
 Nitrogen 246.5±28.6 (5) 245.8±17.9b (5) 224.5±33.5 (6)  
[Pi] (μmol g-1 wet mass shell)      
 Air-access 165.4±29.0* (5) 120.4±24.9a,† (5) 115.8±30.0a,† (5)  
 Normoxic water 189.0±14.6 (5)* 153.5±8.8b,† (5) 127.5±208.2a,b,† (2) 1491.0±82.2 (5) 
 Anoxic water  178.1±15.4b (5) 174.0±50.9b (5) 1375.4±185.9 (4) 
 Nitrogen 183.6±15.9 (5) 178.6±12.5b (5) 178.4±29.6b (6)  
Total CO2 (mmol g-1 dry mass shell)      
 Air-access 0.13±0.02a,* (5) 0.23±0.03a,† (5) 0.16±0.06a,* (4) 1.22±0.01 (8) 
 Normoxic water 0.10±0.04a,* (5) 0.25±0.06a,† (5)  1.16±0.15 (8) 
 Anoxic water  0.06±0.04b (4) 0.04±0.02b (4) 0.97±0.15 (6) 
 Nitrogen 0.04±0.01b (5) 0.07±0.04b (5) 0.04±0.04b (3)  
Hatchling
Adult
G. geographicaC. serpentinaC. pictaC. picta
Total Ca (μmol g-1 wet mass shell)      
 Air-access 240.2±47.3* (5) 171.7±24.3a,† (5) 172.1±50.4 (5)  
 Normoxic water 265.4±35.5 (5) 254.6±35.5b (5) 183.1±268.3 (2) 3267.0±122.1 (5) 
 Anoxic water  249.3±21.2b (5) 240.0±77.4 (5) 3487.1±260.0 (4) 
 Nitrogen 246.5±28.6 (5) 245.8±17.9b (5) 224.5±33.5 (6)  
[Pi] (μmol g-1 wet mass shell)      
 Air-access 165.4±29.0* (5) 120.4±24.9a,† (5) 115.8±30.0a,† (5)  
 Normoxic water 189.0±14.6 (5)* 153.5±8.8b,† (5) 127.5±208.2a,b,† (2) 1491.0±82.2 (5) 
 Anoxic water  178.1±15.4b (5) 174.0±50.9b (5) 1375.4±185.9 (4) 
 Nitrogen 183.6±15.9 (5) 178.6±12.5b (5) 178.4±29.6b (6)  
Total CO2 (mmol g-1 dry mass shell)      
 Air-access 0.13±0.02a,* (5) 0.23±0.03a,† (5) 0.16±0.06a,* (4) 1.22±0.01 (8) 
 Normoxic water 0.10±0.04a,* (5) 0.25±0.06a,† (5)  1.16±0.15 (8) 
 Anoxic water  0.06±0.04b (4) 0.04±0.02b (4) 0.97±0.15 (6) 
 Nitrogen 0.04±0.01b (5) 0.07±0.04b (5) 0.04±0.04b (3)  

Values are means ± s.e.m., N in parentheses.

Different superscript letters indicate significant differences within a species; *,†significant differences among hatchling species.

Graptemys geographica were maintained in anoxic water or nitrogen for 15 days and submerged in normoxic water for 75 days. Chelydra serpentina and Chrysemys picta hatchlings were kept anoxic for 31 days and submerged in normoxic water for 81 days.

Data for adult Chrysemys picta ions after 90 days of anoxia are from Jackson et al. (2000);total CO2, D. C. Jackson, S. A. Reese, J. M. Gall, C. Ruckdeschel and C. R.. Shoop, unpublished data.

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