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Table 2.

Summary of rehydration dynamics for 11 Gila monsters (Heloderma suspectum) when dehydrated to an ecologically relevant plasma osmolality and then provided water ad libitum for 24 h

Body mass (±0.1 g)Plasma osmolality (mOsmol kg-1)Tail volume (±1 ml)Urinary bladder length (±0.1 mm)Urinary bladder width (±0.1 mm)
Initial 401.0±29.1 (284-298) 292±1 (284-298) 48±3 (30-62) — — 
Dehydrated 294.8±15.1*,(221-395) 359±2*,(351-372) 36±2* (23-50) 
Rehydrated 378.1±19.6 (286-507) 289±3 (275-311) 37±2(25-48) 52.5±3.1 (41.6-76.2) 16.1±1.6 (9.7-28.1) 
Body mass (±0.1 g)Plasma osmolality (mOsmol kg-1)Tail volume (±1 ml)Urinary bladder length (±0.1 mm)Urinary bladder width (±0.1 mm)
Initial 401.0±29.1 (284-298) 292±1 (284-298) 48±3 (30-62) — — 
Dehydrated 294.8±15.1*,(221-395) 359±2*,(351-372) 36±2* (23-50) 
Rehydrated 378.1±19.6 (286-507) 289±3 (275-311) 37±2(25-48) 52.5±3.1 (41.6-76.2) 16.1±1.6 (9.7-28.1) 

Rehydrated values are also compared to initial, pre-dehydration values for the same animals.

Values shown are mean ± 1 s.e.m. (range in parentheses).

*

Significant difference (P<0.05) between initial and dehydrated groups.

Significant difference (P<0.05) between dehydrated and rehydrated groups.

Significant difference (P<0.05) between initial and rehydrated groups.

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