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Table 1.

Summary of initial and final body condition indicators of Gila monsters(Heloderma suspectum) and the number of days required for them to reach an ecologically relevant dehydration state having either a full or empty urinary bladder

Days to dehydrated plasma osmolalityStandard body mass (±1 g)Tail volume (±1 ml)Plasma osmolality (mOsmol kg-1)
Initial:     
    FULL 366±89 (269-506) 51±8 (43-62) 290±5 (284-298) 
    EMT 330±52 (264-383) 43±11 (30-57) 293±2 (291-296) 
    d.f. 10 10 10 
    t-statistic -1.22 -1.30 1.21 
    P value 0.25 0.22 0.25 
Final:     
    FULL 79±8 (41-120) 307±25 (221-395) 38±4 (27-50) 358±3 (351-372) 
    EMT 33±5 (29-41) 267±18 (204-327) 35±3 (24-44) 362±2 (354-370) 
    d.f. 10 10 10 10 
    t-statistic -3.19 -1.30 -0.40 1.09 
    P value *0.01 0.22 0.70 0.30 
Days to dehydrated plasma osmolalityStandard body mass (±1 g)Tail volume (±1 ml)Plasma osmolality (mOsmol kg-1)
Initial:     
    FULL 366±89 (269-506) 51±8 (43-62) 290±5 (284-298) 
    EMT 330±52 (264-383) 43±11 (30-57) 293±2 (291-296) 
    d.f. 10 10 10 
    t-statistic -1.22 -1.30 1.21 
    P value 0.25 0.22 0.25 
Final:     
    FULL 79±8 (41-120) 307±25 (221-395) 38±4 (27-50) 358±3 (351-372) 
    EMT 33±5 (29-41) 267±18 (204-327) 35±3 (24-44) 362±2 (354-370) 
    d.f. 10 10 10 10 
    t-statistic -3.19 -1.30 -0.40 1.09 
    P value *0.01 0.22 0.70 0.30 

FULL, animals with a full bladder at the start of the experiment; EMT,animals with an empty bladder at the start of the experiment.

Values shown are mean ±1 s.e.m. (minima and maxima in parentheses); N=6 per treatment.

*

Significant difference (α=0.05) between treatment groups.

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