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Table 1

Net cost of transport by burrowing and metabolic rate measurements for a selection of mammalian fossorial and semifossorial species

Mass (g)
NCOTb
MR (ml O2 min−1)
BurrowingBasal(kJ m−1)(J g−0.67 m−1)BurrowingBasalReference
Heterocephalus glaber 31.5 32.0 2.3 230 1.76 0.34 1, 2, 3 
Notomys alexis* 33.0 33.0 7.1 684 3.70 0.67 This study 
Georychus capensis 113.0 195.0 1.8 76 6.42 1.93 4, 5 
Thomomys bottae 150.0 143.0 6.4 224 10.3 2.00 
Cryptomys damarensis 152.1 138.0 2.0 68 7.68 1.31 3, 7, 8, 9 
Octoaon degus* 203.0 193.0   22.6 2.84 10, 11, 12 
Thomomys talpoides 300.0 106.8   19.6 2.37 13, 14, 15 
Mass (g)
NCOTb
MR (ml O2 min−1)
BurrowingBasal(kJ m−1)(J g−0.67 m−1)BurrowingBasalReference
Heterocephalus glaber 31.5 32.0 2.3 230 1.76 0.34 1, 2, 3 
Notomys alexis* 33.0 33.0 7.1 684 3.70 0.67 This study 
Georychus capensis 113.0 195.0 1.8 76 6.42 1.93 4, 5 
Thomomys bottae 150.0 143.0 6.4 224 10.3 2.00 
Cryptomys damarensis 152.1 138.0 2.0 68 7.68 1.31 3, 7, 8, 9 
Octoaon degus* 203.0 193.0   22.6 2.84 10, 11, 12 
Thomomys talpoides 300.0 106.8   19.6 2.37 13, 14, 15 

NCOTb, net cost of transport by burrowing; MR, metabolic rate.

All digging measurements were obtained in damp sand or sandy loam. NCOTb data are presented as whole animal measurements (J m−1) and normalised to burrow cross-sectional area(∞Mb2/3)(Vleck, 1979).

References: 1 (McNab,1966); 2 (Withers and Jarvis,1980); 3 (Lovegrove,1989); 4 (Du Toit et al.,1985); 5 (Lovegrove,1987); 6 (Vleck,1979); 7 (Lovegrove,1986); 8 (Lovegrove,1988); 9 (Bennett et al.,1992); 10 (Bozinovic and Novoa,1997); 11 (Ebensperger and Bozinovic, 2000); 12 (Arends and McNab, 2001); 13 (Bradley et al., 1974); 14 (Gettinger,1975); 15 (Andersen and Macmahon, 1981).

*

Species are semi-fossorial, the remainder are fossorial.

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