Heart rate and estimates of rates of oxygen consumption and mass-specific field metabolic rate determined from these heart rates for birds ashore and while at sea
| Activity . | fh (beats min-1) . | V̇O2est (ml O2 min-1) . | FMRest (W kg-1) . |
|---|---|---|---|
| FMR ashore | 87.2±4.3 | 122.1 (—28.2, +36.0)a,b,c,d,e | 3.15 (—0.71, +0.93) |
| Diving bout | 123.5±3.1 | 216.6 (—11.9, +12.7)a,f | 5.44 (—0.30, +0.32) |
| First hour after bout | 168.7±10.2 | 330.1 (—17.2, +18.0)b,f,g,h,i | 8.29 (—0.43, +0.45) |
| Rest of the interbout | 136.7±8.8 | 248.5 (—12.9, +13.6)c,g | 6.24 (—0.32, +0.34) |
| Total interbout | 141.6±8.8 | 260.6 (—14.5, +15.4)d,h | 6.54 (—0.36, +0.39) |
| FMR at sea | 130.8±5.1 | 234.1 (—15.1, +16.1)e,i | 5.77 (—0.37, +0.40) |
| Activity . | fh (beats min-1) . | V̇O2est (ml O2 min-1) . | FMRest (W kg-1) . |
|---|---|---|---|
| FMR ashore | 87.2±4.3 | 122.1 (—28.2, +36.0)a,b,c,d,e | 3.15 (—0.71, +0.93) |
| Diving bout | 123.5±3.1 | 216.6 (—11.9, +12.7)a,f | 5.44 (—0.30, +0.32) |
| First hour after bout | 168.7±10.2 | 330.1 (—17.2, +18.0)b,f,g,h,i | 8.29 (—0.43, +0.45) |
| Rest of the interbout | 136.7±8.8 | 248.5 (—12.9, +13.6)c,g | 6.24 (—0.32, +0.34) |
| Total interbout | 141.6±8.8 | 260.6 (—14.5, +15.4)d,h | 6.54 (—0.36, +0.39) |
| FMR at sea | 130.8±5.1 | 234.1 (—15.1, +16.1)e,i | 5.77 (—0.37, +0.40) |
fh, heart rate; V̇O2est, estimated rate of oxygen consumption; FMRest, estimated mass-specific field metabolic rate.
V̇O2est and FMRest were determined from the fH values using equation 1[log(V̇O2)=—0.279+1.24log(fh)+0.0237n—0.0157log(fh)n,r2=0.81], where n=number of days fasting, or equation 2A[log(V̇O2)=1.35log(fh)—0.488, r2=0.86] from Fahlman et al.(2004), for birds ashore and while at sea, respectively.
Values are means ± s.e.m.,N=8 or 10 (see Table 2). Values in parentheses are the computed s.e.e.
Superscripted letters signify significant differences between estimates for specific activities (P<0.05, Z-test).