Table 1.
Mean values ± S.E. of mean for pochards and tufted ducks of diere duration and heart rate at spen. tima before, dun'ng and aftcr spatmreoru dives, feeding dives and idiced escape dives
Mean values ± S.E. of mean for pochards and tufted ducks of diere duration and heart rate at spen. tima before, dun'ng and aftcr spatmreoru dives, feeding dives and idiced escape dives