. Ecological investigations of the tundra biome in the Prudhoe Bay region, Alaska . 20 40 60 Live Biomass (g DM 100 m-=) Fig. 10. Relationship between rate of eating, as estimated by collection of esophageal egesta, and available live biomass (a). Forage samples were collected over a 10 min period following 3-4 hr fasting. Theoretical relationships between percentage of day spent eating and availability of live biomass (b). The general relationship was adapted from data for grazing sheep (—, Young and Corbett, 1972). V///A, average available live biomass at Prudhoe Bay in July (see Fig. 9). Un
. Ecological investigations of the tundra biome in the Prudhoe Bay region, Alaska . 20 40 60 Live Biomass (g DM 100 m-=) Fig. 10. Relationship between rate of eating, as estimated by collection of esophageal egesta, and available live biomass (a). Forage samples were collected over a 10 min period following 3-4 hr fasting. Theoretical relationships between percentage of day spent eating and availability of live biomass (b). The general relationship was adapted from data for grazing sheep (—, Young and Corbett, 1972). V///A, average available live biomass at Prudhoe Bay in July (see Fig. 9). Unfortunately, we have no comparable detailed estimates for adult males. However, we have estimates of the grazing intensities of these cohorts (Table 14) which show that lactating caribou graze more intensively than non-lactat- ing female caribou and caribou bulls. If it is assumed that all cohorts spend the same propor- tion of the day grazing (where grazing time = eating time + searching time), then estimates can be made of the relative amount of time spent eating (Table 14). This may be an oversimplifica- tion of grazing behavior under natural condi- tions, for it is known that the amount of time ruminants spend grazing decreases exponentially with increasing available biomass (Young and Corbett 1972). Since we were unable to deter- mine this parameter, the general form of a relationship between grazing time and biomass
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