. Proceedings of the Symposium on Management of Forest and Range Habitats for Nongame Birds, May 6-9, 1975, Tucson, Arizona. Birds Conservation Congresses; Birds Habitat Congresses; Range management Congresses; Wildlife habitat improvement Congresses. lOOr processed roughly 17 percent more energy ( kcal m season ). Avian community energy demand was considerably higher in the transitional stand (3), rougly twice that of the low-elevation communities. The mesic floodplain stand (Delta) populations had a collective seasonal energy demand of kcal m , considerably greater than other
. Proceedings of the Symposium on Management of Forest and Range Habitats for Nongame Birds, May 6-9, 1975, Tucson, Arizona. Birds Conservation Congresses; Birds Habitat Congresses; Range management Congresses; Wildlife habitat improvement Congresses. lOOr processed roughly 17 percent more energy ( kcal m season ). Avian community energy demand was considerably higher in the transitional stand (3), rougly twice that of the low-elevation communities. The mesic floodplain stand (Delta) populations had a collective seasonal energy demand of kcal m , considerably greater than other stands supporting the same number of breeding species in more xeric locations. Over the range of stands, approximately 1 percent of the seasonal energy flow was channelled into production, while reproduction-related processes accounted for 15-16 percent of the total energy intake. Thermoregulatioa required 13-19 percent of the seasonal total, with the higher relative costs associated with the cooler, higher elevation stands. In some respects, peak daily energy consump- tion may be more important than total seasonal energy consumption, since large daily peaks presumably have more significant effects upon prey populations. The simulation model estimates energy demands on a daily basis, and the analysis of these six Oregon stands indicated well-defined peaks of community energy demand at all sites. Peak dajly energy demands varied from kcal m day , with the highest values record- ed in stands 3 and Delta. These patterns of energy flow are of theoretical interest, but of greater immediate importance are the ways in which energy flow is expressed in consumption of prey organisms. The model estimates of energy demands may be convert- ed to estimates of food consumption rates by combining information on the dietary habits of the bird populations with information on the caloric values of various prey taxa. Detailed information on food habits was not available for many of the
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