Sequential mobilization of marrow fat in the Impala (Aepyceros melampus) and analysis of condition of Wild dog (Lycaon pictus) prey

Abstract

Mobilization of bone marrow fat in the fore and hindlimbs of the Impala (Aepycevos melampus) was shown to be sequential in nature, with proximal bones showing distinct fat loss before medial and distal bones were mobilized. There are indications that medial bone marrow fat is mobilized at a greater rate than that of the distal bone in both the fore and hindlimbs, thus indicating sequential mobilization proceeding distally from the proximal bone. Further evidence suggests that bones in the hindlimb are mobilizing fat at a faster rate than comparable bones in the forelimb. The degree of marrow fat loss shows that Wild dogs (Lycaon pictus) in the Kruger National Park, South Africa are preying on Impala which exhibit both high and low marrow fat values, thereby indicating predation on both sick and relatively healthy animals. The presence of relatively healthy animals in the Wild dog diet is seen as a direct result of the high density of cover and consequent low visibility in the Kruger National Park.