The Distribution of C and C Grasses and Carbon Isotope Discrimination Along an Altitudinal and Moisture Gradient in Kenya

More than 500 species of the Poaceae are found in Kenya, East Africa. Eighteen of twenty-seven tribes are exclusively (except the Paniceae and Danthonieae) of the C photosynthetic type. A floristic analysis of low altitude grasslands suggests that nearly all species at these low altitudes are of the C photosynthetic type. At high altitudes, however, nearly all grasses are of the C photosynthetic type. Open grassland vegetation was sampled along a transect from arid low altitude sites to the top of Mt. Kenya in an attempt to document the general distributions of the photosynthetic types.The major tribes illustrated three general patterns of distribution. The C tribes Chlorideae, Eragrosteae, Sporoboleae, and Aristideae were abundant at low altitudes (or low indices of available soil moisture). The Paniceae and Andropogoneae were also exclusively C but were more common at intermediate altitudes. The C tribes Aveneae, Festuceae, and Agrostideae were found only at high altitudes. In these open grasslands there were no C species below 2,000 m and no C species above 3,000 m. The variation in δC of the live grass vegetation with altitude confirms these distributional patterns and suggests a sharp transition zone between these two photosynthetic types. The photosynthetic type accounts for broad distributions within the Poaceae but these distributions are further modified by characteristics which may be inherent in the tribal groups. Ecological and paleoecological significance of these patterns of distribution are discussed.