Population density and age structure of Nepenthes gracilis, Nepenthes ampullaria, Nepenthes rafflesiana and Nepenthes hookeriana

A study of population density and age structure of Nepenthes gracilis, N. ampullaria, N. rajjlesiana and N. hookeriana was carried out in 0.1 ha plot at 150 m, 500 m, 550 m and 600 m altitude along the slope from the foothill to the summit of Gunung Pulai, Johor. Age structures of all four species studied were dominated by matured plants with 276 individuals, followed by 128 saplings and 88 of seedlings. Meanwhile, estimated density of Nepenthes species in 0.1 hectares plot was shown to differ in different altitudes. Highest estimated density recorded by N. ampullaria with 660/ha, followed by N. rafflesiana with 420/ha, then distantly followed by N. gracilis and N. hookeriana were respectively 80/ha and 70/ha