Study on species diversity and community structure of pitcher plants (Nepenthes) at Sungai Merah, Sibu, Sarawak


 

THE SARAWAK MUSEUM JOURNAL
Vol. LXI No. 82 DECEMBER 2005
 
 
Title : 
A Study on Species Diversity and Community Structure of Pitcher Plants (Nepenthes) at Sungai Merah, Sibu, Sarawak.
Author : 
Jumaat H. Adam and Alex Kong Siew Ping
Abstract:
A study on species diversity and community structure of Nepenthes at Sungai Merah has identified the occurrence of Nepenthes gracilis, N. rafflesiana and N. ampullaria in 0.25 hectare study plot. They can be differentiated from each other by the differences in the morphological characteristic of leaves, stem, pitcher, honey glands and digestive glands. Nepenthes gracilis have angular stem and sessile leaves whereas the other species have rounded stem and stalked leaves. Matured populations of N. gracilis and N. rafflesiana have a very strong tendency to grow on the fringe of the secondary bush; and these two species comprising of 236 and 106 matured plants outnumbered the N. ampullaria and N. mirabilis with 57 and 34 plants respectively. The domination of N. gracilis and N. rafflesiana was contributed by the dry and exposed condition of the plot. Age structure of N. gracilis was highly represented by matured plants, saplings and seedling with the ratio of 98:62:76; followed by N. rafflesiana with the ratio of 65:25:16; the representation of N. ampullaria and N. mirabilis was comparably low with the other two species with the ratio of 18:17:16 and 16:12:6 respectively. The populations of all the species and their life stages have a very strong tendency to grow in aggregation. The Id >1 of all the species and the X2 analysis showed that their dispersion population pattern were significantly contagious. The analysis of Contingency Table and the X2 showed no significant increase of pitcher productions with stem size increment in N. gracilis and N. rafflesiana.
DOI:
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How to cite:
Jumaat H. Adam and Alex Kong Siew Ping. (2005). A Study on Species Diversity and Community Structure of Pitcher Plants (Nepenthes) at Sungai Merah, Sibu, Sarawak. The Sarawak Museum Journal, LXI (82): 297-319
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