Diversity Of Ephemeroptera, Plecoptera And Trichoptera (Ept) And Its Indication On Stream Quality At Oil Palm Plantation In Bau, Sarawak
This study was carried out to determine the species diversity of EPT at two rivers in Bau, Sarawak and subsequently assessed the stream quality by using taxa richness of the aquatic insects as the indicators. The two rivers namely Tongga River and Nolan River are located at north-western of the St...
Saved in:
| Main Author: | |
|---|---|
| Format: | Final Year Project Report |
| Language: | English |
| Published: |
Universiti Malaysia Sarawak, (UNIMAS)
2009
|
| Subjects: | |
| Online Access: | http://ir.unimas.my/id/eprint/34059/1/Kishen%20Bunya%20ft.pdf http://ir.unimas.my/id/eprint/34059/ |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | This study was carried out to determine the species diversity of EPT at two rivers in Bau, Sarawak and
subsequently assessed the stream quality by using taxa richness of the aquatic insects as the indicators. The
two rivers namely Tongga River and Nolan River are located at north-western of the State. Five stations were
established in each stream. In oil palm plantation stream, two sites were at downstream, one site within the
plantation area and two sites at upstream of the plantation area. In a pristine stream (i.e Tongga River), five
stations were studied as the control sites. A two-minute kick-sampling technique was employed in this study
and the sampling activities were made between September and October 2008. Environmental variables such
as pH, dissolved oxygen, water temperature, nitrate, ammonia, phosphate, total suspended solid, water depth,
wetted width and elevation were measured to assess their effects on community structure of EPT. The
relationships between the environmental variables and assemblage structure of EPT were analyzed with
redundancy analysis. In total, 30 species of EPT were recorded. Community structures of EPT were assessed
with ordination technique of redundancy analysis. Analysis showed that EPT were mainly influenced by
dissolved oxygen, pH, total suspended solid and depth. Statistically, species diversity between the two rivers
was not significant different indicate that effect of oil palm plantation on the overall EPT richness was not
present. However, several genera such as Campsoneuria sp., Cinygmula sp., Dolophilodes sp., Ecnomus sp.,
Epeorus sp., Neoperla sp., Phryganea Sp., Platybaetis sp., Polyplocia sp. 1., Polyplocia sp. 2.,
Thalerosphyrus sp., Tinodes sp., Thraulus sp. and Tricorythus sp. were sensitive to oil palm plantation thus
absent in Nolan River. Biologically, the EPT taxa richness showed that oil palm plantation stream as heavily
disturbed while Tongga River as severely disturbed. |
|---|