Immediate Effects of Selective Logging on Understorey Birds in Ulu Muda Forest Reserve, Kedah, Malaysia
This study was carried out to determine understorey bird species composition before and immediately (less then one year) after logging. The main objectives were to determine: (i) the trophic structure related to the feeding guild, (ii) the diversity in terms of species diversity, species richness...
Saved in:
| Main Author: | |
|---|---|
| Format: | Thesis |
| Language: | English English |
| Published: |
2001
|
| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/10037/1/FH_2001_2_IR.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | This study was carried out to determine understorey bird species composition
before and immediately (less then one year) after logging. The main
objectives were to determine: (i) the trophic structure related to the feeding
guild, (ii) the diversity in terms of species diversity, species richness and
species evenness) and (ii) to generate a species list for understorey bird
population before and immediately after logging. The study was conducted in
compartment 28/29, Ulu Muda Forest Reserve, Kedah, Malaysia. This area is
a hill forest covering an area of 791.2 ha. It was harvested using selective
logging method in 1997 and harvesting was completed at the end of 1999.
Mist-netting method was used to obtain the information on understorey bird
species. A total of 75 species with 175 individuals were recorded before
logging and 61 species with 385 individuals were recorded immediately after
logging. The Babblers group decreased immediately after logging. However,
the bulbuls and spiderhunters increased immediately after logging.
The Insectivore group was found to dominate the forest before logging
followed by insectivore/frugivore and frugivore groups. However, the
insectivore/frugivore group dominated the area immediately after logging,
followed by insectivore and nectarivore/insectivorel frugivore groups. The
analysis of feeding guild also showed that the arboreal foliage gleaning
insectivore guild dominated the primary forest in terms of species
composition and number of individuals, but their numbers decreased
immediately after logging. The arboreal foliage gleaning insectivore/frugivore
was found to be higher in terms of the number of species and individuals
immediately after logging.
The values of species diversity index (H'), species richness index (R) and
species evenness index (E) were also significantly higher before logging
compared with the values immediately after logging.
The changes in forest vegetation and microclimate were the main factors
which affected the composition and diversity of understorey bird species.
Thus, logging has changed the composition, the trophic and feeding guild
structures as well as the diversity of understorey bird species. |
|---|