Malays. Appl. Biol. (December 2002) 31(2): 71-77
DIVERSITY, ABUNDANCE AND SPECIES SIMILARITY OF BRACONID WASPS IN LOGGED AND FRAGMENTED FORESTS
IDRIS, A.B.*, HASMAWATI, Z., NOR-ZANEEDARWARTY, N. and NUR-AZURA, A.
School of Environmental and Natural Resource Sciences, Faculty of Science & Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
ABSTRACT
A study was conducted to investigate the difference in diversity, population abundance and species similarity of braconid wasps in three logged and fragmented forests in the Langat Basin in Selangor, Malaysia. Sampling was done for one week per month from July to November 2001 using nine Malaise traps per forest. Traps were placed at 5m, 250m and 500m along a transect (three transects per forest) from the edge to 500 m into the forest. A total of 953 Braconids comprising 19 subfamilies and 91 species (morphospecies) were collected. Of the 953 individuals, 195 individuals were collected at HSUKM (UKM Forest Reserve), 344 at HSKLS (Southern Kuala Langat Forest Reserve) and 414 al HSKLU (Northern Kuala Langat Forest Reserve). The Microgastrinae, Gnampthodontinae and Rogadinae were the mosl abundant having 427, 133 and 98 individuals respectively. The Shannon-Weiner Diversity Index (H') indicated thai HSUKM had a significantly higher H' value (3.27) than that of HSKLU (2.37) and HSKLS (2.76). Braconid diversity in the forests was not significantly different (P > 0.05) from forest's edge to 500 m into the interior. There was 42.3% species similarity between HSUKM and HSKLS, 42.9% between HSUKM and HSKLS, and 52.9% between HSKLU and HSKLS.
ABSTRAK
Kajian terhadap perbezaan kepelbagaian, kelimpahan populasi dan spesies sepunya (sama) tebuan braconid telah dijalankan di tiga hutan simpan di Lembangan Langat, Selangor, Malaysia yang telah dibalak dan dan terpencil. Persampelan telah dijalankan selama seminggu setiap bulan dari bulan Julai hingga November 2001 menggunakan sembilan perangkap Malaise bagi setiap hutan. Perangkap telah dipasang pada jarak 5 m, 250 m dan 500 m di sepanjang setiap tiga laluan transeks yang dibina daripada pingir ke 500 m ke dalam hutan. Sejumlah 953 braconid yang terdiri daripada 19 subfamili dan 91 spesies (morfospecies) telah berjaya dikumpul dan direkod. Daripada 953 individu braconid, 195 individu terkumpul daripada HSUKM (Hutan Simpan UKM), 344 individu daripada HSKLS (Hutan Simpan Kuala Langat Selatan) dan 414 individu daripada HSKLU (Hutan Simpan Kuala Langat Utara). Jumlah individu subfamili Microgastrinae, Gnampthodontinae and Roganidae dikumpul daripada semua hutan adalah paling banyak iaitu masing-masingnya 427, 133 dan 98. Nilai Indek Kepelbagaian Shannon-Weiner (H') yang didapati menunjukkan bahawa HSUKM mempunyai tahap kepelbagain braconid paling tinggi (H' = 3.27) dan signifikan berbanding nilai H' untuk HSKLU (2.37) dan HSKLS (2.76). Kepelbagaian braconid pada jarak berbeza dari pingir hingga 500 m ke dalam hutan didapati tidak menunjukkan perbezaan yang bererti (P > 0.05) bagi ketiga-tiga hutan yang dikaji. Didapati bahawa kesamaan spesies (pertindihan species) ialah 42.3% di antara HSUKM dengan HSKLS, 42.9% di antara HSUKM dengan HSKLS, dan 52.9% di antara HSKLU dengan HSKLS.
Key words: Braconid, Diversity, Population Abundance, Species Similarity, Fragmented Forests
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