Malaysian Applied Biology Journal

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29-1&2-12

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Malays. Appl. Biol. (December 2000) 29(1&2): 95-100

DIVERSITY AND POPULATION ABUNDANCE OF ICHNEUMONIDS (HYMENOPTERA: ICHNEUMONIDAE) IN FIVE SELECTED DISTURBED HABITATS OF LANGAT BASIN, SELANGOR, MALAYSIA

IDRIS, A.B.

School of Environmental and Natural Resource Sciences, Faculty of Sciences & Technology. Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia

ABSTRACT

Studies on the diversity and population abundance of ichneumonid (Hymenoptera: Ichneumonidae) were conducted in five disturbed habitats of Langat Basin from July to November 1998. The five habitats were UKM-Permanent Forest Reserve (UKM-PFR) and bush areas (BA) around UKM campus in Bangi (Selangor), an orchard area (OCRD) of MARDI in Serdang (Selangor), and Rubber (RP) and Oil Palm (OPP) plantation of the New Labu Estate in Nilai (Negeri Sembilan). Results showed that BA had the highest numbers of ichneumonid subfamily and individuals per subfamily compared to other habitats. The UKM-PFR recorded the least number of ichneumonid subfamily (10) that-was lower than that of agriculture habitats (OPP, RP and ORD). The number of Cryptinae individuals was the most abundant in all habitats followed by Pimplinae and Ichneumoninae. There was strong and significant relationship between the number of individuals per subfamily collected and the subfamilies or types of habitat. The value of Shannon-Weiner diversity index (H') for ichneumonid subfamilies per habitat indicated that the diversity of ichneumonid subfamilies was also higher for BA, and significantly different (P < 0.05) to each of habitat studied. Results of this study indicate that better understanding on ichneumonid biology and ecological needs can improve their diversity and role in disturbed habitats of the Langat Basin. High diversity of these parasitoids is very important as they have potential to act as biological control agents on insect pests of important crops.


ABSTRAK

Kajian terhadap kepelbagaian dan kelimpahan serangga ichneumonid (Hymenoptera: Ichneumonidae) telah dijalankan di lima habitat terganggu di kawasan Lembangan Langat daripada Julai sehingga November 1998. Lima habitat tersebut ialah Hutan Simpan Kekal UKM (UKM-PFR), kawasan semak/belukar disekitar kampus UKM (BA) Bangi (Selangor), dusun buah-buahan (OCRD) MARDI di Serdang (Selangor), ladang getah (RP) dan kelapa sawit (OPP) di New Labu Estate Nilai (Negeri Sembilan). Keputusan menunjukkan iaitu BA mempunyai bilangan subfamily ichneumonid dan bilangan individual per subfamili berbanding dengan Iain-lain habitat yang dikaji. Didapati bahawa UKM-PFR merekodkan bilangan subfamili ichneumonid (10) lebih rendah daripada yang direkodkan oleh habitat-habitat pertanian (OPP, RP dan ORD). Bilangan individu daripada Cryptinae, Pimplinae dan Ichneumoninae adalah paling melimpah di kesemua habitat habitats. Terdapat perhubungan yang kuat dan signifikan di antara bilangan individu per subfamili dengan bilangan subfamili or jenis habitat. Nilai indeks kepelbagaian Shannon-Weiner (H') bagi subfamili ichneumonid per habitat menunjukkan bahawa BA mempunyai kepelbagaian subfamili ichneumonid yang tinggi dan signifikan (P < 0.05) berbanding dengan setiap habitat lain. Hasil kajian ini juga menunjukkan bahawa kefahaman tentang biologi dan keperluan ekologi serangga ichneumonidae adalah penting bagi memperkayakan atau meninggikan kepelbagaian serangga seperti serangga ichneumonid, yang kebanyakannya adalah berguna kepada kita, di kawasan Lembangan Langat. Ketinggian kepelbagaian serangga ichneumonid adalah penting kerana mereka mempunyai potensi untuk bertindak sebagai agen kawalan biologi serangga perosak tanaman.penting.

Key words: diversity, Ichneumonids, disturbed habitat, bioloeical control.

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