KEANEKARAGAMAN LABA-LABA (Arachnida : Araneae) PADA EKOSISTEM PADI ORGANIK DAN KONVENSIONAL DI KABUPATEN PADANG PARIAMAN

WELLI, SURIANI (2018) KEANEKARAGAMAN LABA-LABA (Arachnida : Araneae) PADA EKOSISTEM PADI ORGANIK DAN KONVENSIONAL DI KABUPATEN PADANG PARIAMAN. Diploma thesis, UNIVERSITAS ANDALAS.

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Abstract

KEANEKARAGAMAN LABA-LABA (Arachnida : Araneae) PADA EKOSISTEM PADI ORGANIK DAN KONVENSIONAL DI KABUPATEN PADANG PARIAMAN ABSTRAK Laba-laba merupakan musuh alami penting dalam menekan populasi hama pada tanaman padi. Perbedaan sistem budidaya mempengaruhi populasi dan tingkat keanekaragaman spesies laba-laba. Penelitian ini bertujuan untuk mempelajari keanekaragaman laba-laba pada ekosistem padi organik dan konvensional di Kabupaten Padang Pariaman. Metode pengambilan sampel menggunakan jaring ayun (Sweep Net) dan perangkap jebak (Pitfall Trap). Sampel dikoleksi di Nagari Kasang dan Nagari Sungai Buluah. Data keanekaragaman, kemerataan dan dominansi spesies dianalisis menggunakan indeks Shannon-Wienner, Pielou, dan indeks nilai penting. Total laba-laba yang dikoleksi pada penelitian ini 1.766 individu yang terdiri atas 11 famili, 17 genus, 8 spesies dan 20 morfospesies. Keanekaragaman spesies pada ekosistem padi organik lebih tinggi dibandingkan padi konvensional yaitu berturut-turut 2,02 dan 1,74, sedangkan nilai kemerataan tertinggi terdapat pada ekosistem padi konvensional yaitu 0,70. Spesies laba-laba yang dominan di lokasi penelitian yaitu Tetragnathidae javana. Kata kunci : Keanekaragaman, Laba-laba, Padi, Organik   DIVERSITY OF SPIDERS (Arachnida : Araneae) IN ORGANIC AND CONVENTIONAL RICE FIELDS ECOSYSTEM IN PADANG PARIAMAN ABSTRACT Spiders are important natural enemies in suppressing pest populations in a rice field. Differences in cultivation systems affect the population and the extent of species diversity of spiders. This research aimed to study the diversity of spiders in organic and conventional rice filed ecosystems in Padang Pariaman Regency. The sampling method uses a sweep net and pitfall trap. Samples were collected in Nagari Kasang and Sungai Buluah. Data on species diversity, evenness and dominance were analyzed using the Shannon-Wiener, Pielou, and Important Value Indices. The total number of spiders collected in this study were 1766 individuals consisting of 11 families, 17 genera, 8 species and 20 morphospecies. Species diversity in organic rice field ecosystem is higher than conventional rice that is 2,02 and 1,74 respectively, while the highest evenness indices are in conventional rice ecosystem that is 0,70. The dominant spider species at the research site is Tetragnathidae javana. Keyword: Abundant, Spiders, Rice, Organic

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