Interactions among Diversity of Arthropods in Areas with Mahogany in East Java, Indonesia

Abstract

Purwodadi Botanical Garden has several subareas of invasive exotic species, such as Swietania macrophylla. This species reduces endemic species and disturbs the biodiversity integrity of an ecosystem, including arthropods. This study tries to identify any interaction between the diversity of arthropods and the invasive species of S. macrophylla. The observed areas were VII C, VII E, and VIII A. The methods included measuring physical and chemical factors and procuring samples of arthropods through pitfall trap and yellow pan trap. The data analysis included Important Value Index, Shannon-Wiener diversity index, evenness index, richness index and dominance index. Analysis of Bray-Curtis similarity index using PAST was also carried out to identify the similarity of the three areas. The pitfall trap obtained 78 individuals from 7 taxa, and the yellow pan obtained 61 individuals from 8 taxa. Formicidae has the highest Important Value Index, and it is the most dominating. The Shannon-Wiener diversity index on the three subareas is even around 1, 5 to 1, 9, and the ecosystem is quite good. The Bray-Curtis indices in subarea VIII A and VII C concluded acidity of above 75%. The diversity of arthropods can be affected by the vegetation above them and the green matter, soil organic matter and soil moisture.