Grasshopper diversity in several agricultural areas and savannas in Dompu, Sumbawa Island, Indonesia

Abstract

Abstract. Leksono AS, Yanuwiadi B, Khotimah A, Zairina A. 2021. Grasshopper diversity in several agricultural areas and savannas in Dompu, Sumbawa Island, Indonesia. Biodiversitas 23: 75-80. In Sumbawa Island, the conversion of forests and savannahs into agricultural land has increased rapidly since 2010. This research aims to compare grasshopper species' abundance, richness, and diversity between several farmland and savannas in Dompu, Sumbawa Island. It was conducted at ten locations in Dompu, Sumbawa Island, and included an ecotone, two post-harvested rice farms, two post-harvested corn farms, a mixed farm, a vegetable farm, and three savannas. Furthermore, samples were taken four times from four plots at each location in the post-harvest period from August to September 2021. Grasshopper sampling was carried out using the sweeping method with an insect net with each plot size of 2 x 10 m2. A total of 2264 individual grasshoppers belonging to 30 species and four families were collected from all research sites. The dominant species were Alloteratura sp., Trilophidia annulata, Atractomorpha crenulata, Phlaeoba fumosa, Oxya japonica and, Phlaeoba infumata. The greatest grasshopper species richness and diversity were found in post-harvest rice farms, while the lowest was in the vegetable farm, and most of these species are considered pests. This research shows that the composition of grasshoppers on agricultural land is very similar to that of the adjacent savannah. Hence, monitoring and controlling their presence is necessary by paying attention to savannas as refuge land.

Diversity of grasshopper in Lingsar Vegetable Field, West Lombok

“…The grasshopper diversity index (H') was 1.5445 (Table 2). This index is higher than H' in the vegetable farming area in the Dompu area, Sumbawa island, by 1.25 (Leksono et al, 2022), forest ecosystems (0.6307), and maize agroecosystems (0.5335) in Karanggayam District, Kebumen [17], and only slightly different from the diversity of grasshoppers in the three forests in Surabaya, namely 1.53 [18]. The diversity of grasshopper species was positively influenced by plant diversity, but the relationship was sometimes inconsistent [4].…”

“…species [14]. However, the number of this species is much lower [15], who studied the diversity of grasshoppers in several agricultural areas including ecoton areas, postharvest rice farming, post-harvest maize farming, mixed farming, vegetable farming and savanna, which is as much as 26 species belonging to 4 families.…”

Species checklist of Orthoptera in the Forest Area with Special Purpose (KHDTK) Aek Nauli, North Sumatra

“…Oxya intricata was also documented from a study in two sites i.e corn field and forest ecosystem of Banyumas Regency, Central Java, Indonesia [13]. The difference in the number of species richness, abundance and diversity across region may due to the limited number of sampling efforts, time of sampling, type of microhabitats, and sampling techniques [14]. To discover a greater variety of orthopteran species in the forest ecosystems, several authors proposed doing an extensive investigation in diverse microhabitats and the forest canopy [15].…”

Orthoptera (Insecta) fauna of the Kashkadarya region, Uzbekistan

“…It should be noted that the research results were published in many local journals and discussed at conferences but not fully announced abroad. Similar scientific works were carried out in Indonesia and Kazakhstan (Leksono et al 2020;Temreshev and Makezhanov 2020;Leksono et al 2021). Gapparov (2014) studied the species composition of Orthopterans in the Karshi steppe and the role of destructive species of Acrididae.…”