Rice is Indonesian staple food. Its production depends on the biotic and a-biotic factors. In the biotic factor, arthropods are important component that is always a special concern in doing the cultivation1. As one of the biggest ecosystems in the tropics, rice fields include diverse insect pests and natural enemies. There were several reports related to spatial and temporal distributions of arthropods in agro-ecosystems, storages and landscapes2.
The distribution of arthropods in a habitat is influenced by numerous factors. On ep fthem is refugium/refugia. Generally a refugium is a location which supports an isolated or relict population of a once more widespread species. This isolation can be due to climatic changes, geography, or human activities such as deforestation and overhunting.
In rice agro-ecosystems, predatory arthropods are dominated by two families of Insecta and Arachnida such as; Carabidae and Staphylinidae for Insecta and Theridiidae and Lycosidae for Arachnida dominated in rice agro-ecosystem3.
Related to the refugia and distribution of arthropods on rice agro-ecosystem, it’s important to confirm the relationship between both to manipulate the habitat of natural enemies on rice agro-ecosystem. The spatial and temporal distributions will be the most important variables to determine the distribution of arthropods on rice ecosystem.
So a new study was carried on this very aspect to determine the effect of refugia on the spatial and temporal distribution of arthropods on rice fields4. Several observation methods such as; visual methods, pit-fall and yellow sticky traps were performed for this purpose. Observation of spatial distribution was divided into 6 points with 3 replications4.
The observation of temporal distribution was done at four periods: Vegetative I, vegetative II, generative I (reproduction) and generative II (ripening) with 18 points of observation in total.
Based on arthropod’s diversity, result showed that there are 13 orders consisting of 49 families and 82 species of arthropods found in the field. Arthropods obtained were derived from direct observation by visual method, yellow pan traps and pitfall trap.
Based on the functional role of arthropods in agro-ecosystems, population of arthropods was grouped into detritivore, herbivore, parasitoid, predator and pollinator. The observation data of temporal distribution obtains the number of arthropod as 318 heads in vegetative I, 695 heads in vegetative II, 528 heads in generative I and 592 heads in generative I.
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11 December, 2018