Preprint Article Version 1 This version is not peer-reviewed

Relative Abundance of Insect Predators Varies among Rice Plots as a Function of Surrounding Landscape

Version 1 : Received: 12 May 2018 / Approved: 14 May 2018 / Online: 14 May 2018 (10:13:50 CEST)

How to cite: ALI, M.P.; Kabir, M.M.M.; Haque, S.S..; Hashem, A.; Abd_Allah, E.F. Relative Abundance of Insect Predators Varies among Rice Plots as a Function of Surrounding Landscape. Preprints 2018, 2018050186 (doi: 10.20944/preprints201805.0186.v1). ALI, M.P.; Kabir, M.M.M.; Haque, S.S..; Hashem, A.; Abd_Allah, E.F. Relative Abundance of Insect Predators Varies among Rice Plots as a Function of Surrounding Landscape. Preprints 2018, 2018050186 (doi: 10.20944/preprints201805.0186.v1).

Abstract

Relationships among the population abundance of four predator groups for rice insect pests, namely: carabid beetles, staphylinid beetles, green mirid bugs, and spiders in three landscape categories were evaluated. Both rice plots and the associated bund margins of these rice plots found among three Bangladesh landscape categories were sampled by sweep net. The results revealed that the abundance significantly varied across landscapes. The rice landscape of one location harbored higher numbers of a specific predator than other location in other regions of Bangladesh. The results also showed a dependency on the width of the rice bund margins of the rice plots, where spiders populations increased with increased bund widths, but the population abundance of these predators did not depend on the diversity of the number of weed species found on the rice bund margins. The relative abundance of predator populations also significantly differed among the three landscapes, with the green mirid bug having the highest number among the four predators. This study indicates that predators of rice insect pests are highly landscape specific. In order to design integrated pest management systems for different Bangladeshi rice production locales, considerations unique to the characteristics of each locale are necessary. Preliminary efforts to apply variography analyses to the RED spectral band of LANDSAT 8 imagery from December 2016 are presented as first step toward learning a suite of methods which describe useful local characteristics affecting rice pest predators.

Subject Areas

rice landscape; natural enemies; location; population dynamics; variography; LANDSAT 8

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