Sex Determination of 3<sup>rd</sup>-instar Larva of Japanese Rhinoceros Beetle Based on Their Droppings Using Mahalanobis-Taguchi System

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  • マハラノビス－タグチ（MT）法を用いたカブトムシ三齢幼虫糞形状による雌雄判別

Abstract

<p>The Mahalanobis-Taguchi system (MTS) is one of the multi-variate analyses which can classify data by correlations among multi-variables. The MTS has significant advantage of applying a cause analysis which provides effective variable combinations to upgrade the accuracy of the classification. In this study, droppings, which were extruded from Japanese rhinoceros beetle larva were selected to classify into male/female based on their shape-related features using the MTS. Based on the cause analysis, the projected area/Feret’s diameter (A/F) and solidity were the best variable combination which all the larval droppings were classified into male/female. Both the variable has surface roughness-related factors with size effect (A/F) without size effect (solidity). The MTS has the great ability to classify from the powders’ minor difference and will be an effective tool for particle design in the near future.</p>

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