›› 2011, Vol. 54 ›› Issue (7): 778-785.doi:

• RESEARCH PAPERS • Previous Articles     Next Articles

Dynamics and simulation modeling of the content of metal elements in Sogatella furcifera Horváth (Homoptera, Delphacidae)

SHI Song, TANG Qi-Yi, FU Qiang, PENG Qi, CHENG Jia-An   

  • Received:2010-12-29 Online:2011-07-20 Published:2011-07-20
  • About author:shisong1986@gmail.com

Abstract: To determine the distribution and dynamic excretion of metal elements, the test insects, adults of the Sogatella furcifera (Horváth) were subjected to feeding on deionized water for 0 h, 24 h, 48 h, and 96 h, respectively. The body weight changes were measured and the contents of twelve metal elements (Cu, Zn, Cd, Mn, Ca, Fe, Na, As, U, Mg, K and Pb) in S. furcifera were detected using ICP-MS technique. At the same time, we denote the entire body weight, the organic tissue weight, the weight of the intestinal contents and their excretion rate of S. furcifera by W, O, E and r, respectively. The body weight of S. furcifera at different time can be expressed by the modified exponent equation Wt=O+E(1-r)t . Considering the content of a certain element in S. furcifera (WCt )  should be the sum of the content of that element in the organic tissues (OC) and in the intestinal contents (EC), the statistical model is WCt=OC·OPt+EC·EPt, where OPt is the percentage of O to body weight at time t and EPt is the percentage of E. The results of simulation modeling showed that the contents of Cu, Zn, Cd, Mn and Ca are significantly higher in the organic tissues than those in the intestinal contents (P<0.05), suggesting that these elements can be absorbed or accumulated by organic tissues. The contents of seven elements (Fe, Na, As, U, Mg, K and Pb) have no significant difference between in the organic tissues and in the intestinal contents (P>0.05), suggesting that the contents of these elements in the organic tissues are balanced with those in the intestinal contents and their contents in insect body are not significantly changed. The simulation modeling method can provide reference to other studies involving metal distribution, accumulation and excretion in other small or micro-insects.

Key words: Sogatella furcifera, metal element content, bio-accumulation effect, simulation modelling