Journal of Environmental Biology

Effect of salinity on the predatory performance of Diplonychus rusticus (Fabricius)

G. Chandramohan, S. Arivoli* and P. Venkatesan

Aquatic Entomology and Biocontrol Research Laboratory, Department of Advanced Zoology and Biotechnology,

Loyola College, Chennai-600 034, India

(Received: August 12, 2005 ; Revised received: June 28, 2006 ; Re-revised received: July 12, 2006 ; Accepted: August 16, 2006)

Abstract: Predatory efficiency of Diplonychus rusticus (Fabricius) was recorded at different prey density with different salinity ranges.  When the salinity level (ppt) was increased, the predation rate of the bug decreased. Fifth nymphal stage showed higher predation in the 2, 4 and 6 ppt levels of salinity in both 1hr and 24 hr period of exposure at prey densities 50, 100, 150 and 200.  At prey density 150, adult bugs killed more prey in the 2 ppt level of salinity in both 1hr and 24 hr  treatments. 

Key words:   Salinity, Predatory performance, Diplonychus rusticus

 

PDF of full length paper is available with author (rmsarivoli@yahoo.com)

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