Effect of Temperature on Development, Feeding and the Point of No Return of the Larvae of Parabotia fasciata
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    Abstract:

    Studies were conducted to examine the effects of temperature on larval and juvenile development, initial feeding timing, the group feeding rate and the point of no return (PNR) of the larvae of Parabotia fasciata during April to May, 2011. The results showed that the larval mouth opened 2 days after hatching and the group feeding rate peaked 1-2 days after the yolk sac exhaustion. The feeding intensity of the larvae of P. fasciata increased as the temperature rose. The time the larvae of P.fasciata reaching PNR shortened as the temperature rose, PNR appeared in 8.0-9.0 days after hatching at 22℃, in 7.0 d at 26℃, in 5.5 d at 28℃, and in 5.0 d at 30℃. The period between the feeding ratio reaching the peak and PNR is the starvation phase of no return. At 22℃, the starvation phase of no return lasted 3.5 days while that of 30℃ lasted 1.5 days. These results showed that the higher the temperature, the lower the larvae starvation endurance and the lower the survival rate. The study proves that temperature has a great effect on development, feeding and the point of no return of the larvae of P.fasciata. At different temperatures, proper feeding timing is of great importance to the survival of the larvae of P.fasciata.

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YANG Ming-Sheng, XIAO Han-Bing, ZENG Ling-Bing, LI Jian-Hua. 2012. Effect of Temperature on Development, Feeding and the Point of No Return of the Larvae of Parabotia fasciata. Chinese Journal of Zoology, 47(4): 114-120,129.

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History
  • Received:December 12,2011
  • Revised:February 25,2012
  • Adopted:
  • Online: August 16,2012
  • Published: