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Tolerance of acridids to ingested condensed tannin
E A Bernays1, D J Chamberlain, E M Leather
1Centre for Overseas Pest Research, College House, Wrights Lane, W8 5SJ, Kensington, London, England.
Journal of Chemical Ecology
|January 15, 2014
Summary
Grasshoppers (Acridoidea) can tolerate condensed tannins in their diet up to 10% dry weight without harm. Higher tannin levels reduce food consumption and utilization, but digestibility remains largely unaffected.
Area of Science:
- Entomology
- Plant-insect interactions
- Chemical ecology
Background:
- Condensed tannins are plant secondary compounds that can deter insect herbivory.
- Acridoidea (grasshoppers) are important agricultural pests, and understanding their dietary tolerance is crucial for pest management.
Purpose of the Study:
- To investigate the effects of condensed tannin (quebracho) on the survival, growth, and food utilization of four Acridoidea species.
- To determine the tolerance thresholds of these insects to dietary condensed tannin.
Main Methods:
- Four species of Acridoidea were reared on wheat leaves treated with varying concentrations of quebracho tannin.
- Survival, growth, food consumption, digestibility, and efficiency of conversion of digested food were measured.
Main Results:
- Survival and growth were not affected at tannin concentrations below 10% dry weight.
- Food consumption, digestibility, and utilization were unaffected up to 10% dry weight.
- Higher tannin concentrations (above 10%) reduced food consumption and efficiency of conversion, but digestibility was minimally impacted.
Conclusions:
- Acridoidea species exhibit a notable tolerance to condensed tannins up to 10% of their diet.
- The findings suggest Acridoidea possess mechanisms to cope with moderate levels of dietary tannins, unlike more sensitive insect groups.
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