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International Journal of Tropical Insect Science

, Volume 5, Issue 6, pp 527–531 | Cite as

Diurnal Variation in Feeding and Gut Activity in Nymphs of the African Pest Grasshopper, Zonocerus Variegatus

  • W. W. D. Modder
Research Article

Abstract

An analysis of the variation of fore-, mid- and hindgut contents in third- to sixth-instar nymphs of the African grasshopper, Zonocerus variegatus, freshly caught every hour in the field, and also left without food for 1, 6 and 12 hr, showed that gut motility and the movement of ingesta through the gut was maximal at 08.00-10.00, 13.00–14.00 and 16.00 hr. Movement of ingesta was very slow at night. A diurnal rhythm therefore governs gut emptying. Nymphs, confined in jars with leaf discs, fed from 07.00 to 19.00 hr over the temperature range 17–34°C. Most food was eaten after 13.00 hr when it is warmer. Field insects feed during the night as well. Midgut α- and -glucosidase activity was detected at all times of testing (06.00, 12.00, 19.00 and 24.00 hr), but the levels of activity were lowest at 12.00 and 19.00 hr.

Key Words

Diurnal variation feeding gut emptying gut motility midgut α- and β-glucosidases Zonocerus variegatus 

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References

  1. Bernays E. A. and Chapman R. F. (1972) Meal size in nymphs of Locusta migratoria. Entomologia exp. appl. 15, 399–410.CrossRefGoogle Scholar
  2. Bernays E. A. and Chapman R. F. (1973) The role of food plants in the survival and development of Chortoicetes terminifera (Walker) under drought conditions. Aust. J. Zool. 21, 575–592.CrossRefGoogle Scholar
  3. Chapman R. F. (1957) Observations on the feeding of adults of the Red Locust (Nomadacris septemfasciata (Serville)). Br. J. Anim. Behav. 5, 60–75.CrossRefGoogle Scholar
  4. Haslewood G. A. D. and Strookman T. A. (1939) A method for the estimation of “true” sugar in 0.05 ml of blood. Biochem. J. 33, 920–923.CrossRefGoogle Scholar
  5. Kaufmann T. (1965) Observations on aggregation, mi-gration, and feeding habits of Zonocerus variegatus in Ghana (Orthoptera: Acrididae). Ann. ent. Soc. Am. 58, 426–436.CrossRefGoogle Scholar
  6. Modder W. W. D. (1977) Changes in somatic tissues in the penultimate instar of the African grasshopper, Zonocerus variegatus (L.) (Acridoidea: Pyrgomorphidae). Acrida 6, 19–32.Google Scholar
  7. Nowosielski J. W. and Patton R. L. (1964) Daily fluctuations in the blood sugar concentration of the house cricket, Gryllus domesticus L. Science, Wash. 144, 180–181.CrossRefGoogle Scholar
  8. Okere A. N. (1980) Studies on the biology of Zonocerus variegatus L. (Orthoptera, Acridoidea). Ph.D. Thesis, University of Ibadan, Nigeria.Google Scholar

Copyright information

© ICIPE 1984

Authors and Affiliations

  • W. W. D. Modder
    • 1
  1. 1.Department of ZoologyUniversity of IbadanIbadanNigeria

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