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Oecologia

, Volume 61, Issue 2, pp 201–207 | Cite as

Diet selection and digestion in Iguana iguana: the importance of age and nutrient requirements

  • Katherine Troyer
Original Papers

Summary

The green iguana, Iguana iguana, is herbivorous throughout life, and depends on a microbial fermentation system in the hindgut to degrade plant fiber. Because the metabolic rates of lizards are proportional to body mass raised to the 0.80 power, hatchling iguanas have 2X, and juveniles 1.4X, greater relative energy requirements (kJxg body mass-1xday-1) than full-grown adults. Growing animals also need a higher protein intake, for contruction of body tissues, than do mature animals. This study investigated how growing iguanas achieve a relatively greater nutrient intake than adults. Hatchling and juvenile iguanas do not have higher relative capacities of the digestive tract than mature iguanas, nor do they digest plant materials more effectively. Instead, growing iguanas select diets higher in digestible protein, and digest the same food 1.3X to 2X more rapidly, than adults. Young iguanas may accomplish their shorter food transit times by maintaining higher body temperatures.

Keywords

Fermentation Protein Intake Digestible Protein Microbial Fermentation Fermentation System 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Bennett AF, Dawson WR (1976) Metabolism. In: Gans C, Dawson WR (eds) Biology of the Reptilia, Volume 5 (Physiology A). Academic Press, New York, pp 127–223Google Scholar
  2. Bjorndal K (1979) Cellulose digestion and volatile fatty acid production in the green turtle, Chelonia mydas. Comp Biochem Physiol 63A:127–133Google Scholar
  3. Demment MW, Van Soest PJ (1982) Body size, digestive capacity and feeding strategies of herbivores. Winrock Research Publications, Morrilton, ArkansasGoogle Scholar
  4. Harlow HJ, Hillman SS, Hoffman N (1976) The effect of temperature on digestive efficiency in the lizard, Dipsosaurus dorsalis. J Comp Physiol 111:1–6Google Scholar
  5. Henderson RW (1974) Aspects of the ecology of the juvenile common iguana (Iguana iguana). Herpetologica 30:327–332Google Scholar
  6. Hirth HF (1963) Some aspects of the natural history of Iguana iguana on a tropical strand. Ecology 44:613–615Google Scholar
  7. Hungate RE (1966) The Rumen and Its Microbes. Academic Press, New YorkGoogle Scholar
  8. Hungate RE, Phillips CO, MacGregor A, Hungate DP, Buechner HK (1959) Microbial fermentation in certain mammals. Science 130:1192–1194Google Scholar
  9. Iverson JB (1980) Colic modifications in iguanine lizards. J Morphol 163:79–93Google Scholar
  10. Janis C (1976) The evolutionary strategy of the Equidae, and the origins of rumen and cecal digestion. Evolution 30:757–774Google Scholar
  11. Jarman PG (1974) The social organisation of antelope in relation to their ecology. Behaviour 48:215–267Google Scholar
  12. McBee RH (1971) Significance of the intestinal microflora in herbivory. Annu Rev Ecol Syst 1:65–176Google Scholar
  13. McBee RH, McBee VH (1982) Volatile fatty acid production in the green iguana, Iguana iguana. In: Burghardt GM, Rand AS (eds) Iguanas of the World: Their Behavior, Ecology, and Conservation. Noyes Publications, Park Ridge, New Jersey, pp 77–83Google Scholar
  14. McGinnis SM, Brown CM (1966) Thermal behavior of the green iguana, Iguana iguana. Herpetologica 22:189–199Google Scholar
  15. Müller H (1972) Ökologische und ethologische Studien an Iguana iguana in Kolombien. Zool Beitr 18:109–131Google Scholar
  16. Nagy KA (1977) Cellulose digestion and nutrient assimilation in Sauromalus obesus, a plant-eating lizard. Copeia 1977:355–362Google Scholar
  17. Nagy KA (1982) Energy requirements of free-living iguanid lizards. In: Burghardt GM, Rand AS (eds) Iguanas of the World: Their Behavior, Ecology, and Conservation. Noyes Publications, Park Ridge, New Jersey, pp 49–59Google Scholar
  18. Ostrum JH (1963) Further comments on herbivorous lizards. Evolution 17:368–369Google Scholar
  19. Parra R (1978) Comparison of foregut and hindgut fermentation in herbivores. In: Montgomery GG (ed) The Ecology of Arboreal Folivores. Smithsonian Institution Press, Washington, D.C., pp 205–229Google Scholar
  20. Pough FH (1973) Lizard energetics and diet. Ecology 54:837–844Google Scholar
  21. Robertson JB, Van Soest PJ (1981) The detergent system of analysis and its application to human foods. In: James WPT, Theander O (eds) The Analysis of Dietary Fiber in Food. Marcel Dekker Inc., New York, pp 123–158Google Scholar
  22. Sokol OM (1967) Herbivory in lizards. Evolution 21:192–194Google Scholar
  23. Szarski H (1962) Some remarks on herbivorous lizards. Evolution 16:529Google Scholar
  24. Troyer K (1982) Transfer of fermentative microbes between generations in a herbivorous lizard. Science 216:540–542Google Scholar
  25. Troyer K (1984) Structure and function of the digestive tract of a herbivorous lizard. Physiol Zool (in press)Google Scholar
  26. Troyer K Behavioral acquisition of the hindgut fermentation system by a herbivorous lizard, Iguana iguana. Behav Ecol Sociobiol (in press)Google Scholar
  27. Van Soest PJ (1982) Nutritional Ecology of the Ruminant. O&B Books Inc., Corvallis, OregonGoogle Scholar
  28. White TCR (1978) The importance of a relative shortage of food in animal ecology. Oecologia (Berlin) 33:71–86Google Scholar
  29. Wilhoft DC (1958) Observations on preferred body temperature and feeding habits of some selected tropical iguanas. Herpetologica 14:161–164Google Scholar

Copyright information

© Springer-Verlag 1984

Authors and Affiliations

  • Katherine Troyer
    • 1
    • 2
  1. 1.Department of ZoologyUniversity of CaliforniaDavisUSA
  2. 2.Smithsonian Tropical Research Institute, APOMiamiUSA

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