Differential role of symbiotic fungi in lignin degradation and food provision for fungus-growing termites (Macrotermitinae

Isoptera)

Fujio Hyodo, I. Tayasu, T. Inoue, J. I. Azuma, T. Kudo, T. Abe

Research output: Contribution to journalArticle

68 Citations (Scopus)

Abstract

1. To investigate whether the role of symbiotic fungi in lignin degradation and food provision differs among fungus-growing termites (four species of Macrotermes, three species of Odontotermes, Hypotermes makhamensis, Ancistrotermes pakistanicus and Pseudacanthotermes militaris), the chemical composition of fungus combs of different ages and the chitinolytic activity in the gut of termites were analysed. In addition, the carbon stable isotope ratios (δ13C) in old combs, worker termite tissues and fungal nodules (aggregated conidia) were compared. 2. In Macrotermes spp., the carbohydrate: lignin ratio of the combs increased with increased comb age, but it decreased or remained the same in Odontotermes spp., H. makhamensis, A. pakistanicus and P. militaris. In contrast, the chitin:carbohydrate ratio and ash content increased more over time in the combs of Odontotermes spp., H. makhamensis, A. pakistanicus and P. militaris than in the combs of Macrotermes spp. 3. Chitinolytic activity in the gut of workers was higher in O. takensis, H. makhamensis and A. pakistanicus than in M. annandalei. 4. In all species examined, the δ13C value increased in the sequence: old combs <termites <fungal nodules. Based on a two-source model of δ13C, the contribution of fungi to termite nutrition was considered higher in Odontotermes spp., H. makhamensis, A. pakistanicus and P. militaris than in Macrotermes spp. 5. These results suggest that symbiotic fungi play different roles among fungus-growing termites. In Macrotermes spp., the main role of symbiotic fungi is to degrade lignin, so that the termites can utilize cellulose more efficiently, whereas in Odontotermes spp., H. makhamensis, A. pakistanicus and P. militaris, it is to serve as a food source.

Original languageEnglish
Pages (from-to)186-193
Number of pages8
JournalFunctional Ecology
Volume17
Issue number2
DOIs
Publication statusPublished - Apr 2003
Externally publishedYes

Fingerprint

combs (social insects)
termite
Odontotermes
Macrotermes
Isoptera
lignin
fungus
degradation
fungi
food
Pseudacanthotermes
carbohydrate
digestive system
carbohydrates
chitin
ash content
conidia
stable isotopes
carbon isotope
cellulose

Keywords

  • Carbon stable isotope ratio
  • Food provision
  • Fungus-growing termite
  • Lignin degradation
  • Termitomyces

ASJC Scopus subject areas

  • Ecology

Cite this

Differential role of symbiotic fungi in lignin degradation and food provision for fungus-growing termites (Macrotermitinae : Isoptera). / Hyodo, Fujio; Tayasu, I.; Inoue, T.; Azuma, J. I.; Kudo, T.; Abe, T.

In: Functional Ecology, Vol. 17, No. 2, 04.2003, p. 186-193.

Research output: Contribution to journalArticle

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