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Keywords:

  • Biogeochemical cycling;
  • ecology;
  • entomology;
  • forest ecosystems;
  • Reticulitermes

1. Termite nitrogenase activity was highest in autumn and spring (≈ 3 μg N2 fixed termite fresh mass (g)–1 day–1) and lowest in winter and summer (≈ 0·8 μg N2 fixed termite fresh mass (g)–1 day–1).

2. The nitrogenase activity of worker termites was significantly higher than all other castes (1·58 ± 0·27 μg N2 fixed termite fresh mass (g)–1 day–1).

3. Worker termites constituted the largest proportion of all the castes throughout the study period (≈ 90%).

4. The localized input of fixed nitrogen by termites may reach 15·3 mg N log–1 day–1 and 5·6 g N log–1 year–1.