• Publications
  • Influence
Measuring ammonia emissions from land applied manure: an intercomparison of commonly used samplers and techniques.
The conclusions from this study are that for the measurement of absolute emissions the mass balance technique is to be preferred, and for small-plot comparative measurements the wind tunnel system is preferred to the equilibrium concentration technique.
Reduction of ammonia emission by slurry application techniques.
Livestock manures and slurries are, currently, almost entirely surface applied to land in the UK but research has shown that, under experimental conditions, injection of slurry or restricted surface
Biogeography and community structure of North American seed-harvester ants.
  • R. Johnson
  • Biology, Medicine
    Annual review of entomology
  • 2001
This review attempts to adjust this paradigm, suggesting that interspecific competition for food is probably less important than previously thought, whereas intraspecific competition is common and strong.
Foundress survival and brood production in the desert seed-harvester ants Pogonomyrmex rugosus and P. barbatus (Hymenoptera, Formicidae)
It is demonstrated that water is the most important factor effecting colony establishment and growth in the two ecologically equivalent sister species of desert seed-harvester ants Pogonomyrmex rugosus and P. barbatus.
Slurry application techniques to reduce ammonia emissions: results of some UK field-scale experiments
Shallow injection, trailing shoe and band spreading machines were evaluated, in terms of their potential for reducing ammonia (NH3) emission, by making measurements after application and in direct
Predation by Megaponera foetens (Fabr.) (Hymenoptera: Formicidae) on termites in the Nigerian southern Guinea Savanna
It is concluded that factors including termite abundance,termite foraging regimes and seasonality, termite biomass and the reactions of the ants to the termites and their products are involved in successful predation of termites by Megaponera.
The inoculation of the fungus comb in newly founded colonies of some species of the Macrotermitinae (Isoptera) from Nigeria
The critical factor in the survival of newly-founded colonies of the fungus-growing termites (Macrotermitinae) is the successful inoculation of the new comb with the fungus Termitomyces, which appears to be mutually exclusive.
Modification of soils in Nigerian savanna by soil-feeding Cubitermes (isoptera, termitidae)
Abstract Soil-feeding termites ingest humified, organic-rich soil. The soil faeces are used for nest construction and mounds of two species of Cubitermes contained more soil, clay, exchangeable Ca
Independent colony founding by ergatoid queens in the ant genus Pogonomyrmex: queen foraging provides an alternative to dependent colony founding
Overall, this study demonstrates that care should be taken before concluding that ant colonies employ DCF based solely on queen morphology, and indicates that abundance and/or predictable food resources likely select for the evolution of semi-claustral nest founding and ICF by these ergatoid queens.
Abundance and Distribution of Termites (Isoptera) in a Riparian Forest in the Southern Guinea Savanna Vegetation Zone of Nigeria
Thirty-three species of termites were found in a riparian forest in the Southern Guinea savanna zone of Nigeria. Their total abundance and biomass was 2646 m-2 and 6.90 g m-2, respectively. The