Research Repository

See what's under the surface


Sustenance and performance: nutritional reserves, longevity and contest outcomes of fed and starved adult parasitoid wasps (2018)
Journal Article
Snart, C. J., Kapranas, A., Williams, H., Barrett, D. A., & Hardy, I. C. (2018). Sustenance and performance: nutritional reserves, longevity and contest outcomes of fed and starved adult parasitoid wasps. Frontiers in Ecology and Evolution, doi:10.3389/fevo.2018.00012

Dyadic contests for possession of resources occur across a wide range of animal taxa, with contest outcome often being heavily influenced by the energetic reserves of the competitors. The majority of studied parasitoid wasps lack de novo lipogenesis,... Read More

Volatile chemical emission as a weapon of rearguard action: a game-theoretic model of contest behavior (2017)
Journal Article
Mesterton-Gibbons, M., Dai, Y., Goubault, M., & Hardy, I. C. (2017). Volatile chemical emission as a weapon of rearguard action: a game-theoretic model of contest behavior. Bulletin of Mathematical Biology, 79(11), 2413–2449. doi:10.1007/s11538-017-0335-9

We use a game-theoretic model to explore whether volatile chemical (spiroacetal) emissions can serve as a weapon of rearguard action. Our basic model explores whether such emissions serve as a means of temporary withdrawal, preventing the winner of t... Read More

Direct and indirect influences of intercrops on the coconut defoliator Opisina arenosella (2017)
Journal Article
Shameer, K., Nasser, M., Mohan, C., & Hardy, I. C. (2018). Direct and indirect influences of intercrops on the coconut defoliator Opisina arenosella. Journal of Pest Science, 91(1), doi:10.1007/s10340-017-0904-6. ISSN 1612-4758

Coconut palm (Cocos nucifera) infestation by Opisina arenosella (Lepidoptera: Oecophoridae) in the Indian sub-continent may occur in November to May each year in the same or adjoining areas of plantations. Parasitoids of O. arenosella may also be con... Read More

The impact of competition on elephant musth strategies: a game–theoretic model (2017)
Journal Article
Wyse, J. M., Hardy, I. C., Yon, L., & Mesterton-Gibbons, M. (in press). The impact of competition on elephant musth strategies: a game–theoretic model. Journal of Theoretical Biology, doi:10.1016/j.jtbi.2017.01.025. ISSN 0022-5193

Mature male African Savannah elephants are known to periodically enter a temporary state of heightened aggression called “musth,” often linked with increased androgens, particularly testosterone. Sexually mature males are capable of entering musth at... Read More

Reproductive biology of Holepyris sylvanidis (Hymenoptera: Bethylidae) (2016)
Journal Article
Amante, M., Schöller, M., Hardy, I. C., & Russo, A. (2017). Reproductive biology of Holepyris sylvanidis (Hymenoptera: Bethylidae). Biological Control, 106, doi:10.1016/j.biocontrol.2016.12.004. ISSN 1049-9644

Holepyris sylvanidis (Hymenoptera: Bethylidae) is reported as a cosmopolitan parasitoid of coleopteran including a major pest of stored products, the confused flour beetle Tribolium confusum. The reproductive biology, and hence biocontrol potential o... Read More

Metabolomics of aging assessed in individual parasitoid wasps (2016)
Journal Article
Kapranas, A., Snart, C. J., Williams, H. E. L., Hardy, I. C., & Barrett, D. A. (in press). Metabolomics of aging assessed in individual parasitoid wasps. Scientific Reports, 6, doi:10.1038/srep34848. ISSN 2045-2322

Metabolomics studies of low-biomass organisms, such as small insects, have previously relied on the pooling of biological samples to overcome detection limits, particularly using NMR. We show that the differentiation of metabolite profiles of individ... Read More

Reproductive efficiency of the bethylid wasp Cephalonomia tarsalis: the influences of spatial structure and host density (2016)
Journal Article
Eliopoulos, P. A., Kapranas, A., Givropoulou, E., & Hardy, I. C. (in press). Reproductive efficiency of the bethylid wasp Cephalonomia tarsalis: the influences of spatial structure and host density. Bulletin of Entomological Research, doi:10.1017/S0007485316000651. ISSN 0007-4853

The parasitoid wasp Cephalonomia tarsalis (Ashmead) (Hymenoptera: Bethylidae) is commonly present in stored product facilities. While beneficial, it does not provide a high 24 degree of biological pest control against its host, the saw-toothed beetle... Read More

Detecting non-binomial sex allocation when developmental mortality operates (2016)
Journal Article
Wilkinson, R. D., Kapranas, A., & Hardy, I. C. (2016). Detecting non-binomial sex allocation when developmental mortality operates. Journal of Theoretical Biology, 408, doi:10.1016/j.jtbi.2016.08.008. ISSN 0022-5193

Optimal sex allocation theory is one of the most intricately developed areas of evolutionary ecology. Under a range of conditions, particularly under population sub-division, selection favours sex being allocated to offspring non-randomly, generating... Read More

Sex ratios, virginity, and local resource enhancement in a quasisocial parasitoid (2016)
Journal Article
Kapranas, A., Hardy, I. C., Tang, X., Gardner, A., & Li, B. (2016). Sex ratios, virginity, and local resource enhancement in a quasisocial parasitoid. Entomologia Experimentalis et Applicata, 159(2), doi:10.1111/eea.12418. ISSN 0013-8703

Sclerodermus harmandi (Buysson) (Hymenoptera: Bethylidae) is an economically beneficial 2 species of parasitoid wasp that has an unusual level of sociality: groups of female foundresses 3 reproduce on a single host and exhibit cooperative post-ovipos... Read More

Partially-constrained sex allocation and the indirect effects of assisted reproductive technologies on the human sex ratio (2016)
Journal Article
Hardy, I. C., & Maalouf, W. E. (in press). Partially-constrained sex allocation and the indirect effects of assisted reproductive technologies on the human sex ratio. Journal of Biosocial Science, doi:10.1017/S0021932016000146. ISSN 0021-9320

Infertility affects around 15% of human couples and in many countries approximately 1–4% of babies are born following Assisted Reproductive Technologies (ART). Several ART techniques are used and these differentially affect the sex ratio of offspring... Read More

Mutual interference reduces offspring production in a brood- guarding bethylid wasp (2016)
Journal Article
Screenivas, A., & Hardy, I. C. (2016). Mutual interference reduces offspring production in a brood- guarding bethylid wasp. Entomologia Experimentalis et Applicata, 159(2), doi:10.1111/eea.12412. ISSN 0013-8703

Parasitoids have the potential to suppress populations of their hosts and thus may play an 2 important role in influencing the temporal and spatial dynamics of pest arthropods. 3 Behavioural interactions between foraging females, collectively constit... Read More

Impact of neonicotinoid seed treatment of cotton on the cotton leafhopper, Amrasca devastans(Hemiptera: Cicadellidae), and its natural enemies (2015)
Journal Article
Saeed, R., Razaq, M., & Hardy, I. C. (2016). Impact of neonicotinoid seed treatment of cotton on the cotton leafhopper, Amrasca devastans(Hemiptera: Cicadellidae), and its natural enemies. Pest Management Science, 72(6), doi:10.1002/ps.4146. ISSN 1526-498X

BACKGROUND Neonicotinoid seed treatments suppress populations of pest insects efficiently and can enhance crop growth, but they may have negative effects on beneficial arthropods. We evaluated the effects of either imidacloprid or thiamethoxam on th... Read More

Entometabolomics: applications of modern analytical techniques to insect studies (2015)
Journal Article
Snart, C. J., Hardy, I. C., & Barrett, D. A. (2015). Entometabolomics: applications of modern analytical techniques to insect studies. Entomologia Experimentalis et Applicata, 155(1), doi:10.1111/eea.12281. ISSN 0013-8703

Metabolomic analyses can reveal associations between an organism's metabolome and further aspects of its phenotypic state, an attractive prospect for many life-sciences researchers. The metabolomic approach has been employed in some, but not many, in... Read More

Multi-trait mimicry of ants by a parasitoid wasp (2015)
Journal Article
Malcicka, M., Bezemer, T. M., Visser, B., Bloemberg, M., Snart, C. J., Hardy, I. C., & Harvey, J. A. (in press). Multi-trait mimicry of ants by a parasitoid wasp. Scientific Reports, 5, doi:10.1038/srep08043. ISSN 2045-2322

Many animals avoid attack from predators through toxicity or the emission of repellent chemicals. Defensive mimicry has evolved in many species to deceive shared predators, for instance through colouration and other morphological adaptations, but mim... Read More

The importance of alternative host plants as reservoirs of the cotton leaf hopper, Amrasca devastans, and its natural enemies (2014)
Journal Article
Saeed, R., Razaq, M., & Hardy, I. C. (2015). The importance of alternative host plants as reservoirs of the cotton leaf hopper, Amrasca devastans, and its natural enemies. Journal of Pest Science, 88(3), doi:10.1007/s10340-014-0638-7. ISSN 1612-4758

Many agricultural pests can be harboured by alternative host plants but these can also harbour the pests’ natural enemies. We evaluated the capacity of non-cotton plant species (both naturally growing and cultivated) to function as alternative hosts... Read More

Mutually beneficial host exploitation and ultra-biased sex ratios in quasisocial parasitoids (2014)
Journal Article
Tang, X., Meng, L., Kapranas, A., Xu, F., Hardy, I. C., & Li, B. (in press). Mutually beneficial host exploitation and ultra-biased sex ratios in quasisocial parasitoids. Nature Communications, 5, doi:10.1038/ncomms5942. ISSN 2041-1723

Selfish interests usually preclude resource sharing, but under some conditions collective actions enhance per capita gains. Such Allee effects underlay early explanations of social evolution but current understanding focusses on kin selection (inclus... Read More

Higher aggression towards closer relatives by soldier larvae in a polyembryonic wasp (2014)
Journal Article
Dunn, J., Dunn, D. W., Strand, M. R., & Hardy, I. C. (in press). Higher aggression towards closer relatives by soldier larvae in a polyembryonic wasp. Biology Letters, 10(5), doi:10.1098/rsbl.2014.0229. ISSN 1744-957X

In the polyembryonic wasp Copidosoma floridanum, females commonly lay one male and one female egg in a lepidopteran host. Both sexes proliferate clonally within the growing host larva. Distinct larval castes develop from each wasp egg, the majority b... Read More