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Behavioural, tomographic and biomechanical analysis of socially induced changes in body and brain structure in desert locusts


About This PhD Project

Project Description

All animals can tailor their phenotype to the environmental conditions they experience during their lifetime. Such phenotypic plasticity typically entails concerted changes in morphology, physiology and behaviour. SRO is using the Desert Locust Schistocerca gregaria as a model to analyse phenotypic plasticity that is induced by social experience. Locusts respond to crowding by radically transforming their body, brain and behaviour from a shy, lone-living solitarious phase to a gregarious phase adapted for a life in dense migratory swarms [1]. This capacity underpins the infamous locust swarms that can devastate crops and pastures on a continental scale. SRO and TM have set up world-leading breeding facilities for generating both phases under precisely controlled laboratory conditions. TM has a strong track record in analysing the kinematics and biomechanics of limb movements in locusts and related insects [2].

The many lifestyle-specific adaptations of the two phases include body posture and locomotion. Solitarious locusts walk infrequently and with a creeping gait, keeping the body close to the ground. Gregarious locusts use a rapid, stilted gait to cover huge distances by walking as wingless juveniles. These pronounced behavioural differences are paralleled by differences in the musculoskeletal machinery of the thorax. This machinery underpins both walking and flight, with several bi-functional muscles serving in both behaviours. Further anatomical correlates of the different life styles are evident in the locust head. Adult gregarious locusts have smaller heads but larger brains than age-matched solitarious locusts; the relative proportions of different brain regions also differ markedly [3]. However, we now have evidence that solitarious locusts, which are much longer-lived, far surpass gregarious locusts in brain size later in life.

In this project you will use X-ray computed micro-tomography (‘micro-CT’), a novel bioimaging technique that reveals internal structure in intact animals with micrometre resolution, to carry out the first simultaneous 3D computer reconstructions of the skeleton, musculature and central nervous system of the locust head and thorax. You will use sophisticated computational morphometry tools, including 3D statistical techniques, to localise and characterise volume and shape differences between solitarious and gregarious brain and body structures. You will then apply Finite Element Analysis (FEA), a highly advanced computer modelling technique, to predict mechanical forces in the reconstructed skeletal structures. This will enable you to address fundamental questions about the scope and limits of structural plasticity in relation to behavioural plasticity.

Eligibility:
UK/EU applicants only.

Entry requirements:
Applicants are required to hold/or expect to obtain a UK Bachelor Degree 2:1 or better in a relevant subject.
The University of Leicester English language requirements apply where applicable: https://le.ac.uk/study/research-degrees/entry-reqs/eng-lang-reqs/ielts-65

How to apply:
Please refer carefully to the application guidance and apply using the online application link at https://le.ac.uk/study/research-degrees/funded-opportunities/bbsrc-mibtp

Project / Funding Enquiries:
Application enquiries to
Closing date for applications: Sunday 12th January 2020

References

1. Burrows M, Rogers SM, Ott SR (2011) Epigenetic remodelling of brain, body and behaviour during phase change in locusts. Neural Syst Circuits 1:11.

2. Ache JM, Matheson T (2013) Passive joint forces are tuned to limb use in insects and drive movements without motor activity. Curr Biol 23: 1418–1426.

3. Ott SR, Rogers SM (2010). Gregarious desert locusts have substantially larger brains with altered proportions compared with the solitarious phase. Proc Biol Sci 277:3087–96.

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