mardi 19 juillet 2016
2 Offres de Stage en Australie
2 internships-6 months- (Master 2, University Diploma, other…) are available in John Endler Group (Deakin university, Australia). It is required to have a good skill to communicate in English.
· 1 project on sensory ecology (colour vision)
· 1 project on gene expression
COLOUR VISION: LINK BETWEEN THEORETICAL DISCRIMINATION AND ACTUAL PERCEPTION
Colours are used in various inter-individual relationships: for species recognition, as an aposematic signal, for camouflage, and in mate choice. With our human eyes and cognition, we can only get a biased idea of the colours in the world. To better understand the evolution of colour and their functions it is essential to assess animal colour vision, colour discrimination and colour perception.
Thanks to the Just Noticeable Distance model, allowing determination of colour discrimination thresholds based on physiological characteristics, we can get a good idea of animal colour discrimination. However to determine perceptual colour space, influenced by neural processes, accurate behavioural experiments are necessary. Behavioural experiments will allow us to determine the correlation between the theoretical model of colour discrimination and the actual colour perception.
SUPERVISOR: Adelaide Sibeaux (PhD Candidate), Dr.Gemma Cole & Prof.John Endler
Contact: email@example.com, Phone: +61 434 094 164
· Kemp, D. J., Herberstein, M. E., Fleishman, L. J., Endler, J. A., Bennett, A. T. D., Dyer, A. G., et al. (2015). An Integrative Framework for the Appraisal of Coloration in Nature. American Naturalist, 185(6), 705-724.
· Fleishman, L. J., Perez, C. W., Yeo, A. I., Cummings, K. J., Dick, S., & Almonte, E. (2016). Perceptual distance between colored stimuli in the lizard Anolis sagrei: comparing visual system models to empirical results. Behavioral Ecology and Sociobiology, 70(4), 541-555.
TECHNIQUES INVOLVED IN THE PROJECT: Radiance/Irradiance/Reflectance measurement, Behavioural and learning experiments, Animals maintenance, Statistics.
REQUIRED SKILLS AND ABILITIES: Statistics (R or Matlab), Conscientious, Interest for sensory ecology.
IS THERE A CIRCADIAN RHYTHM TO VISUAL OPSIN EXPRESSION IN GUPPIES AND DOES THIS COINCIDE WITH SPECIFIC MATE CHOICE BEHAVIOURS?
This project will explore diurnal changes in the visual system of guppies (Poecilia reticulata), by investigating the expression levels of nine guppy opsin genes throughout different times of day. Opsins are light sensitive proteins found in the photoreceptor cells of the retina. As such, opsins function at the interface between the outside light environment and the visual system. In some species, opsin expression levels change throughout the day. In guppies, any diurnal opsin expression changes may influence colour-based behavioural decisions, such as foraging or mate-choice. First, this project will identify any changes in opsin expression over diurnal time. Second, it will explore whether any reported opsin expression changes could have implications for a guppy’s visual perception and mate-choice behaviours.
SUPERVISOR: Dr. Alexandrea Kranz & Dr. Gemma Cole & Prof. John Endler
· Johnson A. M, Stanis S, Fuller R. C. (2013) Diurnal lighting patterns and habitat alter opsin expression and colour preferences in a killifish. Proc Biol Sci. 280(1763): 20130796
TECHNIQUES INVOLVED IN THE PROJECT: Fish rearing and handling; eye dissections; molecular techniques (including RNA extraction, cDNA synthesis and digital PCR).
REQUIRED SKILLS AND ABILITIES: Comfortable with fish dissections and early/late hours. English speaking is essential.