ENVS 2210 Chapter 26-30: Bees - Biology and Management, Chapters 26-30

• School: University of Guelph
• Department: Environmental Sciences
• Course: ENVS 2210
• Professor: Ernesto Guzman

Document Summary

Types of vision: trichromatic colour vision, achromatic. : there is no colour, as for nocturnal animals. The eye: highly specialized organ of photoreception, or the conversion of light energy into nerve action potential, types of eye, simple eyes: detect brightness and direction, camera eye of vertebrates, compound eye. The ocelli: three simple eyes located on the top of the honeybee head (check figure 26-1 for structural diagram, can monitor light intensity, period of exposure to light and wavelength, do not form images. Compound eyes: located on the side of the head, organs for colour vision, shape and pattern vision, contrast vision, detection of motion. 4-5000 facets in workers, 7-8000 in drones and 3,500 in queens information from all facets is gathered, a complete image is formed. Vision process: light enters each facet through the corneal lens, passes into the cone lens (crystalline cone) which is surround by primary iris cells. Iris cells reflect incoming light to the retinula cells.