PSL280H1 Lecture Notes - Lecture 3: Fish Fin, Aquatic Mammal, Trichromacy
6 Oct 2018
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Document Summary
Dolphins display excellent above-water visual abilities in both the wild and in captivity. In captivity, dolphins actually reduce the use of echolocation (use of sound), as above water vision takes on a more demanding role. Poorly-developed colour vision limited to blue/green spectrum only, and has some small movement of the eyes which allows for some binocular vision (use of both eyes) Use both underwater and aerial vision as they live both in water and on land. In-water vision is mostly used for prey detection to avoid enemies and for spatial orientation during migrations spatial orientation refers to being able to see each other to know what is going on in the herd. Eyes play a key role in breeding, birthing, feeding of pups, intrapopulation relationships, and orientation on land. In captivity, seals were able to recognize shapes, distinguish small objects, and analyze visual images. Colour discrimination also within blue/green spectrum: sirenians:
