L23 simple behaviors

L23 simple behaviors - BILD 3 July 26, 2010 PERCEPTUAL...

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BILD 3 July 26, 2010 Woodruff: simple behaviors 1 PERCEPTUAL SYSTEMS Umwelt: the world around an animal as the animal perceives it -- its “subjective” world. Reality is in the “eye” of the beholder Types of Sensory Receptors Based on energy transduced, sensory receptors fall into five categories and are associated with different modalities of COMMUNICATION: – Chemoreceptors CHEMOSENSORY pheromones – Electromagnetic receptors VISION, ELECTRICAL – Thermoreceptors HEAT – Mechanoreceptors HEARING LE 49-4 0.1 mm Male Silkworm Moth p. 1090 10,000 bombykol receptors Chemo- sensory Pheromones in ants Cooperative feeding as a result of kin recognition Electromagnetic receptors detect electromagnetic energy, such as light, electricity, and magnetism
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BILD 3 July 26, 2010 Woodruff: simple behaviors 2 0.001 o C sensitivity over distances of 8-20 inches • The mechanoreceptors involved with hearing and equilibrium detect settling particles or moving fluid • Hearing and perception of body equilibrium are related in most animals • In most terrestrial vertebrates, sensory organs for hearing and equilibrium are closely associated in the ear • Like other vertebrates, fishes and amphibians have inner ears near the brain • Most fishes and aquatic amphibians also have a lateral line system along both sides of their body LE 50-6 Statolith Sensory nerve fibers Ciliated receptor cells Cilia Invertebrate statocyst sensing gravity & sound LE 50-7 1 mm Tympanic membrane Cockroach ears on forelegs LE 50-12 Lateral line Lateral line canal Epidermis Neuromast Opening of lateral line canal Scale Lateral nerve Segmental muscles of body wal Cupula Supporting cel Nerve fiber Sensory hairs Hair cel Mechano- receptors with hair cells in the lateral line system respond to water movement
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BILD 3 July 26, 2010 Woodruff: simple behaviors 3 Vision in Invertebrates • Most invertebrates have a light-detecting organ • One of the simplest is the eye cup of planarians, which provides information about light intensity and direction but does not form images • Two major types of image-forming eyes have evolved in invertebrates: the compound eye and the single-lens eye • Compound eyes are found in insects and crustaceans and consist of up to several thousand light detectors called ommatidia • Single-lens eyes are found in some jellies, polychaetes, spiders, and many molluscs LE 50-16 Nerve to brain Screening pigment Ocellus Visual pigment Photoreceptor Light Light shining from behind is blocked by the screening pigment Light shining from the front is detected Honeybee waggle dance Direction: angle relative to vertical Distance: length of straight run Fig. 51-8c Waggle dance (food distant) (c) 30° Beehive A B C Location Location Location 30° B A C Referential communication FLOWER BABY HEAR Washoe The first signing chimpanzee Ethology • Ethology is the scientific study of animal
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This note was uploaded on 07/28/2010 for the course BIOLOGY BILD 3 taught by Professor Davidwoodruff during the Summer '10 term at San Diego.

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L23 simple behaviors - BILD 3 July 26, 2010 PERCEPTUAL...

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