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Lecture24bio - • A species moves out of its home range...

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BIOLOGY 1001 Wednesday, April 23, 2008 Lecture 24 Predator Responses Predators counter prey defenses with new adaptations o Stealth o Camouflage o Avoidance of Chemical Repellents Warning Coloration: Means: Eat me at your own risk! Prey Defenses: Toxic Compounds (Monarch Caterpillar) Prey Defenses: Frightening Pigmentation (False-eyed frog, peacock moth, butterfly larva) What is Symbiosis? Is a close, prolonged association between two or more different organisms of different species. Copy Table on Page 820 of book. Parasitism Parasites o Draw nutrients from hosts o Live on or in host body Mutualism (Clownfish and Anemones, Ants & Acacia trees) Commensalism: One benefits and one doesn’t care. (Orchids & Trees) Species Introductions Exotic Species
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Unformatted text preview: • A species moves out of its home range and takes up residence in a new place. • No natural enemies or controls. • Can out-complete native species. Kudzu in Georgia • Imported for erosion control. • No natural herbivores, pathogens, or competitors • Grows over landscapes and cannot be dug up or burned out. • May turn out to have some commercial use. Rabbits in Australia • Rabbits were introduced for food and sport hunting • Without predators, their numbers soared. • Attempts at control using fences or viruses have thus far been unsuccessful. Exotic Species: No natural enemies or controls (Giant African Snails seized from schools, rosy wolf snail, water hyacinth)...
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