BIOL 1902 Lecture Notes - Lecture 14: Beringia, Scavenger, Coevolution
27 Mar 2016
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Baby clams called glochidium: ectoparasites during baby stage. Organs for detecting hosts: can detect humidity, temperature changes, carbon dioxide. Mouthparts for penetrating & holding: ex. Flattened shape to climb through feather, hair (flat flies, live: claws to grip. Black flies & mosquitos aren"t ectoparasites; females only feed temporarily for egg development. Foxes scratch: hosts groom & preen ex. Herons have special grooming claw = pectinate toe (rub through feathers to remove parasites) Beavers have double or split toenail to groom their fur (not known how they use it) True parasites don"t kill hosts; parasitoids do. Cutererbra (bot fly) = endoparasitic only as larva ex. Lives in deer"s brain, doesn"t hurt deer: larvae leave deer in its droppings. Becomes intermediate host when it eats droppings (those w/ parasites in them) Parasites change their behaviour of snails & slugs ex. Become: definitive host brainworm only reproduces in deer daytime feeders.
