Lecture 8 - Lecture 8 Jan 23 Species Interactions...

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1 Lecture 8: Jan. 23 Species Interactions: Parasitism & Mutualism • Commensalism • Parasitism - Case of Schistosoma , snails, & humans - Effects on host behavior • Mutualism -Cases of Rhizobium & plants; mycorrhizal fungi & land plants Species Interactions are Dynamic & Conditional Discussion Activity This Week ‘Indirect Effects’ article - read article before you come to discussion (week 4) Exam 1: Wed. Jan 30 6 to 8 pm SSD forms must be delivered to Course Secretary by Jan. 25 at 11 am Review Session: Sunday Jan. 27 Check Qwizdom Points on SAMS https://cats.lsa.umich.edu/ Reading: Chs. 53 :1225-29; 27 :586-7; 30 :682-6; 37 :863-4 Symbioses: “Living Together” Commensalism: + 0 interaction Parasitism: + - interaction Mutualism: + + interaction Commensalism - defined as + 0 interaction commensal’s fitness is increased whereas host is unaffected birds catching insects that antelope flushes out of grass Demodex (Human Hair Follicle Mite) birds nesting in a tree Parasitism - defined as + - interaction Parasite benefits by consuming host nutrients or tissues; parasites are usually smaller than host and do not kill host immediately The broad tapeworm (an endoparasite ) taken from a human intestine mite ectoparasite on aphid species parasitoid wasp eggs on caterpillar prey
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