Bio%20201%20S12%20Lect%2018%20%28True%29%20v2

Common to trees subject to seed herbivory acorn weevil

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Unformatted text preview: Parasites can substanAally decrease host populaAon size •  Parasites affect the structure of host communiAes Defining Parasites •  Parasite: a predatory organism that feeds off another but generally does not kill it •  Host: prey of a parasite parasitoid disease parasite Defining Parasites – duration with host •  Some parasites live with their host most of lives •  Some parasites drop off after prolonged feeding (e.g., ticks, leeches) •  Some plant parasites are parasitic on other plants tapeworm Ack mistletoe Average number of parasite species per host 0 2 4 6 8 10 12 14 16 Fish Birds Mammals True bugs Beetles Flies Wasps Butterflies and moths Trees (95) Parasites Affect Host PopulaAons Saline marshes in North America and the plant parasite, Cuscuta salina Parasites Affect CommuniAes •  The meningeal brain- worm (nematode) Parelaphostrongylus tenuis –  potenAal hosts –  white- tailed deer (tolerant) –  pronghorn antelope –  other cervids (Cervidae; deer family) From parasites to disease – Important scienAfic fields= infecAous disease epidemiology What is ”infecAous disease epidemiology”? •  IdenAficaAon of causes of new, emerging infecAons e.g. HIV, SARS •  Surveillence of infecAous disease •  IdenAficaAon of source of outbreaks •  Studies of routes of transmission and natural history of infecAons •  IdenAficaAon of new intervenAons...
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This note was uploaded on 10/02/2013 for the course BIO 201 taught by Professor True during the Spring '08 term at SUNY Stony Brook.

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