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BIOL 1902 Lecture Notes - Scavenger, Eating Animals

Course Code
BIOL 1902
Michael Runtz

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o Black Flies are not ectoparasites; Mosquitos no
o Ticks are also ECTOPARASITES
o Some Mites are ectoparasites
Many migratory birds harbour ectoparastic flies
o FLAT FLIES are one group
Are clams ectoparasites
o Filter feeds: adults are not, babies are (on fish -> gills mainly)
o Glochidia are ectoparasites on fish gills and fins
Tick mouthparts for penetrating and holding
Hosts often try to get rid of ticks, etc
o Heron -> GROOM and PREEN
Special Grooming Claw
o Beavers have one too
o Some parasites live inside the host (ENDOPARASITES)
Deer have parasitic in brain BRAINWORM
o Reproduce in deer
o Deer droppings carry the larvae
If moose eats an infected intermediate host,
o Goes to brain and eats up to spinal chord and brain tissue
o Thus, brainworm in wrong host can kill
o Why does brainworm only kill moose (42:00 Nov7)
Robins harbour a parasitic FLUKE (definitive host)
Aquatic snail (intermediate host)
Ectoparasites and endoparasites have adaptions and problems too
Eating animals that are already dead SCAVENGING
o Most scavengers eat live animals too (eagles)
o Part time scavengers: ________
o Full time scavengers: obligated
Turkey Vultures are full time
o Featherless head
o Raptorial bill
o Ability to digest putrid meat
Small animals also scavenge
o Blow Flies lay their eggs on dead animals
Food shortages
Bohemian Waxwings move in the thousands IRRUPTIVE movement
o Crossbills are IRRUPTIVE
o Great Gray Owls are also Irruptive