adaptations for survival: symbioses, camouflage & mimicry
TRANSCRIPT
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OCN 201 Biology Lecture 11
http://www.berkeley.edu/news/media/releases/2005/03/24_octopus.shtmlhttp://www.oceanfootage.com/stockfootage/Cleaning_Station_Fish/
Adaptations for Survival: Symbioses, Camouflage & Mimicry
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• Parasitism - negative effect on host
• Commensalism - no effect on host
• Mutualism - both parties benefit
Symbiosis
Often involves food but benefits may also include protection from predators, dispersal, or habitat
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ParasitesLeeches (Segmented Worms)
Nematodes (Roundworms)
Tongue Louse (Crustacean)
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Whale Barnacles & Lice
Commensalism or Parasitism?
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Commensalism or Mutualism?
http://www.scuba-equipment-usa.com/marine/APR04/
http://magma.nationalgeographic.com/
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Mutualism
Anemone Hermit Crab
Cleaner Shrimphttp://magma.nationalgeographic.com/
http://www.scuba-equipment-usa.com/marine/APR04/
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Camouflage Countershading
http://www.nmfs.noaa.gov/pr/images/cetaceans/orca_spyhopping-noaa.jpg
Countershading coloration of the Caribbean reef shark © George Ryschkewitsch
JONATHAN CHESTER
SharksBirds
Mammals
Fish
shiftingbaselines.org/blog/big_tuna.jpg
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Adaptive Camouflage
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Camouflage
http://www.cspangler.com/images/photos/aquarium/weedy-sea-dragon2.jpg
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Camouflage by Mimicry
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Mimicry
• Batesian: an edible species evolves to look similar to an inedible species to avoid predation
• Mullerian: two or more inedible species all evolve to look similar maximizing efficiency with which predators learn to avoid them
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Batesian MimicryPufferfish (poisonous)
Filefish (non-poisonous)
An edible species evolves to resemble an inedible species to avoid predators
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http://www.rzuser.uni-heidelberg.de/~bu6/Introduction06.html
Batesian Mimicry Nudibranchs & Flatworms
Non-Toxic Flatworms
Toxic Nudibranchs
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http://www.rzuser.uni-heidelberg.de/~bu6/Introduction06.html
Batesian Mimicry Nudibranchs & Flatworms
Non-Toxic Flatworms
Toxic Nudibranchs
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Defense
• Size
• Slime
• Toxins
A few examples
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Size
Pufferfish inflates by gulping water
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Slime!
Hagfish secrete copious amounts of slime when disturbed which clogs the gills of potential predators
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Toxins
http://www.qm.qld.gov.au/
Symbiotic bacteria
Sponge
nudibranch
Mimicry by flatworm
Sponges use toxins as a defense, but the toxins are produced by a symbiotic bacteria that live in
association with the sponge
Nudibranchs eating the sponges are immune to the toxin, but sequester the toxin making them toxic to
their own predators
Flatworms are NOT toxic, but evolve color patterns that mimic the nudibranch, making it appear as if they
are toxic, thus protecting them from predators (Batesian Mimicry)