Response curves: how predators respond to increasing prey density

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Response curves how predators respond to
increasing prey density
predator satiation
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• Prey protection from predation
• By numbers1. Out-reproducing effects of predation
  
• Masting (Eucalyptus sps.)
• Two plots burn vs. control
• 3 weeks following fire
• 405 seeds/m2 on experimental plot
• 10 seeds/m2 on control plot

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Masting a defense against predation?
Aha!
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Cicada masting 13 17 year species density
can reach 4 x 106 individs/ha
Largest recorded biomass for a terrestrial animal.
Bird predators
16 ha study site c. 1 million emerged over
a four day period
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Moose and wolves
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c. 5
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c. 2
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Age of moose killed by wolves
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Exploitation Parasitism
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Tapeworm life history
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Hydatid cyst
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Winter tick an ectoparasite
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Life cycle of Plagiorhynchus cylindraceus
Acanthocephala Spiny-headed worms
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Starling predation on Armadillidium vulgare
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Exploitation of vascular plant by a fungus
Arabis hoelbollii Rockcress, a host Montane and
subalpine zones talus slopes, gravelly
stream-banks Invade, modify host to
enhance Population growth of the fungus
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Puccinia monoica a fungus a rust
pathogenic Reproductive strategy disseminate
spores
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Dispersal of spores