PNB 2XC3 Chapter Notes - Chapter 12: Faked Death, Episodic Memory, Optimal Foraging Theory
16 Dec 2017
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These worms startle or distract potential predators with bombs of green fluorescent light. 5 of 7 species produce small bioluminescent sacs (globules) Light up for a few seconds after worm releases them and may startle a predator long enough to escape. Homologous with other known anatomical structures (segmented branchiae) in annelid worms that do not have bioluminescent sacs (don"t know where structure derived from) Natural selection has favoured ground squirrels that are able to identify their predators and respond with fine-tuned behaviours. Throw dirt, pebbles, roots at predators, emitting alarm calls that are specifically made when snakes are present. Squirrels immune systems have evolved for this. Poran and cross examined young california ground squirrel"s antipredator behaviour and immunological defence against snake bites. At young ages, pups have very serum-to-venom binding levels, but this measure rises to almost adult levels between 14-30 days. This spike is due to the fact that they only come out of their burrows at 40 days.
