ZOO 3700 Lecture Notes - Lecture 14: Invertebrate, Chaetognatha, Chemosynthesis
20 Oct 2014
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Prey: what are some morphological adaptations that invertebrate hunters have for capturing, explain how hunters and parasites could be considered opposite ends of a continuum (rather than distinct categories). Its more than just shifting gene frequencies. Density of deposit feeders limited by food availability. Density of suspension feeder limited by space. Mobile animals that attack, kill, and consume individual prey items one at a time, usually other mobile animals. Chase after, catch, and subdue highly mobile prey. Actively forage, seeking out prey with less-developed powers of movement than themselves. Often possess adaptations for dealing with prey that are hard to handle and digest. E. g. sea stars, moon snails, nemerteans, nereus (polychaete), green crabs. Aside from an unusually fast catching behavior, are typically sedentary. Often live in burrow of some kind. E. g. burrowing spiders, grasshoppers, cnidarians, giant water bugs, mantis shrimp, chaetognath (arrow worm) Adaptations for handling prey - chelate vs. subchelate.
