Your notes from the film may help you with your pond food webs. The film also showed a variety of ways that pond organisms are protected from their predators. Use the examples below from the film to help you review the ways that predators may act as a selective force on their prey. Backswimmer insects that swim on their backs have light backs and dark bellies. Phantom midges are transparent.
Snails have shells.
Beetles and bugs have hard bodies. Caddis fly larvae spin a case of silk around themselves and interweave sticks or pebbles into the case. The case ends up looking just like a bunch of sticks or pebbles. Plankton float together in massive crowds 6. Productivity of Global Ecosystems Primary productivity depends on the availability of limiting resources for plant growth.