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How do energy and mass flow through a food web? Activity Objectives 1. Use owl pellets to model a food web. 2. Calculate energy transfer and biomass at each trophic level of a barn owl food web. Next Generation Science Standards* (NGSS) MS-LS2-3. Develop a model to describe the cycling of matter and flow of energy among living
Use the following facts from Chart #2 about the prey to draw a complete food web that is representative of the pellet your group dissected. Draw your food web on separate paper. Chart #2.
Dissect owl pellets to collect and count the contents in order to create food webs and pyramids of numbers and biomass. Student Objectives: Students will learn the term pyramid is a misnomer because of the huge amount energy required by organisms to maintain homeostasis. Background Information.
Owl pellets can be used to construct a food web. Scientists study pellets to discover regional, seasonal, and habitat differences in owl prey. Pellets also reveal information about the relative numbers of small animals found in an owl’s feeding area. One study of 200 pellets from a barn owl found 454 mammal skulls, which included 225 voles ...
The owl digestive system has a specialized section that presses the undigested portions together forming a pellet. Since the owls can not pass the pellet through their digestive system, they must spit out the pellet. Materials: owl pellets, dissecting tools, identification keys, skeleton diagram, sorting sheet Procedure 1. One owl pellet per ...
Combining owl pellet dissection and a low stakes food/energy web activity allows students to observe and handle tangible evidence of energetics before constructing a more complete picture. It also provides an opportunity for students to incorporate alternative food and nutrient webs into their concept of energy flow through an ecosys-tem.
By studying owl pellets scientists can effectively illustrate the nature of food chains and the role of avian predators within an ecosystem. The owl pellets that you will be examining in this lab have been collected and fumigated from common barn owls (Tyto alba).
