RSG 22-1 Energy Flow in Ecosystems

SmithLifeScience Name __________________ Period _____

Reading Study Guide Chapter 22 Ecosystems and Biomes
22-1 Energy Flow in Ecosystems (pp.740-745)

1-5. Where Did Your Dinner Come From?
List what you had for dinner last night.
Next to each item write the name of the plant or animal that was the source of the food.

    Example:   Macaroni & Cheese
                    Macaroni- wheat
                    Cheese- cow

What I ate... Where it came from...

6-15 Section Vocabulary

_____ Producer		A. consumers that eat only plants
_____ Consumer		B. consumers that eat both plants and aniamls
_____ Herbivore		C. carnivore that feeds on the bodies of dead organisms
_____ Carnivore		D. a series of events where one organism eats another and obtains energy
_____ Omnivore		E. an organism that makes its own food
_____ Scavenger		F. many overlapping food chains
_____ Decomposer		G. a diagram that shows the amount of energy that moves from one feeding level to another in a food web
_____ Food Chain		H. obtains energy by feeding on other
_____ Food Web		I. break down wastes and dead organisms and returns the raw materials to the ecosystem
_____ Energy Pyramid		J. consumers that eat only animals

Energy Roles (p.740-741)

16. Name a producer. ____________________________

17. Name a consumer. ____________________________

18. Name an omnivore. ____________________________

19. Name a scavenger. ____________________________

20. Name a decomposer. __________________________

Food Chains and Food Webs (p.742-743)

SciFoodWeb.bmp (324954 bytes)

Create 3 food chains from this food web.

21. --> --> --> -->

22. --> --> --> -->

23. --> --> --> -->

Kangaroo & Dingo Graph
A university student was studying the animals in the Grant Memorial National Park.
Following are the numbers of kangaroos and dingoes that were recorded visiting a watering site in the middle of the park over two years.

Create a line graph by plotting the animal numbers on the vertical axis against time on the horizontal axis. Plot the kangaroo numbers and the dingo numbers on the same graph but use different colors for each line.

Year 2006	Kangaroo population estimate	Dingo population estimate	Year 2007	Kangaroo population estimate	Dingo population estimate
January	111	16	January	130	16
February	109	18	February	124	19
March	93	21	March	113	23
April	91	17	April	108	24
May	90	16	May	99	20
June	86	14	June	95	19
July	89	12	July	97	15
August	94	9	August	100	14
September	98	11	September	106	11
October	105	13	October	109	13
November	121	15	November	113	14
December	125	16	December	111	18

24. What patterns can be seen in the graph? Suggest reasons for any patterns.

25. Is there any relationship between the kangaroo and the dingo numbers? If so, account for this.

26. The park management have decided to stop a rabbit prevention program because it is too expensive.
What effect could this have on the dingo population and why?

Energy Pyramids (p. 744-745)

27. In an energy pyramid the most energy is found at the _________________ level.

28. What percentage of energy is usually transferred to the next higher level? __________

29. How is the percentage of energy that is not transferred to the next higher level used?

30. Are there more organisms at the bottom or the top of an energy pyramid? ____________