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FOOD WEB ANALYSIS ACTIVITY
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ACTIVITY INSTRUCTIONS
In this activity, you will need the following: 1) The Food Web Analysis Worksheet. 2) Pencil. 3) Pencil crayons or colored pencils. 4) Eraser.
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ACTIVITY OBJECTIVES In this activity, you will learn the following:
1) How to count the number of food chains in a food web. 2) How to determine how many food chains an organism belongs to in a food web. 3) How to identify and count the following organisms in the food web: herbivores, omnivores, carnivores, top carnivores, primary consumers, secondary consumers, tertiary consumers and quaternary consumers. 4) How to identify and count organisms that have more than one role in the food web. E.g. organisms that are both primary and secondary consumers. 5) How to determine the effect an organism would have on other members of the food web if it were to go extinct.
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FOOD WEBS A food web is made up of a group of _____________
__________. interconnected food chains Food Web: grasses mouse hawk snake coyote How many food chains are in this simple food web? Food Web #1
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1 FOOD WEBS A food web is made up of a group of _____________
__________. interconnected food chains Food Web: hawk hawk hawk hawk hawk hawk coyote coyote snake 1 How many food chains are in this simple food web? mouse grasses Food Web #1
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2 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote snake 2 How many food chains are in this simple food web? mouse grasses Food Web #1
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3 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote snake 3 How many food chains are in this simple food web? mouse Try the next one on your own. grasses Food Web #1
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FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote snake Difficulty: Easy frog Count how many food chains there are in total in this food web. mouse grass hopper grasses aquatic plants Food Web #2
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1 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote snake 1 Difficulty: Easy frog Count how many food chains there are in total in this food web. mouse grass hopper grasses aquatic plants Food Web #2
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2 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote snake 2 Difficulty: Easy frog Count how many food chains there are in total in this food web. mouse grass hopper grasses aquatic plants Food Web #2
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3 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote snake 3 Difficulty: Easy frog Count how many food chains there are in total in this food web. mouse grass hopper grasses aquatic plants Food Web #2
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4 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote snake 4 Difficulty: Easy frog Count how many food chains there are in total in this food web. mouse grass hopper grasses aquatic plants Food Web #2
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5 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote snake 5 Difficulty: Easy frog Count how many food chains there are in total in this food web. mouse grass hopper Try the next one on your own. grasses aquatic plants Food Web #2
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FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Count how many food chains there are in total in this food web. snake frog dragonfly mouse Difficulty: Medium butterfly grass hopper grasses aquatic plants Food Web #3
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1 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Count how many food chains there are in total in this food web. snake 1 frog dragonfly mouse Difficulty: Medium butterfly grass hopper grasses aquatic plants Food Web #3
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2 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Count how many food chains there are in total in this food web. snake 2 frog dragonfly mouse Difficulty: Medium butterfly grass hopper grasses aquatic plants Food Web #3
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3 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Count how many food chains there are in total in this food web. snake 3 frog dragonfly mouse Difficulty: Medium butterfly grass hopper grasses aquatic plants Food Web #3
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4 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Count how many food chains there are in total in this food web. snake 4 frog dragonfly mouse Difficulty: Medium butterfly grass hopper grasses aquatic plants Food Web #3
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5 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Count how many food chains there are in total in this food web. snake 5 frog dragonfly mouse Difficulty: Medium butterfly grass hopper grasses aquatic plants Food Web #3
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6 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Count how many food chains there are in total in this food web. snake 6 frog dragonfly mouse Difficulty: Medium butterfly grass hopper grasses aquatic plants Food Web #3
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7 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Count how many food chains there are in total in this food web. snake 7 frog dragonfly mouse Difficulty: Medium butterfly grass hopper grasses aquatic plants Food Web #3
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8 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Count how many food chains there are in total in this food web. snake 8 frog dragonfly mouse Difficulty: Medium butterfly grass hopper Try the next one on your own. grasses aquatic plants Food Web #3
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FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Difficulty: Hard snake frog dragonfly mouse bird butterfly butterfly grass hopper housefly Count how many food chains there are in total in this food web. grasses aquatic plants terrestrial plants Food Web #4
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1 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Difficulty: Hard snake 1 frog dragonfly mouse bird butterfly butterfly grass hopper housefly Count how many food chains there are in total in this food web. grasses aquatic plants terrestrial plants Food Web #4
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2 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Difficulty: Hard snake 2 frog dragonfly mouse bird butterfly butterfly grass hopper housefly Count how many food chains there are in total in this food web. grasses aquatic plants terrestrial plants Food Web #4
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3 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Difficulty: Hard snake 3 frog dragonfly mouse bird butterfly butterfly grass hopper housefly Count how many food chains there are in total in this food web. grasses aquatic plants terrestrial plants Food Web #4
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4 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Difficulty: Hard snake 4 frog dragonfly mouse bird butterfly butterfly grass hopper housefly Count how many food chains there are in total in this food web. grasses aquatic plants terrestrial plants Food Web #4
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5 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Difficulty: Hard snake 5 frog dragonfly mouse bird butterfly butterfly grass hopper housefly Count how many food chains there are in total in this food web. grasses aquatic plants terrestrial plants Food Web #4
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6 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Difficulty: Hard snake 6 frog dragonfly mouse bird butterfly butterfly grass hopper housefly Count how many food chains there are in total in this food web. grasses aquatic plants terrestrial plants Food Web #4
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7 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Difficulty: Hard snake 7 frog dragonfly mouse bird butterfly butterfly grass hopper housefly Count how many food chains there are in total in this food web. grasses aquatic plants terrestrial plants Food Web #4
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8 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Difficulty: Hard snake 8 frog dragonfly mouse bird butterfly butterfly grass hopper housefly Count how many food chains there are in total in this food web. grasses aquatic plants terrestrial plants Food Web #4
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9 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Difficulty: Hard snake 9 frog dragonfly mouse bird butterfly butterfly grass hopper housefly Count how many food chains there are in total in this food web. grasses aquatic plants terrestrial plants Food Web #4
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10 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Difficulty: Hard snake 10 frog dragonfly mouse bird butterfly butterfly grass hopper housefly Count how many food chains there are in total in this food web. grasses aquatic plants terrestrial plants Food Web #4
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11 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Difficulty: Hard snake 11 frog dragonfly mouse bird butterfly butterfly grass hopper housefly Count how many food chains there are in total in this food web. grasses aquatic plants terrestrial plants Food Web #4
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12 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Difficulty: Hard snake 12 frog dragonfly mouse bird butterfly butterfly grass hopper housefly Count how many food chains there are in total in this food web. grasses aquatic plants terrestrial plants Food Web #4
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13 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Difficulty: Hard snake 13 frog dragonfly mouse bird butterfly butterfly grass hopper housefly Count how many food chains there are in total in this food web. grasses aquatic plants terrestrial plants Food Web #4
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14 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Difficulty: Hard snake 14 frog dragonfly mouse bird butterfly butterfly grass hopper housefly Count how many food chains there are in total in this food web. grasses aquatic plants terrestrial plants Food Web #4
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15 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Difficulty: Hard snake 15 frog dragonfly mouse bird butterfly butterfly grass hopper housefly Count how many food chains there are in total in this food web. grasses aquatic plants terrestrial plants Food Web #4
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16 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Difficulty: Hard snake 16 frog dragonfly mouse bird butterfly butterfly grass hopper housefly Count how many food chains there are in total in this food web. grasses aquatic plants terrestrial plants Food Web #4
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17 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Difficulty: Hard snake 17 frog dragonfly mouse bird butterfly butterfly grass hopper housefly Count how many food chains there are in total in this food web. grasses aquatic plants terrestrial plants Food Web #4
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18 FOOD WEBS A food web is made up of a group of _____________
__________. Food Web: interconnected food chains hawk hawk coyote Difficulty: Hard snake 18 frog dragonfly mouse bird butterfly butterfly grass hopper housefly Count how many food chains there are in total in this food web. grasses aquatic plants terrestrial plants Food Web #4
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EXAMPLES OF FOOD WEBS
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EXAMPLES OF FOOD WEBS
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EXAMPLES OF FOOD WEBS
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ANALYZING A FOOD WEB 5 a) How many herbivores are there? b) How many
omnivores are there?
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ANALYZING A FOOD WEB 5 7 a) How many herbivores are there? b) How many
omnivores are there? c) How many carnivores are there? 7
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ANALYZING A FOOD WEB 5 7 3 a) How many herbivores are there?
b) How many omnivores are there? c) How many carnivores are there? 7 d) How many top carnivores are there? 3
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ANALYZING A FOOD WEB 5 7 3 1 a) How many herbivores are there?
b) How many omnivores are there? c) How many carnivores are there? 7 d) How many top carnivores are there? 3 e) How many food chains are the toads connected to? 1
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ANALYZING A FOOD WEB 5 7 3 1 3 a) How many herbivores are there?
b) How many omnivores are there? c) How many carnivores are there? 7 d) How many top carnivores are there? 3 e) How many food chains are the toads connected to? 1 3 f) How many food chains are the mice connected to?
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ANALYZING A FOOD WEB 5 7 3 1 3 6 a) How many herbivores are there?
b) How many omnivores are there? c) How many carnivores are there? 7 d) How many top carnivores are there? 3 e) How many food chains are the toads connected to? 1 3 f) How many food chains are the mice connected to? 6 g) How many food chains are the spiders connected to?
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ANALYZING A FOOD WEB 5 7 3 1 3 6 8 a) How many herbivores are there?
b) How many omnivores are there? c) How many carnivores are there? 7 d) How many top carnivores are there? 3 e) How many food chains are the toads connected to? 1 3 f) How many food chains are the mice connected to? 6 g) How many food chains are the spiders connected to? 8 h) How many food chains are the foxes connected to?
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ANALYZING A FOOD WEB 5 i) How many primary consumers are there?
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ANALYZING A FOOD WEB 5 6 i) How many primary consumers are there?
j) How many secondary consumers are there? 6
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ANALYZING A FOOD WEB 5 6 6 i) How many primary consumers are there?
j) How many secondary consumers are there? 6 6 k) How many tertiary consumers are there?
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ANALYZING A FOOD WEB 5 i) How many primary consumers are there? j) How many secondary consumers are there? 6 6 k) How many tertiary consumers are there? l) How many quaternary consumers are there? 4 Organisms in a food web can be one level of consumer in one food chain, but another level of consumer in another food chain in the same food web.
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ANALYZING A FOOD WEB 5 6 6 4 none i) How many primary consumers
are there? j) How many secondary consumers are there? 6 6 k) How many tertiary consumers are there? l) How many quaternary consumers are there? 4 none m) Which organisms are both primary and secondary consumers?
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spiders, insectivorous birds, snakes, foxes, hawks & owls
ANALYZING A FOOD WEB 5 i) How many primary consumers are there? j) How many secondary consumers are there? 6 6 k) How many tertiary consumers are there? l) How many quaternary consumers are there? 4 none m) Which organisms are both primary and secondary consumers? n) Which organisms are both secondary and tertiary consumers? spiders, insectivorous birds, snakes, foxes, hawks & owls
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foxes, hawks & owls, snakes, insectivorous birds
ANALYZING A FOOD WEB o) Which organisms are both secondary and quaternary consumers? foxes, hawks & owls, snakes, insectivorous birds
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ANALYZING A FOOD WEB foxes, hawks & owls, snakes, insectivorous birds
o) Which organisms are both secondary and quaternary consumers? foxes, hawks & owls, snakes, insectivorous birds p) Which organisms are both tertiary and quaternary consumers? snakes, insectivorous birds
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ANALYZING A FOOD WEB Since organisms are interconnected in an ecosystem, if one type of organism goes extinct, then this has effects on the other organisms in the food web.
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ANALYZING A FOOD WEB q) If the plants were to go extinct, explain the effect this would have on the primary consumers and the consumers above them. If the plants go extinct, this would deprive the primary consumers of food and they will decrease in numbers. This causes the secondary consumers to also decline because their food source is decreasing. This pattern moves up the entire food chain.
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ANALYZING A FOOD WEB r) If the rabbits were to go extinct, explain the effect this would have on the foxes and squirrels. If the rabbits go extinct, the foxes lose a food source, and they will consume more of their other food sources. Since the squirrels are one of the foxes’ other food sources, the squirrels will get eaten more and their numbers will decrease.
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ANALYZING A FOOD WEB s) If the hawks and owls were to go extinct, explain the effect this would have on the foxes, squirrels and plants. If the hawks and owls go extinct, the foxes will have less competition for prey and their numbers will increase. The consumers no longer preyed upon by the hawks and owls, like the squirrels, will increase in numbers and overpopulate. This will cause the primary consumers among them to eat too many of the plants which will cause them to decline. The loss of the producers signal trouble for the entire food web.
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ANALYZING A FOOD WEB t) If the insectivorous birds were to go
extinct, explain the effect this would have on the spiders and the toads. If the insectivorous birds go extinct, this causes the spiders to overpopulate because these birds are the spiders’ only predators. More spiders will then prey on the predaceous insects which will decrease their numbers. Since the toads’ only food source are the predaceous insects, the toads’ numbers will also decline.
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The End!
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