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Name Class Date Skills Worksheet TRACKING CICHLIDS Map Skills Answer Key 50 years perch It will decrease again by 50 percent. Houghton Mifflin Harcourt Publishing Company Holt McDougal Environmental Science i Understanding Populations Lake Victoria shown in the population map above is the largest lake in Africa and is home to fish called cichlids pronounced SIK-lids. In the 1950s a new fish the Nile Perch was introduced into Lake Victoria* This map shows the change in the cichlid population since the Nile Perch was introduced* Use the map above to answer the questions below. 1. Using a Key In which year was the number of cichlids the greatest 2. Using a Key How many years did it take for the cichlid population to decrease by 50 percent 3. Inferring Relationships Which fish in Lake Victoria do you think is higher on the food chain the cichlid or the Nile Perch Explain your answer. 4. Identifying Trends Based on the rate of decrease of cichlids shown on the map what do you think will happen to the cichlid population by 2050 Explain your answer. Houghton Mifflin Harcourt Publishing Company Holt McDougal Environmental Science i Understanding Populations Lake Victoria shown in the population map above is the largest lake in Africa and is home to fish called cichlids pronounced SIK-lids. In the 1950s a new fish the Nile Perch was introduced into Lake Victoria* This map shows the change in the cichlid population since the Nile Perch was introduced* Use the map above to answer the questions below. In the 1950s a new fish the Nile Perch was introduced into Lake Victoria* This map shows the change in the cichlid population since the Nile Perch was introduced* Use the map above to answer the questions below. 1. Using a Key In which year was the number of cichlids the greatest 2. Using a Key How many years did it take for the cichlid population to decrease by 50 percent 3. 1. Using a Key In which year was the number of cichlids the greatest 2. Using a Key How many years did it take for the cichlid population to decrease by 50 percent 3. Inferring Relationships Which fish in Lake Victoria do you think is higher on the food chain the cichlid or the Nile Perch Explain your answer. Inferring Relationships Which fish in Lake Victoria do you think is higher on the food chain the cichlid or the Nile Perch Explain your answer. 4. Identifying Trends Based on the rate of decrease of cichlids shown on the map what do you think will happen to the cichlid population by 2050 Explain your answer. Houghton Mifflin Harcourt Publishing Company Holt McDougal Environmental Science i Understanding Populations Lake Victoria shown in the population map above is the largest lake in Africa and is home to fish called cichlids pronounced SIK-lids. In the 1950s a new fish the Nile Perch was introduced into Lake Victoria* This map shows the change in the cichlid population since the Nile Perch was introduced* Use the map above to answer the questions below. 1. Using a Key In which year was the number of cichlids the greatest 2. Using a Key How many years did it take for the cichlid population to decrease by 50 percent 3.

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