Click and Learn “Survey Methods”

ABOUT THIS WORKSHEET

This worksheet complements the Click and Learn “Survey Methods

PROCEDURE

As you proceed through the interactive, follow the instructions and answer the questions in the spaces provided.

1.!Read the “Why Study Elephants” page and answer the following questions:

a.!Elephants are considered to be a keystone species. What does that mean?

b.!Name three elephant activities or functions that justify the term “keystone species” and describe how the activity changes African ecosystems.

c.!Why have elephant populations been declining for the past several decades?

Elephant activity Change in ecosystem

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www.BioInteractive.org Published December 2016 Page 2 Student Handout Click and Learn Survey Methods 2.!Biologists weigh the advantages and disadvantages of survey methods before choosing the appropriate approach. Read through each of the survey methods within the “Where are They” and “How Many” sections and use the table below to organize your thoughts.

Survey Type Information Gathered Methods used Type of count (Total or Sample/Direct or Indirect) Advantages Disadvantages Species Range

N/A

Individual Range

N/A

Aerial Survey

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www.BioInteractive.org Published December 2016 Page 3 Student Handout Click and Learn Survey Methods Individual Registration

Acoustic Surveys

Dung Transects

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www.BioInteractive.org Published December 2016 Page 4 Student Handout Click and Learn Survey Methods

3.!Read the “Population Change” section, watch the video and explore the map, then answer the

following questions:

a.!Turn on the 1979 and 2007 range layers on the map. Describe the change in the range. Where did the elephant range decrease, increase, or stay about the same?

b.!In 1979, the estimated elephant population was 1.3 million and in 2007 it was 640,000. By approximately what percentage did the elephant population decline over this time period?(Show your work.) How does this compare to the change in range over this same time period?

c.!Turn off the 1979 and 2007 range layers and turn on the 2016 trends layers. Based on the area surveyed, where are the major hotspots of elephant decline? Where are elephant populations stable or increasing?This study source was downloaded by 100000819946675 from CourseHero.com on 03-31-2021 04:53:10 GMT -05:00

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