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Selection for Tuskless Elephants

Topic
  • Anatomy & Physiology
  • Zoology
  • Evolution
  • Natural Selection
  • Environmental Science
  • Conservation
Resource Type
  • Videos
  • Scientists at Work
Level
High School — GeneralHigh School — AP/IBCollege
Duration
00:06:39
Used In
1 BioInteractive Playlists
Favorited By
34 Users
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Description

This video follows Joyce Poole and other scientists working in Gorongosa National Park, Mozambique, who made the striking observation that many female elephants lack tusks.

Most African elephants have tusks, but some — about 2% to 6% of females and even fewer males — never grow them. Elephant tusks are important for obtaining food and water, and essential to male elephants for competing for mates, so one might expect strong natural selection for having tusks. But the proportion of tuskless elephants has increased in some populations.

In this video, Poole explains a possible reason. Elephants with large tusks are targeted by poachers, who sell the tusks on the ivory market. Poaching is selecting for tuskless elephants, which are more likely to survive, mate, and pass on their genes. In Gorongosa National Park, Poole found that among the older female elephants that survived a period of heavy poaching in the park, over 50% are tuskless. Among the younger females, who were born after this period of heavy poaching, 33% are tuskless. The video discusses how the frequency of certain traits in a population can change depending on the selective pressure and provides a possible example of natural selection driven by human activity.

An audio descriptive version of the film is available via our media player.

Details
Key Terms

Africa, adaptation, Gorongosa, microevolution, scientific methodology, scientific process, selective pressure, trait

Terms of Use

Please see the Terms of Use for information on how this resource can be used.

Accessibility Level

This resource complies with accessibility standards in accordance with the final rule for Section 508 of the National Rehabilitation Act.
Version History
Date Published 09.23.16
Date Updated 09.23.16
Curriculum Connections
NGSS (2013)

HS-LS4.B, HS-LS4.C

AP Biology (2019)

EVO-1, EVO-3

IB Biology (2016)

5.2

AP Environmental Science (2013)

II.C

IB Environmental Systems and Societies (2017)

3.2

Vision and Change (2009)

CC1, CC5

Materials
HD (M4V) 259 MB
HD (WMV) 210 MB
SD (M4V) 56 MB
SD (WMV) 57 MB
Transcript (PDF) 129 KB

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