VOLUME 1: Table of Contents
TEACHING ISSUES AND EXPERIMENTS IN ECOLOGY
TEACHING
ALL VOLUMES
SUBMIT WORK
SEARCH
Figure Set 3: Brown Tree Snakes and Bird Extinctions on the Island of Guam
Purpose: To help students understand the impact of snakes and other introduced predators on island fauna.
Teaching Approach: "guided class discussion"
Cognitive Skills: (see
Bloom's Taxonomy) — knowledge, comprehension, application, synthesis, analysis
Student Assessment: rebuttal essay
FIGURE SET 3
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Figure 3.
Predation by snakes on birds in traps exposed for up to 14 days in 7 different sites on the island of Guam and comparison
locations. In the NCS, NWF, and Naval Mag. sites, birds were extinct or rare. In the Ritidian and AAFBF sites, birds were
declining. In the Coos Island and NASA sites birds were stable. Once the bait was preyed on, it was not replaced.
The number of traps ranged from 15-30 at the different sites. Predation by rats and lizards were exluded. (from Savidge,
J. A. 1987. Extinction of an island forest avifauna by an introduced snake. Ecology 68: 660-668).
For help, see the essay "Helping Your Students to Interpret Figures and Tables."
Figure 3.
Predation by snakes on birds in traps exposed for up to 14 days in 7 different sites on the island of Guam and comparison
locations. In the NCS, NWF, and Naval Mag. sites, birds were extinct or rare. In the Ritidian and AAFBF sites, birds were
declining. In the Coos Island and NASA sites birds were stable. Once the bait was preyed on, it was not replaced.
The number of traps ranged from 15-30 at the different sites. Predation by rats and lizards were exluded. (from Savidge,
J. A. 1987. Extinction of an island forest avifauna by an introduced snake. Ecology 68: 660-668).
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