Biological Science (7th Edition)
7th Edition
ISBN: 9780134678320
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Greg Podgorski, Emily Taylor, Jeff Carmichael
Publisher: PEARSON
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Chapter 23, Problem 11PIAT
Are toucans important to tropical forests?
Human activities are causing the fragmentation of the Brazilian Atlantic rain forest. One consequence is that toucans have become extinct or nearly extinct in some of the forest fragments. Does the absence of toucans affect the forest?
Toucans disperse seeds of key forest species such as juçara palms by eating the fruit and defecating the seeds in new locations, sometimes more than a kilometer away. If there are no toucans, is the genetic diversity of palms likely to increase or decrease within forest fragments (and why)?
a. increase (due to increased genetic drift)
b. decrease (due to decreased gene flow)
c. decrease (due to decreased mutation rate)
d. decrease (due to decreased natural selection)
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Students have asked these similar questions
Pine trees are coniferous trees native to most areas of the Northern Hemisphere. Pines produce seeds in the form of pine cones. In some species, pine cones open automatically upon maturation to release seeds. Other species rely solely on birds to break open the pine cones to disperse the seeds. In still others, a resin holds the pine cones closed until a forest fire melts the resin and the seeds can be released. What type of effect does a forest fire have on a pine tree population?
a) Obligate
b) Facultative
c) Density independent
d) Biotic
Logging appears to have negative consequences by causing an ecological trap for the woodpecker, the Yellow-bellied Sapsucker. Why?
The large and heavy seeds of the limber pine (Pinus flexilis) lack the wings on seeds characteristic of most pines. The seeds are the primary food source for Clark’s nutcracker which harvests seeds after the cones open. It then caches thousands of seeds each summer and fall in locations far from the original tree to eat later in the year. During years when many cones and seeds are produced, the nutcracker caches 3-5x the number of seeds actually eaten. When they are present, tree squirrels remove the cone before it opens before the seeds are fully developed, and will eat the seeds immediately or cache the cone for later consumption.
Question:
Scientists were interested to see whether the two seed harvesters would affect seed and cone traits. They compared cone and seed traits in areas that had nutcrackers but tree squirrels were either present or absent. Where squirrels were present, cone mass was larger but there were fewer seeds per cone, and smaller kernels per seed.
What do the…
Chapter 23 Solutions
Biological Science (7th Edition)
Ch. 23 - PROCESS OF SCIENCE In what sense is the...Ch. 23 - 2. Why isn’t inbreeding considered an evolutionary...Ch. 23 - 4. True or false? Gene flow can either increase or...Ch. 23 - 6. In the 1700s and 1800s, royalty in Europe often...Ch. 23 - MODEL Draw a small concept map (BioSkllls 12 )...Ch. 23 - 9. QUANTITATIVE In humans, albinism is caused by...Ch. 23 - Prob. 10TYPSSCh. 23 - Are toucans important to tropical forests? Human...Ch. 23 - QUANTITATIVE Toucans can eat fruits with large...Ch. 23 - 13. Do these data illustrate directional,...
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