Biology: Life on Earth with Physiology (11th Edition)
11th Edition
ISBN: 9780133923001
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: PEARSON
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Question
Chapter 27.5, Problem 1CSR
Summary Introduction
To determine:
Whether the elephant seals, regardless of their abundance should be considered as potentially endangered in the foreseeable future or not.
Introduction:
The population of elephant seal experiences both density-independent as well as density-dependent environmental resistances. The elephant seals are the almost genetically identical species and any adverse changes can affect the entire population to a similar degree.
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tion 15
EVOLUTION ASSESSMENT - FINCHES
Galápagos Ground Finches
Between 1973 and 1978, the population of ground finches (a type of small bird) on the Galápagos Islands
decreased. Scientists made observations of the population throughout that time period. They recorded
and graphed differences in the distribution of traits over time. The two sets of graphs below come from
the data they collected.
Beak Length for Ground Finches Observed in the Wet Seasons of 1973 and 1978
Wet 1973: all finches
# of finches
30
# of finches
25
20
15
10
5
0
30
25
20
15
10
5
12-01
0
$4.9
80-84
30.0-
11.5-11.9
Beak Length (mm)
Source: inquiryHub
35.0-39.9
40.0-44.9
12.5-12.9
13.0-13.4
13.5-13.9
14.0-
Wing Length for Ground Finches Observed in the Wet Seasons of 1973 and 1978
Wet 1973: all finches
65.0
Wing Length (mm)
Source: inquiryHub
70.0-74.9
# of finches
75.0-
30
25
# of finches
20
10
5
0
30
25
20
15
O
10
5
0
Wet 1978: all finches
7.0-74
7.5-7.9
80-8.4
85-80
9.0-94
9.5-9.9
10.0-1
30.0-34.9
10.5-10.9
11.0-11.4…
The Chatham Islands are about 850 kilometers off the coast of New Zealand. One species of bird living on the islands, the black robin (Petroica traversi), in 1980 there were only 5 individuals left. Currently, there are already 200 black robins living there: all from a single pair. Using the "fingerprint" method of blood cell DNA, it was proved that all the robins of this species are genetically identical according to the studied gene sequences. They thrive here today. Even 70 percent young survive. And on the continent, only 42% of young Petroica australis survive..
a) i) What can you say about the taxonomic links between the Chatam Islands and the mainland robins in terms of the scientific names of these birds? ii) What could have ever influenced the separation of the two robin populations?
Chapter 27 Solutions
Biology: Life on Earth with Physiology (11th Edition)
Ch. 27.1 - Prob. 1CSCCh. 27.1 - Prob. 1CYLCh. 27.1 - Prob. 1HYEWCh. 27.1 - The Return of the Elephant Seals Female elephant...Ch. 27.1 - Prob. 2CYLCh. 27.1 - Prob. 3CYLCh. 27.2 - Prob. 1CSCCh. 27.2 - Prob. 1CYLCh. 27.2 - Prob. 1TCCh. 27.2 - Prob. 2CYL
Ch. 27.2 - What factors might make these population data...Ch. 27.2 - Prob. 3CYLCh. 27.2 - What benefits does mass emigration give to animals...Ch. 27.3 - Prob. 1CYLCh. 27.3 - Prob. 2CYLCh. 27.4 - describe the three types of spatial distribution...Ch. 27.5 - Prob. 1CSRCh. 27.5 - describe the advances that have allowed...Ch. 27.5 - Prob. 1TCCh. 27.5 - explain why rapid population growth continues...Ch. 27.5 - Prob. 2TCCh. 27.5 - Prob. 3CYLCh. 27.5 - Prob. 3TCCh. 27.5 - Prob. 4CYLCh. 27 - Research a developing country (such as Nigeria,...Ch. 27 - Prob. 1FIBCh. 27 - Prob. 1MCCh. 27 - Prob. 1RQCh. 27 - Prob. 2ACCh. 27 - The type of growth that occurs in a population...Ch. 27 - Prob. 2MCCh. 27 - Prob. 2RQCh. 27 - Prob. 3FIBCh. 27 - Prob. 3MCCh. 27 - Draw, name, and describe the properties of a...Ch. 27 - Prob. 4FIBCh. 27 - Prob. 4MCCh. 27 - Prob. 4RQCh. 27 - Prob. 5FIBCh. 27 - Prob. 5MCCh. 27 - What is logistic population growth? What is K?Ch. 27 - Prob. 6RQCh. 27 - Distinguish between populations showing concave...Ch. 27 - Explain why environmental resistance has not...Ch. 27 - Prob. 9RQCh. 27 - Prob. 10RQ
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