1)Based on the given data, come up with (and write down) a hypothesis that might explain the range expansion of this species between 1850 and 2000? Discuss how you arrived at this hypothesis based on available data.

Concepts of Biology
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Author:Samantha Fowler, Rebecca Roush, James Wise
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Chapter19: Population And Community Ecology
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1)Based on the given data, come up with (and write down) a hypothesis that might explain the range expansion of this species between 1850 and 2000? Discuss how you arrived at this hypothesis based on available data.
3. The Christmas Island red crab, Gecarcoidea natalis, is a species of terrestrial crab endemic to
Christmas Island in the Indian Ocean. Given below are population sizes (the Y axes) of different
organisms in Christmas Island over the years (1800-2010).
Red Crab
Maclear's Rat
120000
1400
100000
1200
1000
80000
800
60000
600
40000
400
20000
200
1750
1800
1850
1900
1950
2000
2050
1750
1800
1850
1900
1950
2000
2050
Human Beings
Yellow crazy Ant
1200
70000
60000
1000
50000
800
40000
600
30000
400
20000
200
10000
1750
1800
1850
1900
1950
2000
2050
1750
1800
1850
1900
1950
2000
2050
b.
a. Looking at the data in the different graphs above, provide one hypothesis that might explain
the sudden population explosion of Red crabs in Christmas Island around 1900?
þ. Based on the data what could be one possible ecological relationship between red crab and
Maclear's rat that would explain the patterns in population size over time? Between red crab
and yellow crazy ant?
Transcribed Image Text:3. The Christmas Island red crab, Gecarcoidea natalis, is a species of terrestrial crab endemic to Christmas Island in the Indian Ocean. Given below are population sizes (the Y axes) of different organisms in Christmas Island over the years (1800-2010). Red Crab Maclear's Rat 120000 1400 100000 1200 1000 80000 800 60000 600 40000 400 20000 200 1750 1800 1850 1900 1950 2000 2050 1750 1800 1850 1900 1950 2000 2050 Human Beings Yellow crazy Ant 1200 70000 60000 1000 50000 800 40000 600 30000 400 20000 200 10000 1750 1800 1850 1900 1950 2000 2050 1750 1800 1850 1900 1950 2000 2050 b. a. Looking at the data in the different graphs above, provide one hypothesis that might explain the sudden population explosion of Red crabs in Christmas Island around 1900? þ. Based on the data what could be one possible ecological relationship between red crab and Maclear's rat that would explain the patterns in population size over time? Between red crab and yellow crazy ant?
2. Given below is a map of two islands (islands A and B) and the population sizes of a bird species on
these two neighboring islands between the years 1850 and 2000. During this time other factors that
could influence the distribution of this bird, such as population sizes of predators, annual rainfall, and
temperature, did not change.
Island A
Island B
10 km
3500
3000
2500
2000
Island A
1500
Island B
1000
500
1850
1900
1950
2000
Year
Population of Birds
Transcribed Image Text:2. Given below is a map of two islands (islands A and B) and the population sizes of a bird species on these two neighboring islands between the years 1850 and 2000. During this time other factors that could influence the distribution of this bird, such as population sizes of predators, annual rainfall, and temperature, did not change. Island A Island B 10 km 3500 3000 2500 2000 Island A 1500 Island B 1000 500 1850 1900 1950 2000 Year Population of Birds
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