Total Number of Tree Snails (N) 500 300 200 8888888 700 600 400 100 0 1997 1999 2001 2003 2005 Year 2007 2009 2011 2013 Figure 2. Achatinella lila captive population growth after its founding in 1997 with seven snails. The population peaked in 2009 with 668 snails and declined to less than 200 snails by 2013. Why does the population of tree snails experience a drop after the initial increase? 000 snails were not adapted to living in captivity authors attribute the increase of genetic diversity to the population drop a viral infection decimated the snail population in 2009 and consecutive years a genetic bottleneck led to reduced genetic diversity and fecundity
Total Number of Tree Snails (N) 500 300 200 8888888 700 600 400 100 0 1997 1999 2001 2003 2005 Year 2007 2009 2011 2013 Figure 2. Achatinella lila captive population growth after its founding in 1997 with seven snails. The population peaked in 2009 with 668 snails and declined to less than 200 snails by 2013. Why does the population of tree snails experience a drop after the initial increase? 000 snails were not adapted to living in captivity authors attribute the increase of genetic diversity to the population drop a viral infection decimated the snail population in 2009 and consecutive years a genetic bottleneck led to reduced genetic diversity and fecundity
Chapter40: Population Ecology
Section: Chapter Questions
Problem 4SA
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Transcribed Image Text:Total Number of Tree Snails (N)
500
300
200
8888888
700
600
400
100
0
1997
1999
2001
2003
2005
Year
2007 2009
2011
2013
Figure 2. Achatinella lila captive population growth after its founding in 1997 with seven snails. The
population peaked in 2009 with 668 snails and declined to less than 200 snails by 2013.
Why does the population of tree snails experience a drop after the initial increase?
000
snails were not adapted to living in captivity
authors attribute the increase of genetic diversity to the population drop
a viral infection decimated the snail population in 2009 and consecutive years
a genetic bottleneck led to reduced genetic diversity and fecundity
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