Dallas, Texas had an outbreak of West Nile virus, a
virus spread by mosquitos, in 2012. In 2012, the mosquito
population increased dramatically. What are the limiting factors
for these mosquitos? What changed in Dallas between 2011 and
2012?
A sample answer should include the
following:
Limiting factors for this population:
Food source
Temperature
Mates
Space
Differences in Dallas between 2011 and 2012:
2012 was very hot in the Dallas area compared to
2011.
In 2012, Dallas had a drought, while the area had
more rain in 2011.
Answer) Limiting factors for this population:
Food source- Blood of humans and birds.
Temperature- It survives in higher temperatures. Short winter was there in the year 2011 which helps in the dramatic growth of vector mosquitoes in 2012 summers.
Mates- It reproduces round the year.
Space- It can breed in stagnant water in warm conditions specially in the septic tanks. More rainfall in 2012 helped in creating more breeding grounds for the mosquitoes.
Differences in Dallas between 2011 and 2012:
2012 was very hot in the Dallas area compared to 2011.
In 2012, Dallas had a drought, while the area had more rain in 2011.
There was a very short winter in the year 2011 that causes the higher production of vector species in the following year when the temperature rose in 2012. All the conditions were favorable for the production of a large number of mosquitoes species that carry West Nile virus which caused the outbreak of the disease in 2012.
Dallas, Texas had an outbreak of West Nile virus, a virus spread by mosquitos, in 2012....
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