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The mosquito Aedes albopictus, which was introduced from Asia to North America in the 1980 s,
is a public health concern because it can transmit diseases such as dengue fever. This species
breeds in small volumes of water, such as those in tree holes (cavities in trees that can hold water)
and in objects such as old tires. As it colonized these breeding habitats in North America, A.
albopictus encountered thriving populations of several different native species of mosquitoes.
Livdahl and Willey (1991) sought to predict the outcome of competition between A. albopictus and
the native mosquito A. triseriatus, a predominant member of tree hole communities. To do this,
they estimated competition coefficients and carrying capacities for A. albopictus and A. triseriatus
mosquito larvae developing in fluid obtained from tree holes and from tires. Their results are
shown in the table below: 1. We are going to designate A. triseriatus as species 1 and A.
albopictus as species 2. Use the data in the table to plot the zero isoclines for these two species
competing in tree hole communities. Predict the equilibrium population density (no. individuals
/100ml of fluid) for each species. Describe the likely outcome of competition between these two
species in tree hole communities. 2. On a separate graph, plot the zero isoclines for these two
species competing in tires. Predict the equilibrium population density (no. individuals /100ml of
fluid) for each species. Describe the likely outcome of competition between these two species in
tires.

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  • 1. The mosquito Aedes albopictus, which was introduced from Asia to North America in the 1980 s, is a public health concern because it can transmit diseases such as dengue fever. This species breeds in small volumes of water, such as those in tree holes (cavities in trees that can hold water) and in objects such as old tires. As it colonized these breeding habitats in North America, A. albopictus encountered thriving populations of several different native species of mosquitoes. Livdahl and Willey (1991) sought to predict the outcome of competition between A. albopictus and the native mosquito A. triseriatus, a predominant member of tree hole communities. To do this, they estimated competition coefficients and carrying capacities for A. albopictus and A. triseriatus mosquito larvae developing in fluid obtained from tree holes and from tires. Their results are shown in the table below: 1. We are going to designate A. triseriatus as species 1 and A. albopictus as species 2. Use the data in the table to plot the zero isoclines for these two species competing in tree hole communities. Predict the equilibrium population density (no. individuals /100ml of fluid) for each species. Describe the likely outcome of competition between these two species in tree hole communities. 2. On a separate graph, plot the zero isoclines for these two species competing in tires. Predict the equilibrium population density (no. individuals /100ml of fluid) for each species. Describe the likely outcome of competition between these two species in tires.