Mutualism Trophic level Parasitism Detrivore Energy pyramid Exponential growth F

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Mutualism Trophic level Parasitism Detrivore Energy pyramid Exponential growth Food chain Food welb Herbivore Heterotroph Carrying capacity Predation Primary productivity Producer , x; Competition Consumer Thinking Quwestions 1. Invasive species are species that are introduced into an environment but are not naturally found in that introduced into Britain at environment. One example of an invasive species is the American gray squirrel, the end of the 18th century. Until 1876 the only native squirrel in Britain was the European red squirrel, which was found in deciduous and coniferous forests. By 1940 the gray squirrel had displaced the red squirrel across most of the British isles, and by 1984 the red squirel was only found in isolated coniferous woodland areas. After its initial introduction, the gray squirrel population increased rapidly recent years population sizes within specific environments have become stable. in a. Explain why the newly-introduced gray squirrel initially showed rapid population growth and why the native red squirrel showed a population decline. 4. b. Why has the population size of the gray squirrel become stable in recent years? 2. The first age structuire graph below for country x shows the percent of the population in each age group for the year 2000. The remaining three graphs are projections of how the age structure of country X will change. From these age structure diagrams construct a graph of population size vs. time for 2000-2080 and justify your prediction. Age Structure for Country X Age 2000 2015 2045 080 71 801 1-70 41-50 31-40 21-30 11-20 5-10 andar b 75 50 25 25 075 75 so 2s 0a5 so 75 50 25 0 25 s0 252 Population (percon)

Explanation / Answer

1. a. When grey squirrel is introduced in Britain, it start competiting with red squirrel for the food and the shelter. Grey squirrel was able to use the resources more efficiently as compared to red one. Moreover, grey squirrel feed on variety of diet as compared to red one. Hence, the population of grey one increases and population of red one decreases.

b. The population size become stable after some years because it reaches the point Which is known as carrying capacity. It means it reach the population size that is environment can handle efficient lying.

3.a. population of P. caudatu is decreased because of the change in the growing condition.

b. P. caudatu was not efficient to utilize the available resources, hence it's population decreases whereas other bacteria do not get affected with this.

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