Question

- Vista V tual School - 245782 - Three years ago, a 5 km?section of the Great Lakes was studied and approximately 89 000 zebra mussel colonies were found. Each colony produced 120 colonies over a three-year period. However, only 2% of the new colonies survived past the first year. Over the three years, there were 97 000 dead colonies that were washed ashore in the Great Lakes. Many of the zebra mussels attach themselves to hard surfaces, such as boats and trailers. It was estimated that approximately 85 000 colonies attached themselves to boats and left the area. Many of these zebra mussels died, but some managed to hitchhike on boat equipment and enter other waterbodies, Negligible numbers of zebra mussels migrated from other takes 11 Calculate the change in population size Show all your work and round your answer to the nearest whole number at of B I E E X x 를 들 .

Answer 1

Given Data:

5km³ contained 89000 zebra mussel colonies. Each colony produced 120 colonies.

So total number of colonies produced over three years= 89000 x 120 = 10680000 colonies

Only 2% of this colonies survived after 1st year. So total number of colonies survived = 10690000 x 2/100 = 213600 colonies

Total colonies washes away or died(Total death)= 97000 colonies

Total number of colonies attached themselves and left(Emigration)= 85000 colonies

So number of colonies remain= 213600-85000= 128600 colonies

1. Calculate the change in population size.

Answer: Change in population size(ΔN/Δt) = (Birth+Immigration) - (Death+Emigration) = (213600+0)- 97000-85000 = 31600 Colonies

2. Calculate the per capita growth rate over the three year period.

Answer: Per capita growth rate = ((G / N) * 100) / t, Where G= Change in size of the population, N= Initial Population, t= number of years

So per capita growth rate= ((31600/85000) x 100)/3 = 0.12

3. Calculate the population density in the end of the third year.

Answer: Population density is Dp= N/A

Where, N= total population survived, A= Area

population density is Dp= N/A= 128600/5km³ = 25720 colonies/ km³