Population Estimation

A population of 559 birds had 12 deaths in the past year. 5 individuals immigrated into the population whereas 11 individuals emigrated elsewhere. Breeding season produced 34 offspring. Calculate the population change.

• 559

• 587

• 575

• 576

If a population experienced 5 births, 10 deaths, 5 immigrants and 3 emigrants, what was the starting population if the end population was found to be 1224?

• 1227

• 1224

• 1221

• 1222

A negative (B+I) - (D+E) value indicates:

• stable population

• the population is in decline

• the population has grown

• an error in calculation

Calculate the population change if a school of tuna experiences 554 births, 126 deaths, 51 immigrants and 12 emigrants.

• 478

• 0

• 445

• 467

Scientists captured and marked and released 189 dolphins. Next survey they captured 210 dolphins of which 23 were already tagged. Estimate the total dolphin population in the area.

• 2004

• 1879

• 1129

• 1725

A population of green sea turtles was surveyed with 23 individuals captured and tagged before being released. The next day, 31 turtles were captured of which 12 were already tagged. Calculate the overall population size.

• 59

• 57

• 61

• 54

Which of the following are assumptions of the lincoln index?

• All organisms have equal chance of being captured

• All organisms are motile and move in the population

• Marked individuals are randomly distributed after release

• The population is stable in terms of growth

The population size of whale sharks was known to be 128. The two surveys used to determine this involved capture of 56 sharks on the first capture and 71 on the second. Calculate the number of tagged sharks.

• 45

• 31

• 27

• 121