6. Which of the following is an example of collecting index data as a proxy?a) Listening to bird calls to calculate species richnessTaking a blood sample of a sick birdCounting the number of nests in a tree instead of birds, to estimate population sized) Counting all birds in a tree by casting a net around the entire treee) None of the above
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Which of the following techniques would provide the most accurate data on population density? a. Calculate the difference between all of the immigrants and emigrants to see if the population is growing or shrinking. b. Count the number of pine trees in several randomly selected 10-meter-square plots within a population, and extrapolate this number to the fraction of the study area these plots represent. c. Count the number of nests of a particular species of songbird and multiply this by a factor that extrapolates these data to actual animals. d. Use the mark-recapture method to estimate the number of individuals in the population.
Sri K.
Which of the following examples would most accurately measure the density of the population being studied? A. counting the number of moss plants in 1-square-meter quadrants B. counting the number of times a 1-kilometer transect is intersected by tracks of red squirrels after a snowfall C. counting the number of prairie dog burrows per hectare D. counting the number of coyote droppings per hectare E. counting the number of zebras from airplane census observations.
Md.Daniyal A.
In a wildlife survey, an area of desert land was divided into 1000 squares, or "quadrats," a simple random sample of 50 of which were surveyed. In each surveyed quadrat, the number of birds, $Y,$ and the area covered by vegetation, $X$ were determined. It was found that $$\begin{aligned}\sum X_{i} &=3000 \\\sum & Y_{i}=150 \\\sum X_{i}^{2} &=225,000 \\ \sum Y_{i}^{2} &=650 \\\sum X_{i} Y_{i} &=11,000\end{aligned}$$ a. Estimate the ratio of the average number of birds per quadrat to the average vegetation cover per quadrat. b. Estimate the standard error of your estimate and find an approximate $90 \%$ confidence interval for the population average. c. Estimate the total number of birds and find an approximate $95 \%$ confidence interval for the population total. d. Suppose that from an aerial survey, the total area covered by vegetation could easily be determined. How could this information be used to provide another estimate of the number of birds? Would you expect this estimate to be better than or worse than that found in part (c)?
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