Researchers Are Beginning a Study of a Field Mouse Population

question 4

Multiple Choice

Researchers are beginning a study of a field mouse population.To determine the best procedures to use for the mark-recapture method, they try different traps, baits, marking methods, and time intervals between first and second captures.In the first five trials, they have calculated these estimates of population size: 96, 172, 169, 168, and 174 mice.Which trial condition might account for the low estimate of 96 mice in the first trial?

• A) Marked mice avoided being captured a second time.
• B) Marked mice were unable to feed as well as unmarked mice.
• C) Predators targeted the marked mice more than the unmarked mice.
• D) The second capture took place before marked mice had completely mixed in.
• E) Many mice were able to enter and leave traps without being captured.

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