Biology HL Practical The "capture-mark-release-recapture" technique as a means of measuring population size

Apparatus: <Tab/>Large plastic tray <Tab/>Colored beads (2 colors) <Tab/>Sieve <Tab/>2 plastic beakers <Tab/>Hand shovel <Tab/>Sand Method: Fill a large plastic tray about ¾ full with sand from outside. Take two jars with two different color sets of beads and …

…to reach the bottom beads and also the sand would not be an obstruction to our results.<Tab/> We may also lessen the amount of sand placed in the box so that the beads are less difficultly mixed into it so they can be easily leveled out and not concentrated in one area. This would increase the randomness of our capturing which is necessary for the capture mark release recapture method.