To estimate the number of tadpoles in the marshland, I would use the mark-recapture method. This involves capturing a sample of tadpoles, marking them in a harmless way, releasing them back into the marsh, and then recapturing another sample later on. By comparing the number of marked tadpoles in the second sample to the total number of tadpoles captured, I can estimate the total population size.
For the adult frog population, I would conduct visual surveys by walking through the marsh and recording the number of frogs I see. This method is less invasive and more practical for estimating the size of a dispersed population like adult frogs.
Using these methods will provide me with reliable estimates for both the tadpole and frog populations, allowing me to calculate the mortality rate accurately.
1. Your assignment as a biologist for the Ministry of Natural Resources is to estimate the number of tadpoles in a marshland, then the number of frogs later in the season to determine the mortality rate. Tadpoles are found only at the water's edge; adults throughout the marsh. Describe the method you would use to estimate the size of each population and give reasons for your choice of method.
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