Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332



Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem

Suppose 200 fish are marked and released in a pond. The following week, 200 fish are caught and 100 of them have marks. There are about ______ fish in this pond.

  1. a. 200
  2. b. 300
  3. c. 400
  4. d. 2,000

Summary Introduction

Concept introduction: The rise in number of individuals in a population is called population growth. The rate of population growth becomes more rapid in proportion to the growing total size of population. Population distribution is an arrangement of population in a particular area according to its conditions and requirements of the society. Demographics are the statistics used to describe population. Plot sampling are the methods mainly used for population size estimation.


Reasons for the correct statement:

Scientists use mark recapture sampling to estimate the population size. Using this technique, some number of animals in a population are captured, marked and then released. After allowing the marked individuals to meld back into the population, the scientists capture animals again. The proportion of marked animals in the second sample is taken to be representative of the proportion marked in the whole population. Characteristics of individuals in a sample plot or captured group can also be used to infer characteristics of the population as a whole.

This can be calculated by using the following formula:



The fishes tagged in catch is 100.

Total number of marked fishes in catch is 200.

The fishes marked in pond is 200.

To find: The total number of fishes in pond is x

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