Chapter 12.8, Problem 2MC

Summary Introduction

To draw:

A graph that would be formed if the information from the second half of the experiment is added to the graph of fig: 12.22a “over four generations, the average fish in the large-harvested population weighted much less than those in the small-harvested populations” of chapter 12 “the evolution of life” given in the textbook.

Concept Introduction:

David Conover and Stephan Munch are fish ecologists who studied on small coastal fish (Atlantic silverside) tested on the above predictions. They took a large enslaved population of coastal silversides and randomly divided them into six tanks. Each tank contained approximately juveniles. After six months, they took two tanks for the treatment that are as follows:

• Large-scale harvested: In this treatment, the 90% fish were removed from the tank and 10% smallest fish remained.
• Small-scale harvested: In this step, 90% smallest fish were removed.
• Random-harvested: In this step, 90% fish were removed without any size consideration.