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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

A K-selected species is likely to exhibit:

a. a Type I survivorship curve and a short generation time.

b. a Type II survivorship curve and a short generation time.

c. a Type III survivorship curve and a short generation time.

d. a Type I survivorship curve and a long generation time.

e. a Type II survivorship curve and a long generation time.

Summary Introduction

Introduction:

Survivorship curve is a graphical representation that shows the number of individuals surviving upto a particular age in a given group. There are three types of survivorship curves, namely, type-I, type-II, and type-III.

Explanation

The explanation for the correct answer:

Option (d) is given as a type I curve of survivorship and long generation time. In K-selected species, the rate of production of offsprings is relatively low and the population of these species is stable. The type-1 curve shows that the individual survives from the initial stage to the intermediate stage, but there is a decline in the number of individuals in the old age. The parents nourish their offspring well and therefore, the survival rate of offsprings increase from the initial to the middle stage. Hence, option (d) is correct.

The explanation for the incorrect answer:

Option (a) is given as type I survivorship curve and short generation time. The type I survivorship curve shows that the species of different ages are thirving from the early stage till the mid-stage. The generation gap is long in type I survivorship curve since species get enough resources for the nourishment of their offspring and the mortality rate only rises during the old age. So, it is incorrect.

Option (b) is given as type II survivorship curve and short generation time...

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