#SURVIVORSHIP CURVES COURSENOTES BIOLOGY DOWNLOAD#

United States of America: Brooks/Cole, 2001. Download this Biology 2483A class note to get exam ready in less time Class note uploaded on Nov 22, 2012. Biology: The Unity and Diversity of Life. When a type III curve is plotted, it is concave up the rate of death decreases over time.Ĭecie Starr and Ralph Taggart. Many species considered to be pests have type III curves. These species have adapted to reproduce and spread to new habitats very rapidly. Large brood sizes, little to no parental care, and rapid population are all characteristic of species with type III survivorship curves. Type III A type III curve represents a species which has a high death rate early in life. Graphically, it looks like a straight line with a negative slope.

Examples of species with type II curves are coral, certain small mammals, and many species of reptiles. Type II A type II curve shows an equal death rate throughout the life of an organism. When graphed, a type I curve is concave down, there is a low rate of death early on, but a high rate later. Species with type I curves have adapted to exploit specific aspects of their environment to increase the c arrying capacity, thus, it is not surprising that many type I species are endangered. Type I organisms have small brood sizes and will take great care of their young. We find type I survivorship curves in large mammals.

It is not until later that organisms start to die. Type I A type I curve signifies a high rate of survivorship early in life. Generally, a species will have one of three types of survivorship curves. This cohort is then graphed with the number of surviving individuals on the y-axis and the age of the cohort on the x-axis. In making a survivorship graph, a cohort is used in this case, a group of individuals who were born at roughly the same time. A survivorship curve is a graph of the survival rate of a group of organisms.

Survivorship curves coursenotes biology