The Study of Age-structured Populations: Survivorship

Our data most closely matches the type 1 survivorship curve. In the 19th and 20th centuries, the survivorship curves are both type 1 but survivorship is greater in the 20th century than in the 19th century. This could be due to the medical advances that were made in the 20th century such as the discovery of antibiotics in the 1930s. Biologically, humans tend to invest a lot of parental care into their offspring, which leads to the type 1 curve that we see. For both genders the survivorship curve is type 1, but the females have a far greater survivorship than the males. This may be because typically males are thought to do the harder and more dangerous work to provide for their families. Also historically, men die earlier than females.

            Another species that experiences age-structured population growth is the African bush elephant (Loxodonta Africana). Some forces that shape the life history of this species could be that the elephants live in packs in which all adults provide care and protection for the infants (Woodd 1999). This is because elephants in general are k-selected species, meaning that they give birth to few large offspring and invest a lot of parental care in their offspring.

Check out the rest this study

Quick Overview

Introduction

Methods

Results

Discussion

If you wish to write online and make money for it like I do you can join Triond using the link here or Bukisa here