Figure 6.4 Survivorship curveSurvivorship CurvesType DescriptionI. Late Loss Reproduction occurs fairly early in life. Most
deaths occur at the limit of biological life span.
Low mortality at birth; high probability of
surviving to advanced age. Death rates increase
during old age. Advances in prenatal care,
nutrition, disease prevention, and cures including
immunization have meant longer life spans for
humans. Examples: humans, annual plants,
sheep, and elephants.
II. Constant Loss Individuals in all age categories have fairly
uniform death rates. Predation affecting all age
categories is primary means of death. Typical of
organisms that reach adult stages quickly.
Examples: rodents, perennial plants, and
songbirds.