What is survivorship? Describe the three types of survivorship curves and give examples of each.

Name: Problem 3, Chapter 24: Biology
Uploaded: 2022-02-13T11:43:14-08:00
Duration: 1 min 25 s
Channel: Vivek Singh
Description: What is survivorship? Describe the three types of survivorship curves and give examples of each.

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What is survivorship? Describe the three types of...

Key Concepts

Survivorship

Survivorship refers to the proportion of individuals in a population that live to a certain age. It is a measure used in ecology and demography to understand the life span and mortality rates of organisms, which can be influenced by biological, environmental, and ecological factors.

Survivorship Curves

Survivorship curves are graphical representations that show the number or proportion of individuals surviving at each age for a given species or group. They help illustrate patterns of mortality and life history strategies across different populations and environments, forming a basis for comparative ecological and evolutionary studies.

Type I Survivorship Curve

The Type I survivorship curve is characterized by high survival rates throughout most of the life span, followed by a steep decline in survival at older ages. This pattern is typically observed in species with fewer offspring and high parental investment, where most individuals live to old age before experiencing a rapid increase in mortality.

Type II Survivorship Curve

The Type II survivorship curve shows a relatively constant mortality rate throughout the life span, meaning that the probability of dying is roughly the same at any age. This pattern can be observed in species where the risks of death are distributed uniformly across age classes.

Type III Survivorship Curve

The Type III survivorship curve is marked by very high mortality rates in early life, with a small proportion of individuals surviving to older ages. Species that exhibit this pattern often produce many offspring with little parental care, leading to high early-stage mortality but increased survival once individuals surpass vulnerable early life stages.

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