Concept explainers
To review:
The type of species interaction that appears to have caused aphid population to fluctuate in size in the Figure 1, and the type of species interaction that keeps the
Given:
The fluctuation in population of Aphis glycines (soybean aphids) is more when its predator, Orius insidiosus (insidious flower bug), is excluded from environment. When the predator is present then fluctuation in aphids’ population is less. This information is represented in the following Graph 1:
Graph 1: Fluctuations in population of Aphids and their predators.
Introduction:
Population of some organisms differs over time and some show very fast life cycle. In population that has very fast life cycle, fluctuation in its population occur within a few minutes or days. The highly fluctuating species responds to changes that occur in their
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Life: The Science of Biology
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- Define the term persecuted species. Describe at least three persecuted species that live in the United States.arrow_forwardAre the following statements True or false? 1) Population growth of many species is expected to be either exponential or geometric, unless some factor such as competition or predation is introduced. 2) The age distribution of populations reflects the influence of per capita rates of births, death, immigration, and emigration.arrow_forwardFor each organism, create a survivorship curve by plotting the given information in a line graph. Title each graph "Survivorship Curve for [name of organism]." The y-axis should be labeled "Survivorship" and contain low, medium, and high indicators. The x-axis should be labeled "Life Span" and contain young, middle-aged, and old indicators. American toads practice explosive reproduction. During the first warm days in spring, both males and females migrate from forests and converge on ponds. Reproduction is quick, taking only a few days. Females lay hundreds of eggs in jelly-filled sacks along the sides of the pond or stream. As soon as the eggs are laid, males and females abruptly leave the pond. Even before they hatch, the offspring are prone to high rates of predation. Many offspring die before they reach adulthood. Of the offspring that do survive, some will die in adulthood, and some will live their entire natural life span.arrow_forward
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