As a member, you'll also get unlimited access to over 79,000 lessons in math, English, science, history, and more. Plus, get practice tests, quizzes, and personalized coaching to help you succeed.
Try it risk-freeAlready registered? Log in here for access
Lisa has taught at all levels from kindergarten to college and has a master's degree in human relations.
It is the hottest day of the year and your air conditioner quits working. The temperature in your house goes from a cool 72 degrees to 85 in a matter of hours. Since you are used to living in an environment that is much cooler, this difference is a hard adjustment. You could compare this situation to the way animals are affected by environmental change.
Any alteration of the normal state of an ecosystem is considered environmental change. Environmental change can be the result of natural causes, like when lightning causes a forest fire. It can also result from human causes like the destruction of a rainforest to create farmland. When an ecosystem is changed, the organisms that live in the ecosystem can have an even harder time adjusting to the change than you do to the loss of your air conditioning. They respond to this challenge by a process called adaptation.
An adaptation is a genetic change, or mutation, that makes the organism better able to survive in its new environment. These mutations are a normal part of the variation that exists in any population. Mutations can either be harmful, neutral, or beneficial. When one of these genetic changes is helpful, it will be passed down from one generation to the next until it becomes a typical characteristic of the organism. The mutation is now an adaptation.
Adaptations can be either structural or behavioral. A structural adaptation is a change to some physical part of an organism. A good example of this is the way plants called succulents have adapted to life in a hot, dry climate. As the plant's environment changed to that of a desert, the plants with mutations that allowed them to store extra water were better able to survive. Over time, all of the plants developed this adaptation.
A behavioral adaptation is a change to the way an organism behaves. Hibernation is one example of a behavioral adaptation. Animals that were unable to find enough food in the winter would often die. Animals with a mutation that allowed them to sleep through the winter living off of stored food increased their survival rate and passed the adaptation on to their offspring.
Remember, organisms do not change of their own accord. Instead, organisms in a population are born with a variety of traits. Environmental changes determine whether or not the adaptation of new traits will be beneficial to the survival of the species. This ability allows many organisms to survive the challenges of environmental change.
Some organisms have the ability to respond to environmental changes by evolving rapidly. The environmental selection of useful traits can be so biased that the process of adaptation is noticeable within only one generation. The shorter the life span of the organism, the quicker the change is passed to the entire population. Rapid adaptation such as this is called evolutionary rescue.
The adaptation of plankton to a recent increase in harmful algal blooms is a good example of evolutionary rescue. Plankton were not typically able to eat the harmful algae blooms. However, some of the plankton had a genetic variation that allowed them to tolerate the algae. The life span of plankton is only a few days. This allowed for rapid adaptation and within a few years the entire population of plankton was able to eat the algae blooms.
Environmental change is an alteration of the normal state of an ecosystem. It can be a result of natural causes or human causes and can create a challenging situation for the organisms that live in the ecosystem. Organisms often respond to environmental changes with adaptation, or a mutation that provides a better way for the organism to survive in the new environment. This genetic change is passed down to future generations until it becomes a typical characteristic of the organism. The rapid occurrence of adaptations is called evolutionary rescue.
Adaptations can be structural or behavioral. A structural adaptation is a change to a physical part of the organism. A behavioral adaptation is a change in the way the organism behaves. It is not the organism, but the environmental changes that determine whether or not an adaptation will occur. The normal variation of traits in a population is what gives the organisms the ability to survive environmental changes.
To unlock this lesson you must be a Study.com Member.
Create your account
Already a member? Log In
BackAlready registered? Log in here for access
Did you know… We have over 200 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.
To learn more, visit our Earning Credit Page
Not sure what college you want to attend yet? Study.com has thousands of articles about every imaginable degree, area of study and career path that can help you find the school that's right for you.
Back To Course
TExES Life Science 7-12 (238): Practice & Study Guide32 chapters | 257 lessons | 31 flashcard sets
{{courseNav.course.topics.length}} chapters | {{courseNav.course.mDynamicIntFields.lessonCount}} lessons | {{course.flashcardSetCount}} flashcard set{{course.flashcardSetCoun > 1 ? 's' : ''}}
Next Lesson
Watch 5 minute video clips, get step by step explanations, take practice quizzes and tests to master any topic.
Study.com has a library of 750,000 questions and answers for covering your toughest textbook problems
I love the way expert tutors clearly explains the answers to my homework questions. Keep up the good work!
- Maritess, College StudentStudy.com video lessons have helped over 30 million students.
"I learned more in 10 minutes than 1 month of chemistry classes"
- Ashlee P.
"I learned more in 10 minutes than 1 month of chemistry classes"
- Ashlee P.
"I aced the CLEP exam and earned 3 college credits!"
- Clair S.
Over 65 million users have prepared for {{displayNameByProductKey[registrationData.product || testPrepCocoon]}} and other exams on Study.com
"The videos have changed the way I teach! The videos on Study.com accomplish in 5 minutes what would take me an entire class."
- Chris F.
Over 65 million users have prepared for {{displayNameByProductKey[registrationData.product || testPrepCocoon]}} and other exams on Study.com
