How Do Living Things Affect One Another?
Ch. 14.3 Ms. De Los Rios 7th Grade Essential Question: How Do Living Things Affect One Another? How Do Adaptations Help an Organism Survive? What Are Competition and Predation? What are Three Types of Symbiosis? Interactions Among Living Things Pgs Vocabulary Natural Selection- The process by which organisms that are best adapted to their environment are most likely to survive and reproduce Adaptation- An inherited behavior or physical characteristic that helps an organism survive and reproduce in its environment Niche- How an organism makes its living and interacts with the biotic and abiotic factors in its habitat Competition- The struggle between organisms to survive as they attempt to use the same limited resources in the same place, at the same time. Parasite- The organism that benefits by living with, on, or in a host in a parasitism interaction. Host-An organism that a parasite lives with, in, or on, and provides a source of energy or a suitable environment for the parasite to live. Vocabulary Symbiosis- Any relationship in which two species live closely together and that benefits at least one of the species. Mutualism-A type of symbiosis in which both species benefit from living together. Commensalism- A type of symbiosis between two species in which one species benefits and the other species is neither helped or harmed. Parasitism- A type of symbiosis in which one organism lives with, on or in a host and harms it. Predation-An interaction in which one organism kills another for food or nutrients. Predator-The organism that does the killing in a predation interaction. Prey- An organism that is killed and eaten by another organism in a predation interaction. My Planet Diary pg. 490 Predator Power
What predator can close its jaws the fastest? You might think it is a lion or a shark, but you would be wrong. It is the trap-jaw ant that has the fastest predatory strike in the animal kingdom. The trap-jaw ant closes its mouth around its prey in 0.13 milliseconds at speeds of 35 to 64 meters per second! The force created when its jaw snaps shut also helps the ant escape danger by either jumping up to 8.3 centimeters high or 39.6 centimeters sideways. How does the trap-jaw ants adaptation help it avoid becoming the prey of another organism? 2. What are some adaptations that other predators have to capture prey? How Do Adaptations help an Organism Survive? Pg. 491
As day breaks, a sound comes from a nest tucked in a branch of a saguro cactus. Two young red-tailed hawks are preparing to fly. Farther down the stem, a tiny elf owl peeks out of its nest in a small hole. A rattlesnake slithers around the base of the saguaro, looking for breakfast. Spying a shrew, the snake strikes it with needlelike fangs. The shrew dies instantly. Natural SelectionPg. 492 Individuals with characteristics that Are best suited for their environment tend to Survive and pass on these Characteristics to their offspring through a process called natural selection. The behaviors and characteristics that allow organisms to live successfully in their environments are called adaptations. Individuals with characteristics that are poorly suited for their environment are less likely to survive and reproduce. Over time, poorly suited characteristics may disappear from the species. If a species cannot adapt to changes in its environment, the entire species can disappear from Earth and become extinct. Saguaro Community fig. 1 pg. 491
DESCRIBE Circle two examples ofhow organismsinteract in this scene.Describe each one. Niche Pg. 492 An organism has a role, or niche, in its habitat. The organisms in the saguaro community have adaptations that result in specific roles. The role an organism has in its habitat is called its niche. A niche includes the type of food the organism eats and how it gets this food. A niche also includes when and how the organism reproduces and the physical conditions that it needs to survive. Each organism has unique characteristics that affect the organisms ability to survive and reproduce in its environment. Organisms occupy many niches in an environment.
Apply it! Identify- List two abiotic factors in the picture. Interpret Diagrams- Describe the niche of the squirrel in the picture. 3. Make generalizations- What adaptations might the squirrel have that make it able to live in this environment. Assess Your Understanding pg. 492
1a. Define Adaptations are the__________________ and ______________________ characteristics that allow organisms to live successfully in their environments. b. Explain -How are a snakes sharp fangs an adaptation that help it survive in the saguaro community? __________________________________________________________________________________________________________________ I get it! Now I know that adaptations are __________________________________________________________________________________________________________________ What is Competition? Pg. 493 Competition is the
Two major types of interactions among organisms are competition and predation. Competition is the struggle between organisms to survive as they attempt to occupy the same niche and use the same limited resources. Organisms that share the same habitat often have adaptations that reduce competition. For example, three types of birds can each get food from different parts of the same tree. Predation pg. 494 PredationAn interaction is which one organism kills another for food. The predator The species that hunts and kills the prey. The prey The species that is hunted or killed. -Predators have adaptations that help them catch prey. -Organisms have adaptations that help them avoid becoming prey. Predators can affect population size. If there are too many predators in an area, the number of prey will decrease. As a result, there is less food for predators and the predator population will go down too. Niche and Competition Fig. 2 pg. 493
Each of these warbler species occupies a very specific location in its habitat. By feeding on insects in different areas of the tree, the birds avoid competing for food and are able to live together. Predict- What could happen if these warbler species fed in the same location on the tree? List- For what resources do the tree and the grass compete? Predator Adaptations pg. 495
Predators have adaptations that help them catch and kill their prey. A cheetah can run very fast for a short time, enabling it to catch its prey. Some predators, such as owls and bats, have adaptations that enable them to hunt at night when their prey are active. Fig. 4pg. 494 A jellyfishs tentacles contain a poisonous substance that paralyzes tiny water animals. The sundew is a plant that is covered with sticky bulbs on stalks. When a fly lands on a bulb, it remains snared in the sticky goo while the plant digests it. Imagine an ideal predator to prey on a porcupine. Draw or describe your predator and label its adaptations. Organisms have many adaptations that help them avoid becoming prey.
Prey Adaptations pg. 495 Organisms have many adaptations that help them avoid becoming prey. False Coloring- Predators may be confused by a false eyespot and attack the wrong end of the animal. This allows the animal to get away safely. Prey Adaptations Warning Coloring
Many brightly colored animals are poisonous and their bright colors warn predators not to eat them! Mimicry Animals often mimic the coloring, shape, and swimming style of venomous animals to discourage predators. Protective Covering Some animals have a hard shell covering to prevent being eaten by predators. Camouflage Some animals and insects, use coloring to help them blend into their surroundings. Predator-Prey Interactions
On Isle Royale, an island in Lake Superior, the populations of wolves (the predator) and moose (the prey) rise and fall in cycles. Use the graph to answer the questions. Read Graphs- What variable Is plotted on the x-axis? What two variables are plotted on the y-axis?______________________ 2. Interpret Data- How did the moose Population change between 2002 and 2007 2007? What happened to the wolf population from 2003 through 2006?________________ _____________________________________ 3. Draw conclusions- How might the change in moose population have led to the change in the wolf population? ___________________ 4. Explain- What adaptations does a wolf have that makes it a successful predator? _______ 5. Predict- How might disease in the wolf population one year affect the moose population the next year?_________________ Assess Your Understanding pg. 496
2a. Review - Two main ways in which organisms interact are ___________________ and _____________________. b. Describe Give an example of competition. Explain your answer. ______________________________________________________________________________________________________________ c. Apply concepts Owls often prey on mice. What adaptations do you think the mice have that help them avoid becoming prey? I get it! Now I know that competition and predation _______________________________________________________________________________________________________________ What Are The Three Types Of Symbiosis?pg. 497
The 3 main types of symbiotic relationships are 1. Mutualism Commensalism 3. Parasitism Mutualism Mutualism is a relationship in which both species benefit. When an oxpecker eats ticks living on the impalas ear, both organisms benefit. Commensalism Commensalism is a relationship in which one species benefits and the other species is not affected, such as a birds nest in a tree. Parasitism Parasitism is a relationship in which one organism benefits and the other organism is harmed. The organism that benefits is called a parasite. The organism that is harmed is called the host. Fish lice are parasites that feed on the blood of a host fish. List the names of the parasites and the hosts.
Fig. 7 pg. 498 List the names of the parasites and the hosts. Assess Your Understanding pg. 499
3a. Compare and contrast Identify two types of interactions among organisms and then compare and contrast them. __________________________________________________________________________________________________________________ b. How do living things affect one another? I get it! Now I know that the three types of symbiosis differ in