Relationships between populations

REL ATIONSHI PS BETWEEN POPUL ATIONS 7TH GRADE SCIENCE 3 MAIN RELATIONSHIPS Symbiosis Predation (Predator/Prey) Competition OUR GOAL FOR SYMBIOSIS IS TO ANSWER THESE QUESTIONS:

What is symbiosis? What are the different kinds of symbiosis? What are some examples of symbiosis? SYMBIOSIS What it means: Two organisms that live together Temporarily or for a longer time At least one of the organisms benefits from the relationship W H AT A R E T H E

DIFFERENT KINDS OF SYMBIOSIS? Mutualism Commensalism PA R A S I T I S M both organisms benefit one organism

benefits one organism is unaffected one organism benefits one organism is harmed Mutualism Organism One

Organism Two Commensalism Organism One Organism Two Parasitism Organism One Organism Two

Acacia Plant & Ants The ants lay eggs on acacia tree so they get a nice safe place for their eggs. The acacia covers the infected area with brown flesh (called a gall.) The plant has to use valuable resources to create the gall.

What symbiotic relationship is this? parasitism Loa Loa Worm & Human This worm infects human the blood stream and gets a nice warm safe home there. The

human may go blind or have other complications as a result. What symbiotic relationship is this? parasitism P R E D AT O R - P R E Y R E L AT I O N S H I P S

Predation - (Predator/Prey) Learning Objectives Be able to describe the relationship between predators and their prey. Animals that eat other animals Populations of animals are often limited by the amount of food. What are animals that eat other animals called?

predators What are the animals that predators eat called? prey To do: Define the words Predator and Prey and give an example of each. Prey Adaptations General Prey have adaptations to detect and prevent being eaten by predators.

venomous coral snake mimicry speed & keen senses camouflage warning colors & patterns

scarlet kingsnake Predator Adaptations General Predators have adaptations to catch and consume their prey. birds of prey have keen eyesight and sharp beaks and talons camouflage allows predators

to blend in with their surroundings treefrogs have special pads on their feet so they can cling to venomous snakes have poisonous venom to subdue their prey

kingsnakes are immune to the venom of venomous snakes Can you find the camouflaged predators? 1 3

2 4 8 7 6 5 WHAT IS All living things need natural resources, but the

COMPETITION? problem is that there is not enough for everyone. This means that individuals have to fight for them in order to survive. This struggle for resources is called competition. WHO COMPETES? Competition for resources between members of different species is

called interspecific competition. Competition for resources between members of the same species is called intraspecific competition. Different species = Interspecific Same species = Intraspecific

WHAT DO ANIMALS COMPETE FOR? There are four resources for which animals compete. What are they? food water mates land (territory) Which resource is not relevant for interspecific

competition? Members of different species will not compete for mates. WHAT DO PLANTS COMPETE FOR? Competition between plants may be less noticeable than competition between animals but it still takes place. What four things do plants compete for? light water minerals space