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© Boardworks Ltd of 6
© Boardworks Ltd of 6 Predators and prey A predator is an animal that hunts and kills other animals for food. The animal that is eaten is the prey. The size of the two populations are very closely linked. Why do you think this is? For example, lynxes are a type of wild cat that hunt snowshoe hares in northern parts of North America.
© Boardworks Ltd of 6 Predator-prey populations
© Boardworks Ltd of 6 Prey population changes The hare population follows a cyclical pattern, where it rises and falls in a fairly regular cycle. Why is this? Individual hares must compete for food and mates, and must also avoid being killed by lynxes, their predators. The hare population changes due to both the vegetation growing season and changes in the lynx population.
© Boardworks Ltd of 6 Predator population changes The lynx population also follows a cyclical pattern very similar to the hare population. Why is this? The lynx is very dependent on hares for food, so as the hare population changes so does the lynx population. This is why the lynx population rises and falls slightly after the rise and fall of the hare population.
© Boardworks Ltd of 6 Predator-prey cycles
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© Boardworks Ltd of 33 Compete or Die B2d. © Boardworks Ltd of 33 What do organisms compete for?
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© Boardworks Ltd of 24 KS4 Biology Competition.
1 of 38© Boardworks Ltd 2008 Feeding relationships.
Contents Competition What is competition? Competition between animals Predator–prey relationships Multiple-choice quiz Competition in plants.
Predator-Prey Cycles Control of Population Size. Charles Elton (on the right) Studied living organisms in relation to their natural environment, or ECOLOGY.
1. Predator Prey Relationships Be able to describe the relationship between predators and their prey. Be able to explain the shape of a predator – prey.
Hare and Lynx. Organism Populations Change Over Time Populations are always changing. Sometimes changes are the result of humans interfering with food.
The Predator-Prey Relationship. Part 1: The Meaning & Predicting With your tablemates, discuss the information in part 1 Define the terms Complete the.
THE CANADIAN LYNX BY OMAR ELSEKELY. WHAT IS THE LYNX’ HABITAT? BOREAL FOREST BELT OF NORTH AMERICA CANADA FROM NEWFOUNDLAND TO THE YUKON TERRITORY ALASKA.
6.1 Relationships in the Ecosystem. Predators and Prey Predator= A consumer that actively hunts other living organisms. Prey= The organism that a predator.
SCIENCE 4th Grade – Adaptations 4.6, 4.8, 4.9, 4.10, 4.11 North East Independent School District A Tradition of Excellence.
Food Chains and Ecosystems. Meadow Ecosystem Food Chain The hawk is a predator. It hunts and eats other animals. The mouse is prey for the hawk. Prey.
AN ECOSYSTEM IS A COMMUNITY (all organisms) PLUS ABIOTIC FACTORS POPULATIONS AND RESOURCES FLUCTUATE AT A PREDICTABLE RATE OVER TIME.
Vocabulary and pictures. A group of organisms of one kind that live together in one location.
Bell Ringer Label each graph as either LOGISTIC GROWTH or EXPONENTIAL GROWTH. Label each graph as either LOGISTIC GROWTH or EXPONENTIAL GROWTH. A B.
Interactions among Living Things. Populations There is a limit to the number of organisms (population) that an ecosystem can support based on different.
Measuring Populations. Introduction If you had one male and one female elephant in the wild They would reproduce every so often and have a baby elephant.
Energy Flow and Pyramids of Numbers Science - Chapter 2.
1 of 9 © Boardworks 2011 Food Chains To enable the animations and activities in this presentation, Flash Player needs to be installed. This can be downloaded.
AIM: What are symbiotic relationships? DN: Define a predator/prey relationship. What determines the population size of each?
Ecology Ch 6 Ecosystem Balance. Ch 6 Intro Ecosystems are a combination of biotic and abiotic factors Each part works like a part in a machine All play.
Predation Species A hunts and is a predator of Species B –Predator – is the animal that hunts –Prey – is the animal that is hunted.
OH DEER A non-technological model for species survival and predator/prey interactions.
Chapter 2. Commensalism Host Mutualism Parasites Parasitism Symbiosis Predator Prey Predator and Prey.
Many decades, huge area – spatially and temporally extensive cycling.
WHAT IS A HABITAT?. WHERE AN ANIMAL LIVES WHAT IS A PREDATOR? WHAT IS PREY? A predator is an animal that lives by killing and eating other animals. Prey.
By 4C Candy Chan. P.1 Introduction P.2 What does lynx eat? P.3 Where does lynx live? P.4-5 Lynx ’ s pictures p.6 My impressions.
Predicting predator-prey populations. Desired results.
1 Aim: How does competition affect organisms in nature? Do Now: List three things you compete for in your life.
A relationship in which two different species live together and interact closely over a long period of time.
Population Biology Chapter Population Dynamics.
Ecosystem Interactions Environmental Science. What Shapes Ecosystems AbioticBiotic Abiotic and Biotic Factors Habitat Habitat – physical location.
Interactions How organisms affect one another and their environment.
An inadvertent opening ramble about networks. Predation is a straight-forward interspecies population interaction. One species uses another as a food.
Population Growth Chapter What you need to know! The differences between exponential and logistic models of population growth How density-dependent.
Populations Objective Discuss what a limiting factor for population growth is. Limiting factor Density-dependent limiting factor Density-independent limiting.
Habitat and Lifestyle Unit A: Topic 2. Interdependence Each species relies on many other species in its environment No species can survive by itself Example:
INTERACTIONS IN ECOSYSTEMS. LEARNING GOALS Understand how biotic interactions in a community work, include predation, competition, and symbiosis. Explain.
Coniferous Forest Mrs. McGilvery class Braulio Garcia Gomez
INTERACTIONS IN THE ECOSYSTEM CHAPTER 5. Habitats and Niches Every organism is adapted to life in the habitat or ecosystem in which it lives The role.
STAGES OF POPULATION GROWTH. Population Growth can be… Exponential ORLimited (J curve)(S curve)
PREDATION One of the least well developed areas of ecological theory Management problems occur with a lack of information –Biological data on predators.
Unit B: Chapter 2 Vocabulary Living Things Depend on One Another.
Ch 4: Population Biology 4.1 Population Dynamics.
Adaptation Any characteristic (structure or behavior) that helps a plant or animal survive.
Lynx & Hare Learning Objectives 1.Students will be able to calculate population density. 2.Students will be able to graph the size of a population over.
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