1. Relationships in Ecosystems

2. Populations
• All of the same species in an ecosystem
www.nkf-mt.org.uk
www.intrasystems.gr

3. Competition
• All living things compete for
– Food
– Space
• Competition limits population growth
www.opim.wharton.upenn.edu

4. Limiting Factors
• Anything that restricts or controls the
number of individuals in a population
www.bahamascommerce.com

5. Carrying Capacity
• The largest number of individuals of one
species an ecosystem can support
www.wwt.org.uk

6. Symbiosis
• Any close relationship between species
en.wikipedia.org

7. Mutualism
• A relationship in which both species benefit
Cleaner fish
Pollination
Lichens: algae + fungus
www.biology.clc.uc
.edu
www.orn.mpg.de
www4.tpgi.com.au

8. Commensalism
• A relationship in which one species
benefits and the other is neither helped
nor harmed
Barnacles on whale
Shark & remora
www.community.webshots.com
www.cbu.edu

9. Parasitism
• A relationship in which one organisms
benefits and the other is harmed
Tick
Mistletoe
www.oznet.ksu.edu www.wcosf.org

10. Predator - Prey
• Predators are consumers that capture and
eat other consumers, called prey
http://www.uga.edu

11. Cooperation
• Organisms working together toward a
common end or purpose
http://forger.ca/
http://special.newsro
om.msu.edu