RELATIONSHIPS AMONG LIVING THINGS Day 3. Interactions Among Living Things Living things depend on one another for survival An organism may have multiple.

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Presentation transcript:

RELATIONSHIPS AMONG LIVING THINGS Day 3

Interactions Among Living Things Living things depend on one another for survival An organism may have multiple relationships, depending on the organism it interacts with

Competition Can be between same species or different species Occurs when resources are limited: –Food –Water –Space –Mate Fight occurs in order to gain resources needed

Predation An animal catches and feeds on the captured organism Predator-hunter Prey-hunted

Symbiotic Relationships: MUTUALISM Symbiosis-a close relationship between organisms that last over a period of time Mutualism –Both organisms benefit from the relationship –Benefit include food, shelter, protection Plover and Crocodile

Symbiotic Relationship: PARASITISM One species benefits but the other specie gets harmed from the relationship Benefit can be food, shelter or protection Parasite-benefits –May reside inside (endoparasite) or outside (ectoparasite) Host-gets harmed The parasite has to ensure that the host does not die. –What happens if the host dies? Mosquito and Human Tapeworm and Human

Symbiotic Relationship: COMMENSALISM A relationship wherein one benefits while the other one neither benefits, nor gets harmed or dies. Commensal- the organism that benefits Host- the organism that neither benefits nor gets harmed

Video Segments: The Secret World of Sharks and Rays | Nature | PBS Ecological Relationships: EXAMPLES Video Segments: The Secret World of Sharks and Rays | Nature | PBS

Symbiotic Relationships: 1. Yellow- billed Oxpecker eating ticks off the back of a Hippo. Mutualism 2. Elf Owl and Roadrunner both trying to eat an insect. Competition 3. Coral provides home for algae. Algae produces food for coral. Mutualism 4. Tiger hunting a rabbit. Predation 5. Wasp lays eggs on Tomato Hornworn caterpillar. Eggs hatch, burrow into caterpillar and eat it for food. Parasitism 6. Red-tailed Hawk builds nest in branches of Saguaro catcus. Cactus is not harmed. Commensalism

What does “Survival of the Fittest” mean? SURVIVAL OF THE FITTEST Nature’s way of determining traits needed by an organism to help it’s species survive- Natural Selection

 The traits that help an organism survive in a particular environment /habitat

About.com: discoveries-shorts-natural-selection.html

The Mono Lake Story The Mono Lake Story - YouTube

Is there a relationship which you think is the best? Why do you say so?

Picture sources susty.com thefeltsource.com myfourthirds.com catalog.beacon-ridge.com static.seekingalpha.com classes.dma.ucla.edu Bcscience.com bio.miami.edu physicalgeography.net webecoist.com themain-ingredient.info ncwildlife.org wikimedia.org