Do now: Write in your notebook the answer to the 2 following ...

Do now: Write in your notebook the answer to the 2 following ...

Do now: Write in your notebook the answer to the 2 following questions. 1. Distinguish (similarities and differences) between scavengers and decomposers. 2. Distinguish between predation (what predators do) and

scavenging (what scavengers do). Scavengers and decomposers Scavengers (water snails, hyenas and vultures) consume dead animals. Decomposers (fungi, some bacteria) are

organisms of decay and break down the remains of both dead plants and animals. Their waste products release substances that can be reused by other members of the ecosystem.

Predation and scavenging

Both are done by carnivores Obtain prey in different ways Predators (lion) hunt and kill prey Scavengers (hyena) feed off dead carcasses that they find

Lichen How would you describe this organism? Lichen Lichen grows on the bark of trees, on rocks and on soil. They are usually the first

organisms to grow on bare rock. They are also abundant in the Arctic where they are eaten by reindeer and other animals. Lichen Lichens are made of green algae (or blue-green

bacteria) and a fungus that live together. Neither one could survive on their own. What problem or question does this bring to mind? Aim

Why do the algae and the fungus in the lichen need each other to survive? Describe green algae and its role in food chain? Green algae are autotrophs Like other autotrophs they convert sunlight

energy into nutrients via photosynthesis (Cyanobacteria, or blue-green bacteria can also carry out photosynthesis. They are simpler than algae and have 2 photosynthetic pigments, chlorophyll and phycocyanin)

Describe fungus and the role it plays in food chain Fungi are decomposers Describe the structure of lichen under a microscope

White filamentsfungi Green cells algae Why do they live together?

Based on your observations of the structure of a lichen, what can you hypothesize about the function of the algae and the fungus in the lichen? Algae provides nutrients to the fungus. Fungus provides protection, moisture

and needed elements to the algae Why is the close association in the lichen beneficial to both the algae and fungus? Each get something from the other that they

need. This relationship is a type of symbiosis, where both organisms benefit from the relationship, called mutualism Symbiosis

Symbiosis is where organisms live in close association Mutualism-type of symbiosis that benefits both organisms (example lichenalgae and fungus) What is THIS?

Parasitism Parasitism is a symbiotic relationship where the parasite benefits, but the host is harmed Example: Tapeworm lives inside hosts (human) intestine to absorb nutrients directly without their own digestive system

Another type of symbiosis http://www.youtube.com/watch? v=Wj5iqTW8GnE Clownfish live among anemones

Commensalism Commensalism is when one organism benefits but the other is not affected Example Clownfish and anemone. Anemone provide shelter and protection to fish, but

anemone get no benefits and are not harmed Niche in an ecosystem Each organism in an ecosystem occupy a particular place, called its habitat Each organism also has a particular role or job

within the ecosystem, called a niche. In a balanced ecosystem, each species occupies its own niche Predict what would happen if 2 different organisms occupied the same niche in an ecosystem.

What would happen if 2 different organisms occupied the same niche? They would compete with each other The stronger or better one at competing or doing its job would survive and the other one

would be eliminated from its niche. It would either die out, move somewhere else or try to take on a new, closely related niche Competition Competition among living things

Habitat= place Niche = role or job Interspecific competition Between different species competing for a niche

Better adapted species survives Less successful species eliminated Intraspecies competition Competition within individual members of a population (same species) Darwins survival of the fittest

Only the strongest and fittest individuals survive Work with your partner to classify each of these relationships Heartworm in dogs

Orchids and trees Flowers and bees Homework Miller and Levine: read pages 90-93, answer page 97 questions # 2, 4, 5 and page 117,

questions #25-29 Materials and methods for Bottle ecosystem lab is now due Monday

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