Let’s Start …take handout, complete Do Now: pass up HW 1. Define predator, prey, parasite...
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Transcript of Let’s Start …take handout, complete Do Now: pass up HW 1. Define predator, prey, parasite...
Let’s Start…take handout, complete
Do Now: pass up HW 1. Define predator, prey, parasite
Essential Question: Explain how evolution shapes the interactions among species in an ecosystem
Goal: interdependence of organisms
Anticipatory Set: In most animal stories…..weasels are
notorious fiends that randomly kill all the gentle creatures of their community. People who are dishonest are often called weasels. The fact is that weasels are predators of rats and mice. Why are weasels so important?
Zebra Mussels on a Crayfish!Brainstorm:What type of relationship do you think these two organisms have? explain
Plant-Herbivore Interaction Secondary compounds – when
chemicals are synthesized from products of their metabolism that are poisonous, irritiating, or bad tasting.
Tobacco plants contain Nicotine which is Poisonous to insects! - Poison Ivy (ex)
Parasitism: One benefits & one is harmed!
6 day old Purple Martin covered in blowfly parasites
Host parasite
ParasitismOne benefits & one is harmed!
Elephantitis - caused by 3 specific kinds of parasitic round worms
2 Kinds of Parasites Ectoparasites – external parasites, they
live on their host but do not enter the hosts’s body ex: ticks, fleas, lice, leeches, mosiquitoes
Endoparasites – internal parasites, live inside the host’s body ex: malaria parasites, tapeworms
The objective of the study was to determine the utility of leech therapy in venous congested microvascular free flaps in which venous outflow could not be established or surgical revision was unsuccessful. LEECH THERAPY!
Competition 1. competitive exclusion: one
species is elliminatted from a community because of competition for the same limited resources
2. resource partintioning: competition is most intense between closely related species that require same resources, each species uses only part of available resources
Continue…… 3. Character
Displacement: competitors may also evolve niche differences or anatomical difference that lessen the intensity of competition ex: Darwin’s finches!
Niche Habitat It’s way of life, role
species plays in it’s envir. Includes range of conditions that species can tolerate, the methods by which it obtains food needed, resources the no. of offspring it has it’s time of reproduction and all of its other interactions with it’s envir.
The physical area which an organism lives.
Mutualism and Commensalism
Mutualism: both species derive some benefit
ex: pollinators!
Commensalism: one species benefits and the other is not affected.
ex: barnacles that attach themselves to whales!
Successionthe gradual sequential regrowth of species in an area Primary succession: development of a
community in an area that has not supported life previously such as bare rock, sand dunes or island formed by volcanic eruption.
Secondary succession: replacement of species that follows disruption of an existing community.