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Lecture 34

BIOL 104 Lecture 34: Lecture 4:20

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BIOL 104

Metamorphasis was really good idea—arose 80 mya. - allows them to have the most successful morphology for their purpose - some structures are retained and others are not: breathing tubes stay intact, gut shrinks and is remodeled but doesn’t start from scratch - “imaginal disks” start dividing close to pupation to form the new organs - hormonal cue makes it reveal the chrysalis - memory also persists across metamorphosis Superbloom—tons of seeds in the desert, and they all bloom in the right environmental conditions - we’re having one now because of the ending to the drought in California We’re going to talk about communities and ecosystems and how they’re linked to each other. Trophic cascade—ecological process from the top of the food chain down to the bottom - ex. when wolves were reintroduced into Yellowstone, they ate the deer/changed their vegetation and that saved the vegetation, which increased birds/beavers, etc. – the ecosystem transformed - even the river behavior changed! because the regenerating forests stabilized the banks Ecosystem—all organisms living in an area and the abiotic factors with which they interact - community and its physical environment Materials cycle around the ecosystems.  Nitrogen, phosphorous, etc.  All involve plants, herbivores, predators, bacteria, etc. We’re going to focus on the communities (interacting comumunities) that cycle this material, and it’s often represented as a chain, Primary produces eaten by herbivores eaten by carnivores eaten by other carnivores, etc. - Primary producer, primary consumer, secondary consumer, tertiary consumers, quaternary cstsumers nd - 1 trophic = producer, 2 trophic, etc The energy and the materials move up through these chains. It’s important to remember that they move back down between the levels—decomposers feed the primary producers. There are a lot of “ripple effects” of organismal interactions. Direct—bird eats the caterpillar, caterpillar eats the plant (direc
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