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Flashcards in Ecology Deck (485)
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481

example of keystone species

sea otter- without them sea urchins take over-- eat kelp-- nursing grounds collapse-- entire sub tidal community shifts

482

keystone molecule

DMS- dimethyl sulphide- produced when plankton feed on algae-- attract bird/fish-- they poop--nutrients increase algae growth

483

the major advantage to breeding earlier in life rather than later is

is shortens generation time

484

experimental removal of fish eating birds from a salmon river in eastern Canada led to which important ecological observation?

number of adult salmon returning to the river did not change

485

today, there are about 7billion humans on the planet. the yearly mortality rate is ~1% and generation time is about 15years. If each female produced one daughter in her life, the earths total population would be closest to which one of the rolling in 50 years assuming these rates remain similar

4 billion