Organisms and Their Environment: What is ecology?
Stellar's Sea Lions
found all across north pacific
eat Polluck, and Herring
smell really bad
aggressive when approached (especially males during mating season)
can grow to be very large in size (upto 3 metres in length and 1 ton in weight)
Herring population decreased, polluck pop. increased
western pop of sea lions decreased b/c polluck not as full of energy (fat) and
not enuf herring to get energy
o called "junk food" hypothesis
Lecture 2: What is Ecology?
What is Ecology?
ecology study of relationships b/w organisms and their environments (both
living and non-living)
study the relationships at different levels
o biomes = larger landscapes
scale increases as you go up the hierarchy
o scales vary even w/ individuals/populations
o ex. bird migration
complexity also increases
best way to start investigation is at individual level b/c complexity is limited
ecologists can't control what happens in their experiments the way physicists
o have to