Lecture 5.3 Flashcards
What was the predator prey example discussed in lecture
Prickly pear cactus in Australia
Imported from South America by a guy. Exploded around the country covering millions of acres. After some decades they went back to S. America and found a moth that is a parasite to the cactus. Introduced the moth in Australia
Predator prey relationships are relatively stable due to
Adaptations by both
There is always a ___ for prey and there is always ___ for predators
refuge
an alternative food species
a progression of changes through time in a community from pioneer species to climax species
Succession
No soil at the beginning, it has to be made
After a landslide
When a glacier retreats it leaves scowered rock
Takes longer, potentially centuries
Primary succession
when there is soil present at the beginning
Secondary succession
At the beginning of a sequence are ____species at the end are ___ species
pioneer
climax
More kinds of species emerge at the ___ of a sequence
End
As the community becomes more complex amount of ___ goes up
interactions
community + its physical environment
ecosystem
A type of community on the world level, communities of a same type the world over
Biome
Much of what is done with populations is
numeric
number of organisms born per female per unit time
Birth rate
Name the 5 things that can affect population size
Immigration Emmigration Birth rate Death rate Extinction
the number of organisms to die per unit time
Death rate
