2.3 Life History and Survivorship Flashcards
Populations are on a
spectrum
True/False: R-selected species produce more offspring
True
True/False: K-selected species produce less offspring
True
R-selected species have
less chance of survival
k-selected species have
larger chance of survival
k-selected examples of animals
elephants, owls, dolphins
k-selected example plant
coconuts
humans are
k-selected
Survivorship curves can be
influenced by environment
r-selected examples animals
spiders, insects, ants, fish
R-selected example plant
dandelion
R-selected curve
Type 3
k-selected curve
Type 1
different life histories tend to fit
different survivorship curves
Do r-selected species have more or less parental care?
less
Do k-selected species have more or less parental care?
more
A straight diagonal line
Type 2
Many organisms die at a young age
r-selected, Type 3
More organisms survive to adulthood
k-selected, Type 1
k-selected have
longer life spans
a log graph
has a scale based on powers of 10
How might an environment abundant with resources affect the curve of a r-selected species
The curve will likely look more like a Type 2 curve because more organisms survive longer
An organism cares for 1 offspring at a time. R or K?
K-selected
