K-selected and r-selected species Flashcards
(39 cards)
quantity > quality:
ex:
quality > quantity:
ex:
- r-selected species
- spiders
- k-selected species
- elephants
what is the competition for resources like in k-selected species’ habitats?
usually relatively high
what is the competition for resources like in r-selected species’ habitats?
usually relatively low
k-selected species tend to be what?
(size, number, environment, parenting approach, maturing, life span, reproduction)
k-selected species tend to be:
- large
- have a few offspring per reproduction event
- live in stable environments
- expend significant energy for each offspring
- mature after many years of extended youth and parental care
- have long life spans/life expectancy
- reproduce more than once in their lifetime
r-selected species tend to be what?
(size, number, environment, parenting approach, maturing, life span, reproduction)
r-selected species tend to be:
- small
- have many offspring
- expend or invest minimal energy for each offspring
- mature early
- have short life spans
- may reproduce only once in their lifetime
r-selected vs k-selected species: size
k-selected species tend to be large
r-selected species tend to be small
r-selected vs k-selected species: energy for offspring
k-selected species tend to expend significant energy for each offspring
r-selected species tend to expend or invest minimal energy for each offspring
r-selected vs k-selected species: number of offspring
k-selected species tend to have few offspring per reproduction event
r-selected species tend to have many offspring
r-selected vs k-selected species: environments
k-selected species tend to live in stable environments
r-selected species vary in their environments
r-selected vs k-selected species: maturing
k-selected species tend to mature after many years of extended youth and parental care
r-selected species tend to mature early
r-selected vs k-selected species: life spans and reproduction
k-selected species tend to have long life spans/life expectancy and reproduce more than once in their lifetime
r-selected species tend to have short life spans and may reproduce only once in their lifetime
what is biotic potential?
refers to the maximum reproductive rate of a population in ideal conditions
are reproductive strategies always r-selected or k-selected?
no, many species have reproductive strategies that are not uniquely r-selected or k-selected, or they change in different conditions at different times
how are k-selected species affected by invasive species? what about r-selected species?
k-selected species are typically more adversely affected by invasive species than r-selected species, which are minimally affected by invasive species
most invasive species are:
r-selected species
k-selected and r-selected are:
reproductive strategies/approaches
k-selected species are more likely to be:
r-selected species are more likely to be:
- disrupted by environment change or invasive species
- invasive
do k-selected species have a high biotic potential?
k-selected species have a long lifespan and a long time to sexual maturity, so they have a low biotic potential, and thus a slow population growth rate
do r-selected species have a high biotic potential?
r-selected species have a short lifespan and are quick to sexual maturity, so they have a high biotic potential, and thus a high population growth rate
do r-selected species or k-selected species work better?
they both work because they are both just different approaches/strategies to accomplish the same goal: passing on their genes through reproduction
what is a low biotic potential?
there is a low maximum reproductive rate
why are k-selected species more likely to be affected by environmental disturbances?
in the case of disease or a natural disaster, it takes them longer to reach their original population size
k-selected species examples:
birds, most mammals
r-selected species examples:
insects, fish, plants
