2.1 Species Growth Flashcards
introduced species aka
exotic species
introduced species
species transferred by humans from native to new habitat
introduced species is opposite of what
native species
native species
species that occurs naturely in an area without human intervention
why do humans bring species into diff places usually
for agricultural purposes
bringing an introduced species into an environment ____ (increases/decreases) its species diversity
increases
cryptogenic species
species which humans do not know where they originally lived bc of they lost track of how many times and where they were moved
crypto means
hidden
genic means
origin
are all introduced species bad
no both
example of why an introduced species could be good
helps with agricultre; helps give more food for other organisms or people
example of why an introduced species could be bad
destroy other life already in the particular environment
decrease species richness
competitive advantages
the lack of natural controls such as predators and diseases that keep organisms in check –> so like if u move a rat to a new place it will have a higher chance of living bc not a lot of things will eat it anymore
invasive species
an introduced species that causes significant harm to the ecosystem by rapidly spreading and outcompeting native species, essentially disrupting the natural balance –> they decrease ecosystem function
invasive species vs introduced species
all invasive species are bad; there’s a mix of bad and good introduced
invasive species disrupt what
food webs and balance –> make unhealthy environment
k selected species
organisms that have few children at a time and care for them and tend to be larger
r selected species
organisms that have a lot of children at a time and don’t care for them and tend to be smaller
what type of growth do r selected species have
exponential
what type of growth do k selected species have
exponential until reach carrying capacity and then kinda js stop
biotic potential
how quickly an organism can reproduce and their kids can also do that
carrying capacity
the max amount of organisms an environment can support
invasive species are usually what type
r selected
survivorship curves
graphs that show the proportion of the population that survives for all of the ages
cohort
group of individuals from the same population who are born at the same time
different types of survivorship curves
type I, II, and III
type I survivorship curves
organisms tend to survive beyond their young and middle-ages and die when they become elderly. These organisms usually have small numbers of offspring and provide lots of parental care to make sure those offspring survive
type II survivorship curves
constant proportion of individuals dying at each age interval. and have relatively few offspring and provide them with lots of parental care
Type III survivorship curve
populations that have a high death rate among the young, but a relatively low death rate for those who survive into middle and old age. These organisms usually have lots of offspring at once, but don’t provide them with much parental care.
types of growth curves
r and k curves
which survivorship curves show k-selected species
types I and II
which survivorship curves show r-selected species
type III
K-selected species have traits that are advantageous at ____ (high/low) population densities
high
K-selected species tend to have ____ (short/long) lives, thrive under _____( stable/unstable) conditions, be ____ (small/large) in size
long; stable;large
K-selected species produce ___ (few/alot) offspring, reproduce ____ (once/more than once) in a lifetime, and provide ____ (no/lots) of prenatal care
few;more than once; lots
r-selected species have traits that are advantageous at ____ (high/low) population densities
low
r-selected species tend to have ____ (short/long) lives, thrive under _____( stable/unstable) conditions, be ____ (small/large) in size
short; unstable; small
r-selected species produce ___ (few/alot) offspring, reproduce ____ (once/more than once) in a lifetime, and provide ____ (no/lots) of prenatal care
alot; once; no
strategy for identifying what survivorship curve a species exhibits
see if at the end of a long time there is a big amount or a small amount of surviving organisms
