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ch12 pop distrabution - Coggle Diagram
ch12 pop distrabution
distrabution poroperties can be estamated
direct counts or census
area and vulume surveys=count all within a specific space
line-transect surveys=count an amount that move along a line running a string in a prarie and counting the number of plants that transect
mark recapture=collect and mark and done again recatured can estamate a pop
first: M(marked indaviduals)/N(population size)
second: R(recaptured)/C(unmarkded in second capture)
N=MxC/R
indirect counts=general count of numbers such as tracks or number of dams by bevers
quantafying dispersal=tags with radio transmitors
liftime dispersal distance=how far an indavidual moces from birthplace in its lifetime
geo range is affected by ecologicly sutable habatat
fundamentle niche=range of abiotic condition where species can persist(temp,ph ect)
realized niche= range of biotic and abiotic conditions a species can persilt (do)
geographic range=total area covered by a population
endemic specias=species that linve in single oftin isolated location
cosmopolitan species=species with large geographic range over several contanents
ecological niece modeling=process of dermineing a sutable habatat conditions for species
ecological envelope=range of ecoconditions that are predicted to be sutable (could be)
use in
invasive species distabutions
shifts from climate change
chalanges
hystorical data not alwayse the same as future data
pop dist have 4 cartisti
abundince=tot # indavids that exist in an area
density=# indavid in a unit of area/volume(=abumdince/area)
dispersion=spacing of indavids within geopop
clustered=indavid agergate in discrete groups(mushrooms schools or flocks)
can be different based on scale
evenly spaced=each indavid is uniform distance from its neibor (wolves)
random=each indavid is indapendent of position of other indavids(dandalions)
dispersal=movement of indavids from one area to another
and not returning
dispersal is essental to colonization
limitaations=a substantial barrier that prevernts dispersl betn habatats sutable(ocean for a seed)
habatat corridors
strip of favorable habatat between two large patches of inhospitable habatat to facill dpspercal
ideal free distra amoung habatat
pop abundince and density are related to geo range and adult body size
pop abundince and geo range
pop w/ high abundince have large geo range
resource avalability plays inportant role
pop desity and body size
density is negatively related to size(high mice low elephants)