lab 1
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Fundamental niche
total range of physical conditions which organism could theoretically survive
realized niche
portion of fundamental niche actually occupied by species
Niche Breadth
range along a resource spectrum given organism can occupy –> the width of the curve
narrow niche breadth vs wide niche breadth
narrow niche breadth= specialist wide niche breadth = generalist
niche breadth (B) closer to 1
more generalist
niche breadth (B) closer to 0
more specialist
Niche overlap coefficient
alpha jk
niche overlap coefficient closer to 1 vs closer to 0
closer to 0=less overlap closer to 1= more overlap
competitive exclusion
the elimination of a species form a overlapping abitat
what are the results of competitive exclusion
• one species could replace inferior species entire geographic range, causing extinction -allopatric distribution: the elimination of a species from part of its range -both species remain in overlapping sympatric distribution, inferior species must abandon limited resource and replace it
what type of data is chi square goodness of fit test used for
count/ enumeration data
what are the different variables in the niche breadth and niche overlap calculations B n pi qi alpha jk j and k pij pik=
B=Niche breadth n=#food types pi= proportion of species diet consisting of food i qi=proportion of available resources made of type i alpha jk=coefficient of niche overlap species–> j and k pij pik=proportion of diets of species j and k consiting of food type i