How To Find Relative Abundance

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How to calculate species abundance and variety

• Thread starter blicker
• Showtime date November iii, 2011

Homework Statement

This is the sample population taken along a 5m transect:
ants:9
grasshoppers:one
pill bugs:four
spiders:i

Homework Equations

What formulas would i use to calculate the species abundance and diverseness?

The Try at a Solution

I only know this formula H'=-[itex]\Sigma[/itex] (n[itex]_{}i[/itex]/Northward)xIn(n[itex]_{}i[/itex]/N) and i dont know what to do with this formula.

Homework Statement

Homework Equations

The Attempt at a Solution

Answers and Replies

Hello blicker!

Can it be that your formula is really:

where "ln" is the natural logarithm (and also a button on your calculator), and where n_i is the number of individuals of species i?

Run across: http://en.wikipedia.org/wiki/Shannon_index

yep thats it! simply i dont know what numbers go where or how to calculate information technology. like would i include the sigma symbol and the messages above and below information technology?

The sigma symbol indicates that you lot have to sum.
So:
[tex]H'=-\sum_{i=1}^S {n_i \over North} \ln {n_i \over N} = -({n_1 \over North} \ln {n_1 \over N} + {n_2 \over N} \ln {n_2 \over North} + {n_3 \over North} \ln {n_3 \over Due north} + {n_4 \over Due north} \ln {n_4 \over N})[/tex]

From wiki:
* ni The number of individuals in species i; the abundance of species i.
* South The number of species. As well called species richness.
* Northward The total number of all individuals
* pi The relative abundance of each species, calculated equally the proportion of individuals of a given species to the full number of individuals in the community: [itex]n_i\over Due north[/itex]

then would the equation for ants look like this:
-(9/xv)In(9/15)

so would the equation for ants look similar this:
-(9/15)In(9/15)

Well, Shannon's index specifies to sum all the terms.
So what y'all mention is only part of H'.

Btw, it is [itex]ln[/itex] ("logarithmus naturalis").

Only I tin can't actually tell you what your problem asks.
I'chiliad non studying whatever science you're studying - I'm a mathematician.

I did find this article well-nigh diversity: http://en.wikipedia.org/wiki/Diversity_Index
And obviously [itex]n_i[/itex] is the "species affluence".
Furthermore [itex]p_i={n_i \over Northward}[/itex] is the "relative species abundance".

well thanks for your help anyway.

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How To Find Relative Abundance,

Source: https://www.physicsforums.com/threads/how-to-calculate-species-abundance-and-diversity.547084/

Posted by: sancheznernat.blogspot.com

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