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The influence of area on the number of species

Discussion of the distribution and abundance of living organisms and how these properties are affected by interactions between the organisms and their environment

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The influence of area on the number of species

Postby Chiabete » Thu Nov 22, 2012 3:38 pm

Yello everyone,

So my biology book states (free translation) : " The surface area of an area influences the biodiversity. The number of species doubles when the area grows ten times. Or the other way; when the area reduces to 10% the number of species drop to half."

That's cool and all..but I can't wrap my mind around it. If the area is only 10% of what is used to be, how can the amount of species be even half? I can't see the mathematical pattern here:0 I hope someone can explain this in a way that a noob like me can understand.
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Postby JackBean » Fri Nov 23, 2012 3:54 pm

Because it's the same like when you grow area 10-times (10% -> 100%) and get double number of species.
http://www.biolib.cz/en/main/

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Postby animartco » Sat Jun 08, 2013 1:06 pm

OK I'm no mathematican but if you say increasing an area ten times simply doubles the number of species then it seems to me that reducing an area to a tenth would reduce the number of species to a 20th of the species that were in the original area.
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Postby JackBean » Sat Jun 08, 2013 5:00 pm

really? So when going from x m2 with y species to 10x m2 with 2y, it's different than when going from 10x m2 to x m2?
http://www.biolib.cz/en/main/

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Re:

Postby animartco » Tue Nov 19, 2013 1:16 pm

JackBean wrote:really? So when going from x m2 with y species to 10x m2 with 2y, it's different than when going from 10x m2 to x m2?

I don't do maths, but using logic instead, it seems that if you only get double the number by muliplying by ten, when dividing by ten you would get a catastrophic drop.
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Re: Re:

Postby ughaibu » Wed Nov 20, 2013 5:56 am

animartco wrote:I don't do maths, but using logic instead, it seems that if you only get double the number by muliplying by ten, when dividing by ten you would get a catastrophic drop.
If you have an area of ten with two species, then an area of one hundred has four species. How many species if you divide one hundred by ten?
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Postby animartco » Tue May 27, 2014 1:19 pm

The point is that if you have two species and you multiply the area by ten you should using basic maths get 20 species. But you only get four. So the actual equation that applies is one that is far more complicated than simple mathematics.
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