When designing an experiment how large should i make theplot

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

Moderators: honeev, Leonid, amiradm, BioTeam

Post Reply
Posts: 12
Joined: Wed Oct 08, 2008 4:46 am

When designing an experiment how large should i make theplot

Post by mmmmmm » Thu Oct 09, 2008 12:59 am

in general what factor would determine the appropritate scale?

I dont understand..what are plots and what determines how large or small they are?

User avatar
King Cobra
King Cobra
Posts: 1039
Joined: Tue Jan 24, 2006 8:51 pm
Location: Oregon, USA

Post by AstusAleator » Thu Oct 09, 2008 1:50 am

A plot is a cordoned-off section of the test-area that you will be getting your data from. Using a plot gives you the advantage of assigning relevant reference data to your collected data. For example, if you are trying to determine the total vegetative production in an area, you can make a plot of a known size, find the production in that plot, and then expand your results to extrapolate the total production of the area.
If the area in question is 300 square meters, I can put down a 1 square meter plot, determine production in that plot, and then multiply by 300.

As for the size of a plot, that depends on the variables being measured, and the amount of area being assessed. If you are counting bacterial colonies on a petri dish (there are better ways to do this than with plots, but this is just a micro-example) you might use a 1 square centimeter plot or smaller! If you are counting blades of grass on a lawn, and the density of the blades seems pretty uniform throughout, you could use a 1 square foot plot (though I would take data from more than one plot, average them, then extrapolate). If your project scale is over an entire landscape, then you might want to use 600 square meter plots or even larger, and lots of them.
What did the parasitic Candiru fish say when it finally found a host? - - "Urethra!!"

Post Reply

Who is online

Users browsing this forum: No registered users and 3 guests