Isn't abundance usually considered to be close to a lognormal distribution? 

Scott
On Friday, March 18, 2011 at 8:14 AM, Sacha Viquerat wrote: 
> hello! I did a count survey on a tropical fish species! Well, I didnt do 
> it, Im just helping at the statistics-stage. We recorded some water 
> parameters alogside each catch, such as no3, no2, po4 etc. as the data 
> are count data (and require error terms due to spatial 
> pseudoreplication), the glm with poisson error structure should be the 
> method of choice. however, I do fear that in doing so, I will not be 
> able to model fish abundance correctly. In my opinion (and, as far as I 
> remember, in the opinion of those who gave ecology classes), the 
> abundance of species should be sort of bell shaped, since there will 
> always be, for example, an optimal temperature, pH-level and so forth. 
> However, I have not yet seen such a discussion arise on one of the many 
> forums. Am I missing the obvious??
> 
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