R help - Jan 2010 - time series analys by resting the effect of a covariate

Hi,

Does anyone know a way to estimate the existence of a temporal trend (each unit
of the sample is a count) by resting the possible effect of a covariate (i.e.
climatic factor)?
I have periodical counts of several species of waterbirds during the last 13
years and I want to know if, resting the effect of the flooded area available,
there would be a temporal trend.
I know the flooded area is correlated with the time series data of most of
species I'm taking in account.

I had a look to time series section of the http://cran.r-project.org
but I didn't find nothing on this issue.

Thanks for any response
 		 	   		  
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