Changes in the trophic structure of communities are good indicators of ecosystem stress or environmental change. Here, we compare the sink webs of two bird species (great tit, Parus major, and European blackbird, Turdus merula) in two habitats (a forest and an orchard), in order to detect the differences in their trophic status. The webs are functionally aggregated in three steps, based on energetics. Our main conclusion is that tits are less sensitive to habitat change from the natural to the agricultural.
., Harrach , B. and Benko , M. ( 2010 ): Recognition and partial genome characterization by non-specific DNA amplification and PCR of a new siadenovirus species in a sample originating from Parus major, a greattit . J. Virol. Methods 163 , 262 – 268