Author(s)

F. Jordán

Abstract

Ecosystem flow networks and community control F.Jordan Collegium Budapest, Institute for Advanced Study, Hungary Abstract It is not easy to construct the food web graph of a community: both points and links are strongly questionable. Although recently described modern food webs have high resolution (have many points), two serious problems still remain. First, these are generally binary webs: links give no information on the importance of interactions (the number of large weighted webs is small). Second, their properties are very sensitive to methodology (i.e. data collection and aggregation procedure). Thus, high resolution in itself cannot guarantee reality. It is suggested that the mostly valuable conclusions on community organisation can be drawn by comparing weighted webs depicting the same community under different conditions. In this case, the comparison of similarly described webs may partly diminish methodical problems. Seasonal trophic flow networks of

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