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Using data taken as part of the Bluedisk project we study the connectionbetween neutral hydrogen (HI) in the environment of spiral galaxies and that inthe galaxies themselves. We measure the total HI mass present in theenvironment in a statistical way by studying the distribution of noise peaks inthe HI data cubes obtained for 40 galaxies observed with WSRT. We find thatgalaxies whose HI mass fraction is high relative to standard scaling relationshave an excess HI mass in the surrounding environment as well. Gas in theenvironment consists of gas clumps which are individually below the detectionlimit of our HI data. These clumps may be hosted by small satellite galaxiesand\or be the high-density peaks of a more diffuse gas distribution in theinter-galactic medium. We interpret this result as an indication for a picturein which the HI-rich central galaxies accrete gas from an extended gasreservoir present in their environment.

An HI View of Galaxy Conformity: HI-rich Environment around HI-excess Galaxies