New information about the role of migratory birds influencing plant distribution comes from evidence of them carrying microscopic bits of plants (bryophyte diaspores). Read on Tiny plants ride on the coattails of migratory birds: Migrant birds may be virtual dispersal highways for plants:

Full paper can be downloaded here: Lily R. Lewis, Emily Behling, Hannah Gousse, Emily Qian, Chris S. Elphick, Jean-François Lamarre, Joël Bêty, Joe Liebezeit, Ricardo Rozzi, Bernard Goffinet. First evidence of bryophyte diaspores in the plumage of transequatorial migrant birds. PeerJ, 2014; 2: e424 DOI: 10.7717/peerj.424<> (12 MB!)

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