Are landscape structures insurmountable barriers for foraging bees? A mark-recapture study with two solitary pollen specialist speciesAntonia Zurbuchen, Christoph Bachofen, Andreas Müller, Silke Hein and Silvia DornApidologie, 41 4 (2010) 497-508DOI: https://doi.org/10.1051/apido/2009084