Figure 4

Species numbers and abundance of potential hybridisation partners of oilseed rape [OSR]. The location of the 100 BINATS test areas is indicated with symbols. Different sizes and colours refer to the listed species numbers ( a ) or abundance of species ( b ) sexually compatible to oilseed rape in Austria [55, 56, 63]. The following related species were considered for the calculation: Brassica elongata, B. juncea, feral B. napus, B. nigra, feral B. oleracea, wild and feral B. rapa, Conringia austriaca, C. orientalis, Crambe tatarica, Diplotaxis muralis, D. tenuifolia, Eruca sativa, Erucastrum gallicum, E. nasturtiifolium, Hirschfeldia incana, Raphanus raphanistrum, wild and feral R. sativus, Rapistrum perenne, R. rugosum, Sinapis alba, S. arvensis, Sisymbrium altissimum, S. austriacum, S. irio, S. loeselii, S. officinale, S. orientale, and S. strictissimum. ( a) Number of recorded species (see list above) in each BINATS test area closely related to OSR and occurrence of weed beets. The four registered locations of weed beets (black arrows) sexually compatible with the crops fodder and sugar beet are also indicated in this map. ( b) Abundance of species closely related to OSR observed in each BINATS test area using a logarithmic estimation scale during field work. Colours and sizes of symbols refer to the listed individual numbers on this map.