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Broder Breckling University of Bremen Broder@uni-bremen.de

Contribution to the session on Outcrossing, contamination and co-existence - state of science and experience. Contribution to the session on Outcrossing, contamination and co-existence - state of science and experience. Broder Breckling University of Bremen Broder@uni-bremen.de.

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Broder Breckling University of Bremen Broder@uni-bremen.de

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  1. Contribution to the session on Outcrossing, contamination and co-existence - state of science and experience Contribution to the session on Outcrossing, contamination and co-existence - state of science and experience Broder Breckling University of Bremen Broder@uni-bremen.de Broder Breckling University of Bremen Broder@uni-bremen.de

  2. Study of oilseed rape and hybridisation partner frequency in and around Bremen (Dissertation of Gertrud Menzel)

  3. Cultivated Oilseed Rape Volunteer Oilseed RApe Feral oilseed rape NN Brassica napus

  4. Diplotaxis tenuifolia Brassica oleracea Brassica rapa Raphanus raphanistrum Sinapis arvensis Potential Hybridisation partners of oilseed rape

  5. Investigation area Bremen and representative landscape types in Lower Saxonyy in a 50 km surrounding

  6. Outcrossing Potential

  7. Cultivation (1 km grid) Volunteers (1 km grid) • Oilseed rape cultivation on about 13 % of the fields • Volunteer growth on about ca. 7 % of the fields

  8. Potential hybridisation partners of OSR (# of locations) Ø 1,4 Locations per km²

  9. Diversity centre Different species per grid element (1 km²)

  10. Flowering phase • Oilseed rape has deviating flowering phase when growing outside cultivation • Flowering OSR plants were found during the entire vegetation phase from March to November • Flowering phase of OSR and potential hybridisation partners are largely overlapping

  11. Preliminary Conclusions • There is a previously unrecognised biotic diversity centre of OSR and hybridisation partners in urban areas. • OSR and hybridisation partner flowering phase largely overlap • Frequent occurrences along transport axes (road, railways) may facilitate rapid displacements of new genotype combinations.

  12. Bundesamt für Naturschutz, Bonn, 2004 Further Reading(in German) Gentechnisch veränderte Pflanzenund Schutzgebiete - Wirksamkeitvon Abstandsregelungen Gertrud Menzel, Ingo Lünsmann, Ulrike Middelhoff,Broder Breckling, Gunther Schmidt, Jörg Tillmann,Wilhelm Windhorst, Winfried Schröder,Juliane Filser und Hauke Reuter

  13. Thank you for your attention

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