Juliane Horn


Helmholtz Centre for Environmental Research - UFZ
Department of Ecological Modelling

Permoserstr. 15                                                    P1000095
04318 Leipzig

Building 1.0, Room 203

Tel.: +49 341 235-1064
Fax: +49 341 235-451064

Research Interests

As one of the major drivers contributing to the ongoing decline in honeybee health and hive numbers, insufficient nutrition due to changed land use systems has been suggested. So far the link between forage availability in agricultural landscapes and honeybee performance has not been specified. This limits the ability to develop reliable policy instruments. Thus, my research focuses on an improved understanding how the spatiotemporal forage availability in different agricultural systems affects the resilience of a honeybee colony. Furthermore, this research aims to predict the resilience and persistence of honeybee colonies in response to current and future land use changes.

  • Simulation of honeybee colony resilience in response to spatial and temporal forage stress under highly stylized landscape settings by using the honeybee simulation model BEEHAVE
  • Development of an agricultural landscape generator NePoFarm
  • Simulation of the relation between colony resilience and spatiotemporal continuity in forage availability in low vs. high-diversity cropping systems
  • Evaluation of the effectiveness of Ecological Focus Areas (EFA), which is part of the current Common Agricultural Policy (CAP) reform of the European Commission, for ensuring spatiotemporal continuity in forage availability for honeybees


  • Becher, M.A., Grimm, V., Knapp, J., Horn, J., Twiston-Davies, G., Osborne, J.L., (2016):
    BEESCOUT: A model of bee scouting behaviour and a software tool for characterizing nectar/pollen landscapes for BEEHAVE
    Ecol. Model. 340 , 126 - 133
    full text (url)
  • Becher, M.A., Grimm, V., Thorbek, P., Horn, J., Kennedy, P.J., Osborne, J.L., (2014):
    BEEHAVE: a systems model of honeybee colony dynamics and foraging to explore multifactorial causes of colony failure
    J. Appl. Ecol. 51 (2), 470 - 482
    full text (url)
  • Henry, M., Becher, M.A., Osborne, J.L., Kennedy, P.J., Aupinel, P., Bretagnolle, V., Brun, F., Grimm, V., Horn, J., Requier, F., (2017):
    Predictive systems models can help elucidate bee declines driven by multiple combined stressors
    Apidologie 48 (3), 328 - 339
    full text (url)
  • Horn, J., (2017):
    A modelling framework for exploration of a multi-dimensional factor causing decline in honeybee health - towards a better understanding how forage availability in agricultural landscapes affects honeybee colony persistence
    Dissertation, Universität Potsdam
    221 pp.
  • Horn, J., Becher, M.A., Kennedy, P.J., Osborne, J.L., Grimm, V., (2016):
    Multiple stressors: using the honeybee model BEEHAVE to explore how spatial and temporal forage stress affects colony resilience
    Oikos 125 (7), 1001 - 1016
    full text (url)
  • Lachmuth, S., Henrichmann, C., Horn, J., Pagel, J., Schurr, F.M., (2018):
    Neighbourhood effects on plant reproduction: An experimental–analytical framework and its application to the invasive Senecio inaequidens
    J. Ecol. 106 (2), 761 - 773
    final draft (pdf)