Deutsch Intern
    Collaborative Research Centre 1047

    Project C3 Krauss

    Timing and phenology shifts in interacting plant – herbivore – predator systems


    Biotic interactions between species are central drivers for the coexistence of species and species diversity. Thereby timing and phenology of species must be harmonized to allow such interactions. If one species changes its timing, while an interacting species does not, it will lead to temporal mismatches with a disruption of the interaction and with possible fitness consequences. Temperature changes, e.g. due to anthropogenic climate change, can affect species in different ways and not all species will shift their timing in parallel. The central questions of this project are:

    1. How is wing production and fitness in different aphid morphs affected by changes in temperature, day length and environmental stressors ?
    2. How is the timing and fitness of interacting species in a multi-trophic system – a grass species with and without endophyte infection, a grass aphid and its specialized predator – affected by global change (e.g. enhanced temperature and nutrient supply)?

    Fig.1: Acyrthosiphon pisum (pea aphid) with unborn embryos on Pisum sativum (pea) (courtesy by Jens Joschinski)

    Fig. 2: Exclosure experiment, a) with exclusion of aphid predators and b) free access of aphid predators (courtesy by Carmen Börschig)


    • Schenk, M., Krauss, J., and Holzschuh, A. (2018) Desynchronizations in bee-plant interactions cause severe fitness losses in solitary bees, Journal of Animal Ecology 87, 139-149.
    • Joschinski, J. (2017) Is the phenology of pea aphids (Acyrthosiphon pisum) constrained by diurnal rhythms?, PhD Thesis, University of Wuerzburg.
    • Joschinski, J., and Krauss, J. (2017) Food colouring as a new possibility to study diet ingestion and honeydew excretion by aphids, Entomologia Experimentalis et Applicata 164, 141--149.
    • Fuchs, B., Krischke, M., Mueller, M. J., and Krauss, J. (2017) Plant age and seasonal timing determine endophyte growth and alkaloid biosynthesis, Fungal Ecology 29, 52--58.
    • Fuchs, B., Breuer, T., Findling, S., Krischke, M., Mueller, M. J., Holzschuh, A., and Krauss, J. (2017) Enhanced aphid abundance in spring desynchronizes predator--prey and plant--microorganism interactions, Oecologia 183, 469--478.
    • Joschinski, J., Kiess, T., and Krauss, J. (2017) Day length constrains the time budget of aphid predators, Insect science.
    • Beer, K., Joschinski, J., Arrazola Sastre, A., Krauss, J., and Helfrich-F"orster, C. (2017) A damping circadian clock drives weak oscillations in metabolism and locomotor activity of aphids (Acyrthosiphon pisum), Sci Rep 7, 14906-14906.
    • Fuchs, B. (2016) Effects of timing and herbivory on a grass-endophyte association and ist trophic interactions, PhD Thesis, University of Wuerzburg.
    • Joschinski, J., Beer, K., Helfrich-Förster, C., and Krauss, J. (2016) Pea aphids (Hemiptera: Aphididae) have diurnal rhythms when raised independently of a host plant, J Insect Sci 16, 31.
    • Schneider, G., Krauss, J., Riedinger, V., Holzschuh, A., and Steffan-Dewenter, I. (2015) Data from: Biological pest control and yields depend on spatial and temporal crop cover dynamics, Journal of Applied Ecology 52, 1283--1292.
    • Joschinski, J., Hovestadt, T., and Krauss, J. (2015) Coping with shorter days: do phenology shifts constrain aphid fitness?, PeerJ, PeerJ Inc. 3, e1103.
    • Börschig, C., Klein, A. -M., and Krauss, J. (2014) Effects of grassland management, endophytic fungi and predators on aphid abundance in two distinct regions, Journal of Plant Ecology 7, 490-498.
    • Fuchs, B., Krischke, M., Mueller, M. J., and Krauss, J. (2013) Peramine and Lolitrem B from Endophyte-Grass Associations Cascade Up the Food Chain, Journal of Chemical Ecology, Springer US 39, 1385-1389.

    Other publications (not peer reviewed)

    Joschinski J (2016) Benefits and costs of aphid phenological bet-hedging strategies. Research Ideas and Outcomes 2: e9580. doi: 10.3897/rio.2.e9580


    PD Dr. Jochen Krauss
    Lehrstuhl für Tierökologie und Tropenbiologie
    Theodor-Boveri-Institute Biozentrum, Universität Würzburg
    Am Hubland
    D-97074 Würzburg, Deutschland

    Phone: +49-931-31-82382
    Fax:   +49-931-31-84352
    Mail:  j.krauss@uni-wuerzburg.de
    Web: PD Dr. Jochen Krauss