Dr. Gita Benadi

Department of Biometry and Environmental System Analysis

Tennenbacher Straße 4, 79106 Freiburg, Germany
Room 03.066

email: gita.benadi(at)biom.uni-freiburg.de
phone: +49 761 203-3745
fax: +49 761 203-3751

Research interests

Pollinators and seed dispersers provide important services to plants in exchange for food resources. Typically, multiple plant and animal species are connected in a network of such mutualistic interactions. In my research, I aim to understand which factors determine the structure of plant-animal mutualistic networks and how these interactions influence plant community dynamics. Answering these questions will enable us to better predict the consequences of loss of species and interactions through anthropogenic disturbances such as habitat destruction and climate change.

 

 Current project

DFG project: Frequency dependence of pollination - from individual behaviour to community dynamics

How species with similar resource requirements are able to coexist is one of the oldest and most central questions in ecology. Theoretical work has shown that a negative relationship between each species' relative abundance and its fitness (negative frequency dependence) is necessary for stable coexistence, while positive frequency dependence destabilizes coexistence and leads to a loss of diversity. In many plant species, fitness depends on pollination by animals, but how the pollination success of plant species varies with their frequency is not fully understood. Previous theoretical studies have suggested that pollination success should be positively frequency dependent under most conditions, but these predictions were based on simple models of pollinator foraging behaviour. Moreover, it is currently unclear how plant and pollinator traits and environmental conditions influence the strength and direction of frequency dependence of pollination.

The aim of this research project is to investigate the effect of plant frequency on pollination success using a combination of individual-based modelling, a laboratory experiment and a field study. The individual-based approach allows me to model pollinator foraging behaviour in more detail than previous studies and account for limited information in individual decision-making. I then compare the model's predictions to empirical data from a laboratory experiment of bumblebees foraging on artificial flowers, which enables me to control all environmental factors that can influence the foraging decisions of pollinators. In a field study of an entire species-rich plant community in the Fynbos biome of South Africa, I test the model's predictions under more complex natural conditions with frequency variation at multiple spatial scales, and assess the effects of the structure of the plant-pollinator network on flower visitation and seed set in relation to frequency. Overall, this project will help us understand under which conditions pollination by animals promotes or impedes species coexistence in plant communities, and thereby contribute to preserving species-rich communities of flowering plants in a rapidly changing world.

 

Curriculum Vitae

since 2017	PostDoc, University of Freiburg
2012-2017	Lecturer, University of Freiburg
2009-2012	PhD student, University of Würzburg
2008	Internship with Nature Conservation Foundation, Mysore, India
2004-2007	Biology student, University of Würzburg
2002-2004	Biology student, University of Marburg

 

Selected publications

See also Google Scholar and ResearchGate

Maglianesi, M.A., Hanson, P., Brenes, E., Benadi, G., Schleuning, M. & Dalsgaard, B. (2020). High levels of phenological asynchrony between specialized pollinators and plants with relatively short flowering phases. Ecology, in press.

Schwarz, B., Vázquez, D.P., CaraDonna, P.J., Knight, T.M., Benadi, G., Dormann, C.F., Gauzens, B., Motivans, E., Resasco, J., Blüthgen, N., et al. (2020). Temporal scale-dependence of plant–pollinator networks. Oikos 129, 1289–1302.

Benadi, G., & Pauw, A. (2018). Frequency dependence of pollinator visitation rates suggests that pollination niches can allow plant species coexistence. Journal of Ecology 106, 1892–1901.

Benadi, G. & Gegear, R. J. (2018). Adaptive foraging of pollinators can promote pollination of a rare plant species. American Naturalist, 192(2), E81-E92.

Fornoff, F., Klein, A.-M., Hartig, F., Benadi, G., Venjakob, C., Schaefer, H. M. & Ebeling, A. (2017). Functional flower traits and their diversity drive pollinator visitation. Oikos, 126, 1020-1030.

Schleuning, M., Fründ, J., Schweiger, O., Welk, E., Albrecht, J., Albrecht, M., Beil, M., Benadi, G., Blüthgen, N.,  Bruelheide, H., Böhning-Gaese, K., Dehling, M., Dormann, C.F., Exeler, N. Farwig, N., Harpke, A., Hickler, T., Kratochwil, A., Kuhlmann, M., Kühn, I., Michez, D., Mudri-Stojnic, S., Plein, M., Rasmont, P., Schwabe, A., Settele, J.,  Vujic, A., Weiner, C., Wiemers, M., Hof, C. (2016). Ecological networks are more sensitive to plant than to animal extinction under climate change. Nature Communications, 7, 13965.

Benadi, G. (2015). Requirements for plant coexistence through pollination niche partitioning. Proc. R. Soc. B, 282 (1810), 20150117.

Carvalheiro L, Biesmeijer J, Benadi G, Fruend J, Stang M et al. (2014). The potential for indirect effects between co-flowering plants via shared pollinators depends on resource abundance, accessibility and relatedness. Ecology Letters, 17, 1389-1399.

Benadi, G., Hovestadt, T., Poethke, H.-J. & Blüthgen, N. (2014). Specialization and phenological synchrony of plant–pollinator interactions along an altitudinal gradient. Journal of Animal Ecology, 83, 639-650.

Benadi, G., Blüthgen, N., Hovestadt, T. & Poethke, H.-J. (2013). When can plant-pollinator interactions promote plant diversity? American Naturalist, 182, 131-146.


Benadi, G., Blüthgen, N., Hovestadt, T. & Poethke, H.-J. (2012). Population dynamics of plant and pollinator communities: stability reconsidered. American Naturalist, 179, 157-168.