Art and Margaret Herrick Endowed Professor of Plant Biology
My research interests lie in the field of the ecology of plant species redistributions. This includes studying both invasive and encroaching plant species. I am also interested in studying the natural process of succession. Most of my research involves trees. I also study the effects of herbivory by large mammals (such as elephants) on the population biology, community ecology and conservation of plant populations. I firmly believe in the value of field experiments to allow us to gain a mechanistic understanding of the factors that create large-scale vegetation patterns.
CURRENTLY ACCEPTING STUDENTS: PhD student to study the ecology and ecophysiology of encroaching and resident eastern red cedars
Selected Recent Publications
Link to Google Scholar Citations: https://scholar.google.com/citations?user=pTy-CwcAAAAJ&hl=en
Link to ISI list of publications: http://www.researcherid.com/rid/E-9814-2010
Ward, D. 2016. The biology of deserts. Oxford University Press, Oxford, UK. 2nd edition.
- Ward, D., Trinogga, J., Wiegand, K., Du Toit, J., Okubamichael, D., Reinsch, S. & Schleicher, J. 2018. Large shrubs increase soil nutrients in a semi-arid savanna. Geoderma 310: 153-162. [doi: 10.1016/j.geoderma.2017.09.023].
- Ward, D., Kirkman, K., Hagenah, N. & Tsvuura, Z. 2017. Soil respiration declines with increasing nitrogen fertilization and is not related to productivity in long-term grassland experiments. Soil Biology & Biochemistry 115: 415–422. [doi: 10.1016/j.soilbio.2017.08.035].
- Mureva, A. & Ward, D. 2017. Soil microbial biomass and functional diversity in shrub-encroached grasslands along a precipitation gradient. Pedobiologia 63: 37-45. [doi: 10.1016/j.pedobi.2017.06.006].
- Ward, D., Kirkman, K. & Tsvuura, Z. 2017. An African grassland responds similarly to long-term fertilization to the Park Grass experiment. PLoS ONE 12: e0177208. [doi: 10.1371/journal.pone.0177208].
- Ward, D., Muller, K. & Shrader, A.M. 2017. Soil fertility on granite and sedimentary soils is associated with seasonal differences in foraging by elephants. Plant and Soil 413: 73-81. [doi: 10.1007/s11104-016-3067-y].
- Accatino, F., Wiegand, K., Ward, D. & De Michele, C. 2017. Carrying capacity in arid rangelands during droughts: the role of temporal and spatial thresholds. Animal 11: 309-317. [doi: 10.1017/S1751731116001531].
- Griffiths, M.E., Ruiz, N., Ward, D., 2017. Mistletoe species richness patterns are influenced more by host geographic range than nitrogen content. African Journal of Ecology 55, 101–110.
- Okubamichael, D.Y., Griffiths, M.E. & Ward, D. 2016. Host specificity in parasitic plants - perspectives from mistletoes. AoB Plants plw069. [doi: 10.1093/aobpla/plw069].
- Russell, J.M. & Ward, D. 2016. Historical land use and vegetation change in northern KwaZulu-Natal, South Africa. Land Degradation & Development 27: 1691-1699. [doi: 10.1002/ldr.2476].
- Accatino, F., Wiegand, K., Ward, D. & De Michele, C. 2016. Trees, grass, and fire in humid savannas - the importance of life history traits and spatial processes. Ecological Modelling 320: 135-144. F1000Prime Recommended.
- Schmitt, M.H., Ward, D. & Shrader, A.M. 2016. Incorporating secondary metabolites, tannin-binding proteins, and diet breadth into carrying-capacity models for African Elephants. Ecological Modelling 332: 8–18.
- Ward, D. 2016. Clipping frequency but not nutrients affect the architecture and non-structural carbohydrates of a browsing lawn. Plant Ecology 217: 21-29.
- Tjelele, T.J., Ward, D. & Dziba, L.E. 2015. The effects of passage through the gut of goats and cattle, and the application of dung as a fertilizer on seedling establishment of Dichrostachys cinerea and Acacia nilotica. The Rangeland Journal 37: 147–156.
- Tjelele, T.J., Ward, D. & Dziba, L.E. 2015. The effects of seed ingestion by livestock, dung fertilization, trampling, grass competition and fire on seedling establishment of two woody plant species. PLoS ONE 10(2): e0117788. [doi:10.1371/journal.pone.0117788].
- Ford, A.T., Goheen, J.R., Otieno, T.O., Binder, L., Isbell, L., Palmer, T.M., Ward, D., Woodroffe, R. & Pringle, R.M. 2014. Large carnivores make savanna tree communities less thorny. Science 346: 346-349.
- Okubamichael, D.Y., Griffiths, M.E. & Ward, D. 2014. Reciprocal transplant experiment suggests host specificity of the mistletoe Agelanthus natalitius in South Africa. Journal of Tropical Ecology 30: 153-163.
- Russell, J. & Ward, D. 2014. Remote sensing provides a progressive record of vegetation change in northern KwaZulu-Natal, South Africa, from 1944 to 2005. International Journal of Remote Sensing 35: 904-926. [doi: 10.1080/01431161.2013.873154].
- Vadigi, S. & Ward, D. 2014. Herbivory effects on saplings are influenced by nutrients and grass competition in a humid South African savanna. Perspectives in Plant Ecology, Evolution and Systematics 16: 11-20.
- Pillay, T.P. & Ward, D. 2014. Competitive effect and response of savanna tree seedlings: comparison of survival, growth and associated functional traits. Journal of Vegetation Science 25: 226-234.
- Grellier, S., Florsch, N., Janeau, J.-L., Podwojewski, P., Camerlynck, C., Barot, S., Ward, D. & Lorentz, S. 2014. Soil clay influences Acacia encroachment in a South African grassland. Ecohydrology 7: 1474-1484.
|Fall Semester||Spring Semester|
|Odd Years||Even Years||Odd Years||Even Years|
|Plant Ecology (3 Cr.), U/G||Invasion Biology (3 Cr.), U/G||Field Course to South Africa (5 Cr.) U/G||Evolutionary Biology Directed Reading (2 Cr.), G only|
U = undergraduate students G = graduate students