David Mercer Ward

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  • 2018 | Journal Article | Research Paper
    ​ ​Large shrubs increase soil nutrients in a semi-arid savanna​
    Ward, D. ; Trinogga, J.; Wiegand, K. ; du Toit, J.; Okubamichael, D.; Reinsch, S. & Schleicher, J.​ (2018) 
    Geoderma, 310 pp. 153​-162​.​ DOI: https://doi.org/10.1016/j.geoderma.2017.09.023 
    ​Details  DOI 
  • 2017 | Journal Article | Research Paper | 
    ​ ​Carrying capacity in arid rangelands during droughts: the role of temporal and spatial thresholds​
    Accatino, F. ; Ward, D. ; Wiegand, K.   & De Michele, C.​ (2017) 
    Animal, 11(2) pp. 309​-317​.​ DOI: https://doi.org/10.1017/s1751731116001531 
    ​Details  DOI  PMID  PMC 
  • 2015 | Journal Article | Research Paper
    ​ ​Trees, grass, and fire in humid savannas: ​The importance of life history traits and spatial processes​
    Accatino, F. ; Wiegand, K. ; Ward, D.   & Michele, C. de​ (2015) 
    Ecological Modelling, 320 pp. 135​-144​.​ DOI: https://doi.org/10.1016/j.ecolmodel.2015.09.014 
    ​Details  DOI 
  • 2014 | Journal Article | Research Paper
    ​ ​Robustness and management adaptability in tropical rangelands: a viability-based assessment under the non-equilibrium paradigm​
    Accatino, F. ; Sabatier, R. ; Michele, C. de; Ward, D. ; Wiegand, K.   & Meyer, K. M. ​ (2014) 
    Animal, 8(8) pp. 1272​-1281​.​ DOI: https://doi.org/10.1017/s1751731114000913 10.1017/S1751731114000913 
    ​Details  DOI; DOI  PMID  PMC 
  • 2012 | Journal Article | Research Paper | 
    ​ ​Walter’s two-layer hypothesis revisited: back to the roots!​
    Ward, D. ; Wiegand, K.   & Getzin, S. ​ (2012) 
    Oecologia, 172(3) pp. 617​-630​.​ DOI: https://doi.org/10.1007/s00442-012-2538-y 
    ​Details  DOI 
  • 2011 | Journal Article | Research Paper
    ​ ​Disentangling facilitation and seed dispersal from environmental heterogeneity as mechanisms generating associations between savanna plants​
    Schleicher, J.; Meyer, K. M. ; Wiegand, K. ; Schurr, F. M. & Ward, D. ​ (2011) 
    Journal of Vegetation Science, 22(6) pp. 1038​-1048​.​ DOI: https://doi.org/10.1111/j.1654-1103.2011.01310.x 
    ​Details  DOI 
  • 2011 | Journal Article | Research Paper
    ​ ​Interaction between ungulates and bruchid beetles and its effect on Acacia trees: modeling the costs and benefits of seed dispersal to plant demography​
    Rodríguez-Pérez, J. ; Wiegand, K.   & Ward, D. ​ (2011) 
    Oecologia, 167(1) pp. 97​-105​.​ DOI: https://doi.org/10.1007/s00442-011-1964-6 
    ​Details  DOI 
  • 2010 | Book Chapter
    ​ ​Spatially Explicit Modeling of Savanna Processes​
    Meyer, K. M. ; Wiegand, K.  & Ward, D. ​ (2010)
    In:​Hill, Michael J.; Hanan, Niall P.​ (Eds.), Ecosystem Function in Savannas: Measurement and Modeling at Landscape to Global Scales pp. 273​-291. (Vol. 17). ​CRC Press. DOI: https://doi.org/10.1201/b10275-19 
    ​Details  DOI 
  • 2010 | Book Chapter
    ​ ​Spatially explicit modelling of savanna processes​
    Meyer, K. M. ; Wiegand, K.  & Ward, D. ​ (2010)
    In:​Hill, M. J.; Hanan, M. P.​ (Eds.), Ecosystem Function in Savannas: Measurement and Modeling at Landscape to Global Scales. ​Taylor & Francis.
    ​Details 
  • 2010 | Journal Article | Research Paper
    ​ ​Learning new tricks from old trees: revisiting the savanna question​
    Moustakas, A. ; Wiegand, K. ; Meyer, K. M. ; Ward, D.   & Sankaran, M.​ (2010) 
    Frontiers of Biogeography, 2(2) pp. 47​-53​.​ DOI: https://doi.org/10.21425/F5FBG12335 
    ​Details  DOI 
  • 2010 | Journal Article | Research Paper
    ​ ​Changes of woody plant interaction and spatial distribution between rocky and sandy soil areas in a semi-arid savanna, South Africa​
    Schleicher, J.; Wiegand, K.   & Ward, D. ​ (2010) 
    Journal of Arid Environments, 75(3) pp. 270​-278​.​ DOI: https://doi.org/10.1016/j.jaridenv.2010.10.003 
    ​Details  DOI 
  • 2009 | Journal Article | Research Paper
    ​ ​Do Acacia and Tamarix trees compete for water in the Negev desert?​
    Sher, A. A.; Wiegand, K.   & Ward, D. ​ (2009) 
    Journal of Arid Environments, 74(3) pp. 338​-343​.​ DOI: https://doi.org/10.1016/j.jaridenv.2009.09.007 
    ​Details  DOI 
  • 2009 | Journal Article | Research Paper
    ​ ​Patch dynamics integrate mechanisms for savanna tree–grass coexistence​
    Meyer, K. M. ; Wiegand, K.   & Ward, D. ​ (2009) 
    Basic and Applied Ecology, 10(6) pp. 491​-499​.​ DOI: https://doi.org/10.1016/j.baae.2008.12.003 
    ​Details  DOI 
  • 2009 | Journal Article | Research Paper
    ​ ​Are savannas patch-dynamic systems? A landscape model​
    Moustakas, A. ; Sakkos, K.; Wiegand, K. ; Ward, D. ; Meyer, K. M.   & Eisinger, D.​ (2009) 
    Ecological Modelling, 220(24) pp. 3576​-3588​.​ DOI: https://doi.org/10.1016/j.ecolmodel.2009.06.036 
    ​Details  DOI 
  • 2009 | Journal Article | Research Paper
    ​ ​Multi-scale patterns and bush encroachment in an arid savanna with a shallow soil layer​
    Wiegand, K. ; Ward, D.   & Saltz, D.​ (2009) 
    Journal of Vegetation Science, 16(3) pp. 311​-320​.​ DOI: https://doi.org/10.1111/j.1654-1103.2005.tb02369.x 
    ​Details  DOI 
  • 2008 | Journal Article | Research Paper
    ​ ​The role of size inequality in self-thinning: A pattern-oriented simulation model for arid savannas​
    Wiegand, K. ; Saltz, D.; Ward, D.   & Levin, S. A.​ (2008) 
    Ecological Modelling, 210(4) pp. 431​-445​.​ DOI: https://doi.org/10.1016/j.ecolmodel.2007.08.027 
    ​Details  DOI 
  • 2008 | Journal Article | Research Paper
    ​ ​Spacing patterns of an Acacia tree in the Kalahari over a 61-year period: How clumped becomes regular and vice versa​
    Moustakas, A. ; Wiegand, K. ; Getzin, S. ; Ward, D. ; Meyer, K. M. ; Guenther, M. & Mueller, K.-H.​ (2008) 
    Acta Oecologica, 33(3) pp. 355​-364​.​ DOI: https://doi.org/10.1016/j.actao.2008.01.008 
    ​Details  DOI 
  • 2007 | Journal Article | Research Paper
    ​ ​Determining patch size​
    Meyer, K. M. ; Wiegand, K. ; Ward, D.   & Moustakas, A. ​ (2007) 
    African Journal of Ecology, 46(3) pp. 440​-442​.​ DOI: https://doi.org/10.1111/j.1365-2028.2007.00834.x 
    ​Details  DOI 
  • 2007 | Journal Article | Research Paper
    ​ ​SATCHMO: A spatial simulation model of growth, competition, and mortality in cycling savanna patches​
    Meyer, K. M. ; Wiegand, K. ; Ward, D.   & Moustakas, A. ​ (2007) 
    Ecological Modelling, 209(2-4) pp. 377​-391​.​ DOI: https://doi.org/10.1016/j.ecolmodel.2007.07.001 
    ​Details  DOI 
  • 2007 | Journal Article | Research Paper
    ​ ​The rhythm of savanna patch dynamics​
    Meyer, K. M. ; Wiegand, K. ; Ward, D.   & Moustakas, A. ​ (2007) 
    Journal of Ecology, 95(6) pp. 1306​-1315​.​ DOI: https://doi.org/10.1111/j.1365-2745.2007.01289.x 
    ​Details  DOI 
  • 2007 | Journal Article | Research Paper
    ​ ​Multi-proxy evidence for competition between savanna woody species​
    Meyer, K. M. ; Ward, D. ; Wiegand, K.   & Moustakas, A. ​ (2007) 
    Perspectives in Plant Ecology, Evolution and Systematics, 10(1) pp. 63​-72​.​ DOI: https://doi.org/10.1016/j.ppees.2007.09.002 
    ​Details  DOI 
  • 2006 | Journal Article | Research Paper
    ​ ​Long-term mortality patterns of the deep-rooted Acacia erioloba: The middle class shall die!​
    Moustakas, A. ; Guenther, M.; Wiegand, K. ; Mueller, K.-H.; Ward, D. ; Meyer, K. M.   & Jeltsch, F.​ (2006) 
    Journal of Vegetation Science, 17(4) art. 473​.​ DOI: https://doi.org/10.1111/j.1654-1103.2006.tb02468.x 
    ​Details  DOI 
  • 2005 | Journal Article | Research Paper
    ​ ​A patch-dynamics approach to savanna dynamics and woody plant encroachment – Insights from an arid savanna​
    Wiegand, K. ; Saltz, D. & Ward, D. ​ (2005) 
    Perspectives in Plant Ecology, Evolution and Systematics, 7(4) pp. 229​-242​.​ DOI: https://doi.org/10.1016/j.ppees.2005.10.001 
    ​Details  DOI 
  • 2005 | Journal Article | Research Paper
    ​ ​Big is not better: small Acacia mellifera shrubs are more vital after fire​
    Meyer, K. M. ; Ward, D. ; Moustakas, A.   & Wiegand, K. ​ (2005) 
    African Journal of Ecology, 43(2) pp. 131​-136​.​ DOI: https://doi.org/10.1111/j.1365-2028.2005.00559.x 
    ​Details  DOI 
  • 2004 | Journal Article | Research Paper
    ​ ​Minimum recruitment frequency in plants with episodic recruitment​
    Wiegand, K. ; Jeltsch, F. & Ward, D. ​ (2004) 
    Oecologia, 141(2) pp. 363​-372​.​ DOI: https://doi.org/10.1007/s00442-003-1439-5 
    ​Details  DOI  PMID  PMC 
  • 2003 | Journal Article | Research Paper
    ​ ​From snapshot information to long-term population dynamics of Acacias by a simulation model​
    Wiegand, K. ; Ward, D. ; Thulke, H.-H. & Jeltsch, F.​ (2003) 
    Plant Ecology, 150(1/2) pp. 97​-114​.​ DOI: https://doi.org/10.1023/a:1026574303048 
    ​Details  DOI 
  • 2000 | Journal Article | Research Paper
    ​ ​Do spatial effects play a role in the spatial distribution of desert-dwelling Acacia raddiana?​
    Wiegand, K. ; Jeltsch, F. & Ward, D. ​ (2000) 
    Journal of Vegetation Science, 11(4) pp. 473​-484​.​ DOI: https://doi.org/10.2307/3246577 
    ​Details  DOI 
  • 2000 | Journal Article | Research Paper
    ​ ​Linking a spatially-explicit model of acacias to GIS and remotely-sensed data​
    Wiegand, K. ; Jeltsch, F.; Ward, D.   & Schmidt, H.​ (2000) 
    Folia Geobotanica, 35(2) pp. 211​-230​.​ DOI: https://doi.org/10.1007/bf02803099 
    ​Details  DOI 
  • 1999 | Journal Article | Research Paper
    ​ ​Analysis of the population dynamics of $ trees in the Negev desert, Israel with a spatially-explicit computer simulation model​
    Wiegand, K. ; Jeltsch, F. & Ward, D. ​ (1999) 
    Ecological Modelling, 117(2-3) pp. 203​-224​.​ DOI: https://doi.org/10.1016/s0304-3800(98)00199-9 
    ​Details  DOI 
  • 1997 | Journal Article | Research Paper
    ​ ​Untersuchungen zur Auswirkung von Strassen auf das Überleben der Akazien im Negev​
    Wiegand, K. ; Jeltsch, F. & Ward, D. ​ (1997) 
    Verhandlungen der Gesellschaft für Ökologie, 28 pp. 499​-506​.​
    ​Details 

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