Anna C TREYDTE

  1. Introduction
  2. Publications
  3. Students Supervion
  4. Previous and Current posts

Anna C TREYDTE

2015 – present   Associate professor: Biodiversity Conservation and Ecosystem Management, School of Life Sciences and Bioengineering, Nelson-Mandela African Institution of Science and Technology, Arusha, Tanzania
2013 – present    Adjunct lecturer: Agroecology in the Tropics and Subtropics, University of Hohenheim, Stuttgart, Germany
2013                  Habilitation: Agroecology, University of Hohenheim, Stuttgart, Germany
2004                  PhD: Geobotanical Institute, ETH Zürich, Switzerland; Thesis title: Habitat use of wildlife and diet preferences of the common warthog on a former cattle ranch in a Tanzanian savanna
2000                  MSc: Evolutionary Ecology and Organismal Biology, Ohio State University, Columbus, OH, USA. Thesis title: An Optimal Management Strategy for Arabian Oryx in Mahazat as-Sayd, Saudi Arabia

1998    Vordiplom in Biology; University of Bonn, Germany
  • Ojija F, Treydte AC, Arnold S (2019) Impacts of alien invasive Parthenium hysterophorus on flower visitation by insects to co-flowering plants. Arthropod-Plant Interactions. 10.1007/s11829-019-09701-3
  • Lyakurwa J, Munishi L, Treydte AC (2019) Uzungwa Scarp Nature Forest Reserve; a unique hotspot for reptiles in Tanzania. Acta Herpetologica. 14. doi:10.13128/Acta_Herpetol-25008.
  • Michler L, Treydte AC, Hayat H, Lemke S (2019) Marginalised herders: social dynamics and natural resource use in the fragile environment of the Richtersveld National Park, South Africa. Environmental Development 29: 29-43.
  • Tellmann K, Cotter M, Baumgartner S, Treydte AC, Cadisch G, Asch F (2018) Tipping points in the supply of ecosystem services of a mountainous watershed in South-East Asia. Sustainability 10/7. 2418; https://doi.org/10.3390/su10072418
  • Tuffa S, Hoag D, Treydte AC (2018) Effects of clipping and irrigation on carbon storage in grasses: implications for CO2 emissions in rangelands. Carbon Management 9: 177-186.
  • Tuffa S, Hoag D, Treydte AC (2018) Effects of clipping and irrigation on carbon storage in grasses: implications for CO2 emission mitigation in rangelands. Carbon Management 9: 177-186.
  • Tuffa S, Hoag D, Treydte AC (2017) Clipping and irrigation enhance grass biomass and nutrients: implications for rangeland management. Acta Oecologica 81: 32-39.
  • Tuffa S, Treydte AC (2017) Modeling Boran cattle populations under climate change and varying carrying capacity. Ecological Modelling 352: 113–127.
  • Solomon N, Birhane E, Tadesse T, Treydte AC, Meles K (2017) Carbon stocks and sequestration potential of dry forests under community management in Tigray, Ethiopia. Ecological Processes 6:20. DOI 10.1186/s13717-017-0088-2
  • Treydte AC, Schmiedgen A, Berhane G, Tarekegn K (2017) Rangeland forage availability and management in times of drought – A case study of pastoralists in Afar, Ethiopia. Journal of Arid Environments 139: 67-75.
  • Cotter M, Haeuser I, Harich FK, He P, Sauerborn J, Treydte AC, Martin K, Cadisch G (2017). Biodiversity and ecosystem services – A case study for the assessment of multiple species and functional diversity levels in a cultural landscape. Ecological Indicators 75: 111-117.
  • Birhane E, Treydte AC, Eshete A, Solomon N, Hailemariam M (2017) Can rangelands gain from bush encroachment? Carbon stocks of communal grazing lands invaded by Prosopis juliflora. Journal of Arid Environments 141:60-67.
  • Mmbaga NE, Munishi LK, Treydte AC (2017) Balancing African elephant conservation with human well-being in Rombo area, Tanzania. Advances in Ecology. doi:10.1155/2017/4184261
  • Mmbaga NE, Munishi LK, Treydte AC (2017) How dynamics and drivers of land use/land cover change impact elephant conservation and agricultural livelihood development in Rombo, Tanzania. Journal of Land Use Science 12:168-181.
  • Harich FK, Treydte AC, Ogutu JO, Roberts JE, Savini T, Savini C, Bauer J (2016) Seed dispersal potential of Asian Elephants. Acta Oecologica 77: 144-151.
  • Ngondya IB, Munishi L, Treydte AC, Ndakidemi PA (2016) A Nature-Based Approach for Managing the Invasive Weed Species Gutenbergia cordifolia Sustainably. SpringerPlus Online 5:1787, DOI 10.1186/s40064-016-3480-y.
  • Harich FK, Treydte AC (2016) Mammalian wildlife diversity in rubber and oil palm plantations. CAB Reviews. doi: 10.1079/PAVSNNR201611020
  • Ilukor J, Rettberg S, Treydte AC, Birner R (2016) To eradicate or not to eradicate? Recommendations on Prosopis juliflora management in Afar, Ethiopia, from an interdisciplinary perspective. Pastoralism: Research, Policy and Practice 6: 14-22.
  • Ngondya IB, Munishi L, Treydte AC, Ndakidemi PA (2016) Demonstrative effects of crude extracts of Desmodium spp. to fight against the invasive weed species Tagetes minuta. Acta Ecologica Sinica 36: 113–118.
  • Sandalj M, Treydte AC, Ziegler S (2016) Is wild meat luxury? Quantifying wild meat demand and availability in Hue, Vietnam. Biological Conservation 194: 105–112
  • Yusuf HM, Treydte AC, Sauerborn J (2015) Managing Semi-Arid Rangelands for Carbon Storage: Grazing and Woody Encroachment Effects on Soil Carbon and Nitrogen. PLoS ONE 10: e0109063. doi:10.1371/journal.pone.010906
  • Yayneshet T, Treydte AC (2015) A meta-analysis of the effects of communal livestock grazing on vegetation and soils in sub-Saharan Africa. Journal of Arid Environments 116: 18-24.
  • Baumgartner S, Treydte AC, Grant CC, van Rooyen J (2015) Can diverse herbivore communities increase landscape heterogeneity? Comparing wild and domestic herbivore assemblages in a South African savanna. Perspectives in Plant Ecology, Evolution and Systematics 17: 34-43.
  • Habtemicael M, Yayneshet T, Treydte AC (2015) Responses of vegetation and soils to three grazing management regimes in a semi-arid highland mixed crop-livestock system. African Journal of Ecology 53: 75-82
  • Chutipong W, Tantipisanuh N, Ngoprasert D, Lynam AJ, Steinmetz R, Jenks KE, Grassman LI, Tewes M, Kitamura S, Baker MC, McShea W, Bhumpakphan N, Sukmasuang R, Gale GA, Harich FK, Treydte AC, et al. (2014) Current distribution and conservation status of small carnivores in Thailand: a baseline review. Small Carnivore Conservation 51:96-136.
  • Treydte AC, Baumgartner S, Heitkönig IMA, Grant CC, Getz WM (2013) Herbaceous forage and selection patterns by ungulates across varying herbivore assemblages in a South African savanna. PLoS ONE 8(12): e82831. doi:10.1371/journal.pone.0082831.
  • Treydte AC, Trumpf P, Langenberger G, Yang Y, Liu F (2013) Wild Ungulate Distribution in the Naban River Watershed National Nature Reserve, Southwest China. Journal of Tropical Forestry and Environment 3: 53-65.
  • Harich F, Owusu S, Ogutu J, Sauerborn J, Treydte AC (2013) People and wildlife: Conflicts arising around the Bia Conservation Area in Ghana. Journal of Nature Conservation 21: 342-349.
  • Haftay H, Yayneshet T, Animut G, Treydte AC (2013) Rangeland vegetation responses to traditional enclosure management in eastern Ethiopia. The Rangeland Journal 35: 29-36.
  • Yusuf HM, Treydte AC, Abule E, Sauerborn J (2013) Predicting aboveground biomass of encroacher woody vegetation in semi-arid Borana rangelands, Ethiopia. Journal of Arid Environments 96: 64-72.
  • McGeogh-Porensky L, Bucher SF, Veblen K, Treydte AC, Young TP (2013) Large herbivores alter edge effects around ecosystem hotspots in an African savanna. Journal of Arid Environments 96: 55-63.
  • Atanga NL, Treydte AC, Birner R (2013) Assessing the sustainability of different small-scale livestock production systems in Afar, Ethiopia. LAND 2: 726-755.
  • Österle N, Angassa A, Tadesse A, Ebro A, Sauerborn J, Treydte AC (2012) Crop-livestock farming systems varying with different altitudes in Southern Ethiopia. Science, Technology and Arts Research Journal 1: 01-13.
  • Angassa A, Sheleme B, Oba G, Treydte AC, Sauerborn J (2012) Land use changes induce soil nutrients in the savannas of southern Ethiopia. Journal of Arid Environments 81: 67-76.
  • Treydte AC, Lamers M, Salvatierra A (2011) Modeling llama population development under socio-economic and environmental constraints in the Bolivian Highlands. Journal of Ecological Modelling 222: 3157-3165.
  • Yusuf HM, Treydte AC, Demissew S, Woldu Z (2011) Assessment of woody species encroachment in the grasslands of Nechisar National Park, Ethiopia. African Journal of Ecology 49: 397-409.
  • Hassen A, Ebro A, Kurtu M, Treydte AC (2011) Livestock feed resources utilization and management as influenced by altitude in the Central Highlands of Ethiopia. Livestock Research for Rural Development 22 (12): 2012. www.lrrd.org/lrrd22/12/hass22229.htm.
  • Treydte AC, van der Beek JGM, Perdok AA, van Wieren SE (2011) Grazing ungulates select for grasses growing beneath trees in African savannas. Mammalian Biology 76: 345-350.
  • Treydte AC, Riginos C, Jeltsch F (2010) Enhanced use of beneath-canopy vegetation by grazing ungulates in African savannahs. Journal of Arid Environments 74: 1597-1603.
  • Angassa A, Oba G, Treydte AC, Weladji RB (2010) Role of traditional enclosures on the diversity of herbaceous vegetation in a semi-arid rangeland, southern Ethiopia. Livestock Research for Rural Development 22 (9): 163. www.lrrd.org/lrrd22/9/anga22163.htm.
  • Körner K, Treydte AC, Burkart M, Jeltsch F (2010) Simulating direct and indirect effects of climatic changes on rare perennial plant species in fragmented landscapes. Journal of Vegetation Science 21: 843-856.
  • Treydte AC, Grant CC, Jeltsch F (2009) Tree size and herbivory determine the below-canopy grass quality and species composition in savannahs. Biodiversity and Conservation 14: 3989-4002
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  • Treydte AC, Heitkönig IMA, Ludwig F (2009) Modelling ungulate dependence on higher quality forage under large trees in African savannahs. Basic and Applied Ecology 10: 161-169.
  • Treydte AC, Looringh van Beeck F, Ludwig F, Heitkönig IMA (2008) Improved beneath-crown grass quality in South African savannas varying locally and over season. Journal of Vegetation Science 19: 663-670.
  • Treydte AC, Heitkönig IMA, Prins HHT, Ludwig F (2007) Trees enhance grass layer quality in African savannas of distinct rainfall and soil fertility. Perspectives in Plant Ecology, Evolution and Systematics 8: 197-205.
  • Treydte AC, Bernasconi SM, Kreuzer M, Edwards PJ (2006) Diet preferences of the common warthog on nutrient enriched former cattle grounds on a coastal savanna in Tanzania. Journal of Mammalogy 87: 889-898.
  • Treydte AC, Halsdorf SA, Weber E, Edwards PJ (2006) Habitat preferences of the warthog on a former cattle ranch in Tanzania. Journal of Wildlife Management 70: 1285-1292.
  • Treydte AC, Edwards PJ, Suter W (2005) Shifts in native ungulate communities on a former cattle ranch in Tanzania. African Journal of Ecology 43: 302-311.
  • Treydte AC, Williams JB, Bedin E, Ostrowski S, Seddon PJ, Marschall EA, Waite TA, Ismail K (2001) In search of the optimal management strategy for Arabian oryx. Animal Conservation 4: 239-249.

2018 – present A. Asenga, MSc thesis: Spatial Component of Woody encroachment: Impacts on Plant Functional Groups and Predators (NM-AIST and MaswaGR)
2018 – present  G. Nchimbi, MSc thesis: Re-colonization of flora and fauna in the post mining area of Lake Manyara National Park, Tanzania (NM-AIST and TANAPA)
2018 – present  W. Kananga, MSc thesis: Managing the invasive plant Parthenium hysterophorus and its socio-economic impact on local communities in Arusha, Tanzania (NM-AIST and TPRI)
2018 – present  N. Felix, MSc thesis: Effects of retaliatory killing on the dynamics of male lion coalitions: a case study in Tarangire Manyara Ecosystem (NM-AIST and TAWIRI)
2018 – present  R. Mapunda, PhD thesis: Evaluating the status of the endangered Usambara Akalat (Sheppardia montana), in an eastern Afro-montane hotspot, Tanzania (NM-AIST and UDSM)
2018 – present  E. Mohammed, PhD thesis: Effects of overgrazing and illegal harvesting on the regeneration and ecology of Balanites aegyptiaca and Ziziphus spina-christi in Dinder Biosphere Reserve, Sudan (NM-AIST and University of Khartoum)
2018 – present  P. Shayo, PhD thesis: The contribution of oysternuts (Telfairia pedata)  to biodiversity conservation and improved community livelihoods in northern Tanzania (NM-AIST and Sokoine University of Agriculture)
2018 – present  F. Thomas, PhD thesis: The role of rangeland pollinators for pastoralist livelihoods in northern Tanzania (NM-AIST and Ministry of Agriculture)
2017 – present MA Garko, PhD thesis: Can native woody species compete with exotics in their ecosystem functions and economic benefits? A case study of the Sudan Savanna, Nigeria (NM-AIST and University of Nigeria)
2017 – present  F. Ojija, PhD thesis: Invasive species impact on insect functional groups – the case study of Lantana camara in Tanzania (NM-AIST and Greenwich University)
2017 – present  C. Leweri, PhD thesis: Pastoralism and wildlife conservation in the face of climate change: will shifts in movement patterns and herding strategies resolve conflicts? (NM-AIST and NCAA)
2017 – present S. Abihudi, PhD thesis: Phylogenetic relationships, occurrence and sustainable harvesting of Aloe spp. in Tanzania (NM-AIST and University of Uppsala)
2017 – 2019     H. Kimaro, MSc thesis: The dynamics of bush encroachment through Acacia drepanolobium  in the Mara Region, Tanzania (NM-AIST and Wake Forest University)
2017 – 2019     J. Lyakurwa, MSc thesis: How humans impact the habitat structure for reptiles in the Uzungwa Scarp Forest Reserve (NM-AIST)
2017 – 2019     A. Baltazary, MSc thesis: Wildlife-livestock interaction: is the feeding behaviour of wildlife influenced by livestock? (NM-AIST and Norwegian Technical University)
2015 – present  G. Mayengo, PhD thesis: Understanding the importance of termite mounds and other nutrient hotspots for ungulates in the Issa Valley, Tanzania (NM-AIST and University of Liverpool)
2014 – 2017     N. Emmanuel, PhD thesis: Drivers of human-elephant conflicts and their management implications: a case of Rombo area, Kilimanjaro, Tanzania (NM-AIST)
2014 – 2017     I. Ngondya, PhD thesis: Invasive species management for sustainable ecosystem conservation in the Ngorongoro Ecosystem, Tanzania (NM-AIST)

Teaching at NM-AIST

Strategic Conservation Planning, MSc Module LiSE 6332
Conservation Biogeography, MSc-Module LiSE  6265
Restoration Ecology, PhD-Module LiSE 7265
Population Ecology and Modelling LiSE 7263

Employment record
2015 – present   Associate professor: Biodiversity Conservation and Ecosystem Management, School of Life Science and Bioengineering, Nelson-Mandela African Institution of Science and Technology, Arusha, Tanzania
2016 – present    Deputy Centre Leader: World Bank project on the African Centre of Excellence, CREATES (Centre for REsearch, Agricultural advancement, Teaching Excellence and Sustainability) NM-AIST, Arusha, Tanzania
2013 – present    Adjunct lecturer: Agroecology in the Tropics and Subtropics, University of Hohenheim, Stuttgart, Germany
2013 – 2016       Consultant: BMZ / GIZ projects on drought resilience and Prosopis spp. invasion in the Afar region, Ethiopia
2013 – 2016       Station manager: DFG Kili FOR 1246; Nkweseko, Kilimanjaro, Tanzania and Dept. of Zoology, University of Würzburg, Germany
2008 – 2013       Lecturer: Agroecology in the Tropics and Subtropics, University of Hohenheim, Stuttgart, Germany
2007 – 2008       Post-doc: Plant Ecology and Nature Conservation, University of Potsdam, Germany (host: F. Jeltsch) and Mpala Research Centre, Laikipia, Kenya
2007 – 2008       Research assistant: BIOTA South (Biodiversity Transect Africa), Plant Ecology and Nature Conservation, University of Potsdam, Germany
2005 – 2007       Post-doc: Resource Ecology, Wageningen University, Wageningen, The Netherlands (host: H.H.T. Prins)
2004 – 2005       Scientific assistant: EcoStrat ecological agency (GMO risk assessment), Zürich, Switzerland
2004 – 2005       Administrative assistant: University of Applied Sciences in Educating Children with Learning Difficulties, HFH Zürich, Switzerland
2001 – 2004       Research station manager: supervising staff members and students at Mkwaja Ranch, Tanga, Tanzania

Field of expertise
Prof. Anna’s overarching research questions are: What drives land degradation and biodiversity declines in and around cultivated and protected landscapes? How do plants and animals respond to these phenomena? How can we sustainably use our natural resources and their ecosystem services and functions?
Anna’s research is situated at the interface between human agricultural and infrastructure activities and the natural processes occurring in protected/undisturbed areas. Her research investigates and strives to design our future human-dominated landscapes for potential livelihood benefits and productivity gains without compromising on natural biodiversity. Her current and future research activities focus on how human land use and climate change affect our natural resources, i.e., the ecosystem services and functions deriving from biodiversity. Main research topics encompass:
1) With increasing climatic extremes (droughts, higher temperatures) as well as enhanced human activities, invasive species might benefit and outcompete native species. Understanding their spread and competitive success is needed to find effective control mechanisms. Anna’s research comprises experiments on management and field observations. Her current work on invasives includes studies on how these plant species affect native plant and animal species, models on how this species will spread in the future as well as novel management technologies to suppress and mitigate the current invasion.
2) Invading woody vegetation further alters micro- and macro-climatic characteristics of landscapes. Anna’s research on woody encroachment patterns into open grasslands / savanna habitats in eastern and southern Africa has shown how woody vegetation impacts nutrients, biomass and carbon stocks in sub-canopy plants and soils as well as associated wild and domestic herbivores.
3) Anna’s studies have highlighted parallels on how domestic and wild herbivores alter habitat structure and functions through herbivory. Using livestock from overgrazed areas to improve nutrient cycles of underutilized protected lands promises a relieve for ever-declining pastoral areas and a support for local pastoralism adjacent to protected areas if managed accordingly. She investigates rangeland management approaches that help restoring non-usable grounds while maximizing vegetation and livestock productivity.
4) Anna’s research on restoration and rehabilitation through nutrient improvement and water-conserving practices using dung as manure and inclusion of woody vegetation in cultivated areas will help improving cultivation yields and livestock productivity. Fostering and maintaining diversity in agro-ecological landscapes such as including underutilized plant species will help enhance livelihoods and income generation of small-scale farmers and pastoralists.
5) Human-wildlife conflicts around protected areas particularly impact small-scale farmers. Crop-raiding and severe damage to humans and their livelihoods has become more frequent in times of land-use pressure and climate change. Anna’s research has investigated wildlife movement patterns, located spatial and temporal conflict hotspots and provided suitable buffer zone / corridor designs.
6) Anna is further part of a team working on the establishment and maintenance of a Botanical Garden at NM-AIST, which includes native and endemic plant species that are important for medicinal purposes as well as for natural extracts to reduce pesticide or invasive species infestation. This is done in collaboration with the Tropical Pesticides Institute (TPRI) as well as the Natural History Museum in Arusha, Tanzania.

Research funds
Prof. Anna has successfully acquired a number of grants , summing up to more than 6 Mill US$, from the World Bank, Humboldt Foundation, German Research Foundation (DFG), Swiss National Foundation (SNF), National Science Foundation USA, National Geographic, Rufford Foundation, IDEA WILD, Hans-Boeckler Foundation, Heinrich Boell Foundation, Bundesministerium fuer Bildung und Forschung (BMBF, BMZ, GIZ), German Academic Exchange (DAAD) and others.

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