J Ethan Householder

Dr. John Ethan Householder

  • Karlsruher Institut für Technologie (KIT)

    Institut für Geographie und Geoökologie
    Abteilung Aueninstitut
    D-76437 Rastatt

J. Ethan Householder


  • plant ecology
  • community ecology
  • biogeography


2016- Research assistant. Institute of Geography and Geoecology at the Karlsruhe Institute of Technology (KIT).

Research Associate. Botanical Research Institute of Texas (USA, TX).

Contributor of botanical collections, images, metadata and geospatial information for the herbarium.


Scientific Coordinator. Biogeography, community ecology and classification of Mauritia dominated wetlands in the Amazon (Brazil).

Managed and led field investigations regarding vegetation ecology and conservation of palm swamps in Brazilian Amazon.


Ph.D. Ecology. National Institute of Amazonian Research (INPA) (Manaus, Brazil).


Scientific Editor, Freelance (Brazil).

Reviewed scientific manuscripts and proposals in the field of botany, ecology, environmental science and veterinary science. Tasks included translation, statistical design, analysis, writing and editing.


Scientific Coordinator. Pontifica Universidad Catolica del Peru (Peru).

Led research regarding the natural history, ecology, use and conservation of orchids in the Peruvian Amazon.


Research Assistant. Botanical Research Institute of Texas, Andes to Amazon Botany Program (USA, TX).

Assisted in research activities including botanical collection and horticultural research.


Laboratory Professor. Department of Environmental Sciences, Texas Christian University (Fort Worth, TX).

Taught environmental sciencs laboratory to undergraduate students.


Curriculum Developer. Department of Environmental Sciences, Texas Christian University (Fort Worth, TX).

Designed, taught and tested new laboratory manual for undergraduate Environmental Sciences Lab.


M.Sc. in Environmental Sciences. Texas Christian University (Fort Worth, TX).


Laboratory Professor. Department of Biology, Texas Christian University (Fort Worth, TX).

Taught undergraduate students specializing in Medical and Biological sciences. 


Eco-tour Guide Developer. Vila Corcovado Resort (Costa Rica).

Developed and guided innovative ecological tours.


Elementary School Teacher. Alice E Carlson Elementary School (USA, TX).

Developed and taught outdoors ecology and natural history curriculum for elementary students.


Research Assistant. Columbia University (USA, Washington).

Assisted in field investigations of primary and secondary succession on Mt St. Helens.


Columbia University, Biosphere II (Oracle, AZ).

Earth and Environmental Sciences Field Semester.


Academic Tutor. Athletics Department, Texas Christian University (Fort Worth, TX).

Tutored sciene courses for university athletes.


Council on International Educational Exchange (Monteverde, Costa Rica).

Tropical Ecology and Conservation


B.Sc. in Environmental Sciences (Summa Cum Laude). Texas Christian University (Fort Worth, TX).


Householder, J. E.; Wittmann, F.; Schöngart, J.; Piedade, M. T. F.; Junk, W. J.; Latrubesse, E. M.; Quaresma, A. C.; Demarchi, L. O.; Lobo, G. de S.; Aguiar, D. P. P. de; et al. (2024). One sixth of Amazonian tree diversity is dependent on river floodplains. Nature Ecology and Evolution. doi:10.1038/s41559-024-02364-1
Luize, B. G.; Bauman, D.; ter Steege, H.; Palma-Silva, C.; do Amaral, I. L.; de Souza Coelho, L.; de Almeida Matos, F. D.; de Andrade Lima Filho, D.; Salomão, R. P.; Householder, J. E.; et al. (2024). Geography and ecology shape the phylogenetic composition of Amazonian tree communities. Journal of Biogeography. doi:10.1111/jbi.14816
Carvalho, R. L.; Resende, A. F.; Barlow, J.; França, F. M.; Moura, M. R.; Maciel, R.; Alves-Martins, F.; Shutt, J.; Nunes, C. A.; Householder, E.; et al. (2023). Pervasive gaps in Amazonian ecological research. Current Biology, 33 (16), 3495–3504.e4. doi:10.1016/j.cub.2023.06.077
Durgante, F. M.; Higuchi, N.; Ohashi, S.; Householder, J. E.; Lima, A. J. N.; Ishizuka, M.; Wittmann, F.; dos Santos, J.; Carneiro, V. M. C.; Xu, X.; et al. (2023). Soil fertility and drought interact to determine large variations in wood production for a hyperdominant Amazonian tree species. Frontiers in Forests and Global Change, 5, Art.-Nr.: 1065645. doi:10.3389/ffgc.2022.1065645
Peripato, V.; Levis, C.; Moreira, G. A.; Gamerman, D.; ter Steege, H.; Pitman, N. C. A.; Souza, J. G. De; Iriarte, J.; Robinson, M.; Householder, J. E.; et al. (2023). More than 10,000 pre-Columbian earthworks are still hidden throughout Amazonia. Science, 382 (6666), 103–109. doi:10.1126/science.ade2541
Pos, E.; de Souza Coelho, L.; de Andrade Lima Filho, D.; Salomão, R. P.; Amaral, I. L.; Almeida Matos, F. D. De; Castilho, C. V.; Phillips, O. L.; Guevara, J. E.; Householder, J. E.; et al. (2023). Unraveling Amazon tree community assembly using Maximum Information Entropy: a quantitative analysis of tropical forest ecology. Scientific Reports, 13, Art.-Nr.: 2859. doi:10.1038/s41598-023-28132-y
ter Steege, H.; Pitman, N. C. A.; do Amaral, I. L.; de Souza Coelho, L.; de Almeida Matos, F. D.; de Andrade Lima Filho, D.; Salomão, R. P.; Wittmann, F.; Castilho, C. V.; Householder, J. E.; et al. (2023). Mapping density, diversity and species-richness of the Amazon tree flora. Communications Biology, 6 (1), Art.-Nr.: 1130. doi:10.1038/s42003-023-05514-6
Becker, I.; Egger, G.; Gerstner, L.; Householder, J. E.; Damm, C. (2022). Using the River Ecosystem Service Index to evaluate “Free Moving Rivers” restoration measures: A case study on the Ammer river (Bavaria). International review of hydrobiology, 107 (1-2), 117–127. doi:10.1002/iroh.202102088
Correa, D. F.; Stevenson, P. R.; Umaña, M. N.; Coelho, L. de S.; Lima Filho, D. de A.; Salomão, R. P.; do Amaral, I. L.; Wittmann, F.; Matos, F. D. de A.; Householder, J. E.; et al. (2022). Geographic patterns of tree dispersal modes in Amazonia and their ecological correlates. Global Ecology and Biogeography, 32 (1), 49–69. doi:10.1111/geb.13596
Hastie, A.; Honorio Coronado, E. N.; Reyna, J.; Mitchard, E. T. A.; Åkesson, C. M.; Baker, T. R.; Cole, L. E. S.; Oroche, C. J. C.; Dargie, G.; Householder, J. E.; et al. (2022). Risks to carbon storage from land-use change revealed by peat thickness maps of Peru. Nature Geoscience, 15, 369–374. doi:10.1038/s41561-022-00923-4
Wittmann, F.; Householder, J. E.; Piedade, M. T. F.; Schöngart, J.; Demarchi, L. O.; Quaresma, A. C.; Junk, W. J. (2022). A Review of the Ecological and Biogeographic Differences of Amazonian Floodplain Forests. Water, 14 (21), Art.-Nr.: 3360. doi:10.3390/w14213360
Householder, J. E.; Schöngart, J.; Piedade, M. T. F.; Junk, W. J.; Steege, H. ter; Montero, J. C.; Assis, R. L. de; Aguiar, D. P. P. de; Pombo, M. M.; Quaresma, A. C.; et al. (2021). Modeling the Ecological Responses of Tree Species to the Flood Pulse of the Amazon Negro River Floodplains. Frontiers in Ecology and Evolution, 9, Art.-Nr.: 628606. doi:10.3389/fevo.2021.628606
Ochs, K.; Egger, G.; Weber, A.; Ferreira, T.; Householder, J. E.; Schneider, M. (2020). The potential natural vegetation of large river floodplains – From dynamic to static equilibrium. Journal of hydro-environment research, 30, 71–81. doi:10.1016/j.jher.2020.01.005
Lewerentz, A.; Egger, G.; Householder, J. E.; Reid, B.; Braun, A. C.; Garófano-Gómez, V. (2019). Functional assessment of invasive Salix fragilis L. in north-western Patagonian flood plains: A comparative approach. Acta oecologica, 95, 36–44. doi:10.1016/j.actao.2019.01.002
Rocha, M. da; Assis, R. L. de; Piedade, M. T. F.; Feitosa, Y. O.; Householder, J. E.; Lobo, G. D. S.; Demarchi, L. O.; Albuquerque, B. W.; Quaresma, A. C.; Ramos, J. F.; et al. (2019). Thirty years after Balbina Dam: Diversity and floristic composition of the downstream floodplain forest, Central Amazon, Brazil. Ecohydrology, 12 (8), Article No.e2144. doi:10.1002/eco.2144
Gumbricht, T.; Roman-Cuesta, R. M.; Verchot, L.; Herold, M.; Wittmann, F.; Householder, E.; Herold, N.; Murdiyarso, D. (2017). An expert system model for mapping tropical wetlands and peatlands reveals South America as the largest contributor. Global change biology, 23 (9), 3581–3599. doi:10.1111/gcb.13689
Householder, E.; Janovec, J.; Tobler, M. W.; Wittmann, F. (2017). A Diversity of Biogeographies in an Extreme Amazonian Wetland Habitat. Forest Structure, Function and Dynamics in Western Amazonia. Ed.: R.W. Myster, 145–157, Wiley-Blackwell. doi:10.1002/9781119090670.ch7
Lopes, A.; Wittmann, F.; Schöngart, J.; Householder, J. E.; Piedade, M. T. F. (2017). Modeling of regional- and local-scale distribution of the genus Montrichardia Crueg. (Araceae). Hydrobiologia, 789 (1), 45–57. doi:10.1007/s10750-016-2721-y
Wittmann, F.; Householder, E. (2017). Why Rivers Make the Difference: A Review on the Phytogeography of Forested Floodplains in the Amazon Basin. Forest Structure, Function and Dynamics in Western Amazonia. Ed.: R.W. Myster, 125–144, Wiley-Blackwell. doi:10.1002/9781119090670.ch6
Wittmann, F.; Marques, M. C. M.; Damasceno Júnior, G.; Budke, J. C.; Piedade, M. T. F.; Wittmann, A. de O.; Montero, J. C.; Assis, R. L. de; Targhetta, N.; Householder, J. E.; et al. (2017). The Brazilian freshwater wetscape: Changes in tree community diversity and composition on climatic and geographic gradients. PLoS one, 12 (4), Art. Nr.: e0175003. doi:10.1371/journal.pone.0175003
Householder, J. E.; Wittmann, F. (2016). Floristic Diversity of Mauritia flexuosa wetlands in the Brazilian Amazon. Morichales, Cananguchales y otros plamares inundables de Suramerica, Parte II: Colombia, Venezuela, Brasil, Peru, Bolivia, Paraguay, Uruguay y Argentina. Ed.: C.A. Lasso, 241–251.
Householder, J. E.; Wittmann, F.; Tobler, M. W.; Janovec, J. P. (2015). Montane bias in lowland Amazonian peatlands: Plant assembly on heterogeneous landscapes and potential significance to palynological inference. Palaeogeography, palaeoclimatology, palaeoecology, 423, 138–148. doi:10.1016/j.palaeo.2015.01.029
Quaresma, A. C.; Castro, D.; Householder, J. E.; Veiga, J.; Jardim, M. A. G. (2015). As epífitas vasculares em áreas úmidas amazônicas. Conhecendo as áreas úmidas amazônicas: uma viagem pelas várzeas e igapós Eds.: Aline Lopes, Maria Teresa Fernandez Piedade, 95–106, Instituto Nacional de Pesquisas da Amazônia (INPA).
Wittmann, F.; Householder, E.; Lopes, A.; Oliveira Wittmann, A. de; Junk, W. J.; Piedade, M. T. F. (2015). Implementation of the Ramsar Convention on South American wetlands: an update. Research and Reports in Biodiversity Studies, 4, 47–58. doi:10.2147/RRBS.S64502
Maruenda, H.; Lujan Vico, M. del; Householder, J. E.; Janovec, J. P.; Cañari, C.; Naka, A.; Gonzalez, A. E. (2013). Exploration of Vanilla pompona from the Peruvian Amazon as a potential source of vanilla essence: Quantification of phenolics by HPLC-DAD. Food chemistry, 138 (1), 161–167. doi:10.1016/j.foodchem.2012.10.037
Wittmann, F.; Householder, E.; Piedade, M. T. F.; Assis, R. L. de; Schöngart, J.; Parolin, P.; Junk, W. J. (2013). Habitat specifity, endemism and the neotropical distribution of Amazonian white-water floodplain trees. Ecography, 36 (6), 690–707. doi:10.1111/j.1600-0587.2012.07723.x
Wittmann, F.; Householder, J. E.; Piedade, M. T. F.; Parolin, P.; Junk, W. J.; Assis, R. L.; Schöngart, J. (2013). Habitat specificity, endemism and the neotropical distribution of Amazonian white-water floodplain trees. Ecography, 36, 690–707. doi:10.1111/j.1600-0587.2012.f.x
Householder, J. E.; Janovec, J. P.; Tobler, M. W.; Page, S.; Lähteenoja, O. (2012). Peatlands of the Madre de Dios River of Peru: Distribution, Geomorphology, and Habitat Diversity. Wetlands, 32, 359–368. doi:10.1007/s13157-012-0271-2
Dam, A. R. V.; Householder, J. E.; Lubinsky, P. (2010). Vanilla bicolor Lindl. (Orchidaceae) from the Peruvian Amazon: auto-fertilization in Vanilla and notes on floral phenology. Genetic resources and crop evolution, 57 (4), 473–480. doi:10.1007/s10722-010-9540-1
Householder, J. E.; Maruenda, H.; Janovec, J. P.; Mozambite, A. B.; Maceda, J. H.; Wells, J.; Valega, R.; Christenson, E. (2010). Diversity, Natural History, and Conservation of Vanilla (Orchidaceae) in Amazonian Wetlands of Madre de Dios, Peru. Journal of the Botanical Research Institute of Texas, 4, 227–243.