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Theory at the service of conservation


About

Tanjona

I am a Malagasy ecologist and develop mathematical and statistical models to better understand patterns and processes of biodiversity loss. I obtained a MSc in applied mathematics with Arthur Randrianarivony at the University of Antananarivo. I did a PhD with Ilkka Hanksi and Otso Ovaskainen at the University of Helsinki. I completed a first postdoc with Emma Goldberg at the University of Minnesota, and a second postdoc with Anthony Ives and Monica G. Turner at the University of Wisconsin-Madison (ACES), and is doing a third postdoc with Benjamin Roche at the University of Montpellier on COVID-19 modeling. I am the Scientific Director of Madagascar Biodiversity Center since 2023, and a Honorary Fellow of the University of Wisconsin-Madison since 2019.



Research

Text in progress ...


Publications and in prep.

Published

  1. Ramiadantsoa, T., Amady, A., Phillipart, M., Tombozara. M, Lucas, V. & Fisher, B.L. (2026). Optimizing Black Soldier Fly Frass fertilizer rates for maize and soybean production in Madagascar. In press. Plos one
  2. Andriambelo, F. F. H., Solofondranohatra, C. L., Ramiadantsoa, T. & Fisher, B. L. (2026). Field evaluation of composted black soldier fly frass as a soil amendment for restoration of Dodonaea madagascariensis (Sapindaceae) in Madagascar. In press. Sustainability
  3. Raharimandimby, T. M., Ramiadantsoa, T., Kelstrup, H. C., Hugel, S., Fisher, B. L. (2026). Effect of supplementing a cricket diet with cooked green beans, a discarded agro‑industrial material, on performance of Gryllus madagascarensis at two rearing densities. Insects, 17, 411. DOI
  4. Solofondranohatra, C. L., Ramiadantsoa, T., Hugel, S. & Fisher, B. L. (2025). Black soldier fly frass fertilizer outperform traditional fertilizers in terms of plant growth in restoration in Madagascar. Sustainability, 17(15), 7152.DOI
  5. Phelps, L. N., Razanatsoa, E., Davis, D., Hackel, J., Rasolondrainy, T., Tiley, G. P., …, Ramiadantsoa, T., …, Vorontsova, M. S., Douglass, K. & Lehmann, C. (2025). Advancing transdisciplinary research on grassy biomes to support resilience in ecosystems and livelihoods. Ecological Monographs, 95(2), e70011. DOI
  6. Kostandova, N., ..., Ramiadantsoa, T., ..., Wesolowski, A. (2024). A systematic review of using population-level human mobility data to understand SARS-CoV-2 transmission. Nature Communications, 15, 10504, DOI
  7. Rakotondrasoa, J. F., Ramiadantsoa, T. , Becker, L. J., Ravelomanana, A., Van Itterbeeck, J., Hugel, S. & Fisher, B. L. (2024). Education: an efficient tool to increase the willingness of children to consume farmed cricket in Madagascar. Journal of Insects as Food and Feed, 11(3), 455-468, DOI
  8. Rasoarimalala N. F., Ramiadantsoa, T. , Rakotonirina, J. C. & Fisher, B. F. (2024). Linear morphometry of male genitalia distinguishes the ant genera Monomorium and yllophopsis S (Hymenoptera: Formicidae) in Madagascar. Insects, 15(8), 605. DOI
  9. Solofondranohatra, C. L., Andrianorosoa, C. T. O., Ramiadantsoa.T, Ravelomanana, A., Ramanampamonjy, R. N., Hugel, S. & Fisher, B. L. (2024). Effect of Cricket Frass Fertilizer on growth and pod production of green beans (Phaseolus vulgaris L.). Plos one, 19(5), e0303080. DOI
  10. Ramiadantsoa.T, Ratajczak, Z. & Turner, M. G. (2023). Regeneration strategies and forest resilience to changing fire regimes: insights from a Goldilocks model. Ecology, 104(6), e4041. DOI
  11. Evans, M. V., Ramiadantsoa.T, Kauffman, K., Moody, J., Nunn, C. L., Rabezara, J. Y., ... & Roche, B. (2023). Sociodemographic Variables Can Guide Prioritized Testing Strategies for Epidemic Control in Resource-Limited Contexts. The Journal of Infectious Diseases, 228(9), 1189-1197. DOI
  12. Twombly, S., Hastings, A., Miller, T., Cortez, M., Abbott, K., Ramiadantsoa.T, Blackwood, J., & Prosper, O. (2022). New Theory for Increasingly Tangled Banks. Issues in Science and Technology, 38(4), 39-44
  13. Rasambainarivo, F., Ramiadantsoa.T, Raherinandrasana, A., Randrianarisoa, S., Rice, B. L., Evans, M. V., Roche, B., Randriatsarafara, F. M., Wesolowski, A. & Metcalf, J. C. (2022). Prioritizing COVID-19 vaccination efforts and dose allocation within Madagascar. BMC Public Health, 22(1), 724. DOI
  14. Ramiadantsoa.T, Metcalf, C. J. E., Raherinandrasana, A. H., Randrianarisoa, S., Rice, B. L., Wesolowski, A., Randriatsarafara, F. M. & Rasambainarivo, F. (2022). Existing human mobility data sources poorly predicted the spatial spread of SARS-CoV-2 in Madagascar. Epidemics, 38, 100534. DOI
  15. Perrotti, A. G., Ramiadantsoa.T, O'Keefe, J. & Otaño, N. N. (2022). Uncertainty in coprophilous fungal spore concentration estimates. Frontiers in Ecology and Evolution, 10, 1086109. DOI
  16. Culbertson, K. A., Treuer, T. L. H., Mondragon-Botero, A., Ramiadantsoa, T. & Reid, J. L. (2022). The eco-evolutionary history of Madagascar presents unique challenges to tropical forest restoration. Biotropica, 54(4), 1081-1102. DOI
  17. Rice, B. L., ..., Ramiadantsoa, T., Rasambainarivo, F., Yu, W., Grenfell, B. T., Tatem, A. J. & Metcalf, C. J. E. (2021). Variation in SARS-CoV-2 outbreaks across sub-Saharan Africa. Nature Medicine, 27(3), 447-453. DOI
  18. Rasambainarivo, F., Rasoanomenjanahary, A., Rabarison, J. H., Ramiadantsoa, T., Ratovoson, R., Randremanana, R., Randrianarisoa, S., Rajeev, M., Masquelier, B., Heraud, J. M., Metcalf, C. J. E. & Rice, B. L. (2021). Monitoring for outbreak-associated excess mortality in an African city: Detection limits in Antananarivo, Madagascar. International Journal of Infectious Diseases, 103, 338-342. DOI
  19. Ramiadantsoa, T. & Solofondranohatra, C. L. (2021). Nontrivial responses of vegetation to compound disturbances: A case of Malagasy grassland. Malagasy Nature, 15, 29-40
  20. McCary, M. A., Phillips, J. S., Ramiadantsoa, T., Nell, L. A., McCormick, A. R. & Botsch, J. C. (2021). Transient top-down and bottom-up effects of resources pulsed to multiple trophic levels. Ecology, 102(1). DOI
  21. Kucharik, C. J., Ramiadantsoa, T., Zhang, J. & Ives, A. R. (2020). Spatiotemporal trends in crop yields, yield variability, and yield gaps across the USA. Crop Science, 60(4), 2085-2101. DOI
  22. Ramiadantsoa, T., Stegner, M. A., Williams, J. W. & Ives, A. R. (2019). The potential role of intrinsic processes in generating abrupt and quasi-synchronous tree declines during the Holocene. Ecology, 100(2). DOI
  23. Ratajczak, Z., Carpenter, S. R., Ives, A. R., Kucharik, C. J., Ramiadantsoa, T., Stegner, M. A., Williams, J. W., Zhang, J. & Turner, M. G. (2018). Abrupt Change in Ecological Systems: Inference and Diagnosis. Trends in Ecology & Evolution, 33(7), 513-526. DOI
  24. Ramiadantsoa, T., Hanski, I. & Ovaskainen, O. 2018. Responses of generalist and specialist species to fragmented landscapes. Theoretical Population Biology, 124, 31-40. DOI
  25. Ihantamalala, F. A., Rakotoarimanana, F. M. J., Ramiadantsoa, T., Rakotondramanga, J. M., Pennober, G., Rakotomanana, F., Cauchemez, S., Metcalf, C. J. E., Herbreteau, V. & Wesolowski, A. (2018). Spatial and temporal dynamics of malaria in Madagascar. Malaria Journal, 17(1), 58. DOI
  26. Ramiadantsoa, T., Sirén, J. & Hanski, I. (2017). Phylogenetic comparative method for geographical radiation. Annales Zoologici Fennici, 54(1-4), 237-257.DOI
  27. Ramiadantsoa, T., Ovaskainen, O., Rybicki, J. & Hanski, I. (2015). Large-scale habitat corridors for biodiversity conservation: A forest corridor in Madagascar. Plos one, 10(7), e0132126. DOI

Submitted and in prep.

  • DeAngelis, D., Blackwood, J., Gaoue, O. G., Howerton, E., Inamine, H., Feldman, O. P., Ramiadantsoa, T., Shea, K., Yeakel, J., Fortin, M‑J. New ecological theory to integrate internal ecological processes and external forces for systems in changing environments. In prep. for Ecology
  • Andrianorosoa, C.T.O., Solofondranohatra, C., Ramiadantsoa, T., …, & Fisher, B. L. Cricket frass fertilizer promotes the survival, growth, and yield of zucchini (Cucurbita pepo). Under review in Plos one
  • Ramiadantsoa, T., Mansoni, A., Rakotovao K. E. P., Rakotoniana, M. M., Rakotonirina, J. C., Smargiassi, S., Palchetti, E., Santini, G., & Fisher, B. L. From grasslands to croplands: impacts of intensive agriculture on ant assemblages in Madagascar. Under review in Biodiversity & Conservation.
  • Rajohnson, S.M., Ramiadantsoa, T., Kelstrup, H., Andriamampionona, M. & Fisher, B.L. Corn bran supplementation improves black soldier fly (Hermetia illucens) rearing on invasive Opuntia stricta. Under review in Journal of Insect as Food & Feed.
  • Ramiadantsoa, T., Nantenaina, R. H., Rakotoniaina, H. J., Rakotonirina, H., Rakouth, H., Ramahandrison, A. T., Ramananjato, V., Randimbiarison, F., Raselimanana, M., Razafimandimby, D. N. & Temba, E. M. Biodiversity decline in Madagascar: the elephant in the room? In prep for Biotropica.
  • Ramiadantsoa, T. & Ives, A. R. Shaky ball vs. shaky cup: relationships between characteristic return and stability in variable environments. In prep for Ecology Letters.

Outreach

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Contact & CV

My CV
Email: tanjona.ramiadantsoa-AT-gmail.com