Research
We pioneer practical methods for restoring forests on degraded tropical lands and collaborate with universities in the US, Central and South America, and Europe to host innovative and long-term research.

Publications
Joyce, F. H., R. A. Zahawi, and K. D. Holl. (2025) Lower-intensity restoration interventions drive greater seedling establishment for later-successional tree species. Journal of Applied Ecology https://doi.org/10.1111/1365-2664.70116
Werden, L. K., Cole, R. J., Schönhofer, K., Holl, K. D., Zahawi, R. A., Averill, C., Schweizer, D., Calvo-Alvarado, J. C., Hamilton, D., Joyce, F. H., San-José, M., Hofhansl, F., Briggs, L., Rodríguez, D., Tingle, J. W., Chiriboga, F., Broadbent, E. N., Quirós-Cedeño, G. J., & Crowther, T. W. (2024). Assessing innovations for upscaling forest landscape restoration. One Earth, 7(9), 1515-1525. https://doi.org/10.1016/j.oneear.2024.07.011
Holl KD, Reid JL, Zahawi RA, De Siqueira LP, Brancalion PHS (2024) A call for practical spatially patterned forest restoration methods. Restoration Ecology 32:e14266 https://doi.org/10.1111/rec.14266
Schweizer, D., Cole, R.J., Werden, L.K., Cedeño, G.Q., Rodriguez, D., Navarro, K., Esquivel, J.M., Max, S., Chiriboga, F.E., Zahawi, R.A., Holl, K.D. and Crowther, T.W. (2024), Review and assessment of smartphone apps for forest restoration monitoring. Restor Ecol, 32: e14136. https://doi.org/10.1111/rec.14136
Kulikowski Andy J., Zahawi Rakan A., Werden Leland K., Zhu Kai and Holl Karen D. (2023) Restoration interventions mediate tropical tree recruitment dynamics over timePhil. Trans. R. Soc. B37820210077http://doi.org/10.1098/rstb.2021.0077
Coffee pulp accelerates early tropical forest succession on old fields. RJ Cole, RA Zahawi - Ecological Solutions and Evidence, 2021
Assisted restoration interventions drive functional recovery of tropical wet forest tree communities. LK Werden, S Zarges, KD Holl, CL Oliver… - Frontiers in Forests and Global Change, 2022.
The landscape genetic signature of pollination by trapliners: evidence from the tropical herb, Heliconia tortuosa. F Torres-Vanegas, AS Hadley, UG Kormann, FA Jones… - Frontiers in Genetics, 2019
Applied nucleation facilitates tropical forest recovery: Lessons learned from a 15‐year study. KD Holl, JL Reid, RJ Cole, F Oviedo‐Brenes… - Journal of Applied Ecology, 2020
Ant–scale mutualism increases scale infestation, decreases folivory, and disrupts biological control in restored tropical forests. AJ Kulikowski - Biotropica, 2020
Leaf litter arthropod responses to tropical forest restoration. RJ Cole, KD Holl, RA Zahawi, P Wickey, AR Townsend - Ecology and Evolution, 2016
Seed dispersal limitations shift over time in tropical forest restoration. JL Reid, KD Holl, RA Zahawi - Ecological Applications, 2015
Testing applied nucleation as a strategy to facilitate tropical forest recovery. RA Zahawi, KD Holl, RJ Cole, JL Reid - Journal of Applied Ecology, 2013
Seed rain under tree islands planted to restore degraded lands in a tropical agricultural landscape. RJ Cole, KD Holl, RA Zahawi - Ecological Applications, 2010
Direct seeding of late-successional trees to restore tropical montane forest. RJ Cole, KD Holl, CL Keene, RA Zahawi - Forest Ecology and Management, 2011
