Article

Fernanda Cristina dos Santos Tiberio, PhD, Professor in the Federal Institute of Education, Science and Technology of São Paulo (Avenue Clara Gianotti de Souza, 5180, 11900-000, Registro, SP, Brazil); iD ORCID: https://orcid.org/0000-0002-0822-6990; e-mail: fernanda.tiberio@ifsp.edu.br
Rafael de Oliveira Xavier, PhD, Post-Doctorate Researcher in the Institute of Biology, State University of Campinas (Rua Monteiro Lobato, 255, 13083-862, Campinas, SP, Brazil); e-mail: filosxavier@yahoo.com.br
Pavel Dodonov, PhD, Professor in the Institute of Biology, Federal University of Bahia (Rua Barão de Jeremoabo, 668 - Campus de Ondina, 40170-115 Salvador, BA, Brazil); iD ORCID: https://orcid.org/0000-0001-8205-6320; e-mail: pdodonov@gmail.com, pdodonov@ufba.br
Dalva M. Silva Matos, PhD, Professor in the Department of Hidrobiology, Federal University of São Carlos (PO Box 676, 13565-905, São Carlos, SP, Brazil); iD ORCID: https://orcid.org/0000-0001-9461-2179; e-mail: dmatos@ufscar.br

Tiberio F.C.S., Xavier R.O., Dodonov P., Silva Matos D.M. 2022. Fire has short-term negative effects on a super-dominant native fern, Pteridium arachnoideum (Dennstaedtiaceae), in a Brazilian savanna. Nature Conservation Research 7(3): 15–25. https://dx.doi.org/10.24189/ncr.2022.027

Electronic Supplement. Summary statistics and original data for a burnt and a control site with Pteridium arachnoideum before and after a prescribed fire in the study area (Central Brazil) (Link).

Although fire occurrence plays a central role in the dominance of the super-dominant bracken fern Pteridium arachnoideum in Neotropical forests, it is unclear whether this applies to the Brazilian savanna (Cerrado), which vegetation is naturally adapted to fire. We assessed fire effects on the aboveground biomass of P. arachnoideum in the Cerrado Ecological Reserve in Central Brazil. We measured frond height, density, standing biomass, and litter biomass before and for two years following a prescribed fire, and also sampled a control site to control for other mortality events and for seasonal variation. The average P. arachnoideum frond height and aboveground biomass decreased over three times in the burnt site 18 months after the fire. The frond density decreased both in the burnt and control site, indicating that this may have been caused in another way than by fire. Conversely, litter biomass decreased shortly after the fire in the burnt site, but returned to pre-fire levels in one year. Possible explanations for the lasting negative effects of fire on the height and biomass of P. arachnoideum include the implementation of the prescribed fire early in the dry season, which likely limited immediate clonal regrowth, and the herbivory by leaf-cutting ants. Nevertheless, the effective clonal growth of P. arachnoideum apparently precluded the fire from having stronger effects and hence this species was not excluded from the site. We conclude that direct and indirect fire effects may cause the decline of P. arachnoideum in Cerrado, so that prescribed fires may be applied as a management strategy in Cerrado sites where this species is super-dominant, ideally in combination with other control measures.

Cerrado, clonal growth, disturbance, Neotropical bracken, prescribed fire

Received: 08.02.2022. Revised: 20.06.2022. Accepted: 25.06.2022.

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