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Forests
Volume 16
Issue 8
10.3390/f16081236
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Article

The Initial Impact of a Hydroelectric Reservoir on the Floristics, Structure, and Dynamics of Adjacent Forests in the Southern Amazon

by
Jesulino Alves da Rocha-Filho
1,2,
Marco Antônio Camillo de Carvalho
1,
Fabiana Ferreira Cabral Gomes
1,
José Hypolito Piva
3,
Beatriz Schwantes Marimon
4,
Oscar Mitsuo Yamashita
1 and
Ben Hur Marimon-Junior
1,4,*
1
Graduate Program in Biodiversity and Amazonian Agroecosystems, UNEMAT–State University of Mato Grosso, Campus of Alta Floresta, Alta Floresta 78580-000, Mato Grosso, Brazil
2
Graduate Program in Ecology and Conservation, UNEMAT–State University of Mato Grosso, Campus of Nova Xavantina, Nova Xavantina 78690-000, Mato Grosso, Brazil
3
Elo Ambiental, Alta Floresta 78580-000, Mato Grosso, Brazil
4
LABEV–Laboratory of Plant Ecology, UNEMAT–State University of Mato Grosso, Campus of Nova Xavantina, Nova Xavantina 78690-000, Mato Grosso, Brazil
*
Author to whom correspondence should be addressed.
Forests 2025, 16(8), 1236; https://doi.org/10.3390/f16081236 (registering DOI)
Submission received: 27 May 2025 / Revised: 9 July 2025 / Accepted: 23 July 2025 / Published: 27 July 2025
(This article belongs to the Special Issue Tropical Forests, Water Cycle, Global Cycles of Greenhouse Gases and Climate Change)
Versions Notes

Abstract

This study assesses whether the rise in water level—following three years of reservoir filling at the Teles Pires Hydroelectric Plant (135.6 km2 water surface) in Southern Amazonia—has affected the floristic composition, structure, and dynamics of adjacent forests. We established 62 permanent plots (2000 m2 each) across a topographic gradient from the reservoir margin and conducted annual tree inventories for individuals with DBH ≥ 10 cm from 2014 to 2017. A total of 6322 individuals were recorded, representing 322 species, 210 genera, and 61 families. Fabaceae was the most abundant family, and the ten species with the highest importance value index (IVI) before reservoir filling remained dominant afterward. The forests exhibited high species richness and were characterized by a few common and many rare species. Mortality rates were highest within 10 m of elevation from the maximum reservoir level, indicating possible hydrological impacts, although no abnormal dieback or sharp shifts in floristic structure were observed. These results suggest limited short-term effects on species composition, but subtle changes in vegetation dynamics underscore the importance of long-term monitoring.
Keywords: hydroelectric plant; environmental impacts; flood quota; forest dynamics hydroelectric plant; environmental impacts; flood quota; forest dynamics

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MDPI and ACS Style

Rocha-Filho, J.A.d.; Carvalho, M.A.C.d.; Gomes, F.F.C.; Piva, J.H.; Marimon, B.S.; Yamashita, O.M.; Marimon-Junior, B.H. The Initial Impact of a Hydroelectric Reservoir on the Floristics, Structure, and Dynamics of Adjacent Forests in the Southern Amazon. Forests 2025, 16, 1236. https://doi.org/10.3390/f16081236

AMA Style

Rocha-Filho JAd, Carvalho MACd, Gomes FFC, Piva JH, Marimon BS, Yamashita OM, Marimon-Junior BH. The Initial Impact of a Hydroelectric Reservoir on the Floristics, Structure, and Dynamics of Adjacent Forests in the Southern Amazon. Forests. 2025; 16(8):1236. https://doi.org/10.3390/f16081236

Chicago/Turabian Style

Rocha-Filho, Jesulino Alves da, Marco Antônio Camillo de Carvalho, Fabiana Ferreira Cabral Gomes, José Hypolito Piva, Beatriz Schwantes Marimon, Oscar Mitsuo Yamashita, and Ben Hur Marimon-Junior. 2025. "The Initial Impact of a Hydroelectric Reservoir on the Floristics, Structure, and Dynamics of Adjacent Forests in the Southern Amazon" Forests 16, no. 8: 1236. https://doi.org/10.3390/f16081236

APA Style

Rocha-Filho, J. A. d., Carvalho, M. A. C. d., Gomes, F. F. C., Piva, J. H., Marimon, B. S., Yamashita, O. M., & Marimon-Junior, B. H. (2025). The Initial Impact of a Hydroelectric Reservoir on the Floristics, Structure, and Dynamics of Adjacent Forests in the Southern Amazon. Forests, 16(8), 1236. https://doi.org/10.3390/f16081236

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