Flooding afects plant–plant interactions in tree seedlings from fertile Amazonian foodplains, Brazil - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles Hydrobiologia Year : 2022

Flooding afects plant–plant interactions in tree seedlings from fertile Amazonian foodplains, Brazil

Abstract

Several hypotheses try to explain the factors that limit the distribution of tree species in wetlands. Among them, the stress-gradient hypothesis states that interspecifc ecological interactions (facilitation and competition) vary inversely across abiotic stress gradients, with facilitation being more common under conditions of high abiotic stress than under more benign conditions. We investigated the efects of ecological interactions on the biomass of two native tree species, Crateva tapia (highly food-tolerant) and Hura crepitans (low food tolerant) exposed to different experimental fooding conditions in a greenhouse. Individual and paired plants were submitted for 120 days to four treatments: (1) non-fooding and non-ecological interaction; (2) fooding and non-ecological interaction; (3) non-fooding and ecological interaction; (4): fooded and ecological interaction. Flooding reduced biomass allocation in H. crepitans. C. tapia biomass was reduced by interspecifc interaction with H. crepitans. Flood and interspecifc ecological interactions together facilitated the accumulation of biomass in H. crepitans. Our results support the stress-gradient hypothesis, showing that in a fooded environment, the species with low tolerance to fooding (H. crepitans) is favored by the presence of other species. Additional tests with other species can confrm whether this is a pattern that helps explain the establishment of tree species in wetlands.
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Dates and versions

hal-04613981 , version 1 (17-06-2024)

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Naara Ferreira da Silva, Pia Parolin, Maria Teresa Fernandez Piedade, Aline Lopes. Flooding afects plant–plant interactions in tree seedlings from fertile Amazonian foodplains, Brazil. Hydrobiologia, 2022, 850 (6), pp.1303-1317. ⟨10.1007/s10750-022-04985-8⟩. ⟨hal-04613981⟩
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