Sediment composition mediates the invasibility of aquatic ecosystems by a non-native Poaceae species

Fasoli, José Vitor Botter; Michelan, Thaísa Sala; Thomaz, Sidinei Magela

doi:10.1590/s2179-975x5214

Cited by 7 publications

(3 citation statements)

References 19 publications

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“…Third, experiments using gradients of native biomass also showed that BR impacts U. arrecta, even at low densities of native species (Michelan, Thomaz & Bini, ). Fourth, this invasive species is known to be favoured by nutrient enrichment when grown in monocultures (Fasoli, Michelan & Thomaz, ). Taken together, these four lines of evidence give us confidence in the robustness of our overall findings.…”

Section: Discussionmentioning

confidence: 99%

Biotic resistance buffers the effects of nutrient enrichment on the success of a highly invasive aquatic plant

2016

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Summary Biotic resistance theory predicts that the presence of a species‐rich native community is able to inhibit the establishment of invasive species. On the other hand, disturbed environments, for example, through eutrophication, tend to be more easily invaded. We investigated the effect of biotic resistance on the establishment success of the aquatic grass Urochloa arrecta in nutrient‐enriched and non‐enriched mesocosms so as to test the hypothesis that the effects of biotic resistance on invader success depend on ecosystem trophic state. Invader success, measured as plant biomass and length, increased with nutrient enrichment in treatments without biotic resistance, whereas there was no difference between the success of the invader in enriched or non‐enriched mesocosms in the presence of biotic resistance. Our results suggest that eutrophication enhanced the resistance offered by the native community and thereby reduced the establishment of invaders. The results underscore the importance of native communities as biotic filters to invasion, especially in environments that are subjected to anthropogenic impacts such as nutrient enrichment.

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Section: Discussionmentioning

confidence: 99%

Biotic resistance buffers the effects of nutrient enrichment on the success of a highly invasive aquatic plant

2016

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“…In particular, this species is invading and causing ecological impacts in various Brazilian aquatic ecosystems ( Pott et al, 2011 ; Fernandes et al, 2013 ; Amorim et al, 2015 ). U. arrecta forms large patches, accumulates large amounts of biomass in littoral zones ( Michelan et al, 2010b ; Fernandes et al, 2013 ; Amorim et al, 2015 ), regenerates rapidly after disturbances ( Michelan et al, 2010a ) and can thrive even in relatively oligotrophic environments with nutrient-poor sandy substrates ( Fasoli et al, 2015 ). However, there is a paucity of experimental studies evaluating the competitive effects of U. arrecta on individual macrophyte species.…”

Section: Introductionmentioning

confidence: 99%

Competitive Effects Hinder the Recolonization of Native Species in Environments Densely Occupied by One Invasive Exotic Species

et al. 2018

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The responses of native plants to competition with invasive plants depend mainly on the density of the invasive plants and on the ability of the native plants to compete for resources. In this study, we tested the influence of the invasive exotic Urochloa arrecta (Poaceae) on the early colonization of two native species (Pontederia cordata and Leersia hexandra) of aquatic macrophytes. Our hypotheses were (i) the competitive effects of U. arrecta on the native species P. cordata and L. hexandra are density-dependent and that (ii) these species respond differently to competitive interactions with the invasive species. We conducted the experiments in a greenhouse and in the field, in a tropical reservoir. The biomass of U. arrecta (ranging from 206.2 to 447.1 g) was manipulated in the greenhouse in trays with different densities. After the establishment of the invasive species, we added P. cordata and L. hexandra propagules to each tray. In the field, a propagule of P. cordata was planted in 36 sites with different densities of U. arrecta. The biomass and length of the natives and the biomass of the invasive species were measured in the greenhouse and in the field experiments. The biomass and length of the native plants decreased with increasing biomass of the exotic species in both experiments, showing that the competition between U. arrecta and native species depends on the density of the exotic species. The root:shoot ratio of L. hexandra decreased with increasing U. arrecta biomass, but the opposite occurred for P. cordata. These results indicate that native species exhibit different strategies of biomass allocation when interacting with U. arrecta. The strong competitive effects of U. arrecta and the different responses of the native species help to explain the reduced diversity of native macrophytes observed in sites colonized by U. arrecta. The results also suggest that in a scenario of dominance of exotic species, recolonization by native macrophytes is unlike to occur naturally and without human interventions that reduce the biomass of the exotic species.

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“…For example, showed that brownification may enhance the success of invasive submerged macrophytes in temperate regions. Abiotic filters related to sediment characteristics (e.g., organic matter) also explain the successful invasion of U. arrecta (Fasoli et al 2015) and H. verticillata in Brazilian ecosystems (Silveira & Thomaz 2015, Silveira et al 2016, Pulzatto et al 2019. Wave disturbance was also found to be an important factor in preventing colonization of U. arrecta in reservoirs .…”

Section: Invasion Biologymentioning

confidence: 99%

Ecology of Aquatic Macrophytes in Brazil: The Legacy of Francisco De Assis Esteves

Thomaz¹,

Carvalho²,

Mormul³

et al. 2022

Oecol. Austr.

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In this review, we evaluate the contribution of Brazilian limnologists to research outputs on aquatic macrophyte ecology. We found a strong “adviser effect” of Professor F.A. Esteves on the Brazilian scientific production focused on aquatic macrophytes. In general, articles focused on a variety of themes, including, inter alia, the role of aquatic macrophytes on the biodiversity of other groups, the interaction between macrophytes and the environment, the effects of environmental factors on aquatic macrophytes distribution and biodiversity, the effects of invasive species on aquatic biodiversity, aquatic macrophytes control and decomposition. Emerging topics (e.g., metacommunity ecology, biodiversity-ecosystem functioning, and patterns of diversity and their determinants) are being embraced by Brazilian limnologists that use aquatic macrophytes as organism models. Despite the fact there is much to study, we think that directly (e.g., via mentoring) or indirectly (via publications), our current knowledge about macrophytes ecology was inspired by Chico Esteves.

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Sediment composition mediates the invasibility of aquatic ecosystems by a non-native Poaceae species

Cited by 7 publications

References 19 publications

Biotic resistance buffers the effects of nutrient enrichment on the success of a highly invasive aquatic plant

Biotic resistance buffers the effects of nutrient enrichment on the success of a highly invasive aquatic plant

Competitive Effects Hinder the Recolonization of Native Species in Environments Densely Occupied by One Invasive Exotic Species

Ecology of Aquatic Macrophytes in Brazil: The Legacy of Francisco De Assis Esteves

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