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

Teixeira, Mariana Carolina; Bini, Luis Maurício; Thomaz, Sidinei Magela

doi:10.1111/fwb.12849

Cited by 14 publications

(11 citation statements)

References 35 publications

(51 reference statements)

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“…The density of plants in a community also determines competition intensity and the efficiency to exploit available resources and space (Naeem et al 2000;Teixeira et al 2017;Turnbull et al 2010;Wu et al 2017). Denser communities thus should leave less resources and space for potential invaders (Dostál 2011;Dukes 2002;Michelan et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Diversity- and density-mediated allelopathic effects of resident plant communities on invasion by an exotic plant

et al. 2019

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Aims Resident plants can exert allelopathic effects on introduced exotic plants, and resistance to exotic plant invasions usually increases with diversity and density of the resident plant communities. We hypothesize that allelopathic effects increase with increasing diversity and density of the community, and thereby contribute to the community's resistance against invaders. Methods To test these hypotheses, we conducted two greenhouse experiments in which we grew five individuals of the exotic invasive plant Solidago canadensis in pots without residents and in artificially assembled resident plant communities either with two levels of diversity (4 or 8 resident plant species) or two levels of density (8 or 32 individuals, representing 8 species). We used activated carbon as the allelopathy-neutralizer treatment in both the diversity and the density experiment.

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Section: Introductionmentioning

confidence: 99%

Diversity- and density-mediated allelopathic effects of resident plant communities on invasion by an exotic plant

et al. 2019

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“…, Tabassum and Leishman , Teixeira et al. ). The net effect of nutrient availability on species invasions will depend on characteristics of the invasive species (e.g., resource needs, resource use efficiency, trophic position) and the invaded ecosystem (e.g., relative roles of top‐down versus bottom‐up factors in regulating community dynamics; Kolar and Lodge , González et al.…”

Section: Introductionmentioning

confidence: 99%

“…Despite the common co-occurrence of nonnative species and elevated nutrient loading, predicting how these two factors interact to drive ecosystem change remains a key challenge (Flores-Moreno et al 2016, Tabassum and Leishman 2016, Teixeira et al 2017. The net effect of nutrient availability on species invasions will depend on characteristics of the invasive species (e.g., resource needs, resource use efficiency, trophic position) and the invaded ecosystem (e.g., relative roles of top-down versus bottom-up factors in regulating community dynamics; Kolar andLodge 2000, Gonz alez et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Nutrient availability and invasive fish jointly drive community dynamics in an experimental aquatic system

2018

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Species invasions increasingly occur alongside other forms of ecosystem change, highlighting the need to understand how invasion outcomes are influenced by environmental factors. Within freshwaters, two of the most widespread drivers of change are introduced fishes and nutrient loading, yet it remains difficult to predict how interactions between these drivers affect invasion success and consequences for native communities. To test competing theories about interactions between nutrients and invasions, we conducted a 2 × 3 factorial mesocosm experiment, varying western mosquitofish (Gambusia affinis) presence and nutrient availability within aquatic communities. Based on theory, increased nutrients could either (1) facilitate coexistence between predatory mosquitofish and native species by increasing prey availability (the invader attenuation hypothesis) or (2) strengthen predation effects by enhancing fish productivity more than native community members (the invader amplification hypothesis). In outdoor mesocosms designed to mimic observed nutrient conditions and local community structure, mosquitofish directly reduced the abundances of zooplankton and three native amphibian species, leading to indirect increases in phytoplankton, periphyton, and freshwater snail biomass through trophic cascades. Nutrient additions increased native amphibian growth but had especially pronounced effects on the productivity of invasive mosquitofish. The elevated nutrient condition supported ~5 times more juvenile mosquitofish and 30% higher biomass than the low nutrient condition. Increased nutrients levels did not weaken the top‐down effects of mosquitofish on invertebrates or amphibians. Collectively, our results support the invader amplification hypothesis, suggesting that increased nutrient loading may benefit invasive species without attenuating their undesirable effects on native community members.

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“…Similarly, as in the first scenario, the species were left to grow for an additional 30 days after adding shading. We determined that the interval of 30 days between the planting of the native propagules and the addition of the propagules of the invasive species was sufficient because previous investigations conducted in the field with P. pernambucense (Milne, Murphy & Thomaz ) and in mesocosms with L. hexandra (Teixeira, Bini & Thomaz, in press) showed that these two species reach maturity between 45 and 50 days. This fast growth was confirmed in our experiment because the height and biomass were 73·8 cm (±16·24 SD) and 1·85 g DW (±16·24 SD), respectively, for P. pernambucense and 50·6 cm (±15·95 SD) and 1·54 g DW (±0·17 SD), respectively, for L. hexandra , after 30 days.…”

Section: Methodsmentioning

confidence: 99%

Shade provided by riparian plants and biotic resistance by macrophytes reduce the establishment of an invasive Poaceae

et al. 2016

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Running title:Riparian plants and invasion resistance Summary 1. Riparian corridors are habitats that are prone to invasion by non-native plants, but the shade provided by trees that grow in riparian zones may limit the success of invasive species. Accepted ArticleThis article is protected by copyright. All rights reserved. 2. In this investigation, we conducted three complementary experiments to test the effects of shade levels, along with sediment type and biotic resistance (and their interactions), on the establishment of a highly invasive grass (Urochloa arrecta (Hack. ex T. Durand & Schinz) Morrone & Zuloaga).3. This invasive grass presented higher growth rates in sediment collected under riparian vegetation than in sediment collected at sites devoid of vegetation. Shade levels similar to those found underneath riparian vegetation suppressed the establishment of U. arrecta. In addition, when native macrophytes were planted a priori (i.e. before U. arrecta propagules arrived), the establishment of the invasive species was suppressed, even at lower levels of shade. Thus, biotic resistance was sufficient to prevent the establishment of the invasive grass at low shade levels. Therefore, our results indicated that although the sediment from riparian zones may favour the establishment of U. arrecta, shading by trees and the presence of native macrophytes suppress it. Synthesis and applications.Our results indicate that the shade provided by riparian trees and biotic resistance by macrophytes are likely the factors that negatively affect the establishment of the invasive macrophyte U. arrecta. A recommendation for management arising from our results is that restoring riparian corridors to prevent invasion is most likely more efficient if native macrophytes are planted along with the trees. This would be an efficient strategy to prevent invasion by U. arrecta and other invasive Poaceae during the early stages of riparian vegetation regeneration.

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

Cited by 14 publications

References 35 publications

Diversity- and density-mediated allelopathic effects of resident plant communities on invasion by an exotic plant

Diversity- and density-mediated allelopathic effects of resident plant communities on invasion by an exotic plant

Nutrient availability and invasive fish jointly drive community dynamics in an experimental aquatic system

Shade provided by riparian plants and biotic resistance by macrophytes reduce the establishment of an invasive Poaceae

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