Which adaptations of some invasive Ludwigia spp. (Rosidae, Onagraceae) populations occur in contrasting hydrological conditions in Western France?

Haury, Jacques; Druel, Arsène; Cabral, Teipotemarama; Paulet, Yann; Bozec, Michel M.; Coudreuse, Julie

doi:10.1007/s10750-014-1815-7

Cited by 18 publications

(28 citation statements)

References 20 publications

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“…We suggest that this distinction may be partially supported by an increased root network in Tm, especially in the terrestrial condition, as it has been described under natural conditions by Haury et al. (). In addition, if the capacity for CO 2 uptake is required for achieving a higher relative growth of the Tm, this morphological change is not sufficient for supporting its higher growth rate, which also involves a higher efficiency in acquiring and assimilating available nutrients.…”

Section: Discussionsupporting

confidence: 75%

“…Haury et al. () also observed that the biomasses of field‐collected L. grandiflora from meadows were characterized by twofold increase than in dykes and the percentage of roots was slightly higher in plants from meadows than in those from dykes.…”

Section: Discussionmentioning

confidence: 92%

“…The terrestrial morphotype is characterized by a bushy morphology, with shorter internodes and stems, as well as more secondary ramifications. Conversely, in aquatic habitats, the plant architecture is simpler (Haury et al., ) and is most probably driven by the limited gas exchanges of water submerged leaves as O 2 and CO 2 have 10,000‐fold lower diffusion coefficients in water compared to air (Voesenek, Colmer, Pierik, Millenaar, & Peeters, ). For completely submerged plants, like macrophytes, direct access to atmospheric O 2 is excluded and may cause anoxic or hypoxic conditions.…”

Section: Introductionmentioning

confidence: 99%

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Aquatic and terrestrial morphotypes of the aquatic invasive plant, Ludwigia grandiflora, show distinct morphological and metabolomic responses

Billet

Genitoni

Bozec

et al. 2018

Ecology and Evolution

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In the context of expansion of invasive species, survival of invasive plants is conditioned by their ability to adapt. In France, the water primrose Ludwigia grandiflora, an aquatic invasive species, invades yet wet meadows, leading to a depreciation of their fodder value. Understanding its potential adaption is necessary to its management, strong differences between both morphotypes were expected. So morphological and metabolic responses to terrestrial environment were analyzed for aquatic and terrestrial morphotypes. All morphological and biomass variables were greater in the terrestrial morphotype than the aquatic morphotype, independent of conditions. In terrestrial condition, both morphotypes showed a high production of sugars in root tissues, especially in the terrestrial morphotype and both morphotypes produced a low level of amino acids in shoot tissues. All results demonstrate that the terrestrial condition seems a stressful situation for both morphotypes, which activates glycolysis and fermentation pathways to improve their survival under hypoxic stress. But, only the terrestrial morphotype has been able to adjust its metabolism and maintain efficient growth. In the future, a differential transcriptomic analysis will be carried out to confirm this result.

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Section: Discussionsupporting

confidence: 75%

Section: Discussionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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Aquatic and terrestrial morphotypes of the aquatic invasive plant, Ludwigia grandiflora, show distinct morphological and metabolomic responses

Billet

Genitoni

Bozec

et al. 2018

Ecology and Evolution

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“…hexapetala) is a South American species widely spread in western Europe and in the USA (Thouvenot, Haury, & Thiebaut, 2013). Recent studies in France have shown increasing numbers of L. hexapetala fertile populations over the past 15 years Haury et al, 2014;Ruaux, Greulich, Haury, & Berton, 2009), raising concerns about their invasiveness. The level of environmental damage caused by the presence of dense stands of L. hexapetala is considerable: alteration of water flow, increase in sedimentation and accumulation of organic matter, induction of anoxic water conditions, an impairment of native plant, macroinvertebrate and fish populations (Dandelot, Matheron, Le Petit, Verlaque, & Cazaubon, 2005;Stiers, Crohain, Josens, & Triest, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…The level of environmental damage caused by the presence of dense stands of L. hexapetala is considerable: alteration of water flow, increase in sedimentation and accumulation of organic matter, induction of anoxic water conditions, an impairment of native plant, macroinvertebrate and fish populations (Dandelot, Matheron, Le Petit, Verlaque, & Cazaubon, 2005;Stiers, Crohain, Josens, & Triest, 2011). In this case, stimulation of its own seed germination or, conversely, inhibition of L. hexapetala seed germination by the native species mediated by allelochemicals could potentially exert a strong control on the persistence of L. hexapetala populations after disturbances such as managed control efforts (Haury et al, 2014). Fruits of L. hexapetala float in water and are easily dispersed by water currents, as are the clonal (vegetative) propagules (Thouvenot et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Seasonal dependence and functional implications of macrophyte–phytoplankton allelopathic interactions

2018

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Invasive plant species such as Ludwigia hexapetala might have a competitive advantage if they produce allelopathically active compounds against primary producers. Both phytoplankton and plant community structure may be affected due to different, species‐specific sensitivity to allelochemicals. Moreover, such allelopathic interactions could vary over the year depending on (i) the plant's phenological stage and (ii) the abilities of the native macrophytes to suppress—or the non‐native macrophytes to stimulate—the non‐native macrophyte population. We tested the allelopathic effects of aqueous leaf extracts of L. hexapetala on the photosynthetic activity of three target phytoplankton strains (Scenedesmus communis, a toxic Microcystis aeruginosa strain and a non‐toxic Microcystis aeruginosa strain) over three seasons of development (spring, summer and autumn). We also tested seasonal allelopathic effects of aqueous leaf extracts of both L. hexapetala (i.e. the non‐native invasive species) and the native Mentha aquatica on L. hexapetala seed germination. Finally, we identified three main secondary compounds present in the aqueous leaf extracts of L. hexapetala and we tested each individual compound on the phytoplankton's photosynthetic activity and on L. hexapetala seed germination. We observed marked seasonal and species‐specific patterns of L. hexapetala allelopathy on phytoplankton. The photosynthetic activities of S. communis and the toxic M. aeruginosa strain were stimulated by L. hexapetala aqueous leaf extracts in autumn and spring, respectively, whereas the non‐toxic M. aeruginosa strain was strongly inhibited in these two seasons. In summer, photosynthesis of all phytoplankton strains was inhibited. The germination rate of L. hexapetala seeds was stimulated by both L. hexapetala and M. aquatica aqueous leaf extracts, especially in summer, concomitant with the strong negative effects observed on the three phytoplankton strains. Three flavonoid glycosides (myricitrin, prunin and quercitrin) were identified as the main secondary compounds present in the L. hexapetala aqueous leaf extracts. The photosynthetic activity of S. communis was slightly stimulated by the three compounds. The photosynthetic activity of the toxic M. aeruginosa strain was stimulated by myricitrin and quercitrin, whereas that of the non‐toxic M. aeruginosa strain was inhibited by prunin. Finally, the germination rate and the germination velocity of L. hexapetala seeds were stimulated by myricitrin and prunin. These findings suggest that L. hexapetala could favour the photosynthetic activity of toxic cyanobacteria in spring and reduce their photosynthetic activity in summer, potentially leading to drastic changes in the phytoplankton communities and therewith ecological functioning of invaded ponds. Moreover, the stimulation of its seed germination could give a strong competitive advantage to L. hexapetala, thus promoting its invasiveness.

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Seed source regions drive fitness differences in invasive macrophytes

Gillard

Drenovsky

Thiébaut

et al. 2020

American J of Botany

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Premise Worldwide, ecosystems are threatened by global changes, including biological invasions. Invasive species arriving in novel environments experience new climatic conditions that can affect their successful establishment. Determining the response of functional traits and fitness components of invasive populations from contrasting environments can provide a useful framework to assess species responses to climate change and the variability of these responses among source populations. Much research on macrophytes has focused on establishment from clonal fragments; however, colonization from sexual propagules has rarely been studied. Our objective was to compare trait responses of plants generated from sexual propagules sourced from three climatic regions but grown under common environmental conditions, using L. peploides subsp. montevidensis as a model taxon. Methods We grew seedlings to reproductive stage in experimental mesocosms under a mediterranean California (MCA) climate from seeds collected in oceanic France (OFR), mediterranean France (MFR), and MCA. Results Seed source region was a major factor influencing differences among invasive plants recruiting from sexual propagules of L. peploides subsp. montevidensis. Trait responses of young individual recruits from MCA and OFR, sourced from geographically distant and climatically distinct source regions, were the most different. The MCA individuals accumulated more biomass, flowered earlier, and had higher leaf N concentrations than the OFR plants. Those from MFR had intermediate profiles. Conclusions By showing that the closer a seedling is from its parental climate, the better it performs, this study provides new insights to the understanding of colonization of invasive plant species and informs its management under novel and changing environmental conditions.

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Which adaptations of some invasive Ludwigia spp. (Rosidae, Onagraceae) populations occur in contrasting hydrological conditions in Western France?

Cited by 18 publications

References 20 publications

Aquatic and terrestrial morphotypes of the aquatic invasive plant, Ludwigia grandiflora, show distinct morphological and metabolomic responses

Aquatic and terrestrial morphotypes of the aquatic invasive plant, Ludwigia grandiflora, show distinct morphological and metabolomic responses

Seasonal dependence and functional implications of macrophyte–phytoplankton allelopathic interactions

Seed source regions drive fitness differences in invasive macrophytes

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