Does nitrate co-pollution affect biological responses of an aquatic plant to two common herbicides?

Nuttens, Andréïna; Chatellier, S.; Devin, Simon; Guignard, Cédric; Lenouvel, Audrey; Gross, Elisabeth Maria

doi:10.1016/j.aquatox.2016.06.006

Cited by 16 publications

(8 citation statements)

References 63 publications

(85 reference statements)

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“…In the case of leaf and shoot number, V. americana seemed to only show an effect of hypersaline stress 3 weeks after stress induction. These results are in agreement with other studies suggesting a similar effect of salinity on blade length, shoot number and leaf number in this freshwater species ( Bourn, 1932 , 1934 ; Haller et al, 1974 ; Frazer et al, 2006 ). Boustany et al (2010) showed hardly any negative effects on V. americana plants of 3 weeks exposure to 18 PSU but nearly complete mortality after 10 weeks of exposure which also complements other reports including Davis and Brinson (1976) , Staver (1986) , and French and Moore (2003) .…”

Section: Discussionsupporting

confidence: 94%

The Tropical Invasive Seagrass, Halophila stipulacea, Has a Superior Ability to Tolerate Dynamic Changes in Salinity Levels Compared to Its Freshwater Relative, Vallisneria americana

2018

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The tropical seagrass species, Halophila stipulacea, originated from the Indian Ocean and the Red Sea, subsequently invading the Mediterranean and has recently established itself in the Caribbean Sea. Due to its invasive nature, there is growing interest in understanding this species’ capacity to adapt to new conditions. One approach to understanding the natural tolerance of a plant is to compare the tolerant species with a closely related non-tolerant species. We compared the physiological responses of H. stipulacea exposed to different salinities, with that of its nearest freshwater relative, Vallisneria americana. To achieve this goal, H. stipulacea and V. americana plants were grown in dedicated microcosms, and exposed to the following salt regimes: (i) H. stipulacea: control (40 PSU, practical salinity units), hyposalinity (25 PSU) and hypersalinity (60 PSU) for 3 weeks followed by a 4-week recovery phase (back to 40 PSU); (ii) V. americana: control (1 PSU), and hypersalinity (12 PSU) for 3 weeks, followed by a 4-week recovery phase (back to 1 PSU). In H. stipulacea, leaf number and chlorophyll content showed no significant differences between control plants and plants under hypo and hypersalinities, but a significant decrease in leaf area under hypersalinity was observed. In addition, compared with control plants, H. stipulacea plants exposed to hypo and hypersalinity were found to have reduced below-ground biomass and C/N ratios, suggesting changes in the allocation of resources in response to both stresses. There was no significant effect of hypo/hypersalinity on dark-adapted quantum yield of photosystem II (Fv/Fm) suggesting that H. stipulacea photochemistry is resilient to hypo/hypersalinity stress. In contrast to the seagrass, V. americana exposed to hypersalinity displayed significant decreases in above-ground biomass, shoot number, leaf number, blade length and Fv/Fm, followed by significant recoveries of all these parameters upon return of the plants to non-saline control conditions. These data suggest that H. stipulacea shows remarkable tolerance to both hypo and hypersalinity. Resilience to a relatively wide range of salinities may be one of the traits explaining the invasive nature of this species in the Mediterranean and Caribbean Seas.

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Section: Discussionsupporting

confidence: 94%

The Tropical Invasive Seagrass, Halophila stipulacea, Has a Superior Ability to Tolerate Dynamic Changes in Salinity Levels Compared to Its Freshwater Relative, Vallisneria americana

2018

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“…The limited change in dry weight of total shoots compared with changes in length‐related endpoints, and the absence of a concentration–response relationship, showed a limited sensitivity of dry weight of total shoots to the sulfonylurea herbicide in the stream mesocosms. This observation is in line with other studies that reported decreased growth rates of shoot length while no significant effects were shown on the basis of shoot dry weight following exposure to a sulfonylurea herbicide . In the present study, coatings on the macrophyte leaf surfaces were observed, which could not be removed prior to weighing the dried macrophytes.…”

Section: Discussionsupporting

confidence: 92%

Response and recovery of the macrophytes Elodea canadensis and Myriophyllum spicatum following a pulse exposure to the herbicide iofensulfuron‐sodium in outdoor stream mesocosms

Wieczorek

Bakanov

Lagadic

et al. 2016

Enviro Toxic and Chemistry

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Interest in stream mesocosms has recently revived for higher tier aquatic macrophyte risk assessment of plant protection products mainly because 1) the highest predicted environmental concentrations for the assessment of effects are frequently derived from stream scenarios, and 2) they allow an effect assessment using stream-typical pulse exposures. Therefore, the present stream mesocosm study used an herbicide pulse exposure and evaluated the responses of Elodea canadensis and Myriophyllum spicatum. Macrophytes were exposed for 24 h to 1 μg/L, 3 μg/L, 10 μg/L, and 30 μg/L of the herbicide iofensulfuron-sodium with a subsequent recovery period of 42 d. Biological endpoints were growth rates of the main, side, and total shoot length, the shoot number, the maximum root length, and the dry weight. The total shoot length was identified as the most sensitive endpoint; the growth rate of the total shoot length was inhibited by up to 66% and 45% in M. spicatum and E. canadensis, respectively. The lowest no observed effect concentrations (NOECs) were observed at day 7 and/or day 14 after herbicide treatment and were 1 μg/L for M. spicatum and 3 μg/L for E. canadensis. The no-observed-ecologically-adverse-effect concentrations (NOEAECs) were 10 μg/L and 30 μg/L for M. spicatum and E. canadensis, respectively. Such or similar mesocosm designs are useful to simulate typical stream exposures and estimate herbicide effects on aquatic macrophytes in stream systems. Environ Toxicol Chem 2017;36:1090-1100. © 2016 SETAC.

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“…Our results show that effects based on dry mass (RGR-dm) were weaker than those based on fresh mass or total shoot length (RGR-fm; RGR-L). Arsenic is not the only pollutant causing this effect, as the herbicides metsulfuron-methyl (Cedergreen et al 2004) and mesosulfuron-methyl previously showed no effects on dry-mass based growth estimations in M. spicatum, due to increases in DMC as we observed recently (Nuttens et al 2016). From an ecotoxicological perspective, it seems thus prudent to select several growth endpoints to avoid the masking effect of increases in DMC on dry mass related results.…”

Section: Discussionmentioning

confidence: 62%

Sensitive response of sediment-grown Myriophyllum spicatum L. to arsenic pollution under different CO2 availability

et al. 2016

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Aquatic plants may face resource constraints or anthropogenic pollution, and effects might be heightened under multiple stress conditions. We investigated if arsenate effects on Myriophyllum spicatum L. would be stronger under CO2 limitation and low phosphorus availability. In a factorial design, we exposed sediment-grown plants to either CO2 (high carbon or HC) or bicarbonate (low carbon or LC) and four levels of arsenate. We observed strong effects of arsenate exposure on growth, biomass allocation (leaf, stem and root mass fractions), pigments and phenolic compounds. CO2 availability strongly affected the content in phenolic compounds and a few other response variables, yet overall effects were less pronounced than expected. Strong interactive effects of CO2 availability and arsenic concentration were only observed for carotenoids, the carotenoid/chlorophyll ratio and phenolic compounds in leaves. Only the carbon content declined with increasing arsenic concentration, otherwise leaf elemental content and stoichiometry were not affected by arsenic or CO2 availability, suggesting that plants strived to maintain leaf functions. The observed effects on biomass allocation and plant quality, specifically elemental stoichiometry and phenolic compounds content of M. spicatum not only show direct changes in plant performance but suggest also indirect effects on ecological interactions such as competition or herbivory.

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Does nitrate co-pollution affect biological responses of an aquatic plant to two common herbicides?

Cited by 16 publications

References 63 publications

The Tropical Invasive Seagrass, Halophila stipulacea, Has a Superior Ability to Tolerate Dynamic Changes in Salinity Levels Compared to Its Freshwater Relative, Vallisneria americana

The Tropical Invasive Seagrass, Halophila stipulacea, Has a Superior Ability to Tolerate Dynamic Changes in Salinity Levels Compared to Its Freshwater Relative, Vallisneria americana

Response and recovery of the macrophytes Elodea canadensis and Myriophyllum spicatum following a pulse exposure to the herbicide iofensulfuron‐sodium in outdoor stream mesocosms

Sensitive response of sediment-grown Myriophyllum spicatum L. to arsenic pollution under different CO2 availability

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