Effects of light reduction on growth of the submerged macrophyte Vallisneria americana and the community of root-associated heterotrophic bacteria

Kurtz, Janis C.; Yates, Diane F.; Macauley, John M.; Quarles, Robert L.; Genthner, Fred J.; Chancy, Cynthia A.; Devereux, Richard

doi:10.1016/s0022-0981(03)00120-5

Cited by 39 publications

(19 citation statements)

References 81 publications

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“…These shades are often used to observe the response of seagrasses in terms of growth and physiology (Philippart, 1995;Lee and Dunton, 1997;Longstaff and Dennison, 1999;Kraemer and Hanisak, 2000;Ruiz and Romero, 2001b;Peralta et al, 2002). In addition, seagrass populations have recently been examined with regard to interactions with herbivores, epiphytes and/or bacterial communities (Burkholder et al, 1992;Moore and Wetzel, 2000;Ibarra-Obando et al, 2004;Kurtz et al, 2003). The effects of nutrients mostly have been studied by means of artificial enrichment.…”

Section: Introductionmentioning

confidence: 99%

Effects of experimental reduction of light and nutrient enrichments (N and P) on seagrasses: a review

Leoni

Vela

Pasqualini

et al. 2007

Aquatic Conservation

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ABSTRACT1. Excessive nutrient discharge, linked to human activities, is one of the main causes of the decline of seagrass meadows since it modifies two essential parameters controlling their primary production: the nutrient concentrations (especially nitrogen and phosphorus) and the irradiance.2. To investigate the behaviour of seagrass under varied conditions of light and/or nutrient concentrations, it is necessary to experimentally manipulate nutrient enrichment and light, either in situ or in artificial ecosystems. The available experimental information concerning the influences of light reduction and nutrient enrichments (N and P) on seagrass meadows are summarized.3. The protocols for experimentally reducing light vary considerably but all light reduction experiments show a decrease in seagrass vitality and physiological changes (e.g. promotes an increase in chlorophyll and tissue nitrogen), depending on the species-specific tolerance (light optima).4. A wide range of protocols for experimentally increasing nutrient levels have been applied, including varying the nutrient species quantities and ratios, as well as the sources and frequency of additions. Responses to N and/or P enrichment range from stimulation to direct or indirect inhibition, varying depending upon the species, the protocol implemented, the nutrient source (water column versus sediments), and other environmental conditions (e.g. interactions with factors such as temperature, grazing and light).5. Both light reduction and nutrient enrichment, can cause seagrass decline, through similar internal mechanisms, promoting an imbalance of internal nutrient supply ratios. Similar physiological responses can thus be observed (e.g. increase of N, P and chlorophyll contents of leaves).6. This study shows the close link between the physiology and morphology of seagrasses, with regard to environmental modifications. It also highlights their ability to provide information on environmental conditions by means of their responses.

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Section: Introductionmentioning

confidence: 99%

Effects of experimental reduction of light and nutrient enrichments (N and P) on seagrasses: a review

Leoni

Vela

Pasqualini

et al. 2007

Aquatic Conservation

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“…However, V. americana has a competitive advantage over other aquatic angiosperms in conditions of limited growth caused by the availability of light, as its rate of photosynthesis is more efficient and it rapidly acclimatises to light variations (Barko et al, 1982;Catling et al, 1994;Harley & Findlay, 1994). Under experimental conditions of low light intensity, V. americana responds with a decrease in the below and above sediment biomass and in the length and width of the leaves (Kurtz et al, 2003). However, light in wetlands is irregular in intensity, and rooted macrophytes recuperate by the translocation of resources through interconnected rametes, that allows nutrient and metabolic products to move among the patches that receive light (Catling et al, 1994).…”

Section: Discussionmentioning

confidence: 99%

Macrofaunistic Diversity in Vallisneria americana Michx. in a Tropical Wetland, Southern Gulf of Mexico

Sánchez¹,

Florido²,

Salcedo³

et al. 2012

Diversity of Ecosystems

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“…Time for atrazine removal also decreased from 40 days to 7 days after successive incubations, suggesting that microorganisms progressively colonized the root system. Extraction of metals by plants is almost improved by rhizospheric microorganisms, thanks to various metabolites such as siderophores, organic acids and biosurfactants that enhance the amount of metals at the plant's disposal and macrophytes are also concerned as shown with Vallisneria americana and the community of root-associated heterotrophic bacteria (Kurtz et al, 2003).…”

Section: Microorganisms As Pillars Of Biological Treatmentsmentioning

confidence: 99%

Mitigation of Agricultural Nonpoint-Source Pesticide Pollution in Artificial Wetland Ecosystems – A Review

Grégoire

Elsaesser

Huguenot

et al. 2009

Climate Change, Intercropping, Pest Control and Beneficial Microorganisms

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Contamination caused by pesticides in agriculture is a source of poor environmental water quality in some of the European Union countries. Without treatment or targeted mitigation, this pollution is diffused in the environment. Pesticides and their metabolites are of increasing concern because of their potential impacts on the environment, wildlife and human health. Within the context of the European Union (EU) Water Framework Directive and to promote low-pesticide-input farming and best management practices, the EU LIFE project ArtWET assessed the efficiency of ecological bioengineering methods using different artificial wetland (AW) prototypes throughout Europe. We optimized physical and biological processes to mitigate agricultural nonpoint-source pesticide pollution in AW ecosystems. Mitigation solutions were implemented at full-scale demonstration and experimental sites. We tested various bioremediation methods at seven experimental sites. These sites involved (1) experimental prototypes, such as vegetated ditches, a forest microcosm and 12 wetland mesocosms, and (2) demonstration prototypes, such as vegetated ditches, three detention ponds enhanced with technology of constructed wetlands, an outdoor bioreactor and a biomassbed. This set-up provides a variety of hydrologic conditions, with some systems permanently flooded and others temporarily flooded. It also allowed to study processes both in field and controlled conditions. In order to compare the efficiency of the wetlands, mass balances at the inlet and outlet of the AW will be used, taking into account the partitioning of the studied compound in water, sediments, plants and suspended solids. The literature background necessary to harmonize the interdisciplinary work is reviewed here and the theoretical framework regarding pesticide removal mechanisms in AWs is discussed. The development and the implementation of innovative approaches concerning various water quality sampling strategies for pesticide load estimates during flood, specific biological endpoints, innovative bioprocesses applied to herbicide and copper mitigation to enhance the pesticide retention time within the AW, modelling the transport and the fate of pesticides using a 2D mixed hybrid finite element model are introduced. These future results will be useful to optimize hydraulic functioning, e.g. pesticide resident time, and biogeochemical conditions, e.g. dissipation, inside the AWs. Hydraulic retention times are generally too low to allow an optimized adsorption on sediment and organic materials accumulated in AWs. Absorption by plants is also not effective (VanBeinum et al., 2006). The control of the hydraulic design and the use of adsorbing materials can be useful to increase the pesticide's residence time and the contact between pesticides and biocatalyzers. Pesticide fluxes can be reduced by 50-80% when hydraulic pathways in AWs are optimized by increasing ten times the retention time, by recirculation of water, and by deceleration of the flow. Thus, using a bioremediat...

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Effects of light reduction on growth of the submerged macrophyte Vallisneria americana and the community of root-associated heterotrophic bacteria

Cited by 39 publications

References 81 publications

Effects of experimental reduction of light and nutrient enrichments (N and P) on seagrasses: a review

Effects of experimental reduction of light and nutrient enrichments (N and P) on seagrasses: a review

Macrofaunistic Diversity in Vallisneria americana Michx. in a Tropical Wetland, Southern Gulf of Mexico

Mitigation of Agricultural Nonpoint-Source Pesticide Pollution in Artificial Wetland Ecosystems – A Review

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