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Invasive Aquatic Plants as Ecosystem Engineers in an Oligo-Mesotrophic Shallow Lake
RIBAUDO, Cristina
Institut Polytechnique de Bordeaux [Bordeaux INP]
Ecosystèmes aquatiques et changements globaux [UR EABX]
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Institut Polytechnique de Bordeaux [Bordeaux INP]
Ecosystèmes aquatiques et changements globaux [UR EABX]
RIBAUDO, Cristina
Institut Polytechnique de Bordeaux [Bordeaux INP]
Ecosystèmes aquatiques et changements globaux [UR EABX]
Institut Polytechnique de Bordeaux [Bordeaux INP]
Ecosystèmes aquatiques et changements globaux [UR EABX]
ABRIL, Gwenaël
Environnements et Paléoenvironnements OCéaniques [EPOC]
Biologie des Organismes et Ecosystèmes Aquatiques [BOREA]
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Environnements et Paléoenvironnements OCéaniques [EPOC]
Biologie des Organismes et Ecosystèmes Aquatiques [BOREA]
Idioma
EN
Article de revue
Este ítem está publicado en
Frontiers in Plant Science. 2018-12-03, vol. 9, n° 1781, p. 14
Resumen en inglés
Exotic hydrophytes are often considered as aquatic weeds, especially when forming dense mats on an originally poorly colonized environment. While management efforts and research are focused on the control and on the impacts ...Leer más >
Exotic hydrophytes are often considered as aquatic weeds, especially when forming dense mats on an originally poorly colonized environment. While management efforts and research are focused on the control and on the impacts of aquatic weeds on biodiversity, their influence on shallow lakes' biogeochemical cycles is still unwell explored. The aim of the present study is to understand whether invasive aquatic plants may affect the biogeochemistry of shallow lakes and act as ecosystem engineers. We performed a multi-year investigation (2013-2015) of dissolved biogeochemical parameters in an oligo-mesotrophic shallow lake of southwest of France (Lacanau Lake), where wind-sheltered bays are colonized by dense mats of exotic Egeria densa Planch. and Lagarosiphon major (Ridl.) Moss. We collected seasonal samples at densely vegetated and plant-free areas, in order to extrapolate and quantify the role of the presence of invasive plants on the biogeochemistry, at the macrophyte stand scale and at the lake scale. Results revealed that elevated plant biomass triggers oxygen (O 2), dissolved inorganic carbon (DIC) and nitrogen (DIN) stratification, with hypoxia events frequently occurring at the bottom of the water column. Within plants bed, elevated respiration rates generated important amounts of carbon dioxide (CO 2), methane (CH 4) and ammonium (NH 4 +). The balance between benthic nutrients regeneration and fixation into biomass results strictly connected to the seasonal lifecycle of the plants. Indeed, during summer, DIC and DIN regenerated from the sediment are quickly fixed into plant biomass and sustain elevated growth rates. On the opposite, in spring and autumn, bacterial and plant respiration overcome nutrients fixation, resulting in an excess of nutrients in the water and in the increase of carbon emission toward the atmosphere. Our study suggests that aquatic weeds may perform as ecosystem engineers, by negatively affecting local oxygenation and by stimulating nutrients regeneration.< Leer menos
Palabras clave en inglés
seasonal
primary production
exotic plants
carbon emission
methane
hypoxia
water stratification
nutrients regeneration
Centros de investigación