European native Myriophyllum spicatum showed a higher HCO3-\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\text{HCO}}_{3}^{ - }$$\end{document} use capacity than alien invasive Myriophyllum heterophyllum

Light, temperature, and the availability of carbon are three major drivers of submerged plant growth, photosynthesis, and competitive strength. A laboratory study using a three factorial experimental design (light × temperature × CO2) was carried out to evaluate growth responses (RGR (relative growth rate), LDMC (leaf dry matter content), and root:shoot ratio) and physiological changes (pigment characteristics and net photosynthesis under CO2 depletion) in the European native Myriophyllum spicatum and the non-native invasive M. heterophyllum to changes in the three variables. Both species showed temperature optima of 21°C and highest growth rates under high-light and high CO2 conditions. Additionally, the capacity of both to use HCO3-\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\text{HCO}}_{3}^{ - }$$\end{document} was significantly higher in plants acclimated to CO2 depletion than for plants growing in CO2-rich water. Summarizing, both species showed their ability to grow under variable conditions, but M. spicatum is the better HCO3-\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\text{HCO}}_{3}^{ - }$$\end{document} user and showed better acclimation in growth and physiological parameters to CO2 depletion. Overall, native M. spicatum reached higher growth rates and showed a better acclimation to low CO2 conditions than the non-native M. heterophyllum. Thus, the HCO3-\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\text{HCO}}_{3}^{ - }$$\end{document} use capacity alone cannot explain the success of evergreen M. heterophyllum in formerly M. spicatum-dominated waters.