Tissue Hydrogen Peroxide Concentration Can Explain the Invasiveness of Aquatic Macrophytes: A Modeling Perspective

In recent years, an invasive macrophyte, Egeria densa , has overwhelmingly colonized some midstream reaches of Japanese rivers. This study was designed to determine how E. been able colonize these areas and assess the environmental conditions that limit or even prevent colonization. Invasive species ( Elodea nuttallii ), native Myriophyllum spicatum Ceratophyllum demersum Potamogeton crispuss ) were kept in experimental tanks a flume with different conditions. Tissue hydrogen peroxide (H 2 O concentrations measured responding either individual multiple factors light intensity, water temperature, flow velocity. addition, plants sampled rivers across Japan, measured. The H concentration increased parallel increment unpreferable levels each abiotic factor, trend independent other factors. total is provided by sum contribution factor. Under concentration, first started decrease chlorophyll then reduce their growth rate, subsequently biomass. threshold, beyond which degradation initiated, between 15 20 µmol/gFW regardless These results highlight potential efficacy as proxy for overall condition. rivers, major limiting macrophyte colonization identified high solar radiation, relationship empirically obtained species. Then mathematical model developed predict area tissue decreases increasing temperature increases species, including Therefore, grow intensively spring; however, they often deteriorate summer. For on hand, summer, allowing intensive growth. High radiation deteriorating plant. Although low winter, it can survive deep due diffused radiation. Currently, river rehabilitation created zone channel, supports spreading .