Invasive knotweed has greater nitrogen-use efficiency than native plants: evidence from a N-15 pulse-chasing experiment

Parepa, Madalin and Kahmen, Ansgar and Werner, Roland A. and Fischer, Markus and Bossdorf, Oliver. (2019) Invasive knotweed has greater nitrogen-use efficiency than native plants: evidence from a N-15 pulse-chasing experiment. OECOLOGIA, 191 (2). pp. 389-396.

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Official URL: https://edoc.unibas.ch/73513/

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Habitats with fluctuating resource conditions pose specific challenges to plants, and they often favor a small subset of species that includes exotic invaders. These species must possess a superior ability to capitalize on resource pulses through faster resource uptake or greater resource-use efficiency. We addressed this question in an experiment with invasive knotweed, a noxious invader of temperate ecosystems that is known to benefit from nutrient fluctuations. We used stable isotopes to track the uptake and use efficiency of a nitrogen pulse in competition pairs between knotweed and five native competitors. We found that nitrogen pulses indeed promoted knotweed invasion and that this is explained by a superior efficiency in turning the taken-up extra nitrogen into biomass, rather than capturing an overproportional share of the nitrogen. Thus, temporary increases in nutrient availability might help knotweed to invade natural environments, such as river banks or nitrogen-polluted margins and wastelands, where nutrient fluctuations occur. Our experiment shows that resource-use efficiency can drive invasion under fluctuating resource conditions, and that stable isotopes help to understand these processes.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Integrative Biologie > Physiological Plant Ecology (Kahmen)
UniBasel Contributors:Kahmen, Ansgar
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:24 Aug 2020 13:48
Deposited On:24 Aug 2020 13:48

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