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

Parepa, Madalin; Kahmen, Ansgar; Werner, Roland A.; Fischer, Markus; Bossdorf, Oliver (2019). Invasive knotweed has greater nitrogen-use efficiency than native plants: evidence from a 15N pulse-chasing experiment. Oecologia, 191(2), pp. 389-396. Springer 10.1007/s00442-019-04490-1

[img] Text
2019_Oecologia2.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (716kB) | Request a copy

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.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Plant Ecology
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)

UniBE Contributor:

Parepa, Madalin; Fischer, Markus and Bossdorf, Oliver

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

0029-8549

Publisher:

Springer

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

30 Aug 2019 16:40

Last Modified:

23 Oct 2019 23:37

Publisher DOI:

10.1007/s00442-019-04490-1

Related URLs:

Uncontrolled Keywords:

Biological invasions; Fluctuating resources; Interspecific competition; Invasiveness; Stable isotopes

BORIS DOI:

10.7892/boris.132778

URI:

https://boris.unibe.ch/id/eprint/132778

Actions (login required)

Edit item Edit item
Provide Feedback