Contrasting patterns of intraspecific trait variability in native and non-native plant species along an elevational gradient on Tenerife, Canary Islands. (22nd April 2020)

• Record Type: Journal Article
• Authors: Kühn, Paul; Ratier Backes, Amanda; Römermann, Christine; Bruelheide, Helge; Haider, Sylvia
• Is Part Of: Annals of botany. Volume 127:Number 4(2021)
• Page Start: 565
• Page End: 576
• Publication Date: 2020-04-22
• Subjects: Intraspecific trait variation -- phenotypic plasticity -- plant functional traits -- functional diversity -- elevation gradient -- altitudinal gradient -- alien -- exotic -- invasion success -- forbs -- near-infrared spectroscopy; Botany -- Periodicals; 580
• DOI: 10.1093/aob/mcaa067
• Languages: English
• ISSNs: 0305-7364

Abstract

Abstract: Background and Aims: Non-native plant species are not restricted to lowlands, but increasingly are invading high elevations. While for both native and non-native species we expected variability of plant functional traits due to the changing environmental conditions along elevational gradients, we additionally assumed that non-native species are characterized by a more acquisitive growth strategy, as traits reflecting such a strategy have been found to correlate with invasion success. Furthermore, the typical lowland introduction of non-native species coming from multiple origins should lead to higher trait variability within populations of non-native species specifically at low elevations, and they might therefore occupy a larger total trait space. Methods: Along an elevational gradient ranging from 55 to 1925 m a.s.l. on Tenerife, we collected leaves from eight replicate individuals in eight evenly distributed populations of five native and six non-native forb species. In each population, we measured ten eco-morphological and leaf biochemical traits and calculated trait variability within each population and the total trait space occupied by native and non-native species. Key Results: We found both positive (e.g. leaf dry matter content) and negative (e.g. leaf N) correlations with elevation for native species, but only few responses for non-native species. For non-native species, within-population variability of leaf dry matter content and specific leaf area decreased with elevation, but increased for native species. The total trait space occupied by all non-native species was smaller than and a subset of that of native species. Conclusions: We found little evidence that intraspecific trait variability is associated with the success of non-native species to spread towards higher elevations. Instead, for non-native species, our results indicate that intermediate trait values that meet the requirements of various conditions are favourable across the changing environmental conditions along elevational gradients. As a consequence, this might prevent non-native species from overcoming abruptly changing environmental conditions, such as when crossing the treeline.