Behavioral and economic traits reflect distinct resource acquisition strategies in tendril vines and stem twining vines

Climbing plants are important components of tropical and many temperate forest ecosystems. Current studies regard climbing plants as a single ecological plant type and ignore the ecological differences resulting from their climbing mechanisms, which may lead to a misrepresentation of the role of climbing plants in forest dynamics. Based on behavioral traits and economic traits of climbing plants, we test the hypothesis that tendril climbers and stem twiners are characterized by different resource acquisition strategies. We quantified and compared 4 behavioral traits and 7 economic traits of four stem twining vines and four tendril vines in a temperate oak forest and further tested their differences in resource acquisition strategy. Our study found that tendril vines were scattered in a group distinct from stem twining vines along the first axes of the principal component analysis using four behavioral traits and seven economic traits, being located at the more acquisitive end with more hosts, a larger distance to length ratio of stem, higher leaf and root nitrogen concentrations, and lower leaf carbon content, while stem twining vines showed the opposite trends. These results indicate that tendril vines have a more acquisitive strategy than stem twining vines. The findings suggest a functional variability among the different climbing mechanisms, and which should be accounted for in future studies.