Main content area

Seasonal change in light partitioning among coexisting species of different functional groups along elevation gradient in subalpine moorlands

Kamiyama, Chiho, Oikawa, Shimpei, Hikosaka, Kouki
The new phytologist 2014 v.204 no.4 pp. 913-923
absorption, altitude, biomass, heathlands, leaves, niches, plant communities, seasonal variation, spring, summer
Species niches are expected to differ between different functional groups and between species with different functional traits. However, it is still unclear how functional traits contribute to niche separation between species coexisting in a community and between sites along environmental gradients. We studied seasonal changes in light partitioning among coexisting species belonging to different functional groups in moorland plant communities at different altitudes. We estimated the lifetime light absorption per unit invested leaf biomass (ΦLₗₑₐfₘₐₛₛ) as a measure of the benefit/cost ratio of light acquisition. Evergreen species absorbed more light in spring, whereas deciduous species absorbed more light in summer. A similar tradeoff was also found between short and tall species within each functional group. As a result, evergreen and shorter species had comparable ΦLₗₑₐfₘₐₛₛ values to those of deciduous and taller species. Evergreen species had higher ΦLₗₑₐfₘₐₛₛ at higher altitudes relative to deciduous species, suggesting that evergreen habit is more advantageous for the lifetime light interception at higher altitudes. Our results demonstrate that phenological tradeoffs for light partitioning can contribute to the coexistence of species with different functional traits. Our results also reveal that the most advantageous traits differ depending on environment.