Low phenotypic plasticity predispose plant species to extinction under
eutrophication
- Annette Baattrup-Pedersen,
- Giulia Cavalli,
- Søren Larsen,
- Liselotte Johansson,
- Tenna Riis
Abstract
The number of urgently threatened species rapidly accelerates and almost
one-third of freshwater biodiversity face extinction. Here, we explore
mechanistic links between eutrophication and ecophysiological trait
plasticity to investigate if plasticity can predict species being
predisposed to extinction. Individuals of five species belonging to the
widespread and prominent genus Potamogeton were selected according to
their historical trend and transplanted into three replicate lakes along
a gradient in nutrient availability. After four weeks of growth, it was
observed that declining species were unable to convert increased
nutrient availability into enhanced rates of growth and that the
ecophysiological plasticity was lower regarding nutrient acquisition and
the ability to adjust physiologically to maximise growth under the
prevailing nutrient regime. We conclude that an important mechanism
behind species declines link to inappropriate ecophysiological
adjustments under nutrient enrichment that likely have severe
consequences for species competitive capabilities under eutrophication,
eventually leading to local extinction.