Endangered plants persist under phosphorus limitation.

Area of Science:

• Ecology
• Environmental Science
• Conservation Biology

Background:

• Temperate terrestrial ecosystems face plant species loss.
• Nitrogen enrichment is a suspected driver of this decline, based on negative correlations between species richness and high productivity/nitrogen levels.
• The specific nutrient responsible for species loss has not been confirmed on a large geographical scale.

Purpose of the Study:

• To investigate the role of nutrient limitation in plant species loss across a large geographical gradient.
• To determine whether nitrogen or phosphorus enrichment is the primary cause of declining species richness in temperate herbaceous ecosystems.
• To provide evidence for effective conservation strategies regarding nutrient management.

Main Methods:

• Studied species richness in herbaceous ecosystems along a Eurasian transect.
• Examined a gradient of atmospheric nitrogen deposition, from high levels in western Europe to background levels in Siberia.
• Assessed nutrient limitation (nitrogen vs. phosphorus) in relation to plant species persistence.

Main Results:

• Observed that many more endangered plant species persist under phosphorus-limited conditions compared to nitrogen-limited conditions.
• Found a stronger link between phosphorus availability and species loss than previously assumed for nitrogen.
• Highlighted regional differences in nutrient deposition and their impact on biodiversity.

Conclusions:

• Enhanced phosphorus availability is a more probable cause of species loss in temperate terrestrial ecosystems than nitrogen enrichment.
• Urgent need for a better understanding of phosphorus enrichment mechanisms.
• Conservation management must prioritize reducing phosphorus availability to protect plant biodiversity.