Fern Gametophytes Exhibit Distinct Patterns of Niche Expansion and Convergence in Ecophysiological Functioning

Area of Science:

• Plant Ecology
• Evolutionary Biology
• Physiological Ecology

Background:

• Ferns possess distinct, independent gametophyte and sporophyte life stages.
• The ecological coordination between these stages is not well understood.
• Ferns display remarkable ecological diversity.

Purpose of the Study:

• To test if fern gametophytes occupy novel climatic niche space compared to sporophytes.
• To investigate physiological mechanisms in gametophytes influencing fern ecology.
• To understand drivers of spatial patterns in fern biodiversity.

Main Methods:

• Integration of spatial and climatic data for niche analysis.
• Examination of physiological traits in the gametophyte stage.
• Correlation analysis between ecophysiological function and environmental gradients.

Main Results:

• 57% of studied fern species show gametophytes in novel climate niches.
• Gametophyte niche expansion occurs along specific climate variation axes.
• Gametophyte photosynthetic rates correlate strongly with water demand and precipitation.

Conclusions:

• Fern gametophytes possess previously uncharacterized ecological roles.
• Physiological convergence in gametophytes suggests adaptation to water availability.
• These findings offer insights into mechanisms driving fern biodiversity patterns.