Exploring Co-Occurrence Patterns to Understand Epiphyte-Liana Interactions.

Area of Science:

• Ecology
• Botany
• Forest Science

Background:

• Epiphytes and lianas inhabit the same forest environments but are often studied in isolation.
• Understanding their co-occurrence is crucial for comprehending forest dynamics and biodiversity.

Purpose of the Study:

• To investigate the co-occurrence patterns of vascular epiphytes and lianas in subtropical montane forests.
• To identify factors influencing the shared habitat of these plant groups.

Main Methods:

• Field surveys were conducted in 120 plots (20x20m) in the Sierra de San Javier, Argentina.
• Epiphyte cover and liana basal area were measured on trees with a diameter at breast height (dbh) of ≥10 cm.
• Data from 2111 trees were analyzed to determine co-occurrence frequencies and influencing variables.

Main Results:

• 34% of trees hosted lianas, 52% hosted epiphytes, and 20% hosted both.
• Liana and epiphyte richness, liana basal area, and epiphyte cover increased with tree diameter.
• Mature forests showed higher values for these metrics compared to successional forests.
• Larger trees were more likely to host both groups; smaller trees hosted either lianas or epiphytes.
• Epiphyte species showed a higher probability of co-occurring with lianas possessing specialized climbing mechanisms.

Conclusions:

• Tree size and forest type (mature vs. successional) are significant determinants of liana and epiphyte co-occurrence.
• This research provides a foundation for further studies on the ecological interactions between these two plant guilds.
• Investigating shared habitats is essential for a holistic understanding of forest ecosystems.