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

Sergio J Ceballos1,2, Ezequiel Aráoz1,2, Tobías Nicolás Rojas1,3

  • 1Instituto de Ecología Regional (IER), Universidad Nacional de Tucumán (UNT)-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Yerba Buena 4107, Tucumán, Argentina.

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Summary

Vascular epiphytes and lianas co-occur on 20% of trees in Argentinian montane forests. Larger trees and mature forests promote their shared habitat, influencing species interactions.

Keywords:
Yungascanopy ecologycompetitionspecies interactionstrees

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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.