Rattan spines as deterrence? A spinescence study on different species of rattans

Area of Science:

• Botany
• Plant Morphology
• Ecology

Background:

• Rattan spines are typically viewed as identification markers or physical defense structures.
• The functional significance of rattan spinescence beyond basic protection remains underexplored.
• Understanding rattan spine diversity is crucial for appreciating its ecological adaptations.

Purpose of the Study:

• To investigate the diverse spinescence traits across five species of rattan.
• To assess the role of rattan spines in deterring small climbing mammals.
• To explore the multifaceted functions of rattan spines in plant survival and interaction.

Main Methods:

• Quantified spinescence traits including length, width, angle, strength, density, and color in five rattan species.
• Analyzed leaf trichomes in select species (D. lewisiana, C. castaneus, D. geniculata).
• Conducted choice selection experiments with Plectomia griffithii and Calamus castaneus to test mammal deterrence.

Main Results:

• Significant variation in spine traits was observed, precluding categorization of species as more or less spinescent.
• Spines on a single stem did not deter small climbing mammals in choice experiments.
• Leaf trichome presence and characteristics were also documented for specific species.

Conclusions:

• Rattan spines likely serve roles beyond simple physical defense, interacting with other plant characteristics.
• The effectiveness of spines in deterring mammals may depend on context or combination with other traits.
• Further research using alternative methodologies is needed to fully elucidate rattan spine functions.