Predator Loss Drives Functional Shifts in Termite-Mediated Wood Decomposition in Tropical Forests

Area of Science:

• Ecology
• Tropical Biology
• Conservation Biology

Background:

• Termites are crucial for wood decomposition and nutrient cycling in tropical forests.
• The impact of predator loss on termite ecology and ecosystem functions is not well understood.

Purpose of the Study:

• To investigate how the absence of the Northern Tamandua affects termite spatial ecology and wood consumption.
• To compare termite nest density, nest characteristics, and wood consumption rates in predator-free versus predator-present habitats.

Main Methods:

• Focused on arboreal termites (Microcerotermes arboreus and Nasutitermes spp.) in Panama.
• Compared colony density, nest characteristics (height, volume), and wood consumption rates between predator-free and predator-present sites.
• Analyzed relationships between nest density, nest placement, and wood consumption.

Main Results:

• Predator-free sites had higher termite nest density, lower nest height, and greater wood consumption.
• Nest height correlated nonlinearly with canopy height, suggesting predation risk influences nest placement.
• Increased wood consumption in predator-free areas was linked to higher foraging activity, not species turnover.

Conclusions:

• The loss of a vertebrate predator can significantly alter termite communities and ecosystem processes like wood decomposition.
• Trophic interactions are vital for regulating forest ecosystems, and defaunation has cascading ecological consequences.
• Understanding predator-prey dynamics is essential for predicting changes in tropical forest functioning.