Species in News: Lion-Tailed Macaques
Context:
A recent study published in the Journal for Nature Conservation reveals that the endangered lion-tailed macaque (Macaca silenus) is demonstrating unexpected resilience, with populations holding steady and even increasing within fragmented landscapes of the Western Ghats.
Key Characteristics and Habitat:
The lion-tailed macaque is an endangered, highly arboreal primate endemic to the evergreen forests of the Western Ghats.
Historically, it was believed their survival depended entirely on large, continuous tracts of undisturbed forest due to their reliance on complex canopies.
Principal population strongholds include the Nilgiri-Silent Valley landscape, the Anamalai-Parambikulam complex, Karnataka's Sharavathi Valley, and the Agasthyamalai ranges.
Findings on Resilience:
Long-term demographic studies in Tamil Nadu’s Anamalai landscape (Valparai plateau) indicate that macaque troops have survived in small plantation-embedded rainforest fragments for over 40 years.
This survival is driven by behavioral plasticity: -
The macaques are adapting by using the ground more frequently, crossing roads, and occasionally exploiting cultivated crops or human food waste.
Survival in these altered environments is also supported by ecological lifelines like remnant canopy patches, native fruiting trees, and targeted conservation measures like canopy bridges.
Key Threats and Challenges:
Despite showing adaptability, the species remains fragile, with only a few thousand individuals left.
Habitat fragmentation severely disrupts dispersal patterns and genetic exchange, leading to long-term genetic isolation that threatens reproductive success.
Living in human-modified landscapes exposes them to new mortality risks, including vehicle collisions, electrocution from power lines, and attacks by feral dogs.
Historical Significance:
It became a symbol of the Silent Valley movement, which successfully halted a proposed hydroelectric project to save its pristine habitat, leading to the creation of Silent Valley National Park.