Researchers warn that erratic weather patterns and rising temperatures are fundamentally shifting the biological timing of forests in the Western Ghats.
- Annual temperature rise of 0.01°C and rainfall decrease of 3.97mm recorded.
- Significant shifts in 'Start of Season' (SOS) phenology across four forest types.
- High-altitude Shola forests are losing their characteristic moisture-retaining microclimates.
The impacts of climate change in the Nilgiri Biosphere Reserve (NBR) have moved beyond visible water scarcity to a more insidious threat: the destabilization of forest ecosystems. A recent study published in the scientific journal Remote Sensing highlights how erratic weather is disrupting the fundamental biological rhythms of the Western Ghats' native forests.
By analyzing two decades of satellite imagery (2000–2020), researchers tracked how changing temperature and rainfall patterns affect vegetation. The data reveals a concerning trend: between 1950 and 2018, the NBR saw an annual temperature increase of 0.01 degrees Celsius and an average annual rainfall decline of 3.97 millimeters. These shifts are directly impacting moist deciduous, dry deciduous, semi-evergreen, and wet evergreen forests.
The Shifting Biological Calendar
The study mapped the 'Start of Season' (SOS) and 'End of Season' to understand ecological shifts. Interestingly, the patterns were inconsistent. Between 2001 and 2010, the growing season was delayed across all forest types. However, during the 2011–2020 period, the pattern flipped, with the season starting much earlier. Bodi Surya Pratap Chandra Kishore, a co-author of the study, noted that climate change isn't just making forests 'greener' or 'less green'; it is fundamentally altering the timing of their biological activity.
Climate change is not simply making forests greener or less green; it is changing the timing of their biological activity.
Why This Matters
BozokMedia analysis shows that such phenological shifts can lead to 'ecological mismatches.' When the timing of flowering or leafing changes, it can decouple the relationship between plants and the pollinators or herbivores that depend on them. In a biodiversity hotspot like the Nilgiris, this disruption can trigger a domino effect across the entire food web.
Restoration ecologist Godwin Vasanth Bosco pointed out that the most visible damage is occurring in the Shola forests—the high-altitude tropical montane forests. These unique ecosystems are designed to hold their own cool, moist microclimate. However, as temperatures rise and humidity drops, the epiphytes, mosses, and orchids that define these forests are visibly drying up and yellowing.
Frequently Asked Questions
1. How does climate change affect the Nilgiri forests?
It alters the timing of when plants grow and flower, which can disrupt the entire ecosystem's balance.
2. What are Shola forests?
Sholas are high-altitude montane forests in the Western Ghats known for their unique, self-contained moist microclimates.
