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Bird Migration Shifts: Chennai Sees Visitors, Madurai Doesn't
10 May
Summary
- Common pochard sighted in Chennai but absent from Madurai's winter route.
- Global population decline affects migratory bird spread to India.
- Habitat, food, climate, and population impact bird migration choices.
Migratory birds are adapting their wintering grounds, influenced by various environmental and demographic factors. The Common pochard, a species now classified as 'Near Threatened' due to global population decline, exemplifies these shifts. Observations in Tamil Nadu show this bird appearing sporadically in the Chennai Metropolitan Area, including Kancheepuram and Chengalpet districts, with recent sightings at Amoor lake.
Conversely, Madurai, once a consistent stop on the Common pochard's winter itinerary, is no longer regularly visited by the species. While habitat degradation is a potential cause for changing migration patterns, surface-level assessment in Madurai does not strongly support this. The decline in the Common pochard's overall numbers suggests that fewer birds are migrating deep into peninsular India.
This reduced migratory spread could be due to birds finding ample suitable habitats, or 'seats', in wetlands across central and northern India. Other reasons for altering wintering addresses include scarcity of food and climatic changes. Dr. T. Badri Narayanan emphasizes that pinpointing specific causes requires extensive data gathered over a decade or more, highlighting the value of citizen-science platforms like eBird for such long-term monitoring.
