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How Environment and Urbanization Shape Bird Diversity in Sri Lanka

Dilusha Chandrasiri, Maneesha Herath, Yasith Hewarathna, Muditha Herath, Gishan Bandara, Madara Mendis, Nathali Athukorala, Nisansa de Silva, Sandareka Wickramanayake

Featured July 30, 2026

Original Paper

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Simply

By combining bird sightings with satellite data, the study found that the *type* of land (like forest vs. farm) is more important for bird numbers than just how green it is, even after carefully fixing for where people looked for birds.

In depth
The study provides a comprehensive, nationwide analysis of bird diversity in Sri Lanka by integrating diverse spatial, temporal, and environmental datasets. A key innovation is the comparison of categorical land-cover types against continuous environmental variables within the same modeling framework, revealing land cover as a stronger predictor of species richness. Furthermore, the authors rigorously address sampling biases inherent in citizen-science data through spatial thinning and effort-corrected temporal metrics, offering a robust framework for biodiversity research.

Key Takeaways

  • 1
    The paper demonstrates that land-cover type is a more effective predictor of bird species richness than continuous environmental variables like NDVI or temperature alone.
  • 2
    The authors developed a robust framework for integrating citizen-science data with remote sensing and climate data, employing rigorous bias correction techniques like spatial thinning and rarefaction.
  • 3
    Urbanization, proxied by Artificial Light At Night (ALAN), exhibits scale-dependent effects, reducing community evenness at the district level but not cell-level richness after accounting for sampling effort.

Conceptual Flow

HIGH LEVEL
1
Methodology: Combining Diverse Data for Bird Diversity

The study gathered bird sightings, satellite images, and weather data, then cleaned it up to understand what affects bird numbers.

Bird Sightings
Satellite Images
Weather Data
Clean and Combine
Unified Bird Data
2
Results: Land Type Matters More Than Greenness

They discovered that the kind of land, like a forest or a city, was a better sign of how many different birds there were than just how green the area looked.

Land Type
Greenness Level
Predict Bird Numbers
Land Type: Stronger Link
Greenness: Weaker Link