Shows how Kerala Bird Atlas data was used to validate the methodology for analysing unstructured data from eBird

1. Use of the Kerala Bird Atlas to validate analyses that use
eBird Data

2. o Use less structured eBird data to understand range, abundance
and population trends of India’s birds
Objective

3. Biases – checklists in 20 km grids

4. Biases – checklists by month

5. o eBird data has large biases in space and time (less structured)
o the Atlas provides a unique opportunity to compare statistically
corrected results from non-Atlas eBird data with Atlas data that is
free from spatiotemporal biases; methods can then be finalized
o the previous step is essential as methods may always be open to
criticism until they are validated (using the Atlas).
o is inference from less structured data reliable?
Problems

6. o Strong correlations
o Use Atlas dry season data to fine tune analytical methods
o Generalised Linear Mixed Models (GLMM)
o p/a ~ log(no. of species) + … + 1|district/hotspot + 1|observer
Calibration of analyses – eBird vs. Kerala Atlas

7. Calibration of analyses – eBird vs. Kerala Atlas

8. o the ability to validate methods using structured Atlas data may
provide us with the analytical template to make a first assessment
of the State of India’s Birds.
Validation