Trends in winter migration of birds in Northern France

Thierry Onkelinx

thierry.onkelinx@inbo.be

https://doi.org/10.21436/inbor.16917180

Commissioned by Naturaconsta

1 Introduction

Naturaconsta provided the raw observations of the winter migration bird counts in France. 31 sites where visted repeatedly resulting in 1206. The observer notes the species, the number of birds and the hour after sunset. Chapter 2 describes the data and the further data preparation in detail. The statistical analysis is described in chapter 3. The last chapter gives the results for each species.