Fig. 1
From: Autumn migration of the migrant hawker (Aeshna mixta) at the Baltic coast
(a) Frequency distribution of δ2Hn wing values. (b) Contribution of the two populations (2015). (c) Caught individuals and wind directions (2009, 2010). In (b), the contribution of the two populations at each collection day was expressed as percentage of the total caught individuals and the prevailing wind direction is depicted. The relationship between caught individuals and wind directions in (c) is provided as an average of the sum of individuals caught per day standardised to the number of hours the respective wind direction prevailed during the collection period at that day