Fig. 1

Geographical location and seawater temperature at the collecting sites for Dosinia exoleta along the Portuguese coast (Aveiro, Setúbal and Faro). Shadow squares denote the collecting sites. Seawater temperature monitored during 2010 by the oceanographic buoys closest to the collecting sites. Error bars represent monthly standard deviation, and interrupted lines represent annual mean and range (minimum–maximum) in seawater temperature