Supporting information 1: Motivation selected temperatures
For the experiment we selected two temperatures that reflected the mean water temperatures
during the summer in southern Scandinavia and Southern France, respectively. We based this
selection on water temperature data collected in two shallow water bodies, Pankakasjön
(56°40'N - 13°06'E, southern Sweden) and Pisci-Sud (Marais du Vigueirat 43°31’N – 4°46’E,
Southern France). At each site water temperatures were recorded using data loggers at a depth
of 10-30 cm which gives a good estimate of the water temperatures that final instar larvae
experience as they preferentially occur in the shallow littoral zone (Van de Meutter et al.
2004), often close to the water surface as observed in other damselfly species (Johansson
2000).
In Pankakasjön water temperatures were recorded every hour during the period 1 July
2009 – 1 July 2010 (data set collected by Frank Suhling, University of Braunschweig, and
Gorän Sahlen, Halmstad University). In Pisci-Sud water temperatures were recorded every
two hours during the period 5 July 2008 – 4 September 2012 (data set collected by Alain Jean
Crivelli, Centre de recherche pour la conservation des zones humides méditerranéennes, Tour
du Valat). From these data sets we selected the subset of water temperatures collected during
summer. The resulting mean summer water temperatures closely resembled 20°C and 24°C,
in the water body in southern Scandinavia and Southern France, respectively (Table S1).
Table S1. Summary of water temperatures during the summer period in two shallow water
bodies situated in Southern Scandinavia (Pankakasjön) and Southern France (Pisci-sud). N =
number of temperature recordings.
N
Mean
SE
Lower
Higher
Quartile
Quartile
Pankakasjön
2029
19.60°C
0.07°C
17.60°C
21.26°C
Pisci-Sud
5174
23.97°C
0.05°C
21.82°C
26.5°C
References
Johansson F (2000) The slow-fast characteristics in a suite of six species of odonate larvae.
Freshwater Biology, 43, 149-159.
Van de Meutter F, Stoks R, De Meester L (2004) Behavioral linkage of pelagic prey and
littoral predators: microhabitat selection by Daphnia induced by damselfly larvae. Oikos, 107,
265-272.