Vlaamse Vereniging voor Entomologie

Butterflies in the Benelux
Frits Bink & Rosita Moenen 2015

Based on: Dagvlinders in de Benelux 2013
Revised and extended
Edited by Sylvain Cuvelier & Peter Russell

Vlaamse Vereniging voor Entomologie
VVE Werkgroep Dagvlinders

Flemish Entomological Society
VVE Workgroup Butterflies

Appendix 2	Appendix 4

Appendix 3. Matrix heat-sums in degree days
Heat-sum, calculated from sine’s area above 10°C.
Y-axis average temperature warmest month, x-axis yearly amplitude.
Row 464 / 2201 in bold are heat-sums corresponding with a climate window of a half year.
Row 1456 / 3276 in bold are heat-sums corresponding with a climate window of whole year open.
Numbers in grey field are values not occurring in Europe.

Appendix 2	Appendix 4

Contact Werkgroep Dagvlinders: Jurgen Couckuyt