How to protect bumblebees from heat
Bumblebees try to maintain a temperature of 28°C inside the hive in any environmental conditions. Above 28°C the pollination capacity is reduced as their [...] their activity is focused on cooling the hive. Above 32°C pollination may stop due to damage to the hive. Bumblebees therefore need to keep cool in hot summer [...] be also reduced caused by low humidity and high radiant heath. Even at 28° C, pollination can be reduced if the humidity is too low or radiation is too