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Biological invasions have been associated with niche changes; however, their occurrence is still debated. We assess whether climatic niches between native and non-native ranges have changed during the invasion process using two globally spread mosquitoes as model species,  Aedes albopictus  and  Aedes aegypti . Considering the different time spans since their invasions (>300 vs. 30–40 years), niche changes were expected to be more likely for  Ae .  aegypti  than for  Ae .  albopictus . We used temperature and precipitation variables as descriptors for the realized climatic niches and different niche metrics to detect niche dynamics in the native and non-native ranges. High niche stability, therefore, no niche expansion but niche conservatism was revealed for both species. High niche unfilling for  Ae .  albopictus  indicates a great potential for further expansion. Highest niche occupancies in non-native ranges occurred either under more temperate (North America, Europe) or tropical conditions (South America, Africa).  Aedes aegypti  has been able to fill its native climatic niche in the non-native ranges, with very low unfilling. Our results challenge the assumption of rapid evolutionary change of climatic niches as a requirement for global invasions but support the use of native range-based niche models to project future invasion risk on a large scale.

Niche conservatism of Aedes albopictus and Aedes aegypti - two mosquito species with different invasion histories