Heat waves are becoming more frequent with climate change and their impact on lower and higher trophic levels can differ. Higher trophic levels, such as predators and parasitoids, are predicted to be more strongly affected by heat waves than herbivores because they may have smaller thermal windows and because of altered ecological interactions with lower trophic levels. We tested the effects of heat waves of varying intensity (36-42˚C), imposed for four hours during five consecutive days on the egg stage of an invasive herbivore, the brown marmorated stink bug (Halyomorpha halys) and on various developmental stages of its parasitoid, Trissolcus japonicus. Halyomorpha halys eggs had lower hatching success and fewer nymphs emerging with increasing intensity of heat stress, while exposure during the egg and larval stages of T. japonicus did not decrease adult emergence rates. Heat waves increased development time of parasitoids and decreased adult emergence when pupal stages were exposed. Adult parasitoids experiencing heat stress had lower survival, but their parasitism success overall was not affected. In addition, we detected transgenerational effects whereas emergence success and the number of adult parasitoids emerging in the second generation declined when the parental generation was exposed to 42˚C. Contrary to expectations, the results suggest that H. halys may be more sensitive to heat stress than T. japonicus, at least during early development. Our findings indicate that biological control services provided by T. japonicus can be maintained in the face of increasing heat wave events and point to the importance of following populations beyond the first generation to better understand the long-term consequences of heat stress.

Methods for data collection are described in the manuscript. 

The metadata for the dataset can be found in the first tab, called 'metadata' of the excel file. This explains which sections certain tabs of data belong to in the manuscript as well as what all the column names indicate in each tab.

There are no missing values in the dataset. N/A has been inserted to data points where certain variables could not be calculated due to lack of emergence of parasitoids.