The Royal Society

Supplementary material from "Temperature and water availability drive insect seasonality across a temperate and a tropical region"

Posted on 2024-06-03 - 15:55
The more insects there are, the more food there is for insectivores and the higher the likelihood for insect-associated ecosystem services. Yet, we lack insights into the drivers of insect biomass over space and seasons, both for tropical and temperate zones. We used 245 Malaise traps, managed by 191 volunteers and park guards, to characterise year-round flying insect biomass in a temperate (Sweden) and a tropical (Madagascar) country. Surprisingly, we found that local insect biomass was similar across zones. In Sweden, local insect biomass increased with accumulated heat and varied across habitats, while biomass in Madagascar was unrelated to the environmental predictors measured. Drivers behind seasonality partly converged: In both countries, the seasonality of insect biomass differed between warmer and colder sites, and wetter and drier sites. In Sweden, short-term deviations from expected season-specific biomass were explained by week-to-week fluctuations in accumulated heat, rainfall and soil moisture, whereas in Madagascar, weeks with higher soil moisture had higher insect biomass. Overall, our study identifies key drivers of the seasonal distribution of flying insect biomass in a temperate and a tropical climate. This knowledge is key to understanding the spatial and seasonal availability of insects—as well as predicting future scenarios of insect biomass change.


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Proceedings of the Royal Society B: Biological Sciences


Laura J. A. van Dijk
Brian L. Fisher
Andreia Miraldo
Robert M. Goodsell
Elzbieta Iwaszkiewicz-Eggebrecht
Dimby Raharinjanahary
Eric Tsiriniaina Rajoelison
Piotr Łukasik
Anders F. Andersson
Fredrik Ronquist
Tomas Roslin
Ayco J. M. Tack
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