More than 75 percent decline over 27 years in total flying insect biomass in protected areas.
Caspar A. Hallmann,Martin Sorg,Eelke Jongejans,Henk Siepel,Nick Hofland,Heinz Schwan,Werner Stenmans,Andreas Müller,Hubert Sumser,Thomas Hörren,Dave Goulson,Hans de Kroon +11 more
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This analysis estimates a seasonal decline of 76%, and mid-summer decline of 82% in flying insect biomass over the 27 years of study, and shows that this decline is apparent regardless of habitat type, while changes in weather, land use, and habitat characteristics cannot explain this overall decline.Abstract:
Global declines in insects have sparked wide interest among scientists, politicians, and the general public. Loss of insect diversity and abundance is expected to provoke cascading effects on food webs and to jeopardize ecosystem services. Our understanding of the extent and underlying causes of this decline is based on the abundance of single species or taxonomic groups only, rather than changes in insect biomass which is more relevant for ecological functioning. Here, we used a standardized protocol to measure total insect biomass using Malaise traps, deployed over 27 years in 63 nature protection areas in Germany (96 unique location-year combinations) to infer on the status and trend of local entomofauna. Our analysis estimates a seasonal decline of 76%, and mid-summer decline of 82% in flying insect biomass over the 27 years of study. We show that this decline is apparent regardless of habitat type, while changes in weather, land use, and habitat characteristics cannot explain this overall decline. This yet unrecognized loss of insect biomass must be taken into account in evaluating declines in abundance of species depending on insects as a food source, and ecosystem functioning in the European landscape.read more
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Vulnerability of honey bee queens to heat-induced loss of fertility
Alison McAfee,Abigail Chapman,Heather Higo,Robyn M. Underwood,Joseph P. Milone,Leonard J. Foster,Maria Marta Guarna,David R. Tarpy,Jeffery S. Pettis +8 more
TL;DR: It is found that queens have two potential routes of temperature-stress exposure: within colonies and during routine shipping, and data suggest that temperatures of 15–38 °C are safe for queens at a tolerance threshold of 11.5%, which is the viability difference associated with queen failure in the field.
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Integrating agroecological production in a robust post-2020 Global Biodiversity Framework
Thomas C. Wanger,Thomas C. Wanger,Fabrice DeClerck,Lucas Alejandro Garibaldi,Jaboury Ghazoul,Jaboury Ghazoul,Jaboury Ghazoul,David Kleijn,Alexandra-Maria Klein,Claire Kremen,Harold A. Mooney,Ivette Perfecto,Luke L. Powell,Luke L. Powell,Josef Settele,Josef Settele,Mirco Solé,Teja Tscharntke,Wolfgang W. Weisser +18 more
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Complex long-term dynamics of pollinator abundance in undisturbed Mediterranean montane habitats over two decades
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