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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Blind spots in global soil biodiversity and ecosystem function research
Carlos A. Guerra,Anna Heintz-Buschart,Johannes Sikorski,Antonis Chatzinotas,Nathaly R. Guerrero-Ramírez,Simone Cesarz,Léa Beaumelle,Matthias C. Rillig,Fernando T. Maestre,Fernando T. Maestre,Manuel Delgado-Baquerizo,François Buscot,Jörg Overmann,Jörg Overmann,Guillaume Patoine,Helen Phillips,Marten Winter,Tesfaye Wubet,Kirsten Küsel,Richard D. Bardgett,Erin K. Cameron,Don A. Cowan,Tine Grebenc,César Marín,Alberto Orgiazzi,Brajesh K. Singh,Diana H. Wall,Nico Eisenhauer +27 more
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Long-Term Comparison of Attraction of Flying Insects to Streetlights after the Transition from Traditional Light Sources to Light-Emitting Diodes in Urban and Peri-Urban Settings
TL;DR: In this paper, the number of insects attracted by street lamps before and after replacing mercury vapor light sources (MV) with light emitting diodes was assessed in more typical (urban and peri-urban) settings over several years.
References
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