Arthropod decline in grasslands and forests is associated with landscape-level drivers

Date

2019-10-01

Author

Seibold, Sebastian
Gossner, Martin M.
Simons, Nadja K.
Bluethgen, Nico
Mueller, Joerg
Ambarlı, Didem
Ammer, Christian
Bauhus, Juergen
Fischer, Markus
Habel, Jan C.
Linsenmair, Karl Eduard
Nauss, Thomas
Penone, Caterina
Prati, Daniel
Schall, Peter
Schulze, Ernst-Detlef
Vogt, Juliane
Woellauer, Stephan
Weisser, Wolfgang W.

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Recent reports of local extinctions of arthropod species(1), and of massive declines in arthropod biomass(2), point to land-use intensification as a major driver of decreasing biodiversity. However, to our knowledge, there are no multisite time series of arthropod occurrences across gradients of land-use intensity with which to confirm causal relationships. Moreover, it remains unclear which land-use types and arthropod groups are affected, and whether the observed declines in biomass and diversity are linked to one another. Here we analyse data from more than 1 million individual arthropods (about 2,700 species), from standardized inventories taken between 2008 and 2017 at 150 grassland and 140 forest sites in 3 regions of Germany. Overall gamma diversity in grasslands and forests decreased over time, indicating loss of species across sites and regions. In annually sampled grasslands, biomass, abundance and number of species declined by 67%, 78% and 34%, respectively. The decline was consistent across trophic levels and mainly affected rare species; its magnitude was independent of local land-use intensity. However, sites embedded in landscapes with a higher cover of agricultural land showed a stronger temporal decline. In 30 forest sites with annual inventories, biomass and species number-but not abundance-decreased by 41% and 36%, respectively. This was supported by analyses of all forest sites sampled in three-year intervals. The decline affected rare and abundant species, and trends differed across trophic levels. Our results show that there are widespread declines in arthropod biomass, abundance and the number of species across trophic levels. Arthropod declines in forests demonstrate that loss is not restricted to open habitats. Our results suggest that major drivers of arthropod decline act at larger spatial scales, and are (at least for grasslands) associated with agriculture at the landscape level. This implies that policies need to address the landscape scale to mitigate the negative effects of land-use practices.

URI

https://hdl.handle.net/11511/100713

Journal

NATURE

DOI

https://doi.org/10.1038/s41586-019-1684-3

Collections

Department of Biology, Article

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Citation Formats

S. Seibold et al., “Arthropod decline in grasslands and forests is associated with landscape-level drivers,” NATURE, vol. 574, no. 7780, pp. 671–688, 2019, Accessed: 00, 2022. [Online]. Available: https://hdl.handle.net/11511/100713.