Revisiting global trends in freshwater insect biodiversity

  • A recent global meta‐analysis reported a decrease in terrestrial but increase in freshwater insect abundance and biomass (van Klink et al., Science 368, p. 417). The authors suggested that water quality has been improving, thereby challenging recent reports documenting drastic global declines in freshwater biodiversity. We raise two major concerns with the meta‐analysis and suggest that these account for the discrepancy with the declines reported elsewhere. First, total abundance and biomass alone are poor indicators of the status of freshwater insect assemblages, and the observed differences may well have been driven by the replacement of sensitive species with tolerant ones. Second, many of the datasets poorly represent global trends and reflect responses to local conditions or nonrandom site selection. We conclude that the results of the meta‐analysis should not be considered indicative of an overall improvement in the condition of freshwater ecosystems.

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Author:Sonja C. Jähnig, Viktor Baranov, Florian Altermatt, Peter Cranston, Martin Friedrichs‐Manthey, Juergen Geist, Fengzhi He, Jani Heino, Daniel Hering, Franz Hölker, Jonas JourdanORCiDGND, Gregor Kalinkat, Jens Kiesel, Florian Leese, Alain Maasri, Michael T. Monaghan, Ralf B. Schäfer, Klement TocknerORCiDGND, Jonathan D. Tonkin, Sami DomischGND
Parent Title (German):Wiley interdisciplinary reviews : WIREs. Water
Place of publication:Hoboken, NJ
Document Type:Article
Date of Publication (online):2020/12/31
Date of first Publication:2020/12/31
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2021/03/03
Tag:freshwater ecosystems; insect abundance; long-term research; threats
Issue:2, e1506
Page Number:5
First Page:1
Last Page:5
Institutes:Biowissenschaften / Biowissenschaften
Biowissenschaften / Institut für Ökologie, Evolution und Diversität
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 59 Tiere (Zoologie) / 590 Tiere (Zoologie)
Licence (German):License LogoCreative Commons - Namensnennung 4.0