Browsing by Subject "abundance"

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  • Jukola-Sulonen, Eeva-Liisa; Salemaa, Maija (Suomen metsätieteellinen seura, 1985)
  • Hoekman, David; LeVan, Katherine E.; Ball, George E.; Browne, Robert A.; Davidson, Robert L.; Erwin, Terry L.; Knisley, C. Barry; LaBonte, James R.; Lundgren, Jonathan; Maddison, David R.; Moore, Wendy; Niemelä, Jari; Ober, Karen A.; Pearson, David L.; Spence, John R.; Will, Kipling; Work, Timothy (2017)
    The National Ecological Observatory Network (NEON) will monitor ground beetle populations across a network of broadly distributed sites because beetles are prevalent in food webs, are sensitive to abiotic factors, and have an established role as indicator species of habitat and climatic shifts. We describe the design of ground beetle population sampling in the context of NEON's long-term, continentalscale monitoring program, emphasizing the sampling design, priorities, and collection methods. Freely available NEON ground beetle data and associated field and laboratory samples will increase scientific understanding of how biological communities are responding to land-use and climate change.
  • Jähnig, Sonja C.; Baranov, Viktor; Altermatt, Florian; Cranston, Peter; Friedrichs-Manthey, Martin; Geist, Juergen; He, Fengzhi; Heino, Jani; Hering, Daniel; Hölker, Franz; Jourdan, Jonas; Kalinkat, Gregor; Kiesel, Jens; Leese, Florian; Maasri, Alain; Monaghan, Michael T.; Schäfer, Ralf B.; Tockner, Klement; Tonkin, Jonathan D.; Domisch, Sami (Wiley, 2020)
    WIREs Water 8 (2020)
    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 tolocal conditions or nonrandom site selection. We conclude that the results of the meta-analysis should not be considered indicative of an overall improve ment in the condition of freshwater ecosystems.