Controversy over the decline of arthropods: a matter of temporal baseline?

10.24072/pcjournal.131 - Peer Community Journal, Volume 2 (2022), article no. e33.

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Recently, a number of studies have reported somewhat contradictory patterns of temporal trends in arthropod abundance, from decline to increase. Arthropods often exhibit non-monotonous variation in abundance over time, making it important to account for temporal coverage in interpretation of abundance trends, which is often overlooked in statistical analysis. Combining four recently analysed datasets that led to contrasting outcomes, we first show that temporal abundance variations of arthropods are non-monotonous. Using simulations, we show non-monotony is likely to bias estimated linear abundance trends. Finally, analysing empirical data, we show that heterogeneity in estimated abundance trends is significantly related to the variation in temporal baseline of analysed time series. Once differences in baseline years, habitats and continents are accounted for, we do not find any statistical difference in estimated linear abundance trends among the four datasets. We also show that short time series produce more stochastic abundance trends than long series, making the dearth of old and long-term time series a strong limitation in the assessment of temporal trends in arthropod abundance. The lack of time series with a baseline year before global change acceleration is likely to lead to an underestimation of global change effects on biodiversity.

Published online:
DOI: 10.24072/pcjournal.131
Duchenne, François 1; Porcher, Emmanuelle 2; Mihoub, Jean-Baptiste 2; Loïs, Grégoire 2, 3; Fontaine, Colin 2

1 Biodiversity and Conservation Biology Research Centre, Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), 8903 Birmensdorf, Switzerland
2 Centre d'Ecologie et des Sciences de la Conservation (CESCO), Muséum national d'Histoire naturelle, CNRS, Sorbonne Université, 75005 Paris, France
3 Office Français de la Biodiversité, 94080 Vincennes, France
     author = {Duchenne, Fran\c{c}ois and Porcher, Emmanuelle and Mihoub, Jean-Baptiste and Lo{\"\i}s, Gr\'egoire and Fontaine, Colin},
     title = {Controversy over the decline of arthropods: a matter of temporal baseline?},
     journal = {Peer Community Journal},
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     volume = {2},
     year = {2022},
     doi = {10.24072/pcjournal.131},
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Duchenne, François; Porcher, Emmanuelle; Mihoub, Jean-Baptiste; Loïs, Grégoire; Fontaine, Colin. Controversy over the decline of arthropods: a matter of temporal baseline?. Peer Community Journal, Volume 2 (2022), article  no. e33. doi : 10.24072/pcjournal.131.

Peer reviewed and recommended by PCI : 10.24072/pci.ecology.100098

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