Wilkes, Martin A and Mckenzie, Morwenna and Johnson, Andrew and Hassall, Christopher and Kelly, Martyn and Willby, Nigel and Brown, Lee (2025) Revealing hidden sources of uncertainty in biodiversity trend assessments. Ecography, 5 (5). e07441. DOI https://doi.org/10.1111/ecog.07441
Wilkes, Martin A and Mckenzie, Morwenna and Johnson, Andrew and Hassall, Christopher and Kelly, Martyn and Willby, Nigel and Brown, Lee (2025) Revealing hidden sources of uncertainty in biodiversity trend assessments. Ecography, 5 (5). e07441. DOI https://doi.org/10.1111/ecog.07441
Wilkes, Martin A and Mckenzie, Morwenna and Johnson, Andrew and Hassall, Christopher and Kelly, Martyn and Willby, Nigel and Brown, Lee (2025) Revealing hidden sources of uncertainty in biodiversity trend assessments. Ecography, 5 (5). e07441. DOI https://doi.org/10.1111/ecog.07441
Abstract
Idiosyncratic decisions during the biodiversity trend assessment process may limit reproducibility, whilst ‘hidden' uncertainty due to collection bias, taxonomic incompleteness, and variable taxonomic resolution may limit the reliability of reported trends. We model alternative decisions made during assessment of taxon-level abundance and distribution trends using an 18-year time series covering freshwater fish, invertebrates, and primary producers in England. Through three case studies, we test for collection bias and quantify uncertainty stemming from data preparation and model specification decisions, assess the risk of conflating trends for individual species when aggregating data to higher taxonomic ranks, and evaluate the potential uncertainty stemming from taxonomic incompleteness. Choice of optimizer algorithm and data filtering to obtain more complete time series explained 52.5% of the variation in trend estimates, obscuring the signal from taxon-specific trends. The use of penalized iteratively reweighted least squares, a simplified approach to model optimization, was the most important source of uncertainty. Application of increasingly harsh data filters exacerbated collection bias in the modelled dataset. Aggregation to higher taxonomic ranks was a significant source of uncertainty, leading to conflation of trends among protected and invasive species. We also found potential for substantial positive bias in trend estimation across six fish populations which were not consistently recorded in all operational areas. We complement analyses of observational data with in silico experiments in which monitoring and trend assessment processes were simulated to enable comparison of trend estimates with known underlying trends, confirming that collection bias, data filtering and taxonomic incompleteness have significant negative impacts on the accuracy of trend estimates. Identifying and managing uncertainty in biodiversity trend assessment is crucial for informing effective conservation policy and practice. We highlight several serious sources of uncertainty affecting biodiversity trend analyses and present tools to improve the transparency of decisions made during the trend assessment process.
Item Type: | Article |
---|---|
Uncontrolled Keywords: | Biodiversity monitoring; biodiversity trend assessment; collection bias; model specification uncertainty; taxonomic completeness; taxonomic resolution |
Divisions: | Faculty of Science and Health Faculty of Science and Health > Life Sciences, School of |
SWORD Depositor: | Unnamed user with email elements@essex.ac.uk |
Depositing User: | Unnamed user with email elements@essex.ac.uk |
Date Deposited: | 30 May 2025 09:18 |
Last Modified: | 30 May 2025 09:20 |
URI: | http://repository.essex.ac.uk/id/eprint/39970 |
Available files
Filename: Ecography - 2025 - Wilkes - Revealing hidden sources of uncertainty in biodiversity trend assessments.pdf
Licence: Creative Commons: Attribution 4.0