Unstructured citizen science data fail to detect long‐term population declines of common birds in Denmark

Diversity and Distributions - Tập 22 Số 10 - Trang 1024-1035 - 2016
Johannes Kamp1,2, Steffen Oppel2, Henning Heldbjerg3,4, Timme Nyegaard3, Paul F. Donald2
1Institute of Landscape Ecology, University of Münster, Heisenbergstr. 2, 48149 Münster, Germany
2RSPB Centre for Conservation Science, Royal Society for the Protection of Birds, The David Attenborough Building, Pembroke Street, Cambridge CB2 3QZ, UK
3Dansk Ornitologisk Forening (DOF), BirdLife Denmark Vesterbrogade 140 DK‐1620 København Denmark
4Department of Bioscience, Aarhus University, Kalø, Grenåvej 14, DK 8410 Rønde, Denmark

Tóm tắt

AbstractAimLong‐term monitoring of biodiversity is necessary to identify population declines and to develop conservation management. Because long‐term monitoring is labour‐intensive, resources to implement robust monitoring programmes are lacking in many countries. The increasing availability of citizen science data in online public databases can potentially fill gaps in structured monitoring programmes, but only if trends estimated from unstructured citizen science data match those estimated from structured monitoring programmes. We therefore aimed to assess the correlation between trends estimated from structured and unstructured data.LocationDenmark.MethodsWe compared population trends for 103 bird species estimated over 28 years from a structured monitoring programme and from unstructured citizen science data to assess whether trends estimated from the two data sources were correlated.ResultsTrends estimated from the two data sources were generally positively correlated, but less than half the population declines identified from the structured monitoring data were recovered from the unstructured citizen science data. The mismatch persisted when we reduced the structured monitoring data from count data to occurrence data to mimic the information content of unstructured citizen science data and when we filtered the unstructured data to reduce the number of incomplete lists reported. Mismatching trends were especially prevalent for the most common species. Worryingly, more than half the species showing significant declines in the structured monitoring showed significant positive trends in the citizen science data.Main conclusionsWe caution that unstructured citizen science databases cannot replace structured monitoring data because the former are less sensitive to population changes. Thus, unstructured data may not fulfil one of the most critical functions of structured monitoring programmes, namely to act as an early warning system that detects population declines.

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Diversity and Distributions

Tập 22 Số 10

1024-1035

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