Linking population trends to species’ traits is informative for the detection of the most important threatening factors and for assessing the effectiveness of conservation measures. Although some previous studies performed such an analysis at local to continental scales, the global-scale focus is the most relevant for conservation of the entire species. Here we evaluate information on global population trends of shorebirds, a widely distributed and ecologically diversified group, where some species connect different parts of the world by migration, while others are residents. Nowadays, shorebirds face rapid environmental changes caused by various human activities and climate change. Numerous signs of regional population declines have been recently reported in response to these threats. The aim of our study was to test whether breeding and non-breeding habitats, migratory behaviour (migrants vs. residents) and migration distance, breeding latitude, generation time and breeding range size mirror species’ global population trends. We found that a majority of shorebird species have declined globally. After accounting for the influence of traits and species taxonomy, linear mixed-effects models showed that populations of migratory shorebirds decreased more than populations of residents. Besides that, declines were more frequent for species breeding at high latitudes of the Northern Hemisphere, but these patterns did not hold after excluding the non-migratory species. Our findings suggest that factors linked to migration, such as habitat loss as well as deterioration at stop-over or wintering sites and a pronounced climate change impact at high latitudes, are possible drivers of the observed worldwide population decreases.
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We wish to thank M. Maticova for her help with the data collection and R. Fuller and many anonymous reviewers for their constructive comments.
R code is accessible in Online Resource 1.
J.K. and J.R. were supported by the Czech Science Foundation (20-00648S) and by the Charles University (PRIMUS/17/SCI/16). J.K. and J.H. were supported by the UNCE program (UNCE/SCI/005). M.Š. and V.K. were supported by the Ministry of Education, Youth and Sports of the Czech Republic MSMT CR (LH13278 and CZ.02.2.69/0.0/0.0/19_074/0014459), and V.K. was supported by ÉLVONAL-KKP 126949 of the Hungarian government.
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Koleček, J., Reif, J., Šálek, M. et al. Global population trends in shorebirds: migratory behaviour makes species at risk. Sci Nat 108, 9 (2021). https://doi.org/10.1007/s00114-021-01717-1
- Climate change
- Habitat deterioration
- Life history strategy
- Migration flyway