ORCID Profile
0000-0002-1359-5133
Current Organisation
Griffith University
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Publisher: Wiley
Date: 08-05-2014
DOI: 10.1890/130260
Publisher: Wiley
Date: 17-11-2017
DOI: 10.1111/ECOG.02957
Publisher: Informa UK Limited
Date: 05-2013
Publisher: MDPI AG
Date: 09-11-2012
DOI: 10.3390/RS4113417
Publisher: Informa UK Limited
Date: 06-2016
DOI: 10.1071/MU16003
Publisher: Informa UK Limited
Date: 06-2016
DOI: 10.1071/MU15046
Publisher: Wiley
Date: 20-11-2018
DOI: 10.1111/DDI.12675
Publisher: Informa UK Limited
Date: 06-2016
DOI: 10.1071/MU15056
Publisher: Informa UK Limited
Date: 06-2016
DOI: 10.1071/MU15133
Publisher: Springer Science and Business Media LLC
Date: 13-04-2017
DOI: 10.1038/NCOMMS14895
Abstract: Migratory animals are threatened by human-induced global change. However, little is known about how stopover habitat, essential for refuelling during migration, affects the population dynamics of migratory species. Using 20 years of continent-wide citizen science data, we assess population trends of ten shorebird taxa that refuel on Yellow Sea tidal mudflats, a threatened ecosystem that has shrunk by % in recent decades. Seven of the taxa declined at rates of up to 8% per year. Taxa with the greatest reliance on the Yellow Sea as a stopover site showed the greatest declines, whereas those that stop primarily in other regions had slowly declining or stable populations. Decline rate was unaffected by shared evolutionary history among taxa and was not predicted by migration distance, breeding range size, non-breeding location, generation time or body size. These results suggest that changes in stopover habitat can severely limit migratory populations.
Publisher: Wiley
Date: 21-02-2010
Publisher: Elsevier BV
Date: 08-2021
Publisher: Wiley
Date: 20-01-2022
DOI: 10.1111/IBI.13042
Abstract: Population estimates are widely used to underpin conservation decisions. However, determining accurate population estimates for migratory species is especially challenging, as they are often widespread and it is rarely possible to survey them throughout their full distribution. In the East Asian–Australasian Flyway (EAAF), this problem is compounded by its size (85 million square kilometres) and the number of migratory species it supports (nearly 500). Here, we provide analytical approaches for addressing this problem, presenting a revision of the EAAF population estimates for 37 migratory shorebird species protected under Australian national environmental legislation. Population estimates were generated by (1) summarizing existing count data in the non‐breeding range, (2) spatially extrapolating across uncounted areas, and (3) modelling abundance on the basis of estimates of breeding range and density. Expert review was used to adjust modelled estimates, particularly in under‐counted areas. There were many gaps in shorebird monitoring data, necessitating substantial use of extrapolation and expert review, the extent of which varied among species. Spatial extrapolation to under‐counted areas often produced estimates that were much higher than the observed data, and expert review was used to cross‐check and adjust these where necessary. Estimates of population size obtained through analyses of breeding ranges and density indicated that 18 species were poorly represented by counts in the non‐breeding season. It was difficult to determine independently the robustness of these estimates, but these breeding ground estimates were considered the best available data for 10 species that mostly use poorly surveyed freshwater or pelagic habitats in the non‐breeding season. We discuss the rationale and limitations of these approaches to population estimation, and how they could be modified for other applications. Data available for population estimates will vary in quality and extent among species, regions and migration stage, and approaches need to be flexible enough to provide useful information for conservation policy and planning.
Publisher: Informa UK Limited
Date: 16-06-2021
Publisher: Informa UK Limited
Date: 08-02-2021
No related grants have been discovered for Robert Clemens.