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.2023 Mar 23;13(3):e9932.
doi: 10.1002/ece3.9932. eCollection 2023 Mar.

Autumn migration tracks ofHelopsaltes grasshopper-warblers from Northeast Asia support recent taxonomic assignments

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Autumn migration tracks ofHelopsaltes grasshopper-warblers from Northeast Asia support recent taxonomic assignments

Yuri Sleptsov et al. Ecol Evol..

Abstract

Migration strategies are genetically inherited in most songbirds, and closely related species can exhibit markedly contrasting migration programs. Here, we investigate the autumn migration of oneHelopsaltes grasshopper-warbler from a population near Magadan, North East Russia, based on light-level geolocation. Although often considered to belong to Middendorff's Grasshopper-warblerH. ochotensis, recent genetic studies suggest that birds from this population are more closely related to Pallas's Grasshopper-warblerH. certhiola. We compare the migratory behavior of the Magadan bird with two Pallas's Grasshopper-warblers tracked from populations in the Kolyma River valley and the Amur region, Russia. We found similar migration patterns in all three tracked individuals, with stopover sites in eastern China and wintering sites in mainland Southeast Asia, within the known range for Pallas's Grasshopper-warbler. Furthermore, based on morphological data compiled during bird ringing, we were able to confirm the presence of potential "Magadan grasshopper-warblers" during spring and autumn migration in Thailand. Our scant data provide further evidence that MagadanHelopsaltes, notwithstanding their morphological resemblance to Middendorff's Grasshopper-warbler, constitute a population of Pallas's Grasshopper-warbler.

Keywords: East Asian flyway; Helopsaltes certhiola; Helopsaltes ochotensis; Locustella; geolocation; subcerthiola.

© 2023 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.

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Figures

FIGURE 1
FIGURE 1
Stationary positions (plus standard deviation) during autumn migration and the boreal winter of tracked grasshopper‐warblers, based on light‐level geolocation data, in relation to the distribution ranges of Pallas's and Middendorff's Grasshopper‐warblers (data from IUCN, 2023) and hybrid populations. The inset shows (from top to bottom) a “Magadan grasshopper‐warbler,” a Pallas's Grasshopper‐warbler from the Kolyma River and a Pallas's Grasshopper‐warbler from the upper Amur River valley, fitted with geolocators.
FIGURE 2
FIGURE 2
Presumed “Magadan grasshopper‐warbler” trapped on northward passage in Thailand on May 15, 2011 (left), and a grasshopper‐warbler from the breeding area in Magadan, Russia on June 18, 2014 (right). Both individuals exhibit similar identification features: obscure dorsal streaking, including on the upper‐tail coverts, and unstreaked rump. Photographs by Philip D. Round and Yury Sleptsov.
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References

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