Complex postbreeding molt strategies in a songbird migrating along the East Asian Flyway, the Pallas’s Grasshopper Warbler<i>Locustella certhiola</i>

Eilts, Hans-Jürgen; Feuerbach, Nele; Round, Philip D.; Bourski, O. V.; Allcock, John A; Leader, Paul J.; Davaasuren, Batmunkh; Erdenechimeg, Tuvshinjargal; Park, Jong‐Gil; Heim, Wieland

doi:10.1002/ece3.7098

Cited by 9 publications

(5 citation statements)

References 61 publications

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“…Many species separate prealternate molt from migration, presumably to reduce potential energetic tradeoffs (Voelker and Rohwer, 1998;Danner et al, 2015). The clear overlap between the prealternate molt and the recorded periods of movement in goldfinches may drive lower fat reserves during the migratory period, as it does in Rusty blackbirds (Euphagus carolinus) and Pallas's grasshopper warblers (Locustella certhiola) that exhibit variable molt and migration patterns and do not always avoid overlap (Wright et al, 2018;Eilts et al, 2021). However, the late breeding season in American goldfinches may also allow for a longer, slower prealternate molt (Middleton, 1977), which may reduce the costs of molt-migration overlap.…”

Section: Discussionmentioning

confidence: 99%

Seasonal Patterns of Fat Deposits in Relation to Migratory Strategy in Facultative Migrants

et al. 2021

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Physiological preparations for migration generally reflect migratory strategy. Migrant birds fuel long-distance flight primarily with lipids, but carrying excess fuel is costly; thus, the amount of fat deposited prior to departure often reflects the anticipated flight duration or distance between refueling bouts. Seasonal pre-migratory deposition of fat is well documented in regular seasonal migrants, but is less described for more facultative species. We analyze fat deposits of free-living birds across several taxa of facultative migrants in the songbird subfamily Carduelinae, including house finches (Haemorhous mexicanus), American goldfinches (Spinus tristis), pine siskins (Spinus pinus) and four different North American ecotypes of red crossbills (Loxia curvirostra), to evaluate seasonal fat deposition during facultative migratory periods. Our data suggest that the extent of seasonal fat deposits corresponds with migratory tendency in these facultative taxa. Specifically, nomadic red crossbills with a seasonally predictable annual movement demonstrated relatively large seasonal fat deposits coincident with the migratory periods. In contrast, pine siskins, thought to be more variable in timing and initiation of nomadic movements, had smaller peaks in fat deposits during the migratory season, and the partial migrant American goldfinch and the resident house finch showed no peaks coincident with migratory periods. Within the red crossbills, those ecotypes that are closely associated with pine habitats showed larger peaks in fat deposits coincident with autumn migratory periods and had higher wing loading, whereas those ecotypes associated with spruces, Douglas-fir and hemlocks showed larger peaks coincident with spring migratory periods and lower wing loading. We conclude that population averages of fat deposits do reflect facultative migration strategies in these species, as well as the winter thermogenic challenges at the study locations. A difference in seasonal fattening and wing loading among red crossbill ecotypes is consistent with the possibility that they differ in their migratory biology, and we discuss these differences in light of crossbill reproductive schedules and phenologies of different conifer species.

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Section: Discussionmentioning

confidence: 99%

Seasonal Patterns of Fat Deposits in Relation to Migratory Strategy in Facultative Migrants

et al. 2021

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“…It was expected that the bird from the Amur region might start its autumn migration later, given that its breeding site is situated further south and closer to the nonbreeding grounds. Furthermore, southern breeding populations of Pallas's Grasshopper‐warblers are known to undergo postbreeding molt on the breeding sites to a larger extent than their northern conspecifics (Eilts et al, 2021 ), which could also delay their migration.…”

Section: Discussionmentioning

confidence: 99%

Autumn migration tracks of Helopsaltes grasshopper‐warblers from Northeast Asia support recent taxonomic assignments

Sleptsov

Ktitorov

Round

et al. 2023

Ecology and Evolution

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Until recently, the migration strategies of small landbird species of the East Asian flyway were relatively poorly studied in comparison with those of the European-African and the American flyways (McKinnon & Love, 2018). This changed considerably during the last decade following the development of tracking techniques based on light levels (see Yong et al., 2021 for review). Tracking studies of East Asian landbirds showed that while a few species of small-and medium-sized species undertake direct sea crossings (Koike et al., 2016) most generally avoid prolonged marine transits, performing detours around water barriers even when they start

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“…Open questions remain regarding the moult schedule of the Arctic Warbler, which is believed to conduct both a post-breeding and pre-breeding moult in various extent (Snyder 2008;Norevik et al 2020). Our tracked individual likely suspended its pre-breeding moult (it was re-captured while moulting tertials 12-15 July 2019 at the breeding site) and continued moulting at one or several of the non-breeding sites, using a similar strategy as described for Pallas´s Grasshopper-warblers Helopsaltes certhiola breeding in Siberia (Eilts et al 2021). Another possibility is a pre-breeding moult during the long stay in Mongolia, which would explain why Arctic Warblers arrive with very fresh plumage at their Siberian breeding sites (O. Bourski, pers.…”

Section: )mentioning

confidence: 99%

From Siberia to Indonesia: tracking the migration of the Arctic Warbler Phylloscopus borealis

Heim,

Bourski,

Shchemeleva

et al. 2023

Preprint

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Little is known regarding the migration routes of songbird populations breeding in Siberia. Here we provide the first geolocator tracking data for an Arctic Warbler breeding in Central Siberia and compare its movements with eight long-distance ring recoveries of this species. In autumn, the tracked individual migrated eastward to a stopover site in eastern Siberia, before migrating southward through Taiwan to its non-breeding sites in the Philippines and Indonesia. During spring migration, the bird spent at least one month at stopover sites in Mongolia, before migrating to its breeding site in June. Ring recovery data confirmed the movement between the Central Siberian breeding grounds and stopover sites in northern Mongolia.

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Complex postbreeding molt strategies in a songbird migrating along the East Asian Flyway, the Pallas’s Grasshopper WarblerLocustella certhiola

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 9 publications

References 61 publications

Seasonal Patterns of Fat Deposits in Relation to Migratory Strategy in Facultative Migrants

Seasonal Patterns of Fat Deposits in Relation to Migratory Strategy in Facultative Migrants

Autumn migration tracks of Helopsaltes grasshopper‐warblers from Northeast Asia support recent taxonomic assignments

From Siberia to Indonesia: tracking the migration of the Arctic Warbler Phylloscopus borealis

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