Conditions on the Non-Breeding Areas Affect Primary Moult Strategy of the Curlew Sandpiper<i>Calidris ferruginea</i>

Barshep, Yahkat; Underhill, Les G.; Balachandran, S; Pearson, David

doi:10.5253/078.101.0114

Cited by 11 publications

(14 citation statements)

References 31 publications

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“…This result is corroborated by several studies on both migrant and resident birds where birds fail to molt when the resources are low (Freed and Cann , Barshep et al. , b, but see Boone et al. ).…”

Section: Discussionsupporting

confidence: 68%

Winter conditions influence biological responses of migrating hummingbirds

et al. 2016

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Abstract. Conserving biological diversity given ongoing environmental changes requires the knowledge of how organisms respond biologically to these changes; however, we rarely have this information. This data deficiency can be addressed with coordinated monitoring programs that provide field data across temporal and spatial scales and with process-based models, which provide a method for predicting how species, in particular migrating species that face different conditions across their range, will respond to climate change. We evaluate whether environmental conditions in the wintering grounds of broad-tailed hummingbirds influence physiological and behavioral attributes of their migration. To quantify winter ground conditions, we used operative temperature as a proxy for physiological constraint, and precipitation and the normalized difference vegetation index (NDVI) as surrogates of resource availability. We measured four biological response variables: molt stage, timing of arrival at stopover sites, body mass, and fat. Consistent with our predictions, we found that birds migrating north were in earlier stages of molt and arrived at stopover sites later when NDVI was low. These results indicate that wintering conditions impact the timing and condition of birds as they migrate north. In addition, our results suggest that biologically informed environmental surrogates provide a valuable tool for predicting how climate variability across years influences the animal populations.

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Section: Discussionsupporting

confidence: 68%

Winter conditions influence biological responses of migrating hummingbirds

et al. 2016

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“…The initial predictive cue -seasonality -may be supplemented with additional external signs e.g. snow cover (Marmillot et al, 2016), temperature (Barshep et al, 2013a) and rainfall pattern (Barshep et al, 2013b). It allows fine-tuning of moult timing to local, and year-specific, conditions.…”

Section: Discussionmentioning

confidence: 99%

“…in tropics, birds may respond to low light intensity as a predictive cue for rainfall (Gwinner & Scheuerlein, 1998). The pattern of the timing of moult coinciding with rainfall periods is, perhaps, an adaptation to carry out this energy-demanding activity during periods of food abundance (Barshep et al, 2013b). Energetic cost of moult may represent up to 20% of the daily energy expenditure (Murphy & King, 2007).…”

Section: Introductionmentioning

confidence: 99%

Seasonality, diet, and physiology as a predominant control factors of the moult dynamics in birds – a meta-analysis

Drobniak¹,

Gudowska²

2020

Preprint

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Moult is a process, usually occurring annually, in which birds replace their plumage. It is one of the most crucial life-history traits because it restores the functions of plumage and allows a bird to adapt to environmental conditions or special seasonal needs such as breeding and camouflage during non-breeding season. Consequently, moulting has advantages in terms of future performance. However, it also has immediate costs related to producing protein-rich tissue, reduced thermoregulation and flight performance. Expression of such costs may depend on a wide array of physiological and environmental factors experienced by an individual. Considering a variety of factors affecting moult dynamics in single studies, we use a systematic meta-analytical approach to summarise existing evidence and look for general patterns in how moult depends on both extrinsic (environment, ecological variability) and intrinsic (physiology, energy reserves, life stage) factors.

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“…Juvenile feathers, which are of poorer quality than adults', abrade faster under harsh tropical sun and thus might need to be replaced in the supplemental moult (Pearson 1974, Prater 1981, Howell 2010. For instance, Terek Sandpipers Xenus cinereus conduct supplemental moult at the coast, Curlew Sandpipers C. ferruginea at inland and coastal habitats, and Ruffs Philomachus pugnax and Wood Sandpipers at inland wetlands, in Africa and Australia (Schmitt & Whitehouse 1976, Barshep et al 2013. For instance, Terek Sandpipers Xenus cinereus conduct supplemental moult at the coast, Curlew Sandpipers C. ferruginea at inland and coastal habitats, and Ruffs Philomachus pugnax and Wood Sandpipers at inland wetlands, in Africa and Australia (Schmitt & Whitehouse 1976, Barshep et al 2013.…”

Section: Different Moult Patterns In Adult and Immature Wood Sandpipersmentioning

confidence: 99%

Age‐specific variation in relationship between moult and pre‐migratory fuelling in Wood SandpipersTringa glareolain southern Africa

Remisiewicz

Tree²,

Underhill

et al. 2016

Ibis

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Trans‐equatorial avian migrants tend to breed, moult and migrate – the main energy‐requiring events in their lifecycle – at different times. Little is known about the relationship between wing moult and pre‐migratory fuelling in waders on their non‐breeding grounds, where time is less constrained than during their brief high‐latitude breeding season. We determined age‐related strategies of Wood Sandpipers Tringa glareola to balance the energetic demands of primary moult against pre‐migratory fuelling in southern Africa by analysing body mass and primary moult at first capture of 1721 birds mist‐netted in 1972–96 at waterbodies in Zimbabwe. Adults moulted all their primaries in August–December, but immatures underwent a supplemental moult of varying numbers of outer primaries in December–April, close to departure. We used locally weighted linear regression to estimate trends in Wood Sandpiper body mass from 1 July to 1 May. They maintained low mass from arrival in July–September to February–early March. Adults fuelled from 10 February to 1 May at a mean rate of 0.25 g/day (sd = 0.16). Most adults (98%) began fuelling 10–75 days after completing primary moult. Immatures fuelled from 4 March to 13 April at 0.24 g/day (sd = 0.14). They used varying strategies depending on their condition: a brief gap between moult and fuelling; an overlap of these processes near departure, leading to slower fuelling; or skipping fuelling altogether and staying in southern Africa for a ‘gap year’. Immatures moulting three or five outer primaries fuelled more slowly than post‐moult birds. Immatures moulting four outer primaries started fuelling 3 weeks later but at a higher rate than did post‐moult birds of this group. In post‐moult immatures, the later they ended moult, the later and faster they fuelled. The heaviest adults and immatures using all moult patterns accumulated fuel loads of c. 50% of lean body mass, and could potentially cross 2397–4490 km to reach the Great Rift Valley in one non‐stop flight. Immatures were more flexible in the timing and extent of moult and in the timing and rate of fuelling than adults. This flexibility enables inexperienced Wood Sandpipers to cope with inter‐annual differences in feeding conditions at Africa's ephemeral inland waterbodies.

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Conditions on the Non-Breeding Areas Affect Primary Moult Strategy of the Curlew SandpiperCalidris ferruginea

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Cited by 11 publications

References 31 publications

Winter conditions influence biological responses of migrating hummingbirds

Winter conditions influence biological responses of migrating hummingbirds

Seasonality, diet, and physiology as a predominant control factors of the moult dynamics in birds – a meta-analysis

Age‐specific variation in relationship between moult and pre‐migratory fuelling in Wood SandpipersTringa glareolain southern Africa

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