The biometrics of Twite<i>Carduelis flavirostris</i>in Ireland and Britain

McLoughlin, Derek; Beaubier, Jessica E.; Sowter, David; Corse, Colin; Raine, André F.; Benson, Chris; Cotton, Don

doi:10.1080/03078698.2012.747644

Cited by 3 publications

(1 citation statement)

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“…We aged birds following standardised EUring codes (Du Feu et al 2020) as either juveniles or adults based on plumage and moult characteristics. However, although we were able to sex some adults on behaviour, genetics or extreme biometrics, most birds could not be sexed on plumage alone at the point of capture due to unreliable sexing criteria, particularly pink rumps indicating male birds (Svenson 1992, McLoughlin et al 2012). Systematic resightings of colour-marked birds at the feeding station were made by two observers every other day from March to October, for intervals of one to three hours at a time.…”

Section: Methodsmentioning

confidence: 99%

Age-specific survival in an English Twite population

Gkourtsouli-Antoniadou

Ewing

Hudson³

et al. 2021

Preprint

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Like many bird species associated with agricultural habitats in the UK, the Twite Linaria flavirostris has undergone severe declines over recent decades due to habitat degradation, with populations in England, Wales and Ireland now restricted to a few small pockets. However, the demographic drivers of these declines are still largely unresolved. We estimated the survival of Twite from a small population at the southernmost edge of the English range in Derbyshire using capture-mark-recapture data from 2016–2019. Annual apparent survival for juveniles (0.14-0.34) was lower than for adults (0.29-0.56) and less than that of other Cardueline finches. Our results suggest that low juvenile survival may be one demographic driver underpinning the recent decline of the Derbyshire Twite population, although we also cannot rule out the possibility that differences in emigration of juveniles and adults from the population also contribute to the observed age-specific apparent survival rates.

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Section: Methodsmentioning

confidence: 99%

Age-specific survival in an English Twite population

Gkourtsouli-Antoniadou

Ewing

Hudson³

et al. 2021

Preprint

View full text Add to dashboard Cite

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Timing, reproduction and biometrics of a long-distance passerine migrant in a core and a peripheral population

Polak,

Bažant

2023

J Ornithol

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Understanding the mechanisms and the factors influencing the phenology, reproduction and biometrics of long-distance migrants are extremely important as global climate warming has induced changes in the locations of geographic ranges and dates of migration and reproduction. In this article, we compare phenology, reproductive parameters and adult biometrics of core and peripheral populations of a rare and endangered bird—the barred warbler Curruca nisoria—that inhabits the farming landscapes and makes long-distance trans-continental migrations. We predicted that: (i) individuals nesting in the core population would be larger than in the peripheral population; (ii) the reproductive parameters of the Barred Warblers in the core population would be higher than in the peripheral population. The Barred Warblers nesting in the centre of the range laid larger clutches and were clearly larger than individuals from the small, peripheral population. However, no differences in egg size and productivity were observed between the analysed populations. The Barred Warblers synchronised their breeding dates over a large geographical area as they had only a short time window for reproduction and had to lay their eggs as soon as possible. Individuals arriving earlier on the breeding grounds had larger clutches, longer wings and produced more nestlings. The pressure of the passage of time during the breeding season was a more important factor than the geographical location affecting the breeding characteristics in these populations.

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