Sexing Black‐legged Kittiwakes by measurement

Coulson, J. C.

doi:10.1080/03078698.2009.9674397

Cited by 13 publications

(17 citation statements)

References 8 publications

(12 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although males were heavier than females, body mass was too variable for use in morphometric sexing. This is consistent with other studies showing that weight is a poor indicator of sex due to significant diurnal, seasonal, and interannual weight changes (Craig et al 1980, Coulson 2009). Shield parameters also were too variable despite their small measurement error (r ¼ 0.99).…”

Section: Discussionsupporting

confidence: 82%

“…Head length is an easy and highly repeatable measurement, with clear physical landmarks, producing smaller measurement error than for other hard skeletal measures like bill, tarsus or foot (Sweeney & Tatner 1996, Coulson 2009). For use in the field, morphometric sexing using a single feature is optimal provided it is sufficiently accurate (Coulson 2009). Although accuracy of a discriminant function typically increases when more variables are added (Dechaume-Moncharmont et al 2011), accuracy of sexing Gough Moorhens was not improved by adding further variables.…”

Section: Discussionmentioning

confidence: 99%

“…This is better than the accuracy of morphometric sexing for a number of other rail species (Craig et al 1980, Eason et al 2001 et al 2010). Although head length is not widely used for avian sexing, it has been utilised in wrens and gulls (Sweeney & Tatner 1996, Coulson 2009). Head length is an easy and highly repeatable measurement, with clear physical landmarks, producing smaller measurement error than for other hard skeletal measures like bill, tarsus or foot (Sweeney & Tatner 1996, Coulson 2009).…”

Section: Discussionmentioning

confidence: 99%

“…Although head length is not widely used for avian sexing, it has been utilised in wrens and gulls (Sweeney & Tatner 1996, Coulson 2009). Head length is an easy and highly repeatable measurement, with clear physical landmarks, producing smaller measurement error than for other hard skeletal measures like bill, tarsus or foot (Sweeney & Tatner 1996, Coulson 2009). For use in the field, morphometric sexing using a single feature is optimal provided it is sufficiently accurate (Coulson 2009).…”

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Morphometric and genetic sexing in the Gough MoorhenGallinula comeri

Parker

Rexer-Huber

Parker

et al. 2012

Ringing & Migration

View full text Add to dashboard Cite

To develop an accurate, low-cost method for sexing Gough Moorhens Gallinula comeri using morphometric measurements, twelve measurements were taken from 59 birds and validated against genetic sexing. The classification accuracy of variables was determined and discriminant analysis was used to test whether multiple variables improved accuracy. Males were larger than females in all dimensions. Head length reliably differentiated male and female Gough Moorhens. A threshold of 64 mm correctly classified 92% of the sample birds; adding other variables did not improve accuracy. Gough Moorhens can be sexed with an acceptable level of accuracy using a single morphometric variable, but genetic sexing is needed to confirm the sex of individuals that fall within the overlap zone (62-66 mm).

show abstract

Section: Discussionsupporting

confidence: 82%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Morphometric and genetic sexing in the Gough MoorhenGallinula comeri

Parker

Rexer-Huber

Parker

et al. 2012

Ringing & Migration

View full text Add to dashboard Cite

show abstract

“…Measurements were taken in accordance with instructions in the current BTO Ringers' Manual (Redfern & Clark 2001). Total head length was used to identify the sex of each bird caught according to criteria revised from Baker (1993) by Coulson (2009). In accordance with those revised criteria, birds with a total head length of 90-91 mm were recorded as of indeterminate sex.…”

Section: Biometric Datamentioning

confidence: 99%

Long-term monitoring of a colony of Black-legged Kittiwakes Rissa tridactyla in Scotland

Coleman¹,

Coleman

Rickeard³

et al. 2011

Ringing & Migration

View full text Add to dashboard Cite

Fine-scale spatial segregation in a pelagic seabird driven by differential use of tidewater glacier fronts

Bertrand

Bêty

Yoccoz

et al. 2021

Sci Rep

View full text Add to dashboard Cite

In colonially breeding marine predators, individual movements and colonial segregation are influenced by seascape characteristics. Tidewater glacier fronts are important features of the Arctic seascape and are often described as foraging hotspots. Albeit their documented importance for wildlife, little is known about their structuring effect on Arctic predator movements and space use. In this study, we tested the hypothesis that tidewater glacier fronts can influence marine bird foraging patterns and drive spatial segregation among adjacent colonies. We analysed movements of black-legged kittiwakes (Rissa tridactyla) in a glacial fjord by tracking breeding individuals from five colonies. Although breeding kittiwakes were observed to travel up to ca. 280 km from the colony, individuals were more likely to use glacier fronts located closer to their colony and rarely used glacier fronts located farther away than 18 km. Such variation in the use of glacier fronts created fine-scale spatial segregation among the four closest (ca. 7 km distance on average) kittiwake colonies. Overall, our results support the hypothesis that spatially predictable foraging patches like glacier fronts can have strong structuring effects on predator movements and can modulate the magnitude of intercolonial spatial segregation in central-place foragers.

show abstract

Sexing Black‐legged Kittiwakes by measurement

Cited by 13 publications

References 8 publications

Morphometric and genetic sexing in the Gough MoorhenGallinula comeri

Morphometric and genetic sexing in the Gough MoorhenGallinula comeri

Long-term monitoring of a colony of Black-legged Kittiwakes Rissa tridactyla in Scotland

Fine-scale spatial segregation in a pelagic seabird driven by differential use of tidewater glacier fronts

Contact Info

Product

Resources

About