Sexual Dimorphism in Breast Stripe Width and Beak Eco-Morphology in Himalayan Green-Backed Tits ( Parus Monticolus )

Abstract

Quantitative field data on sexual dimorphism is scant for most bird species. In this first field study of a western Himalayan population of Green-backed Tits (Parus monticolus), we demonstrate that breast stripe width is a dimorphic trait that is a reliable measure to sex this species in the wild. Based on our ability to sex the birds in hand, we describe the sexual dimorphism in eco-morphological variables in our study population. Sexual dimorphism in beak morphology changed from winter to summer due to males having shorter beaks (4.5%) in summer; however, there was little change in female beak measurements. Our study on this Himalayan congener of a widely studied European species can be used to inform studies of the evolutionary ecology of morphological traits in closely-related species inhabiting vastly different habitats.

Keywords

beak length breast stripe Green-backed Tit Himalayas sexual dimorphism

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References

Dhondt

A.A.

(2012) Interspecific competition in birds. Oxford University Press, Oxford.

Dhondt

, Eyckerman

and Hublé

(1979) Will Great Tits become little tits. Biol. J. Linn. Soc., 11, 289–294.

Figuerola

and Senar

J.C.

(2000) Measurement of plumage badges: an evaluation of methods used in the Great Tit Parus major. Ibis, 142, 482–484.

Gosler

(1987a) Pattern and process in the bill morphology of the Great Tit Parus major. Ibis, 129, 451–476.

Gosler

(1987b) Sexual dimorphism in the summer bill length of the Great Tit. Ardea, 75, 91–98.

Gosler

and Clement

(2016) Green-backed Tit (Parus monticolus). http://www.hbw.com/species/Green-backed-Tit-parus-monticolus [accessed 11 October 2016].

Griffiths

, Double

M.C.

, Orr

and Dawson

R.J.

(1998) A DNA test to sex most birds. Mol. Ecol., 7, 1071–1075.

Hofmann

, Lo

W.S.

, Yao

C.T.

and Li

S.H.

(2007) Cryptic sexual dichromatism occurs across multiple types of plumage in the Green-backed Tit (Parus monticolus). Ibis, 149, 264–270.

Järvi

and Bakken

(1984) The function of the variation in the breast stripe of the Great Tit (Parus major). Anim. Behav., 32, 590–596.

10.

Johansson

U.S.

, Ekman

, Bowie

R.C.

, Halvarsson

, Ohlson

J.I.

, Price

T.D.

and Ericson

P.G.

(2013) A complete multilocus species phylogeny of the tits and chickadees (Aves: Paridae). Mol. Phylogenet. Evol., 69, 852–860.

11.

Matthysen

, Dhondt

and Adriaensen

(1991) Sexual dimorphism in bill length and breeding success in Great and Blue Tits (Parus major, P. caeruleus). Ornis Scand., 22, 171–173.

12.

Owens

I.P.

and Hartley

I.R.

(1998) Sexual dimorphism in birds: why are there so many different forms of dimorphism? Proc. R. Soc. Lond. B, 265, 397–407.

13.

Quesada

and Senar

J.C.

(2007) The role of melanin-and carotenoid-based plumage coloration in nest defense in the Great Tit. Ethology, 113, 640–647.

14.

R Development Core Team (2015) R: a language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria.

15.

Remeš

and Matysiokova

(2013) More ornamented females produce higher-quality offspring in a socially monogamous bird: an experimental study in the Great Tit (Parus major). Front. Zool., 10, 14.

16.

Senar

J.C.

, Conroy

M.J.

, Quesada

and Mateos-Gonzalez

(2014) Selection based on the size of the black tie of the Great Tit may be reversed in urban habitats. Ecol. Evol., 4, 2625–2632.

17.

Senar

J.C.

, Figuerola

and Domènech

(2003) Plumage coloration and nutritional condition in the Great Tit Parus major: the roles of carotenoids and melanins differ. Naturwissenschaften, 90, 234–237.

18.

Slagsvold

(1993) Sex recognition and breast stripe size in Great Tits. Ardea, 81, 35–41.