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Redalyc.Iris Colour As an Indicator of Age Feature in Female Brazilian

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Redalyc.Iris Colour As an Indicator of Age Feature in Female Brazilian Revista de Biología Tropical ISSN: 0034-7744 [email protected] Universidad de Costa Rica Costa Rica Monnerat Nogueira, Denise; Alves, Maria Alice S. Iris colour as an indicator of age feature in female Brazilian tanagers (Passeriformes: Emberizidae) confirmed by a molecular sexing technique Revista de Biología Tropical, vol. 56, núm. 4, diciembre, 2008, pp. 1629-1633 Universidad de Costa Rica San Pedro de Montes de Oca, Costa Rica Available in: http://www.redalyc.org/articulo.oa?id=44918835006 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative Iris colour as an indicator of age feature in female Brazilian tanagers (Passeriformes: Emberizidae) confirmed by a molecular sexing technique Denise Monnerat Nogueira1 & Maria Alice S. Alves2 1. Programa de Pós-graduação em Biologia, Universidade do Estado do Rio de Janeiro (UERJ). Present address: Faculdade de Veterinária, Universidade Federal Fluminense, Departamento MZO, Rua Vital Brazil Filho, 64, Niterói, Rio de Janeiro, CEP 24230-340, Brasil; [email protected]. 2. Departamento de Ecologia, Universidade do Estado do Rio de Janeiro (UERJ), Rua São Francisco Xavier, 524. Rio de Janeiro, RJ, CEP 20550-011, Brasil; [email protected] Received 02-VII-2007. Corrected 30-VI-2008. Accepted 31-VII-2008. Abstract: The Brazilian tanager, Ramphocelus bresilius is an endemic species from Brazil that is sexually dimorphic in adult plumage. Young males are similar to adult and young females until their second year. Adults and young females are not distinguishable in plumage. We tested whether iris colour can be used to separate adult females from immature females. We used for the first time the molecular sexing technique based on CHD- genes to confirm the sex of the individuals classified as “female plumage with red iris”, and to identify the sex of individuals classified as “female plumage and brown iris”. The adult males were used as a positive control. DNA samples from 190 individuals were analysed. The sizes of the PCR products were identified as 350 base pairs (bp) for CHD-Z and 388 bp for CHD-W. We confirmed that adult females have a red iris and the young females a brown iris. We could also separate young males and females which present the same iris colour and plumage. Although there are indications that the iris colour can be used by birds to identify the adults in co-operative breeding species such as the Brazilian tanager, more behavioural data are required to understand the role of iris coloration in this species. Rev. Biol. Trop. 56 (4): 1629-1633. Epub 2008 December 12. Key words: Molecular sexing, iris colour, CHD-gene, Ramphocelus bresilius, Passeriformes. Adults and particularly juveniles of many distribution extends from Paraíba state in the bird species are monomorphic, making deter- northeast to Santa Catarina in the southeast, mination of sex difficult. It is estimated that thus encompassing almost the whole extent of adult females appear identical to males in over the Atlantic forest. Adult R. bresilius exhibit 50% of the world’s bird species (Griffiths et a pronounced sexual dimorphism, with bright al. 1998). Besides that, the difference between blood red plumage in the males, contrasting males and females for some species is only with black wings, tail and legs. A white cal- recognisable in adults or subadults. In this losity at the base of the jaw is emphasized by case, until the difference in plumage becomes the dark bill. Adult females are greyish-brown evident, the young are usually similar to adult on the back, with scattered reddish feathers females. Thus, morphological differences that dispersed on the rump and upper tail coverts. can be used to easily identify the sex in birds Immature males and females have similar are extremely important to facilitate many plumage to adult females and there is no appar- studies of behaviour, evolutionary ecology and ent plumage difference between adult and evolution (Ellegren 1996). young females (Sick 1997). Adult females and Ramphocelus bresilius, the Brazilian tana- young males can only be distinguished after the ger, is an endemic species in Brazil, whose first year, when young males start to acquire Rev. Biol. Trop. (Int. J. Trop. Biol. ISSN-0034-7744) Vol. 56 (4): 1629-1633, December 2008 1629 the first red feathers. The black and red plum- (22o50’04’’S, 43o51’39”W) and Aventureiro age of the adult male is completed at the second (22o49’28’’S, 43o42’32’’ W) located on the year (Sick 1997). island of Ilha Grande. One hundred and ninety Based on field observations, Castiglioni birds were captured with mist nets (12.0 x 2.0 (1998) suggests that the iris colour can be used m 36 mm mesh) between October 1999 and as a feature to separate adult females from young February 2001. Individuals were individually females. According to the author, the young marked with numbered aluminium leg bands have a brown iris and the adult, a red iris. to identify recaptures. Among the 190 sampled Confirmation of the iris as an age related birds, 78 had male plumage and red iris, 45 had characteristic can help the identification of female plumage and red iris and 67 had female adult females in the field. This could be par- plumage and brown iris. Based on the iris colour ticularly important in population genetic stud- they were classified as: Red iris (Ri) and Brown ies, since the inclusion of young animals in the iris (Bi). The 78 male (M) individuals were analysis could generate too many samples of included in the analysis as a positive control. related individuals (Edwards 1993). Blood was extracted from each individual Sex identification at the DNA level is a captured by puncturing the tarsal vein with well-established technique that has proved to a disposable needle 13 x 4.5 mm (26G1/2) be fast and accurate. In the method described and collecting blood in a capillary tube. by Griffiths et al.(1998), homologous copies Approximately 50-150μl of blood was extract- of the CHD (Chromohelicase-DNA-binding) ed and was immediately placed in a 1.5 ml gene, located on Z and W avian sex chromo- eppendorf tube containing absolute ethanol. somes, are amplified by the polymerase chain Samples were stored at room temperature dur- reaction (PCR) using a single pair of primers ing field work and at 4ºC in the laboratory. P2 and P8 (Griffiths et al. 1996, Griffiths et al. DNA was extracted by using a salting-out 1998). Two different sized PCR products result method (FitzSimmons et al. 1995). All indi- in females, Z and W, but just one in males, viduals were sexed by examining the highly ZZ. This is possible because the primers span conserved W and Z chromosome linked gene, differential intronic sequences (Miyaki et al. CHD-W and CHD-Z (Griffiths et al. 1998). 1998). As the CHD-gene is located on the avian Polymerase chain reaction (PCR) ampli- sex chromosomes of all species (except ratites) fication was achieved in a 10 μL reaction this technique has been widely used. volume containing 10ng DNA, 1x buffer In the present study we used the P2 and P8 (75mM Tris-HCl pH 9.0, 20 mM(NH4)2SO4, primers for the first time on R. bresilius to con- 0.01% Tween 20), 0.25 U Taq DNA poly- firm if the iris colour is an indicator of age. The merase (Thermoprime plus, Advanced molecular sexing technique was also used to Biotechnologies), 200 μM dNTPs (Gibco), identify the gender of the juveniles since there 2mM de MgCl2 and 1μM of each primer P2 is no difference on iris and plumage colour (5’-TCT GCA TCG CTA AAT CCT TT- 3’) and until the first year. P8 (5’-CTC CCA AGG ATG AGR AAY TG- 3’). PCR amplifications were performed in a MATERIALS AND METHODS Hybaid Touchdown thermal cycler (Thermo Hybaid, Ashford, Middlesex, UK). The samples were collected from The PCR profile used was an initial dena- seven sites in Rio de Janeiro state, south- turation at 94°C for 2 min, followed by 40 eastern Brazil: Ariró (22º54’S, 44º20’W), cycles of 94°C for 45s, 50°C for 45s and 72°C Marambaia (23º04’S, 43º58’W), Maricá for 45s, with a final extension period of 72°C (22º57’S, 42º10’W), Massambaba (22º56’S, for 5 min. 42º12’W) located on the mainland and Abraão The PCR products were analysed on a 6% (22º51’35’’S, 43º49’39’’W) Vila Dois Rios acrylamide gel using an ABI PRISM™ 377 1630 Rev. Biol. Trop. (Int. J. Trop. Biol. ISSN-0034-7744) Vol. 56 (4): 1629-1633, December 2008 DNA sequencer and sized with ROX 500 size an extra guarantee against cross species con- marker with bands of known size every 50bp. tamination (Newton and Graham 1994). All gels were analysed using GENESCAN TM All the individuals sexed in the field as red Analysis 2.0, and GENOTYPER TM 1.1 soft- iris with female plumage were confirmed as ware. The primers were labelled with NED dye female by the molecular sexing technique. Sex emitting a yellow fluorescence when read by was also confirmed in 100% of the adult males the laser in the automated sequencer. used as a positive control, sexed according to plumage and iris colour. The results of the molecular sexing technique confirmed the field RESULTS observations performed by Castiglioni (1998) The molecular sexing technique was effi- according to the relation of the iris color to age cient for R.
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