Fluctuación anual de la masa corporal, tamaño de gónadas y muda de Guira guira (Aves Cuculiformes: Cuculidae)
The relationships between body mass, gonadal size and postnuptial molt of Guira Cuckoo Guira guira are described based on 92 specimens (53 males and 39 females), collected in Magdalena district (Buenos Aires province) during an annual period from 1991 to 1997. Considering the yearly average, no significant differences were found between body mass of males and females. Two periods in variation in the size of the gonads for each sex were determined: one of increased activity (September-January) and the other of sexual inactivity (April-August). Males showed an earlier gonadal development than females. The first egg laying began in October. In mid-December, a decline in the size of the gonads in relation to the onset of postnuptial molt began and peaked in March. The molt was asymmetric; 85,8 % of the studied specimens were in molt. The process was extended through May.
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Fundación Miguel Lillo
2010
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rev-actazoologica-ar-article-3122019-03-22T16:38:48Z Fluctuación anual de la masa corporal, tamaño de gónadas y muda de Guira guira (Aves Cuculiformes: Cuculidae) Darrieu, Carlos A. Camperi, Aníbal R. Montalti, Diego Muda masa corporal gónadas Guira guira Molt body mass gonads Guira guira The relationships between body mass, gonadal size and postnuptial molt of Guira Cuckoo Guira guira are described based on 92 specimens (53 males and 39 females), collected in Magdalena district (Buenos Aires province) during an annual period from 1991 to 1997. Considering the yearly average, no significant differences were found between body mass of males and females. Two periods in variation in the size of the gonads for each sex were determined: one of increased activity (September-January) and the other of sexual inactivity (April-August). Males showed an earlier gonadal development than females. The first egg laying began in October. In mid-December, a decline in the size of the gonads in relation to the onset of postnuptial molt began and peaked in March. The molt was asymmetric; 85,8 % of the studied specimens were in molt. The process was extended through May. Se describen las relaciones entre masa corporal, tamaño de gónadas y muda postnupcial del Pirincho Guira guira sobre la base de 92 especímenes (53 machos y 39 hembras), coleccionados en el partido de Magdalena (provincia de Buenos Aires) entre 1991 y 1997, hasta completar el período de un año. Considerando el promedio anual, no se hallaron diferencias significativas entre la masa corporal de machos y hembras. Para cada sexo se determinaron dos períodos en la variación del tamaño de las gónadas: uno de mayor actividad (septiembre-enero) y el otro de inactividad sexual (abril-agosto). Los machos mostraron un desarrollo gonadal más temprano que las hembras. La postura del primer huevo comenzó en octubre. A mediados de diciembre comenzó una declinación en el tamaño de las gónadas, en relación con el comienzo de la muda postnupcial, que alcanzó su apogeo en marzo. La muda fue asimétrica. El 85,8% de los ejemplares estudiados estaban en muda. El proceso se extendió hasta fines de mayo. Fundación Miguel Lillo 2010-12-16 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://www.lillo.org.ar/journals/index.php/acta-zoologica-lilloana/article/view/312 Acta Zoológica Lilloana; Acta Zoológica Lilloana 54 (1-2) (2010); 161-165 Acta Zoológica Lilloana; Acta Zoológica Lilloana 54 (1-2) (2010); 161-165 Acta Zoológica Lilloana; Acta Zoológica Lilloana 54 (1-2) (2010); 161-165 1852-6098 spa http://www.lillo.org.ar/journals/index.php/acta-zoologica-lilloana/article/view/312/347 |
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Biblioteca de la Fundación Miguel Lillo de AR |
| language |
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Digital |
| author |
Darrieu, Carlos A. Camperi, Aníbal R. Montalti, Diego |
| spellingShingle |
Darrieu, Carlos A. Camperi, Aníbal R. Montalti, Diego Fluctuación anual de la masa corporal, tamaño de gónadas y muda de Guira guira (Aves Cuculiformes: Cuculidae) |
| author_facet |
Darrieu, Carlos A. Camperi, Aníbal R. Montalti, Diego |
| author_sort |
Darrieu, Carlos A. |
| title |
Fluctuación anual de la masa corporal, tamaño de gónadas y muda de Guira guira (Aves Cuculiformes: Cuculidae) |
| title_short |
Fluctuación anual de la masa corporal, tamaño de gónadas y muda de Guira guira (Aves Cuculiformes: Cuculidae) |
| title_full |
Fluctuación anual de la masa corporal, tamaño de gónadas y muda de Guira guira (Aves Cuculiformes: Cuculidae) |
| title_fullStr |
Fluctuación anual de la masa corporal, tamaño de gónadas y muda de Guira guira (Aves Cuculiformes: Cuculidae) |
| title_full_unstemmed |
Fluctuación anual de la masa corporal, tamaño de gónadas y muda de Guira guira (Aves Cuculiformes: Cuculidae) |
| title_sort |
fluctuación anual de la masa corporal, tamaño de gónadas y muda de guira guira (aves cuculiformes: cuculidae) |
| description |
The relationships between body mass, gonadal size and postnuptial molt of Guira Cuckoo Guira guira are described based on 92 specimens (53 males and 39 females), collected in Magdalena district (Buenos Aires province) during an annual period from 1991 to 1997. Considering the yearly average, no significant differences were found between body mass of males and females. Two periods in variation in the size of the gonads for each sex were determined: one of increased activity (September-January) and the other of sexual inactivity (April-August). Males showed an earlier gonadal development than females. The first egg laying began in October. In mid-December, a decline in the size of the gonads in relation to the onset of postnuptial molt began and peaked in March. The molt was asymmetric; 85,8 % of the studied specimens were in molt. The process was extended through May. |
| publisher |
Fundación Miguel Lillo |
| publishDate |
2010 |
| url |
http://www.lillo.org.ar/journals/index.php/acta-zoologica-lilloana/article/view/312 |
| work_keys_str_mv |
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| _version_ |
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