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Abstract:

Timing of breeding to an optimal season is a requirement for a successful reproductive outcome in seasonally breeding species. Photoperiodic signals are capable of modifying the reproductive behaviour and reproductive systems in several vertebrate species. The cichlid fish Cichlasoma dimerus shows highly organized breeding activities and different social status. The aim of this study is to test whether C. dimerus reproductive behaviour (male aggressive behaviour and female choice) and reproductive physiology (GnRH3 morphometric parameters, pituitary hormones content and organ-somatic indexes) are modulated by photoperiod. Before spawning, dominant pairs were isolated and kept in opposite tanks of 20 l for one week, so they could see each other but not physically interact. Afterwards, a group was exposed for four weeks to a short photoperiod (8 h light:16 h dark) (short photoperiod exposed animals: SP) while another group was exposed to a long photoperiod (14 h light:10 h dark) (long photoperiod exposed animals: LP). Temperature was maintained constant. Behavioural experiments showed that male aggression related to territory selection and its defence is reduced in SP males. Further, SP females were never chosen. At the brain level we demonstrated that GnRH3 neuronal optical density of staining was reduced. Finally, at the pituitary level we showed that SP males showed low levels of β-LH, PRL and GH in the pituitary, and that SP females showed no significant differences in the pituitary content of any hormone. Taken all together these results suggest that in C. dimerus the photoperiod is a relevant environmental cue related to reproductive behaviour and physiology. © 2009 Elsevier Inc. All rights reserved.

Registro:

Documento: Artículo
Título:Photoperiodic modulation of reproductive physiology and behaviour in the cichlid fish Cichlasoma dimerus
Autor:Fiszbein, A.; Cánepa, M.; Vázquez, G.R.; Maggese, C.; Pandolfi, M.
Filiación:Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
Palabras clave:GnRH; Gonadotropins; Growth hormone; Pituitary; Prolactin; Somatolactin; gonadorelin; hypophysis hormone; aggression; animal cell; animal experiment; animal tissue; article; breeding; cichlid; controlled study; female; genital system; light dark cycle; male; mate choice; morphometrics; nonhuman; photoperiodicity; priority journal; reproduction; season; sexual behavior; social status; spawning; temperature; Analysis of Variance; Animals; Brain; Choice Behavior; Cichlids; Female; Fish Proteins; Glycoproteins; Gonadotropin-Releasing Hormone; Hematocrit; Humans; Hypothalamo-Hypophyseal System; Intercellular Signaling Peptides and Proteins; Male; Neurons; Photoperiod; Pituitary Hormones; Pituitary-Adrenal System; Prolactin; Pyrrolidonecarboxylic Acid; Reproductive Physiological Phenomena; Sexual Behavior, Animal
Año:2010
Volumen:99
Número:4
Página de inicio:425
Página de fin:432
DOI: http://dx.doi.org/10.1016/j.physbeh.2009.11.017
Título revista:Physiology and Behavior
Título revista abreviado:Physiol. Behav.
ISSN:00319384
CODEN:PHBHA
CAS:gonadorelin, 33515-09-2, 9034-40-6; hypophysis hormone, 85883-81-4; Fish Proteins; Glycoproteins; Gonadotropin-Releasing Hormone, 33515-09-2; Intercellular Signaling Peptides and Proteins; Pituitary Hormones; Prolactin, 9002-62-4; Pyrrolidonecarboxylic Acid, 98-79-3; gonadotropin-releasing hormone-III; somatolactin protein, fish
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00319384_v99_n4_p425_Fiszbein

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Citas:

---------- APA ----------
Fiszbein, A., Cánepa, M., Vázquez, G.R., Maggese, C. & Pandolfi, M. (2010) . Photoperiodic modulation of reproductive physiology and behaviour in the cichlid fish Cichlasoma dimerus. Physiology and Behavior, 99(4), 425-432.
http://dx.doi.org/10.1016/j.physbeh.2009.11.017
---------- CHICAGO ----------
Fiszbein, A., Cánepa, M., Vázquez, G.R., Maggese, C., Pandolfi, M. "Photoperiodic modulation of reproductive physiology and behaviour in the cichlid fish Cichlasoma dimerus" . Physiology and Behavior 99, no. 4 (2010) : 425-432.
http://dx.doi.org/10.1016/j.physbeh.2009.11.017
---------- MLA ----------
Fiszbein, A., Cánepa, M., Vázquez, G.R., Maggese, C., Pandolfi, M. "Photoperiodic modulation of reproductive physiology and behaviour in the cichlid fish Cichlasoma dimerus" . Physiology and Behavior, vol. 99, no. 4, 2010, pp. 425-432.
http://dx.doi.org/10.1016/j.physbeh.2009.11.017
---------- VANCOUVER ----------
Fiszbein, A., Cánepa, M., Vázquez, G.R., Maggese, C., Pandolfi, M. Photoperiodic modulation of reproductive physiology and behaviour in the cichlid fish Cichlasoma dimerus. Physiol. Behav. 2010;99(4):425-432.
http://dx.doi.org/10.1016/j.physbeh.2009.11.017