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Abstract:

Social animals with hierarchal dominance systems are particularly susceptible to their social environment. There, interactions with conspecifics and hierarchal position can greatly affect an individual's behavior, physiology and reproductive success. Our experimental model, Cichlasoma dimerus, is a serially-monogamous Neotropical cichlid fish with a hierarchical social system, established and sustained through agonistic interactions. In this work, we aimed to describe C. dimerus social structure and its association with hormonal profiles and testicular cellular composition. We recorded and quantified agonistic interactions from the territorial pair, i.e. the top ranked male and female, and the lowest ranked male of stable social groups. Plasma levels of 11-ketotestosterone (11-KT), testosterone, 17β-estradiol (E 2 ) and cortisol were measured by ELISA. Results show that territorial pairs cooperatively guarded the territory, but rarely attacked in synchrony. Territorial males had higher testosterone and 11-KT plasma levels than non-territorial males, while E 2 and an index of its metabolization from testosterone were higher in non-territorial males. No difference was observed in cortisol levels. Plasma 11-KT and an index of the conversion of testosterone to 11-KT, positively correlated with the frequency of aggressiveness, while E 2 showed the opposite pattern. Territorial males had a higher gonadosomatic index than non-territorial males. The quantification of testicular cellular types revealed that the percentage of spermatocytes and spermatids was higher in non-territorial males, while territorial males showed a greater percentage of spermatozoa. Thus, C. dimerus male social position within a stable hierarchy is associated with distinct behaviors, steroid levels and testicular degree of development. © 2015 Elsevier Inc.

Registro:

Documento: Artículo
Título:A multidisciplinary study on social status and the relationship between inter-individual variation in hormone levels and agonistic behavior in a Neotropical cichlid fish
Autor:Ramallo, M.R.; Birba, A.; Honji, R.M.; Morandini, L.; Moreira, R.G.; Somoza, G.M.; Pandolfi, M.
Filiación:Instituto de Biodiversidad y Biología Experimental y Aplicada - CONICET, Ciudad Autónoma de Buenos Aires, Argentina
Laboratorio de Neuroendocrinología y Comportamiento, Departamento de Biodiversidad y Biologia Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina
Departamento de Fisiologia, Instituto de Biociências, Universidade de São Paulo, Rua do Matão, Trav. 14 n321, Cidade Univ., São Paulo, 05508-090, Brazil
Laboratorio de Ictiofisiología y Acuicultura, Instituto de Investigaciones Biotecnológicas, Instituto Tecnológico de Chascomús (IIB-INTECH. CONICET-UNSAM), Chascomús, Argentina
Palabras clave:17β-Estradiol; Aggression; Agonistic behavior; Androgens; Cichlasoma dimerus; Cichlids; Cooperative behavior; Cortisol; 11 oxotestosterone; estradiol; hydrocortisone; testosterone; 11-ketotestosterone; estradiol; hydrocortisone; testosterone; adult; aggression; animal behavior; animal cell; animal experiment; animal tissue; Article; cell composition; Cichlasoma dimerus; cichlid; controlled study; cooperation; coping behavior; female; hormone blood level; hormone determination; hormone metabolism; male; nonhuman; organism social group; passive avoidance; sex difference; social dominance; social interaction; social status; social structure; spermatid; spermatocyte; spermatozoon; territoriality; analogs and derivatives; animal; blood; individuality; physiology; reproduction; social dominance; social environment; Aggression; Aggression; Agonistic Behavior; Agonistic Behavior; Animals; Animals; Cichlids; Cichlids; Estradiol; Estradiol; Female; Female; Hierarchy, Social; Hierarchy, Social; Hydrocortisone; Hydrocortisone; Individuality; Individuality; Male; Male; Reproduction; Reproduction; Social Environment; Social Environment; Territoriality; Territoriality; Testosterone; Testosterone
Año:2015
Volumen:69
Página de inicio:139
Página de fin:151
DOI: http://dx.doi.org/10.1016/j.yhbeh.2015.01.008
Título revista:Hormones and Behavior
Título revista abreviado:Horm. Behav.
ISSN:0018506X
CODEN:HOBEA
CAS:11 oxotestosterone, 564-35-2; estradiol, 50-28-2; hydrocortisone, 50-23-7; testosterone, 58-22-0; 11-ketotestosterone; Estradiol; Hydrocortisone; Testosterone
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0018506X_v69_n_p139_Ramallo

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Citas:

---------- APA ----------
Ramallo, M.R., Birba, A., Honji, R.M., Morandini, L., Moreira, R.G., Somoza, G.M. & Pandolfi, M. (2015) . A multidisciplinary study on social status and the relationship between inter-individual variation in hormone levels and agonistic behavior in a Neotropical cichlid fish. Hormones and Behavior, 69, 139-151.
http://dx.doi.org/10.1016/j.yhbeh.2015.01.008
---------- CHICAGO ----------
Ramallo, M.R., Birba, A., Honji, R.M., Morandini, L., Moreira, R.G., Somoza, G.M., et al. "A multidisciplinary study on social status and the relationship between inter-individual variation in hormone levels and agonistic behavior in a Neotropical cichlid fish" . Hormones and Behavior 69 (2015) : 139-151.
http://dx.doi.org/10.1016/j.yhbeh.2015.01.008
---------- MLA ----------
Ramallo, M.R., Birba, A., Honji, R.M., Morandini, L., Moreira, R.G., Somoza, G.M., et al. "A multidisciplinary study on social status and the relationship between inter-individual variation in hormone levels and agonistic behavior in a Neotropical cichlid fish" . Hormones and Behavior, vol. 69, 2015, pp. 139-151.
http://dx.doi.org/10.1016/j.yhbeh.2015.01.008
---------- VANCOUVER ----------
Ramallo, M.R., Birba, A., Honji, R.M., Morandini, L., Moreira, R.G., Somoza, G.M., et al. A multidisciplinary study on social status and the relationship between inter-individual variation in hormone levels and agonistic behavior in a Neotropical cichlid fish. Horm. Behav. 2015;69:139-151.
http://dx.doi.org/10.1016/j.yhbeh.2015.01.008