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1. Can estrogens be considered as key elements of the challenge hypothesis? The case of intrasexual aggression in a cichlid fish

Author:
Somoza, Gustavo Manuel,   et al.   ; Scaia, María Florencia; Morandini, Leonel; Noguera, CristobalAlejandro; Trudeau, Vance L.; Pandolfi, Matías;     Show all 6 Authors
Source:
Physiology & behavior 2018 v.194 pp. 481-490
ISSN:
0031-9384
Subject:
Cichlasoma dimerus; aggression; aromatization; estrogens; females; males; physiological regulation; testosterone
Abstract:
... Territorial aggression has been widely studied in males and it has been historically suggested that androgens are key mediators of this behavior. However, more recent evidence suggests that it is the aromatization to estrogens, rather than androgens themselves, that is key to regulating this behavior. Females also display aggressive behaviors, but the physiological regulation of female aggression ...
DOI:
10.1016/j.physbeh.2018.06.028

2. Fighting cichlids: Dynamic of intrasexual aggression in dyadic agonistic encounters

Author:
Somoza, Gustavo Manuel,   et al.   ; Scaia, María Florencia; Morandini, Leonel; Noguera, Cristobal Alejandro; Ramallo, Martín Roberto; Pandolfi, Matías;     Show all 6 Authors
Source:
Behavioural processes 2018 v.147 pp. 61-69
ISSN:
0376-6357
Subject:
Cichlasoma dimerus; aggression; conflict management; females; fish; males; motivation
Abstract:
... Aggression is an extremely complex behaviour and female aggression is understudied when compared to males. Despite the fact that it has been suggested that conflict among females may be more frequently resolved peacefully, in many species females show high levels of aggression. We used Cichlasoma dimerus to describe dynamics and conflict outcome in intrasexual agonistic encounters. We performed en ...
DOI:
10.1016/j.beproc.2017.12.015

3. Intersex and liver alterations induced by long‐term sublethal exposure to 17α‐ethinylestradiol in adult male Cnesterodon decemmaculatus (Pisces: Poeciliidae)

Author:
Somoza, Gustavo Manuel,   et al.   ; Young, Brian Jonathan; López, Gabriela Carina; Cristos, Diego Sebastián; Crespo, Diana Cristina; Carriquiriborde, Pedro;     Show all 6 Authors
Source:
Environmental toxicology and chemistry 2017 v.36 no.7 pp. 1738-1745
ISSN:
0730-7268
Subject:
Cnesterodon decemmaculatus; adults; chronic exposure; fish; histology; liver; males; necrosis; oocytes; secretion; streams; testes
Abstract:
... The aim of the present study was to assess the responses of the gonopodium morphology and the gonadal and liver histology of adult male Cnesterodon decemmaculatus to sublethal long‐term exposure concentrations of 17α‐ethinylestradiol (EE2). Two experiments were conducted exposing the fish to waterborne concentrations of EE2 ranging from 20 ng/L to 200 ng/L for 8 wk, 12 wk, and 16 wk. Intersex gona ...
DOI:
10.1002/etc.3547

4. Effect on the growth and development and induction of abnormalities by a glyphosate commercial formulation and its active ingredient during two developmental stages of the South-American Creole frog, Leptodactylus latrans

Author:
Somoza, Gustavo Manuel,   et al.   ; Bach, Nadia Carla; Natale, Guillermo Sebastián; Ronco, Alicia Estela;     Show all 4 Authors
Source:
Environmental science and pollution research international 2016 v.23 no.23 pp. 23959-23971
ISSN:
0944-1344
Subject:
Leptodactylus; active ingredients; agroecosystems; bioassays; exposure duration; frogs; glyphosate; larvae; mortality; mouthparts; sublethal effects; swimming; Argentina
Abstract:
... We evaluated the acute lethal and sublethal effects of technical-grade glyphosate (GLY) and the GLY-based commercial formulation Roundup ULTRA MAX® (RU) on two Gosner stages (Gss) 25 and 36 of the South-American Creole frog, Leptodactylus latrans. Bioassays were performed following standardized methods within a wide range of concentrations (0.0007–9.62 mg of acid equivalents per liter—a.e./L—of RU ...
DOI:
10.1007/s11356-016-7631-z

5. Presence of 11-ketotestosterone in pre-differentiated male gonads of Odontesthes bonariensis

Author:
Somoza, Gustavo Manuel,   et al.   ; Blasco, Martín; Vizziano-Cantonnet, Denise;     Show all 3 Authors
Source:
Fish physiology and biochemistry 2013 v.39 no.1 pp. 71-74
ISSN:
0920-1742
Subject:
androgens; enzyme activity; gonads; high performance liquid chromatography; histology; larvae; peritoneum; sexual development; temperature; thin layer chromatography
Abstract:
... The involvement of androgens during sex differentiation period was investigated in the pejerrey Odontesthes bonariensis, by classic biochemical studies and gonadal histology. We studied in particular whether the enzyme activities involved in 11-oxygenated androgen production were active in a gonadal/peritoneum complex (GPC) of very small larvae exposed to masculinizing temperatures previous to mor ...
DOI:
10.1007/s10695-012-9651-z
PubMed:
22580925

6. Screening Concentration of E1, E2 and EE2 in Sewage Effluents and Surface Waters of the “Pampas” Region and the “Río de la Plata” Estuary (Argentina)

Author:
Somoza, Gustavo Manuel,   et al.   ; Valdés, María Eugenia; Marino, Damián José; Wunderlin, Daniel Alberto; Ronco, Alicia Estela; Carriquiriborde, Pedro;     Show all 6 Authors
Source:
Bulletin of environmental contamination and toxicology 2015 v.94 no.1 pp. 29-33
ISSN:
0007-4861
Subject:
estradiol; estrone; estuaries; risk; screening; sewage; sewage effluent; streams; surface water; water supply; Argentina
Abstract:
... Concentrations of estrone (E1), 17β-estradiol (E2) and 17α-ethinylestradiol (EE2) were investigated for the first time in sewage effluents and receiving waters of the “Río de la Plata” estuary and neighboring areas by means of LC–MS/MS. E2 and EE2 were ubiquitous in the evaluated sewage effluent samples showing concentrations ranging between 122–631 and 65–187 ng/L, respectively. In surface waters ...
DOI:
10.1007/s00128-014-1417-0